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Debt - Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Outstanding balance | $ 49,715 | $ 47,866
Unamortized Underwriting Fees | (96) |
Long-term Debt |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 49,715 | $ 47,866
Year-End Stated Rate on Debt (as a percent) | 4.51% | 3.96%
Unamortized Underwriting Fees | $ (96) | $ (93)
Parent Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | 35,312 | 33,952
Fixed Rate Senior Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 14,582 | $ 20,930
Year-End Stated Rate on Debt (as a percent) | 3.66% | 3.48%
Year-End Interest Rate with Swaps (as a percent) | 3.80% | 4.14%
Fixed Rate Senior Notes | Subsidiaries | Long-term Debt | American Express Credit Corporation |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 333 | $ 330
Year-End Stated Rate on Debt (as a percent) | 3.30% | 3.30%
Year-End Interest Rate with Swaps (as a percent) | 0.00% | 0.00%
Fixed Rate Senior Notes | Subsidiaries | Long-term Debt | Lending Trust |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 13,934 | $ 13,449
Year-End Stated Rate on Debt (as a percent) | 4.23% | 3.36%
Year-End Interest Rate with Swaps (as a percent) | 4.32% | 3.49%
Floating Rate Senior Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 3,000 | $ 2,400
Year-End Stated Rate on Debt (as a percent) | 5.49% | 6.21%
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 | $ 15,973 | $ 8,769
Year-End Stated Rate on Debt (as a percent) | 5.35% | 5.38%
Year-End Interest Rate with Swaps (as a percent) | 5.57% | 5.91%
Fixed Rate Subordinated Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 0 | $ 586
Year-End Stated Rate on Debt (as a percent) | 0.00% | 3.63%
Year-End Interest Rate with Swaps (as a percent) | 0.00% | 6.74%
Fixed-to-Floating Rate Subordinated Notes | Parent Company | Long-term Debt | American Express Company |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 1,742 | $ 1,257
Year-End Stated Rate on Debt (as a percent) | 5.44% | 5.24%
Year-End Interest Rate with Swaps (as a percent) | 5.80% | 5.92%
Floating Rate Borrowings | Subsidiaries | Long-term Debt | Other Subsidiaries |  |
Debt Instrument [Line Items] |  |
Outstanding balance | $ 247 | $ 238
Year-End Stated Rate on Debt (as a percent) | 0.76% | 0.42%
Year-End Interest Rate with Swaps (as a percent) | 0.00% | 0.00%

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