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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Derivative, Fair Value, Net [Abstract]        
Fair value of RMBS, cumulative effects from the CECL adoption       $ 4
Derivative assets, gross amount $ 2,690 $ 3,415    
Derivative liabilities, gross amount 1,868 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 (4) (21) $ (4)  
Derivative, Fair Value, Net [Abstract]        
Beginning balance 31 26 (10)  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (43) 10 6  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0  
Purchases 0 0 0  
Sales 0 0 0  
Issuances 68 43 (16)  
Settlements (37) (37) 52  
Transfers Into Level 3 6 0 0  
Transfers Out of Level 3 (6) (11) (6)  
Ending balance 19 31 26  
Derivative assets, gross amount 84 141 77  
Derivative liabilities, gross amount 65 110 51  
RMBS | Recurring | Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 328 429 433  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 18 22 35  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 5 (19) 5  
Purchases 0 0 0  
Sales 0 0 0  
Issuances 0 0 0  
Settlements (91) (72) (63)  
Transfers Into Level 3 106 206 177  
Transfers Out of Level 3 (108) (242) (158)  
Ending balance 258 328 429  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 15 16 34  
RMBS | Recurring | Level 3 | including CECL Impact Adoption        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance   433    
Ending balance     433  
CMBS | Recurring | Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 111 13 10  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 (3) 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (2) (9) 0  
Purchases 0 0 0  
Sales 0 0 0  
Issuances 0 0 0  
Settlements (7) (32) (2)  
Transfers Into Level 3 0 371 5  
Transfers Out of Level 3 (93) (229) 0  
Ending balance 9 111 13  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 0 0  
Available-for-sale securities | Recurring | Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 439 442 443  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 18 19 35  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 3 (28) 5  
Purchases 0 0 0  
Sales 0 0 0  
Issuances 0 0 0  
Settlements (98) (104) (65)  
Transfers Into Level 3 106 577 182  
Transfers Out of Level 3 (201) (471) (158)  
Ending balance 267 439 442  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 15 16 34  
Available-for-sale securities | Recurring | Level 3 | including CECL Impact Adoption        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance   446    
Ending balance     446  
Retained interest in securitizations | Recurring | Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 55 66 158  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (14) (11) 18  
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 (110)  
Transfers Into Level 3 0 0 0  
Transfers Out of Level 3 0 0 0  
Ending balance 41 55 66  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (14) (11) (19)  
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 $ (20) $ 10 $ 1