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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at the beginning $ 21,012 $ 17,089 $ 19,908 $ 15,506
Net realized loss (22) 123 23 258
Net unrealized losses (194) 11 (346) 455
Purchases 2,059 2,517 6,730 8,124
Sales (1,099) (860) (3,305) (3,375)
Repayments (777) (1,328) (2,183) (3,537)
PIK interest and dividends 71 65 218 180
Net accretion of discount on securities 3 5 8 11
Net transfers in and/or out of Level 3 (76) 44 (76) 44
Balance at the end $ 20,977 $ 17,666 $ 20,977 $ 17,666