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Regulatory Matters and Capital Adequacy (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Regulatory Matters And Capital Adequacy [Abstract]    
Well-capitalized ratios 10.00%  
Minimum capital ratios 9.30%  
Leverage capital required, Well-capitalized ratios 5.00%  
Leverage capital required, Minimum capital ratios 4.00%  
Risk-based capital required, Well-capitalized ratios 8.00%  
Risk-based capital required, Minimum capital ratios 7.30%  
Common Equity Tier 1 required, Minimum capital ratio 5.80%  
Common Equity Tier 1 required, Well-capitalized ratios 6.50%  
Parent Company [Member]    
Regulatory capital ratios    
Tier 1 capital $ 14,721 $ 17,665
Total capital $ 17,142 $ 19,893
Tier 1 capital ratio 10.10% 13.50%
Total capital ratio 11.80% 15.20%
Tier 1 leverage ratio 8.60% 11.57%
CET1 capital $ 13,189 $ 16,134
CET1 capital ratio 9.00% 12.30%
American Express Centurion Bank [Member]    
Regulatory capital ratios    
Tier 1 capital $ 5,954 $ 6,134
Total capital $ 6,547 $ 6,600
Tier 1 capital ratio 12.70% 16.50%
Total capital ratio 14.00% 17.80%
Tier 1 leverage ratio 10.20% 16.20%
CET1 capital $ 5,954 $ 6,134
CET1 capital ratio 12.70% 16.50%
American Express Bank, FSB [Member]    
Regulatory capital ratios    
Tier 1 capital $ 6,065 $ 6,681
Total capital $ 6,653 $ 7,194
Tier 1 capital ratio 12.90% 16.30%
Total capital ratio 14.20% 17.50%
Tier 1 leverage ratio 11.70% 13.90%
CET1 capital $ 6,065 $ 6,681
CET1 capital ratio 12.90% 16.30%