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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Total contract revenue $ 937 $ 894
Revenue from other sources 287 398
Non-interest income 1,224 1,292
Operating segments | Credit Card    
Disaggregation of Revenue [Line Items]    
Total contract revenue 758 714
Revenue from other sources 153 236
Non-interest income 911 950
Operating segments | Consumer Banking    
Disaggregation of Revenue [Line Items]    
Total contract revenue 133 145
Revenue from other sources (7) 15
Non-interest income 126 160
Operating segments | Commercial Banking    
Disaggregation of Revenue [Line Items]    
Total contract revenue 47 36
Revenue from other sources 191 151
Non-interest income 238 187
Other    
Disaggregation of Revenue [Line Items]    
Total contract revenue (1) (1)
Revenue from other sources (50) (4)
Non-interest income (51) (5)
Interchange fees, net    
Disaggregation of Revenue [Line Items]    
Total contract revenue 752 758
Interchange fees, net | Operating segments | Credit Card    
Disaggregation of Revenue [Line Items]    
Total contract revenue 688 702
Interchange fees, net | Operating segments | Consumer Banking    
Disaggregation of Revenue [Line Items]    
Total contract revenue 50 46
Interchange fees, net | Operating segments | Commercial Banking    
Disaggregation of Revenue [Line Items]    
Total contract revenue 15 11
Interchange fees, net | Other    
Disaggregation of Revenue [Line Items]    
Total contract revenue (1) (1)
Service changes and other customer-related fees    
Disaggregation of Revenue [Line Items]    
Total contract revenue 95 100
Service changes and other customer-related fees | Operating segments | Credit Card    
Disaggregation of Revenue [Line Items]    
Total contract revenue 0 0
Service changes and other customer-related fees | Operating segments | Consumer Banking    
Disaggregation of Revenue [Line Items]    
Total contract revenue 64 75
Service changes and other customer-related fees | Operating segments | Commercial Banking    
Disaggregation of Revenue [Line Items]    
Total contract revenue 31 25
Service changes and other customer-related fees | Other    
Disaggregation of Revenue [Line Items]    
Total contract revenue 0 0
Other contract revenue    
Disaggregation of Revenue [Line Items]    
Total contract revenue 90 36
Other contract revenue | Operating segments | Credit Card    
Disaggregation of Revenue [Line Items]    
Total contract revenue 70 12
Other contract revenue | Operating segments | Consumer Banking    
Disaggregation of Revenue [Line Items]    
Total contract revenue 19 24
Other contract revenue | Operating segments | Commercial Banking    
Disaggregation of Revenue [Line Items]    
Total contract revenue 1 0
Other contract revenue | Other    
Disaggregation of Revenue [Line Items]    
Total contract revenue $ 0 $ 0