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Accumulated Other Comprehensive Income (Loss) - Reconciliation of Transactions Affecting Accumulated Other Comprehensive Income (Loss) Included in Shareholders' Equity (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period $ (2,095) $ 503 $ 322 $ (1,373)
Changes in unrealized gains and losses 1,195 453 (2,183) 3,240
Changes in unrealized gains and losses 14 0 113 (257)
Changes in unrealized gains and losses 1,209 453 (2,070) 2,983
Foreign currency translation adjustment (1) 1 24 (12)
Reclassification to earnings of realized gains and losses (11) (59) 7 (65)
Applicable income taxes (304) (100) 515 (735)
Balance at end of period (1,202) 798 (1,202) 798
Unrealized Gains (Losses) on Investment Securities Available-For-Sale [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (125) 2,424 2,417 379
Changes in unrealized gains and losses 1,195 453 (2,183) 3,240
Reclassification to earnings of realized gains and losses (43) (81) (68) (131)
Applicable income taxes (292) (95) 569 (787)
Balance at end of period 735 2,701 735 2,701
Unrealized Gains (Losses) on Derivative Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (112) (233) (189) (51)
Changes in unrealized gains and losses 14   113 (257)
Reclassification to earnings of realized gains and losses (8) (9) (4) 4
Applicable income taxes (1) 2 (27) 64
Balance at end of period (107) (240) (107) (240)
Unrealized Gains (Losses) on Retirement Plans [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (1,813) (1,613) (1,842) (1,636)
Reclassification to earnings of realized gains and losses 40 31 79 62
Applicable income taxes (10) (7) (20) (15)
Balance at end of period (1,783) (1,589) (1,783) (1,589)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (45) (75) (64) (65)
Foreign currency translation adjustment (1) 1 24 (12)
Applicable income taxes (1)   (7) 3
Balance at end of period $ (47) $ (74) $ (47) $ (74)