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Variable Interest Entities and Securitizations - Carrying Amount of Assets and Liabilities of Variable Interest Entities (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated $ 35,751 $ 36,700
Carrying Amount of Liabilities, Consolidated 19,472 20,790
Carrying Amount of Assets, Unconsolidated 4,611 4,948
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 1,361 1,674
Maximum exposure to loss 4,975 5,550
Affordable housing entities    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 233 226
Carrying Amount of Liabilities, Consolidated 11 10
Carrying Amount of Assets, Unconsolidated 4,071 4,175
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 1,260 1,284
Variable Interest Entities, nonconsolidated, Carrying amount of Assets included in certain investment structures 2,200 2,200
Variable Interest Entities, nonconsolidated, Carrying amount of liabilities included in certain investment structures 879 901
Maximum exposure to loss 4,071 4,175
Entities that provide capital to low-income and rural communities    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 1,763 1,498
Carrying Amount of Liabilities, Consolidated 122 129
Carrying Amount of Assets, Unconsolidated 0 0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 0 0
Maximum exposure to loss 0 0
Other    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 0 0
Carrying Amount of Liabilities, Consolidated 0 0
Carrying Amount of Assets, Unconsolidated 303 318
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 0 0
Maximum exposure to loss 303 318
Total Other VIEs    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 1,996 1,724
Carrying Amount of Liabilities, Consolidated 133 139
Carrying Amount of Assets, Unconsolidated 4,374 4,493
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 1,260 1,284
Maximum exposure to loss 4,374 4,493
Credit card loan securitizations    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 33,755 34,976
Carrying Amount of Liabilities, Consolidated 19,339 20,651
Carrying Amount of Assets, Unconsolidated 0 0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 0 0
Maximum exposure to loss 0 0
Home loan    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 0 0
Carrying Amount of Liabilities, Consolidated 0 0
Carrying Amount of Assets, Unconsolidated 237 455
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 101 390
Maximum exposure to loss 601 1,057
Total securitization-related VIEs    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 33,755 34,976
Carrying Amount of Liabilities, Consolidated 19,339 20,651
Carrying Amount of Assets, Unconsolidated 237 455
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 101 390
Maximum exposure to loss $ 601 $ 1,057