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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Derivative, Fair Value, Net [Abstract]        
Derivative assets, gross amount $ 3,098 $ 2,690    
Derivative liabilities, gross amount $ 4,550 1,868    
Fair Value, RMBS, Cumulative Effects from the Adoption of the CECL Standard       $ 4
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      
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 $ (57) (4) $ (21)  
Derivative, Fair Value, Net [Abstract]        
Beginning balance 19 31 26  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (65) (43) 10  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0  
Purchases 0 0 0  
Sales 0 0 0  
Issuances 36 68 43  
Settlements 3 (37) (37)  
Transfers Into Level 3 (28) 6 0  
Transfers Out of Level 3 40 (6) (11)  
Ending balance 5 19 31  
Derivative assets, gross amount 79 84 141  
Derivative liabilities, gross amount 74 65 110  
RMBS | Recurring | Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 258 328 433  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 18 18 22  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (32) 5 (19)  
Purchases 0 0 0  
Sales 0 0 0  
Issuances 0 0 0  
Settlements (60) (91) (72)  
Transfers Into Level 3 123 106 206  
Transfers Out of Level 3 (71) (108) (242)  
Ending balance 236 258 328  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 10 15 16  
CMBS | Recurring | Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 9 111 13  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (1) 0 (3)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (3) (2) (9)  
Purchases 0 0 0  
Sales 0 0 0  
Issuances 0 0 0  
Settlements (15) (7) (32)  
Transfers Into Level 3 190 0 371  
Transfers Out of Level 3 (38) (93) (229)  
Ending balance 142 9 111  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (1) 0 0  
Available-for-sale securities | Recurring | Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 267 439 446  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 17 18 19  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (35) 3 (28)  
Purchases 0 0 0  
Sales 0 0 0  
Issuances 0 0 0  
Settlements (75) (98) (104)  
Transfers Into Level 3 313 106 577  
Transfers Out of Level 3 (109) (201) (471)  
Ending balance 378 267 439  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 9 15 16  
Retained interest in securitizations | Recurring | Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 41 55 66  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (5) (14) (11)  
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 0  
Transfers Into Level 3 0 0 0  
Transfers Out of Level 3 0 0 0  
Ending balance 36 41 55  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (5) (14) (11)  
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 $ (33) $ (20) $ 10