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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Total contract revenue $ 3,737 $ 3,820 $ 3,431
Revenue from other sources 1,873 1,433 1,770
Non-interest income (loss) 5,610 5,253 5,201
Operating segments | Credit Card      
Disaggregation of Revenue [Line Items]      
Total contract revenue 3,062 3,045 2,617
Revenue from other sources 761 843 903
Non-interest income (loss) 3,823 3,888 3,520
Operating segments | Consumer Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 436 604 661
Revenue from other sources 30 39 2
Non-interest income (loss) 466 643 663
Operating segments | Commercial Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 242 178 158
Revenue from other sources 681 653 586
Non-interest income (loss) 923 831 744
Other      
Disaggregation of Revenue [Line Items]      
Total contract revenue (3) (7) (5)
Revenue from other sources 401 (102) 279
Non-interest income (loss) 398 (109) 274
Interchange fees, net      
Disaggregation of Revenue [Line Items]      
Total contract revenue 3,017 3,179 2,823
Customer reward expenses 4,900 4,900 4,400
Interchange fees, net | Operating segments | Credit Card      
Disaggregation of Revenue [Line Items]      
Total contract revenue 2,747 2,925 2,609
Interchange fees, net | Operating segments | Consumer Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 209 205 185
Interchange fees, net | Operating segments | Commercial Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 63 55 33
Interchange fees, net | Other      
Disaggregation of Revenue [Line Items]      
Total contract revenue (2) (6) (4)
Service changes and other customer-related fees      
Disaggregation of Revenue [Line Items]      
Total contract revenue 362 417 489
Service changes and other customer-related fees | Operating segments | Credit Card      
Disaggregation of Revenue [Line Items]      
Total contract revenue 0 0 0
Service changes and other customer-related fees | Operating segments | Consumer Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 188 298 367
Service changes and other customer-related fees | Operating segments | Commercial Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 175 120 123
Service changes and other customer-related fees | Other      
Disaggregation of Revenue [Line Items]      
Total contract revenue (1) (1) (1)
Other contract revenue      
Disaggregation of Revenue [Line Items]      
Total contract revenue 358 224 119
Other contract revenue | Operating segments | Credit Card      
Disaggregation of Revenue [Line Items]      
Total contract revenue 315 120 8
Other contract revenue | Operating segments | Consumer Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 39 101 109
Other contract revenue | Operating segments | Commercial Banking      
Disaggregation of Revenue [Line Items]      
Total contract revenue 4 3 2
Other contract revenue | Other      
Disaggregation of Revenue [Line Items]      
Total contract revenue $ 0 $ 0 $ 0