Noninterest Revenue and Noninterest Expense - Card Income (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | $ 1,428 | $ 1,140 | $ 3,966 | $ 3,700 |
| Interchange and merchant processing income | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | 10,062 | 9,218 | 29,214 | 26,775 |
| Rewards costs and partner payments | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | (8,403) | (7,614) | (24,322) | (21,749) |
| All other | ||||
| Disaggregation of Revenue [Line Items] | ||||
| Total card income | $ (231) | $ (464) | $ (926) | $ (1,326) |
| Deferred revenues, recognition period | 12 months | 12 months | 12 months | 12 months |