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Loans - Summary of Changes in Fair Value for Level 3 Loans (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Loans Receivable        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 2,347 $ 2,229 $ 2,354 $ 2,678
Net realized gains/(losses) 17 23 89 72
Net unrealized gains/(losses) (89) (16) (217) (31)
Purchases 7 74 212 140
Sales (18) (13) (61) (17)
Settlements (156) (181) (429) (555)
Transfers into level 3 141 93 272 181
Transfers out of level 3 (191) (10) (162) (269)
Ending balance 2,058 2,199 2,058 2,199
Corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 958 852 837 929
Net realized gains/(losses) 9 11 21 21
Net unrealized gains/(losses) (10) (16) (31) (24)
Purchases 7 17 121 63
Sales (18) (13) (53) (13)
Settlements (78) (81) (141) (208)
Transfers into level 3 41 15 78 103
Transfers out of level 3 (166) (10) (89) (96)
Ending balance 743 775 743 775
Commercial real estate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 891 920 983 1,104
Net realized gains/(losses) 6 9 47 33
Net unrealized gains/(losses) (70) 11 (149) (15)
Purchases 0 0 69 19
Sales 0 0 (7) (3)
Settlements (57) (82) (162) (227)
Transfers into level 3 100 78 109 78
Transfers out of level 3 (25) 0 (45) (53)
Ending balance 845 936 845 936
Residential real estate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 116 118 205 260
Net realized gains/(losses) 1 3 0 6
Net unrealized gains/(losses) (9) 1 (18) (36)
Purchases 0 57 4 58
Sales 0 0 (1) (1)
Settlements (13) (13) (87) (45)
Transfers into level 3 0 0 19 0
Transfers out of level 3 0 0 (27) (76)
Ending balance 95 166 95 166
Wealth management and other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 382 339 329 385
Net realized gains/(losses) 1 0 21 12
Net unrealized gains/(losses) 0 (12) (19) 44
Purchases 0 0 18 0
Settlements (8) (5) (39) (75)
Transfers into level 3 0 0 66 0
Transfers out of level 3 0 0 (1) (44)
Ending balance $ 375 $ 322 $ 375 $ 322