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Loans - Loans, Level 3 Rollforward (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
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 $ 2,659 $ 1,890 $ 2,107 $ 1,890 $ 1,990
Net realized gains / (losses) 23   19 60 55
Net unrealized gains/(losses) 76   (10) 34 34
Purchases 181   55 557 134
Sales (17)   (71) (31) (24)
Settlements (221)   (242) (567) (600)
Transfers into level 3 166   126 928 477
Transfers out of level 3 (40)   (46) (44) (128)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 2,827   1,938 2,827 1,938
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 939 752 873 752 659
Net realized gains / (losses) 7   6 14 7
Net unrealized gains/(losses) 1   (23) (5) (29)
Purchases 132   48 184 111
Sales (9)   (67) (18) (14)
Settlements (58)   (124) (110) (220)
Transfers into level 3 23   51 230 248
Transfers out of level 3 (32)   (42) (44) (40)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 1,003   722 1,003 722
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 1,084 591 642 591 677
Net realized gains / (losses) 11   7 38 18
Net unrealized gains/(losses) 43   (15) 4 (2)
Purchases 40   2 323 12
Sales (5)   (3) (10) (6)
Settlements (120)   (68) (278) (200)
Transfers into level 3 121   34 498 100
Transfers out of level 3 (8)   (1)   (1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 1,166   598 1,166 598
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 268 221 174 221 290
Net realized gains / (losses) 3   2 7 11
Net unrealized gains/(losses) 11   8 8 21
Purchases 1   5 43 11
Sales (2)   (1) (2) (4)
Settlements (22)   (19) (57) (76)
Transfers into level 3 10   41 49 41
Transfers out of level 3   0 (3)   (87)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance 269   207 269 207
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 368 $ 326 418 326 364
Net realized gains / (losses) 2   4 1 19
Net unrealized gains/(losses) 21   20 27 44
Purchases 8     7  
Sales (1)     (1)  
Settlements (21)   (31) (122) (104)
Transfers into level 3 12     151 88
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance $ 389   $ 411 $ 389 $ 411