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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 $ 2,675 $ 3,098  
Derivative liabilities, gross amount 2,932 4,550  
Recurring | Level 3      
Derivative, Fair Value, Net [Abstract]      
Beginning balance 5    
Ending balance 58 5  
Net unrealized gains (losses) included in OCI related to assets and liabilities still held (5) 57 $ 4
Derivative assets, gross amount 886 79 84
Derivative liabilities, gross amount 828 74 65
Total RMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 236 258 328
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 8 18 18
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (2) (32) 5
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements (20) (60) (91)
Transfers Into Level 3 49 123 106
Transfers Out of Level 3 (125) (71) (108)
Ending balance 146 236 258
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 7 10 15
CMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 142 9 111
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (1) (1) 0
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (4) (3) (2)
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements (5) (15) (7)
Transfers Into Level 3 0 190 0
Transfers Out of Level 3 0 (38) (93)
Ending balance 132 142 9
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (1) (1) 0
Securities Available for Sale | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 378 267 439
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 7 17 18
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (6) (35) 3
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements (25) (75) (98)
Transfers Into Level 3 49 313 106
Transfers Out of Level 3 (125) (109) (201)
Ending balance 278 378 267
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 6 9 15
Retained interests in securitizations | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 36 41 55
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (1) (5) (14)
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements 0 0 0
Transfers Into Level 3 0 0 0
Transfers Out of Level 3 0 0 0
Ending balance 35 36 41
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (1) (5) (14)
Net derivative assets (liabilities) | Recurring | Level 3      
Derivative, Fair Value, Net [Abstract]      
Beginning balance 5 19 31
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (14) (65) (43)
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issuances 166 36 68
Settlements 69 3 (37)
Transfers Into Level 3 (167) (28) 6
Transfers Out of Level 3 (1) 40 (6)
Ending balance 58 5 19
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ 63 $ (33) $ (20)