Other Fees and Commissions and Other Expenses (Details 1) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Other Fees and Commissions and Other Expenses [Abstract] | ||||
| Data processing and equipment | $ 613 | $ 577 | $ 1,772 | $ 1,690 |
| Professional services | 490 | 421 | 1,351 | 1,266 |
| Net unrealized and realized gains on Amex Ventures equity investments | (142) | (66) | (773) | (116) |
| Other | 257 | 297 | 745 | 908 |
| Total Other expenses | $ 1,218 | $ 1,229 | $ 3,095 | $ 3,748 |