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Business Segments and Revenue from Contracts with Customers - Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 1,844 $ 1,468 $ 3,333 $ 2,858
Revenue (reduction) from other sources 653 492 1,151 1,016
Total non-interest income 2,497 1,960 4,484 3,874
Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,352 1,199 2,548 2,340
Revenue (reduction) from other sources 450 307 765 642
Total non-interest income 1,802 1,506 3,313 2,982
Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 379 167 563 313
Revenue (reduction) from other sources 15 5 14 18
Total non-interest income 394 172 577 331
Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 112 102 221 205
Revenue (reduction) from other sources 223 169 426 347
Total non-interest income 335 271 647 552
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 0 1 0
Revenue (reduction) from other sources (35) 11 (54) 9
Total non-interest income (34) 11 (53) 9
Interchange fees, net        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,478 1,249 2,701 2,394
Interchange fees, net | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,207 1,116 2,292 2,136
Interchange fees, net | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 248 107 363 205
Interchange fees, net | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 23 26 46 53
Interchange fees, net | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 0 0 0
Service charges and other customer-related fees        
Disaggregation of Revenue [Line Items]        
Total contract revenue 181 96 286 190
Service charges and other customer-related fees | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 20 0 20 0
Service charges and other customer-related fees | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 78 22 98 43
Service charges and other customer-related fees | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 82 74 167 147
Service charges and other customer-related fees | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 0 1 0
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 185 123 346 274
Other | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 125 83 236 204
Other | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 53 38 102 65
Other | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 7 2 8 5
Other | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 0 $ 0 $ 0 $ 0