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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Total contract revenue $ 3,820 $ 3,431  
Revenue from other sources 1,433 1,770  
Non-interest income 5,253 5,201 $ 4,777
Operating segments | Credit Card      
Disaggregation of Revenue [Line Items]      
Total contract revenue 3,045 2,617  
Revenue from other sources 843 903  
Non-interest income 3,888 3,520 3,325
Operating segments | Consumer Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 604 661  
Revenue from other sources 39 2  
Non-interest income 643 663 749
Operating segments | Commercial Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 178 158  
Revenue from other sources 653 586  
Non-interest income 831 744 708
Other      
Disaggregation of Revenue [Line Items]      
Total contract revenue (7) (5)  
Revenue from other sources (102) 279  
Non-interest income (109) 274 $ (5)
Interchange fees, net      
Disaggregation of Revenue [Line Items]      
Total contract revenue 3,179 2,823  
Customer reward expenses 4,900 4,400  
Interchange fees, net | Operating segments | Credit Card      
Disaggregation of Revenue [Line Items]      
Total contract revenue 2,925 2,609  
Interchange fees, net | Operating segments | Consumer Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 205 185  
Interchange fees, net | Operating segments | Commercial Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 55 33  
Interchange fees, net | Other      
Disaggregation of Revenue [Line Items]      
Total contract revenue (6) (4)  
Service changes and other customer-related fees      
Disaggregation of Revenue [Line Items]      
Total contract revenue 417 489  
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 298 367  
Service changes and other customer-related fees | Operating segments | Commercial Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 120 123  
Service changes and other customer-related fees | Other      
Disaggregation of Revenue [Line Items]      
Total contract revenue (1) (1)  
Other contract revenue      
Disaggregation of Revenue [Line Items]      
Total contract revenue 224 119  
Other contract revenue | Operating segments | Credit Card      
Disaggregation of Revenue [Line Items]      
Total contract revenue 120 8  
Other contract revenue | Operating segments | Consumer Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 101 109  
Other contract revenue | Operating segments | Commercial Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 3 2  
Other contract revenue | Other      
Disaggregation of Revenue [Line Items]      
Total contract revenue $ 0 $ 0