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Fair Value Measurement - Level 3 Recurring Fair Value Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 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 $ 3,381.0   $ 3,381.0   $ 3,098.0
Derivative liabilities, gross amount 3,699.0   3,699.0   4,550.0
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 (9.0) $ (15.0) (14.0) $ (53.0)  
Derivative, Fair Value, Net [Abstract]          
Beginning balance 64.0 (12.0) 5.0 19.0  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (2.0) (22.0) (20.0) (63.0)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0.0 0.0 0.0 0.0  
Purchases 0.0 0.0 0.0 0.0  
Sales 0.0 0.0 0.0 0.0  
Issuances 3.0 (11.0) 176.0 25.0  
Settlements 18.0 0.0 75.0 2.0  
Transfers Into Level 3 (15.0) 0.0 (167.0) (28.0)  
Transfers Out of Level 3 0.0 40.0 (1.0) 40.0  
Ending balance 68.0 (5.0) 68.0 (5.0)  
Derivative assets, gross amount 1,323.0 110.0 1,323.0 110.0 79.0
Derivative liabilities, gross amount 1,255.0 115.0 1,255.0 115.0 $ 74.0
RMBS | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 206.0 240.0 236.0 258.0  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 2.0 2.0 6.0 15.0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (5.0) (9.0) (4.0) (29.0)  
Purchases 0.0 0.0 0.0 0.0  
Sales 0.0 0.0 0.0 0.0  
Issuances 0.0 0.0 0.0 0.0  
Settlements (6.0) (10.0) (17.0) (53.0)  
Transfers Into Level 3 2.0 8.0 47.0 92.0  
Transfers Out of Level 3 (50.0) (13.0) (119.0) (65.0)  
Ending balance 149.0 218.0 149.0 218.0  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2.0 2.0 5.0 6.0  
CMBS | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 133.0 13.0 142.0 9.0  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 0.0 (1.0) 0.0 (1.0)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (6.0) (1.0) (12.0) (2.0)  
Purchases 0.0 0.0 0.0 0.0  
Sales 0.0 0.0 0.0 0.0  
Issuances 0.0 0.0 0.0 0.0  
Settlements (1.0) (8.0) (4.0) (13.0)  
Transfers Into Level 3 0.0 177.0 0.0 190.0  
Transfers Out of Level 3 0.0 0.0 0.0 (3.0)  
Ending balance 126.0 180.0 126.0 180.0  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 0.0 0.0 0.0 (1.0)  
Available-for-sale securities | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 339.0 253.0 378.0 267.0  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income 2.0 1.0 6.0 14.0  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI (11.0) (10.0) (16.0) (31.0)  
Purchases 0.0 0.0 0.0 0.0  
Sales 0.0 0.0 0.0 0.0  
Issuances 0.0 0.0 0.0 0.0  
Settlements (7.0) (18.0) (21.0) (66.0)  
Transfers Into Level 3 2.0 185.0 47.0 282.0  
Transfers Out of Level 3 (50.0) (13.0) (119.0) (68.0)  
Ending balance 275.0 398.0 275.0 398.0  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held 2.0 2.0 5.0 5.0  
Retained interest in securitizations | Recurring | Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 36.0 37.0 36.0 41.0  
Total Gains or (Losses) (Realized/Unrealized), Included in Net Income (1.0) (1.0) (1.0) (5.0)  
Total Gains or (Losses) (Realized/Unrealized), Included in OCI 0.0 0.0 0.0 0.0  
Purchases 0.0 0.0 0.0 0.0  
Sales 0.0 0.0 0.0 0.0  
Issuances 0.0 0.0 0.0 0.0  
Settlements 0.0 0.0 0.0 0.0  
Transfers Into Level 3 0.0 0.0 0.0 0.0  
Transfers Out of Level 3 0.0 0.0 0.0 0.0  
Ending balance 35.0 36.0 35.0 36.0  
Net Unrealized Gains (Losses) Included in Net Income Related to Assets and Liabilities Still Held (1.0) (1.0) (1.0) (5.0)  
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 $ 4.0 $ (22.0) $ 71.0 $ (20.0)