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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 1,447 $ 1,475 $ 4,305 $ 4,169
Revenue (reduction) from other sources 491 468 1,507 1,390
Total non-interest income (loss) 1,938 1,943 5,812 5,559
Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,153 1,226 3,493 3,508
Revenue (reduction) from other sources 356 287 998 867
Total non-interest income (loss) 1,509 1,513 4,491 4,375
Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 172 141 485 408
Revenue (reduction) from other sources 10 1 28 18
Total non-interest income (loss) 182 142 513 426
Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 121 108 326 253
Revenue (reduction) from other sources 171 180 518 504
Total non-interest income (loss) 292 288 844 757
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 0 1 0
Revenue (reduction) from other sources (46) 0 (37) 1
Total non-interest income (loss) (45) 0 (36) 1
Interchange fees, net        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,228 1,234 3,622 3,586
Interchange fees, net | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,086 1,115 3,222 3,251
Interchange fees, net | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 113 92 318 270
Interchange fees, net | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 28 27 81 64
Interchange fees, net | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 0 1 1
Service charges and other customer-related fees        
Disaggregation of Revenue [Line Items]        
Total contract revenue 115 99 305 236
Service charges and other customer-related fees | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 0 0 0
Service charges and other customer-related fees | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 23 21 66 64
Service charges and other customer-related fees | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 92 78 239 173
Service charges and other customer-related fees | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 0 0 (1)
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 104 142 378 347
Other | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 67 111 271 257
Other | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 36 28 101 74
Other | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 3 6 16
Other | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 0 $ 0 $ 0 $ 0