v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 2,762 $ 1,844 $ 5,172 $ 3,333
Revenue (reduction) from other sources 714 653 1,390 1,151
Total non-interest income 3,476 2,497 6,562 4,484
Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,938 1,352 3,565 2,548
Revenue (reduction) from other sources 575 450 1,101 765
Total non-interest income 2,513 1,802 4,666 3,313
Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 755 379 1,437 563
Revenue (reduction) from other sources 23 15 24 14
Total non-interest income 778 394 1,461 577
Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 68 112 166 221
Revenue (reduction) from other sources 197 223 427 426
Total non-interest income 265 335 593 647
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 1 4 1
Revenue (reduction) from other sources (81) (35) (162) (54)
Total non-interest income (80) (34) (158) (53)
Interchange fees, net        
Disaggregation of Revenue [Line Items]        
Total contract revenue 2,256 1,478 4,220 2,701
Interchange fees, net | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1,718 1,207 3,187 2,292
Interchange fees, net | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 538 248 1,013 363
Interchange fees, net | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 23 20 46
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 251 181 500 286
Service charges and other customer-related fees | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 32 20 54 20
Service charges and other customer-related fees | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 152 78 301 98
Service charges and other customer-related fees | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 67 82 143 167
Service charges and other customer-related fees | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 0 1 2 1
Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue 255 185 452 346
Other | Operating segments | Credit Card        
Disaggregation of Revenue [Line Items]        
Total contract revenue 188 125 324 236
Other | Operating segments | Consumer Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 65 53 123 102
Other | Operating segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Total contract revenue 1 7 3 8
Other | Other        
Disaggregation of Revenue [Line Items]        
Total contract revenue $ 1 $ 0 $ 2 $ 0