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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 $ 2,232 $ 2,675  
Derivative liabilities, gross amount 2,032 2,932  
Recurring | Level 3      
Derivative, Fair Value, Net [Abstract]      
Beginning balance 58    
Ending balance 69 58  
Net unrealized gains (losses) included in OCI related to assets and liabilities still held (10) (5) $ (57)
Derivative assets, gross amount 683 886 79
Derivative liabilities, gross amount 614 828 74
Total RMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 146 236 258
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 6 8 18
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (2) (2) (32)
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements (11) (20) (60)
Transfers Into Level 3 193 49 123
Transfers Out of Level 3 (216) (125) (71)
Ending balance 116 146 236
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 6 7 10
CMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 132 142 9
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 (1) (1)
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (3) (4) (3)
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements (3) (5) (15)
Transfers Into Level 3 0 0 190
Transfers Out of Level 3 (124) 0 (38)
Ending balance 2 132 142
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 (1) (1)
Total securities available for sale | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 278 378 267
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 6 7 17
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (5) (6) (35)
Purchases 0 0 0
Sales 0 0 0
Issuances 0 0 0
Settlements (14) (25) (75)
Transfers Into Level 3 193 49 313
Transfers Out of Level 3 (340) (125) (109)
Ending balance 118 278 378
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 6 6 9
Retained interests in securitizations | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 35 36 41
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (1) (1) (5)
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 34 35 36
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (1) (1) (5)
Net derivative assets (liabilities) | Recurring | Level 3      
Derivative, Fair Value, Net [Abstract]      
Beginning balance 58 5 19
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (15) (14) (65)
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issuances 12 166 36
Settlements 16 69 3
Transfers Into Level 3 (2) (167) (28)
Transfers Out of Level 3 0 (1) 40
Ending balance 69 58 5
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ (25) $ 63 $ (33)