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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
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 $ 2,408   $ 2,408   $ 2,675
Derivative liabilities, gross amount 2,657   2,657   2,932
Recurring | Level 3          
Derivative, Fair Value, Net [Abstract]          
Beginning balance     58    
Ending balance 45   45    
Net unrealized gains (losses) included in OCI related to assets and liabilities still held (2) $ (9) (2) $ (14)  
Derivative assets, gross amount 613 1,300 613 1,300 886
Derivative liabilities, gross amount 568 1,300 568 1,300 $ 828
Total RMBS | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 304 206 146 236  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 2 2 6 6  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 11 (5) 8 (4)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (4) (6) (9) (17)  
Transfers Into Level 3 2 2 187 47  
Transfers Out of Level 3 (135) (50) (158) (119)  
Ending balance 180 149 180 149  
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 2 133 132 142  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0 0 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 (6) (3) (12)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 (1) (3) (4)  
Transfers Into Level 3 0 0 0 0  
Transfers Out of Level 3 0 0 (124) 0  
Ending balance 2 126 2 126  
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 306 339 278 378  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 2 2 6 6  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 11 (11) 5 (16)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (4) (7) (12) (21)  
Transfers Into Level 3 2 2 187 47  
Transfers Out of Level 3 (135) (50) (282) (119)  
Ending balance 182 275 182 275  
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 34 36 35 36  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 (1) (1) (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 34 35 34 35  
Derivative, Fair Value, Net [Abstract]          
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 (1) (1) (1)  
Net derivative assets (liabilities) | Recurring | Level 3          
Derivative, Fair Value, Net [Abstract]          
Beginning balance 69 64 58 5  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (20) (2) (17) (20)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0 0  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 4 3 1 176  
Settlements (8) 18 3 75  
Transfers Into Level 3 0 (15) 0 (167)  
Transfers Out of Level 3 0 0 0 (1)  
Ending balance 45 68 45 68  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ (15) $ 4 $ (18) $ 71