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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
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    
Derivative, Fair Value, Net [Abstract]      
Derivative assets, gross amount $ 2,652   $ 3,098
Derivative liabilities, gross amount 3,200   4,550
Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net Unrealized Gains (Losses) Included in OCI Related to Assets and Liabilities Still Held (8) $ (7)  
Derivative, Fair Value, Net [Abstract]      
Beginning balance 5 19  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (5) 5  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0  
Purchases 0 0  
Sales 0 0  
Issuances 104 28  
Settlements 12 (2)  
Transfers Into Level 3 (97) (28)  
Transfers Out of Level 3 (1) 0  
Ending balance 18 22  
Derivative assets, gross amount 837 202 79
Derivative liabilities, gross amount 819 180 $ 74
RMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 236 258  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 1 10  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 3 (12)  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (5) (28)  
Transfers Into Level 3 34 12  
Transfers Out of Level 3 (22) (29)  
Ending balance 247 211  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 3  
CMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 142 9  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 5 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (2) (1)  
Transfers Into Level 3 0 13  
Transfers Out of Level 3 0 0  
Ending balance 145 21  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 (1)  
Available-for-sale securities | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 378 267  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 1 10  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 8 (12)  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (7) (29)  
Transfers Into Level 3 34 25  
Transfers Out of Level 3 (22) (29)  
Ending balance 392 232  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 2  
Retained interest in securitizations | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 36 41  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 (2)  
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 36 39  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 (2)  
Net derivative assets (liabilities) | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held $ 4 $ 1