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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Derivative, Fair Value, Net [Abstract]          
Derivative assets, gross amount $ 2,125   $ 2,125   $ 2,232
Derivative liabilities, gross amount 1,971   1,971   2,032
Recurring | Level 3          
Derivative, Fair Value, Net [Abstract]          
Beginning balance     69    
Ending balance 108   108    
Net unrealized gains (losses) included in OCI related to assets and liabilities still held 0 $ (2) 6 $ (2)  
Derivative assets, gross amount 478 613 478 613 683
Derivative liabilities, gross amount 370 568 370 568 $ 614
Total RMBS | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 142 304 116 146  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 1 2 5 6  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 11 3 8  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (2) (4) (9) (9)  
Transfers Into Level 3 6 2 32 187  
Transfers Out of Level 3 (21) (135) (21) (158)  
Ending balance 126 180 126 180  
Derivative, Fair Value, Net [Abstract]          
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 2 5 5  
CMBS | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 0 2 2 132  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0 0 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0 (3)  
Purchases 0 0 0 0  
Sales 0 0 (1) 0  
Issuances 0 0 0 0  
Settlements 0 0 (1) (3)  
Transfers Into Level 3 0 0 0 0  
Transfers Out of Level 3 0 0 0 (124)  
Ending balance 0 2 0 2  
Derivative, Fair Value, Net [Abstract]          
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 0 0 0  
Total securities available for sale | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 142 306 118 278  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 1 2 5 6  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 11 3 5  
Purchases 0 0 0 0  
Sales 0 0 (1) 0  
Issuances 0 0 0 0  
Settlements (2) (4) (10) (12)  
Transfers Into Level 3 6 2 32 187  
Transfers Out of Level 3 (21) (135) (21) (282)  
Ending balance 126 182 126 182  
Derivative, Fair Value, Net [Abstract]          
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 2 5 5  
Retained interests in securitizations | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 29 34 34 35  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0 (5) (1)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0 0  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Transfers Into Level 3 0 0 0 0  
Transfers Out of Level 3 0 0 0 0  
Ending balance 29 34 29 34  
Derivative, Fair Value, Net [Abstract]          
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 0 (5) (1)  
Net derivative assets (liabilities) | Recurring | Level 3          
Derivative, Fair Value, Net [Abstract]          
Beginning balance 108 69 69 58  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (5) (20) 11 (17)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0 0  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 9 4 33 1  
Settlements (4) (8) (5) 3  
Transfers Into Level 3 0 0 0 0  
Transfers Out of Level 3 0 0 0 0  
Ending balance 108 45 108 45  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ (7) $ (15) $ 7 $ (18)