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Debt (Details 1) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Outstanding balance $ 42,952 $ 57,835
Unamortized Underwriting Fees (64)  
Long-term Debt [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 42,952 $ 57,835
Year-End Stated Rate on Debt 2.49% 2.66%
Unamortized Underwriting Fees $ (64) $ (112)
Parent Company [Member]    
Debt Instrument [Line Items]    
Outstanding balance 22,810 24,368
Fixed Rate Senior Notes [Member] | Parent Company [Member] | Long-term Debt [Member] | American Express Company [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 18,251 $ 19,326
Year-End Stated Rate on Debt 3.25% 3.17%
Year-End Interest Rate with Swaps 2.09% 2.86%
Fixed Rate Senior Notes [Member] | Subsidiaries [Member] | Long-term Debt [Member] | American Express Credit Corporation [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 6,746 $ 11,839
Year-End Stated Rate on Debt 2.38% 2.40%
Year-End Interest Rate with Swaps 1.67% 2.53%
Fixed Rate Senior Notes [Member] | Subsidiaries [Member] | Long-term Debt [Member] | Lending Trust [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 8,325 $ 15,074
Year-End Stated Rate on Debt 2.74% 2.42%
Year-End Interest Rate with Swaps 2.55% 2.43%
Floating Rate Senior Notes [Member] | Parent Company [Member] | Long-term Debt [Member] | American Express Company [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 4,000 $ 4,500
Year-End Stated Rate on Debt 0.84% 2.49%
Year-End Interest Rate with Swaps 0.00% 0.00%
Floating Rate Senior Notes [Member] | Subsidiaries [Member] | Long-term Debt [Member] | American Express Credit Corporation [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 300 $ 1,650
Year-End Stated Rate on Debt 0.93% 2.64%
Year-End Interest Rate with Swaps 0.00% 0.00%
Floating Rate Senior Notes [Member] | Subsidiaries [Member] | Long-term Debt [Member] | Lending Trust [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 4,125 $ 4,125
Year-End Stated Rate on Debt 0.51% 2.09%
Year-End Interest Rate with Swaps 0.00% 0.00%
Floating Rate Subordinated Notes [Member] | Subsidiaries [Member] | Long-term Debt [Member] | Lending Trust [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 79 $ 79
Year-End Stated Rate on Debt 0.73% 2.31%
Year-End Interest Rate with Swaps 0.00% 0.00%
Fixed Rate Subordinated Notes [Member] | Parent Company [Member] | Long-term Debt [Member] | American Express Company [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 599 $ 598
Year-End Stated Rate on Debt 3.63% 3.63%
Year-End Interest Rate with Swaps 1.43% 2.99%
Fixed Rate Subordinated Notes [Member] | Subsidiaries [Member] | Long-term Debt [Member] | Lending Trust [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 246 $ 420
Year-End Stated Rate on Debt 2.80% 2.53%
Year-End Interest Rate with Swaps 0.00% 0.00%
Fixed Rate Instruments [Member] | Subsidiaries [Member] | Financed Leases [Member] | Long-term Debt [Member] | Other Subsidiaries [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 17 $ 25
Year-End Stated Rate on Debt 5.54% 5.65%
Year-End Interest Rate with Swaps 0.00% 0.00%
Floating Rate Borrowings [Member] | Subsidiaries [Member] | Long-term Debt [Member] | Other Subsidiaries [Member]    
Debt Instrument [Line Items]    
Outstanding balance $ 328 $ 311
Year-End Stated Rate on Debt 0.42% 0.40%
Year-End Interest Rate with Swaps 0.00% 0.00%