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Fair Value Hierarchy - Summary of Changes in Fair Value for Level 3 Loans (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Loans Receivable        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,251 $ 2,347 $ 1,837 $ 2,354
Net realized gains/(losses) 11 17 39 89
Net unrealized gains/(losses) (174) (89) (254) (217)
Purchases 6 7 86 212
Sales (5) (18) (462) (61)
Settlements (95) (156) (254) (429)
Transfers into level 3 0 141 0 272
Transfers out of level 3 (22) (191) (20) (162)
Ending balance 972 2,058 972 2,058
Corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 543 738 637 672
Net realized gains/(losses) 7 8 20 21
Net unrealized gains/(losses) (76) (10) (134) (30)
Purchases 5 7 47 119
Sales 0 (18) (47) (53)
Settlements (26) (77) (72) (116)
Transfers into level 3 0 39 0 65
Transfers out of level 3 (22) (19) (20) (10)
Ending balance 431 668 431 668
Real estate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 490 1,007 785 1,188
Net realized gains/(losses) 2 7 9 47
Net unrealized gains/(losses) (100) (79) (123) (167)
Purchases 1 0 2 73
Sales (5) 0 (196) (8)
Settlements (67) (70) (156) (249)
Transfers into level 3 0 100 0 128
Transfers out of level 3 0 (25) 0 (72)
Ending balance 321 940 321 940
Other collateralized        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 140 285 140 229
Net realized gains/(losses) 1 1 3 2
Net unrealized gains/(losses) 1 0 0 (1)
Purchases 0 0 2 2
Settlements 0 (1) (3) (26)
Transfers into level 3 0 2 0 13
Transfers out of level 3 0 (147) 0 (79)
Ending balance 142 140 142 140
Other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 78 317 275 265
Net realized gains/(losses) 1 1 7 19
Net unrealized gains/(losses) 1 0 3 (19)
Purchases 0 0 35 18
Sales 0 0 (219) 0
Settlements (2) (8) (23) (38)
Transfers into level 3 0 0 0 66
Transfers out of level 3 0 0 0 (1)
Ending balance $ 78 $ 310 $ 78 $ 310