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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 2,283 $ 1,447 $ 5,616 $ 4,305
Revenue (reduction) from other sources 672 491 1,823 1,507
Total non-interest income 2,955 1,938 7,439 5,812
Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,684 1,153 4,232 3,493
Revenue (reduction) from other sources 527 356 1,292 998
Total non-interest income 2,211 1,509 5,524 4,491
Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 464 172 1,027 485
Revenue (reduction) from other sources 11 10 25 28
Total non-interest income 475 182 1,052 513
Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 135 121 356 326
Revenue (reduction) from other sources 183 171 609 518
Total non-interest income 318 292 965 844
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 1 1 1
Revenue (reduction) from other sources (49) (46) (103) (37)
Total non-interest income (49) (45) (102) (36)
Interchange fees, net        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,812 1,228 4,513 3,622
Interchange fees, net | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,521 1,086 3,813 3,222
Interchange fees, net | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 268 113 631 318
Interchange fees, net | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 23 28 69 81
Interchange fees, net | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 1 0 1
Service charges and other customer-related fees        
Disaggregation of Revenue [Line Items]        
Total contract revenue 292 115 578 305
Service charges and other customer-related fees | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 37 0 57 0
Service charges and other customer-related fees | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 144 23 242 66
Service charges and other customer-related fees | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 111 92 278 239
Service charges and other customer-related fees | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 0 1 0
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 179 104 525 378
Other | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 126 67 362 271
Other | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 52 36 154 101
Other | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 1 9 6
Other | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 0 $ 0 $ 0 $ 0