Noninterest Revenue and Noninterest Expense - Card Income (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 card income | $ 1,348 | $ 1,344 | $ 2,538 | $ 2,560 |
| Interchange and merchant processing income | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | 10,037 | 9,159 | 19,152 | 17,557 |
| Rewards costs and partner payments | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | (8,436) | (7,350) | (15,919) | (14,135) |
| All other | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | $ (253) | $ (465) | $ (695) | $ (862) |
| Deferred revenues, recognition period | 12 months | 12 months | 12 months | 12 months |