| Name
                                
                                
                                
                                
                                    DC College Savings 2043 Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    14.49% | 3 year average annual returns as of 09/30/2025
                                
                                
                                — | 5 year average annual returns as of 09/30/2025
                                
                                
                                — | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    17.97% | Inception date
                                
                                07/07/2023 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    DC College Savings 2040 Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    13.29% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    19.56% | 5 year average annual returns as of 09/30/2025
                                
                                
                                — | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    7.11% | Inception date
                                
                                11/19/2021 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    DC College Savings 2037 Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    11.96% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    17.14% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    10.10% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    9.57% | Inception date
                                
                                09/06/2019 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    DC College Savings 2034 Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    10.12% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    14.52% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    8.24% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    8.14% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    DC College Savings 2031 Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    8.15% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    11.85% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    6.43% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    6.80% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    DC College Savings 2028 Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    6.05% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    8.93% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    4.55% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    5.35% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    DC College Savings In College Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    4.34% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    4.97% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    3.12% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    3.12% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    U.S. Intermediate-Term Bond Index Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    2.63% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    4.61% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    -0.64% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    1.45% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    Intermediate-Term Bond Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    3.10% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    5.23% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    -0.13% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    2.14% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    U.S. Total Stock Market Index Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    17.04% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    23.73% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    15.03% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    13.74% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    U.S. Socially Responsible Equity Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    15.12% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    23.73% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    16.05% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    14.30% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    U.S. Large Cap Equity Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    15.13% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    23.87% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    16.18% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    15.24% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    Non-U.S. Socially Responsible Equity Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    17.46% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    22.58% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    10.86% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    8.29% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    Non-U.S. Total Stock Market Index Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    16.91% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    20.27% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    9.91% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    7.46% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    U.S. Small Cap Equity Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    12.30% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    19.98% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    17.53% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    10.23% | Inception date
                                
                                03/24/2017 | 
                    
                        
                        
                            | Name
                                
                                
                                
                                
                                    Principal Protected Portfolio | 1 year returns as of 09/30/2025
                                
                                
                                    2.87% | 3 year average annual returns as of 09/30/2025
                                
                                
                                    2.65% | 5 year average annual returns as of 09/30/2025
                                
                                
                                    2.42% | 10 year average annual returns as of 09/30/2025
                                
                                
                                — | Since inception average annual returns as of 09/30/2025*
                                
                                
                                    2.33% | Inception date
                                
                                03/24/2017 |