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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 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 $ 2,745   $ 2,745   $ 3,098
Derivative liabilities, gross amount 3,556   3,556   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 (13) $ (11) (5) $ (20)  
Derivative, Fair Value, Net [Abstract]          
Beginning balance 18 22 5 19  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (13) (46) (18) (41)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0 0  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 69 8 173 36  
Settlements 45 4 57 2  
Transfers Into Level 3 (55) 0 (152) (28)  
Transfers Out of Level 3 0 0 (1) 0  
Ending balance 64 (12) 64 (12)  
Derivative assets, gross amount 1,212 131 1,212 131 79
Derivative liabilities, gross amount 1,148 143 1,148 143 $ 74
RMBS | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 247 211 236 258  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 3 3 4 13  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (2) (8) 1 (20)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (6) (15) (11) (43)  
Transfers Into Level 3 11 72 45 84  
Transfers Out of Level 3 (47) (23) (69) (52)  
Ending balance 206 240 206 240  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 2 4 5  
CMBS | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 145 21 142 9  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 0 0 0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (11) (1) (6) (1)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (1) (4) (3) (5)  
Transfers Into Level 3 0 0 0 13  
Transfers Out of Level 3 0 (3) 0 (3)  
Ending balance 133 13 133 13  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 0 0 (1)  
Available-for-sale securities | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 392 232 378 267  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 3 3 4 13  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (13) (9) (5) (21)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (7) (19) (14) (48)  
Transfers Into Level 3 11 72 45 97  
Transfers Out of Level 3 (47) (26) (69) (55)  
Ending balance 339 253 339 253  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2 2 4 4  
Retained interest in securitizations | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 36 39 36 41  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0 (2) 0 (4)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0 0 0 0  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Transfers Into Level 3 0 0 0 0  
Transfers Out of Level 3 0 0 0 0  
Ending balance 36 37 36 37  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0 (2) 0 (4)  
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 $ 6 $ (18) $ 51 $ (38)