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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative, Fair Value, Net [Abstract]      
Derivative assets, gross amount $ 2,869   $ 3,415
Derivative liabilities, gross amount 1,651   1,518
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 (2) $ (52)  
Derivative, Fair Value, Net [Abstract]      
Beginning balance 31 26  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (21) 20  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0  
Purchases 0 0  
Sales 0 0  
Issuances 38 24  
Settlements (14) (2)  
Transfers Into Level 3 0 0  
Transfers Out of Level 3 0 (2)  
Ending balance 34 66  
Derivative assets, gross amount 157 147 141
Derivative liabilities, gross amount 123 81 $ 110
RMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 328 433  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 7 3  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 2 (53)  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (26) (17)  
Transfers Into Level 3 39 9  
Transfers Out of Level 3 (24) (2)  
Ending balance 326 373  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 7 3  
CMBS | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 111 13  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (2) 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (6) (1)  
Transfers Into Level 3 0 24  
Transfers Out of Level 3 (93) 0  
Ending balance 10 36  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 0  
Available-for-sale securities | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 439 446  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 7 3  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 (53)  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (32) (18)  
Transfers Into Level 3 39 33  
Transfers Out of Level 3 (117) (2)  
Ending balance 336 409  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 7 3  
Retained interest in securitizations | Recurring | Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 55 66  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (5) (7)  
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 50 59  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (5) (7)  
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 $ (19) $ 18