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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | $ 5,645 | $ 5,417 | $ 4,780
Revenue (reduction) from other sources | 1,901 | 1,719 | 1,484
Total non-interest income | 7,546 | 7,136 | 6,264
Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 4,746 | 4,573 | 3,880
Revenue (reduction) from other sources | 1,194 | 1,198 | 926
Total non-interest income | 5,940 | 5,771 | 4,806
Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 555 | 485 | 513
Revenue (reduction) from other sources | 34 | (16) | 41
Total non-interest income | 589 | 469 | 554
Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 344 | 361 | 388
Revenue (reduction) from other sources | 658 | 768 | 760
Total non-interest income | 1,002 | 1,129 | 1,148
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 0 | (2) | (1)
Revenue (reduction) from other sources | 15 | (231) | (243)
Total non-interest income | 15 | (233) | (244)
Interchange fees, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 4,793 | 4,606 | 3,860
Customer reward expenses | 8,200 | 7,600 | 6,400
Interchange fees, net | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 4,333 | 4,178 | 3,497
Interchange fees, net | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 367 | 320 | 267
Interchange fees, net | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 91 | 109 | 96
Interchange fees, net | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 2 | (1) | 0
Service charges and other customer-related fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 306 | 327 | 457
Service charges and other customer-related fees | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 0 | 0 | 0
Service charges and other customer-related fees | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 86 | 91 | 171
Service charges and other customer-related fees | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 222 | 236 | 287
Service charges and other customer-related fees | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | (2) | 0 | (1)
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 546 | 484 | 463
Other | Operating segments | Credit Card |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 413 | 395 | 383
Other | Operating segments | Consumer Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 102 | 74 | 75
Other | Operating segments | Commercial Banking |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | 31 | 16 | 5
Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total contract revenue (loss) | $ 0 | $ (1) | $ 0

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