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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Derivative, Fair Value, Net [Abstract]      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent    
Derivative assets, gross amount $ 2,255   $ 2,232
Derivative liabilities, gross amount 2,230   2,032
Recurring | Level 3      
Derivative, Fair Value, Net [Abstract]      
Beginning balance 69    
Ending balance 89    
Net unrealized gains (losses) included in OCI related to assets and liabilities still held 4 $ (8)  
Derivative assets, gross amount 570 974 683
Derivative liabilities, gross amount 481 920 $ 614
Total RMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 116 146  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 2 2  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 3 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (3) (3)  
Transfers Into Level 3 25 182  
Transfers Out of Level 3 0 (18)  
Ending balance 143 309  
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 2  
CMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 2 132  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 (2)  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 (1)  
Transfers Into Level 3 0 0  
Transfers Out of Level 3 0 0  
Ending balance 2 129  
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 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 118 278  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 2 2  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 3 (2)  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (3) (4)  
Transfers Into Level 3 25 182  
Transfers Out of Level 3 0 (18)  
Ending balance 145 438  
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 2  
Retained interests in securitizations | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 34 35  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (2) 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 0  
Transfers Into Level 3 0 0  
Transfers Out of Level 3 0 0  
Ending balance 32 35  
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (2) 0  
Net derivative assets (liabilities) | Recurring | Level 3      
Derivative, Fair Value, Net [Abstract]      
Beginning balance 69 58  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 13 6  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0  
Purchases 0 0  
Sales 0 0  
Issuances 14 (5)  
Settlements (7) (5)  
Transfers Into Level 3 0 0  
Transfers Out of Level 3 0 0  
Ending balance 89 54  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ 11 $ (1)