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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Derivative, Fair Value, Net [Abstract]      
Derivative assets, gross amount $ 4,519   $ 2,690
Derivative liabilities, gross amount 4,853   1,868
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 (7) $ (2)  
Derivative, Fair Value, Net [Abstract]      
Beginning balance 19 31  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 5 (21)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0  
Purchases 0 0  
Sales 0 0  
Issuances 28 38  
Settlements (2) (14)  
Transfers Into Level 3 (28) 0  
Transfers Out of Level 3 0 0  
Ending balance 22 34  
Derivative assets, gross amount 202 157 84
Derivative liabilities, gross amount 180 123 $ 65
RMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 258 328  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 10 7  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (12) 2  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (28) (26)  
Transfers Into Level 3 12 39  
Transfers Out of Level 3 (29) (24)  
Ending balance 211 326  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 3 7  
CMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 9 111  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 (2)  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (1) (6)  
Transfers Into Level 3 13 0  
Transfers Out of Level 3 0 (93)  
Ending balance 21 10  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (1) 0  
Available-for-sale securities | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 267 439  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 10 7  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (12) 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (29) (32)  
Transfers Into Level 3 25 39  
Transfers Out of Level 3 (29) (117)  
Ending balance 232 336  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 7  
Retained interest in securitizations | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 41 55  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (2) (5)  
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 39 50  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (2) (5)  
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 $ 1 $ (19)