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Regulatory Matters and Capital Adequacy (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Regulatory Matters And Capital Adequacy [Abstract]    
Well-capitalized ratios 10.00%  
Minimum capital ratios 8.00%  
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 6.00%  
Common Equity Tier 1 required, Minimum capital ratio 4.50%  
Common Equity Tier 1 required, Well-capitalized ratios 6.50%  
Parent Company [Member]    
Regulatory capital ratios    
Tier 1 capital $ 17,665 $ 18,265
Total capital $ 19,893 $ 20,551
Tier 1 capital ratio 13.50% 13.51%
Total capital ratio 15.20% 15.20%
Tier 1 leverage ratio 11.57% 11.68%
CET1 capital $ 16,134 $ 16,747
CET1 capital ratio 12.30% 12.40%
American Express Centurion Bank [Member]    
Regulatory capital ratios    
Tier 1 capital $ 6,134 $ 6,013
Total capital $ 6,600 $ 6,460
Tier 1 capital ratio 16.50% 16.90%
Total capital ratio 17.80% 18.20%
Tier 1 leverage ratio 16.20% 17.70%
CET1 capital $ 6,134 $ 6,013
CET1 capital ratio 16.50% 16.90%
American Express Bank, FSB [Member]    
Regulatory capital ratios    
Tier 1 capital $ 6,681 $ 6,927
Total capital $ 7,194 $ 7,601
Tier 1 capital ratio 16.30% 13.70%
Total capital ratio 17.50% 15.10%
Tier 1 leverage ratio 13.90% 13.20%
CET1 capital $ 6,681 $ 6,927
CET1 capital ratio 16.30% 13.70%