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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 805 $ 969 $ 1,742 $ 1,863
Revenue from other sources 291 409 578 807
Non-interest income 1,096 1,378 2,320 2,670
Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 669 777 1,427 1,491
Revenue from other sources 176 261 329 497
Non-interest income 845 1,038 1,756 1,988
Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 82 152 215 297
Revenue from other sources 15 14 8 29
Non-interest income 97 166 223 326
Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 56 42 103 78
Revenue from other sources 124 158 315 309
Non-interest income 180 200 418 387
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue (2) (2) (3) (3)
Revenue from other sources (24) (24) (74) (28)
Non-interest income (26) (26) (77) (31)
Interchange fees, net        
Disaggregation of Revenue [Line Items]        
Total contract revenue 672 820 1,424 1,578
Interchange fees, net | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 612 757 1,300 1,459
Interchange fees, net | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 48 52 98 98
Interchange fees, net | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 13 13 28 24
Interchange fees, net | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue (1) (2) (2) (3)
Service changes and other customer-related fees        
Disaggregation of Revenue [Line Items]        
Total contract revenue 73 102 168 202
Service changes and other customer-related fees | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 0 0 0
Service changes and other customer-related fees | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 31 74 95 149
Service changes and other customer-related fees | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 43 28 74 53
Service changes and other customer-related fees | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue (1) 0 (1) 0
Other contract revenue        
Disaggregation of Revenue [Line Items]        
Total contract revenue 60 47 150 83
Other contract revenue | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 57 20 127 32
Other contract revenue | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 3 26 22 50
Other contract revenue | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 1 1 1
Other contract revenue | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 0 $ 0 $ 0 $ 0