v3.21.2
Loans - Loans, Level 3 Rollforward (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Loans Receivable [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance $ 2,229 $ 2,659 $ 2,678 $ 1,890
Net realized gains / (losses) 23 23 72 60
Net unrealized gains/(losses) (16) 76 (31) 34
Purchases 74 181 140 557
Sales (13) (17) (17) (31)
Settlements (181) (221) (555) (567)
Transfers into level 3 93 166 181 928
Transfers out of level 3 (10) (40) (269) (44)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 2,199 2,827 2,199 2,827
Corporate [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 852 939 929 752
Net realized gains / (losses) 11 7 21 14
Net unrealized gains/(losses) (16) 1 (24) (5)
Purchases 17 132 63 184
Sales (13) (9) (13) (18)
Settlements (81) (58) (208) (110)
Transfers into level 3 15 23 103 230
Transfers out of level 3 (10) (32) (96) (44)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 775 1,003 775 1,003
Commercial real estate [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 920 1,084 1,104 591
Net realized gains / (losses) 9 11 33 38
Net unrealized gains/(losses) 11 43 (15) 4
Purchases   40 19 323
Sales   (5) (3) (10)
Settlements (82) (120) (227) (278)
Transfers into level 3 78 121 78 498
Transfers out of level 3   (8) (53)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 936 1,166 936 1,166
Residential real estate [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 118 268 260 221
Net realized gains / (losses) 3 3 6 7
Net unrealized gains/(losses) 1 11 (36) 8
Purchases 57 1 58 43
Sales   (2) (1) (2)
Settlements (13) (22) (45) (57)
Transfers into level 3   10   49
Transfers out of level 3     (76)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 166 269 166 269
Wealth management and other [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance 339 368 385 326
Net realized gains / (losses)   2 12 1
Net unrealized gains/(losses) (12) 21 44 27
Purchases   8   7
Sales   (1)   (1)
Settlements (5) (21) (75) (122)
Transfers into level 3   12   151
Transfers out of level 3     (44)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance $ 322 $ 389 $ 322 $ 389