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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 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 $ 2,649   $ 2,675
Derivative liabilities, gross amount 2,934   2,932
Recurring | Level 3      
Derivative, Fair Value, Net [Abstract]      
Beginning balance 58    
Ending balance 54    
Net unrealized gains (losses) included in OCI related to assets and liabilities still held (8) $ (8)  
Derivative assets, gross amount 974 837 886
Derivative liabilities, gross amount 920 819 $ 828
Total RMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 146 236  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 2 1  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 3  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (3) (5)  
Transfers Into Level 3 182 34  
Transfers Out of Level 3 (18) (22)  
Ending balance 309 247  
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 132 142  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (2) 5  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (1) (2)  
Transfers Into Level 3 0 0  
Transfers Out of Level 3 0 0  
Ending balance 129 145  
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 278 378  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 2 1  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (2) 8  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (4) (7)  
Transfers Into Level 3 182 34  
Transfers Out of Level 3 (18) (22)  
Ending balance 438 392  
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 35 36  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 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 35 36  
Derivative, Fair Value, Net [Abstract]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 0  
Net derivative assets (liabilities) | Recurring | Level 3      
Derivative, Fair Value, Net [Abstract]      
Beginning balance 58 5  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 6 (5)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0  
Purchases 0 0  
Sales 0 0  
Issuances (5) 104  
Settlements (5) 12  
Transfers Into Level 3 0 (97)  
Transfers Out of Level 3 0 (1)  
Ending balance 54 18  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ (1) $ 4