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Debt - Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Outstanding balance | $ 47,866 | $ 42,573
Unamortized Underwriting Fees | (93) |
Long-term Debt |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 47,866 | $ 42,573
Year-End Stated Rate on Debt (as a percent) | 3.96% | 3.42%
Unamortized Underwriting Fees | $ (93) | $ (84)
Parent Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | 33,952 | 29,432
Fixed Rate Senior Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 20,930 | $ 23,813
Year-End Stated Rate on Debt (as a percent) | 3.48% | 3.34%
Year-End Interest Rate with Swaps (as a percent) | 4.14% | 4.00%
Fixed Rate Senior Notes | Subsidiaries | Long-term Debt | American Express Credit Corporation |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 330 | $ 328
Year-End Stated Rate on Debt (as a percent) | 3.30% | 3.30%
Year-End Interest Rate with Swaps (as a percent) |  | 0.00%
Fixed Rate Senior Notes | Subsidiaries | Long-term Debt | Lending Trust |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 13,449 | $ 10,499
Year-End Stated Rate on Debt (as a percent) | 3.36% | 2.81%
Year-End Interest Rate with Swaps (as a percent) | 3.49% | 0.00%
Floating Rate Senior Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 2,400 | $ 3,000
Year-End Stated Rate on Debt (as a percent) | 6.21% | 4.78%
Year-End Interest Rate with Swaps (as a percent) | 0.00% | 0.00%
Floating Rate Senior Notes | Subsidiaries | Long-term Debt | Lending Trust |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 0 | $ 2,125
Year-End Stated Rate on Debt (as a percent) | 0.00% | 4.67%
Year-End Interest Rate with Swaps (as a percent) |  | 0.00%
Fixed-to-Floating Rate Senior Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 8,769 | $ 1,250
Year-End Stated Rate on Debt (as a percent) | 5.38% | 4.42%
Year-End Interest Rate with Swaps (as a percent) | 5.91% | 0.00%
Fixed Rate Subordinated Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 586 | $ 574
Year-End Stated Rate on Debt (as a percent) | 3.63% | 3.63%
Year-End Interest Rate with Swaps (as a percent) | 6.74% | 5.46%
Fixed-to-Floating Rate Subordinated Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 1,257 | $ 750
Year-End Stated Rate on Debt (as a percent) | 5.24% | 4.99%
Year-End Interest Rate with Swaps (as a percent) | 5.92% | 0.00%
Floating Rate Subordinated Notes | Subsidiaries | Long-term Debt | Lending Trust |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 0 | $ 61
Year-End Stated Rate on Debt (as a percent) | 0.00% | 4.89%
Year-End Interest Rate with Swaps (as a percent) |  | 0.00%
Fixed Rate Instruments | Subsidiaries | Financed Leases | Long-term Debt | Other Subsidiaries |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 0 | $ 3
Year-End Stated Rate on Debt (as a percent) | 0.00% | 5.76%
Year-End Interest Rate with Swaps (as a percent) |  | 0.00%
Floating Rate Borrowings | Subsidiaries | Long-term Debt | Other Subsidiaries |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 238 | $ 254
Year-End Stated Rate on Debt (as a percent) | 0.42% | 0.41%
Year-End Interest Rate with Swaps (as a percent) |  | 0.00%

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