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Variable Interest Entities and Securitizations - Carrying Amount of Assets and Liabilities of Variable Interest Entities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated $ 36,700 $ 34,651
Carrying Amount of Liabilities, Consolidated 20,790 19,798
Carrying Amount of Assets, Unconsolidated 4,948 4,250
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 1,674 1,120
Maximum exposure to loss 5,550 5,325
Affordable housing entities    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 226 174
Carrying Amount of Liabilities, Consolidated 10 9
Carrying Amount of Assets, Unconsolidated 4,175 3,862
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 1,284 1,093
Variable Interest Entities, nonconsolidated, Carrying amount of Assets included in certain investment structures 2,200 1,900
Variable Interest Entities, nonconsolidated, Carrying amount of liabilities included in certain investment structures 901 618
Maximum exposure to loss 4,175 3,862
Entities that provide capital to low-income and rural communities    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 1,498 927
Carrying Amount of Liabilities, Consolidated 129 127
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 318 187
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 0 0
Maximum exposure to loss 318 187
Total Other VIEs    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 1,724 1,101
Carrying Amount of Liabilities, Consolidated 139 136
Carrying Amount of Assets, Unconsolidated 4,493 4,049
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 1,284 1,093
Maximum exposure to loss 4,493 4,049
Credit card loan securitizations    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 34,976 33,550
Carrying Amount of Liabilities, Consolidated 20,651 19,662
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 455 201
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 390 27
Maximum exposure to loss 1,057 1,276
Total securitization-related VIEs    
Variable Interest Entity [Line Items]    
Carrying Amount of Assets, Consolidated 34,976 33,550
Carrying Amount of Liabilities, Consolidated 20,651 19,662
Carrying Amount of Assets, Unconsolidated 455 201
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities 390 27
Maximum exposure to loss $ 1,057 $ 1,276