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Regulatory Matters and Capital Adequacy (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
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 ratio 6.50%  
SLR, Minimum capital ratio 3.00%  
SLR, Basel III Standards 2018 3.00%  
Basel III Standards 2018 9.90%  
Leverage capital required, Basel III Standards 2018 4.00%  
Risk-based capital required, Basel III Standards 2018 7.90%  
Common Equity Tier 1 required, Basel III Standards 2018 6.40%  
Parent Company [Member]    
Regulatory capital ratios    
Tier 1 capital $ 16,810 $ 14,721
Total capital $ 19,290 $ 17,142
Tier 1 capital ratio 11.10% 10.10%
Total capital ratio 12.80% 11.80%
Tier 1 leverage ratio 9.70% 8.60%
CET1 capital $ 15,237 $ 13,189
CET1 capital ratio 10.10% 9.00%
SLR ratio 8.30%  
American Express National Bank [Member]    
Regulatory capital ratios    
Tier 1 capital $ 11,494  
Total capital $ 13,433  
Tier 1 capital ratio 12.70%  
Total capital ratio 14.90%  
Tier 1 leverage ratio 10.30%  
CET1 capital $ 11,494  
CET1 capital ratio 12.70%  
SLR ratio 8.50%  
American Express Centurion Bank [Member]    
Regulatory capital ratios    
Tier 1 capital   $ 5,954
Total capital   $ 6,547
Tier 1 capital ratio   12.70%
Total capital ratio   14.00%
Tier 1 leverage ratio   10.20%
CET1 capital   $ 5,954
CET1 capital ratio   12.70%
American Express Bank, FSB [Member]    
Regulatory capital ratios    
Tier 1 capital   $ 6,065
Total capital   $ 6,653
Tier 1 capital ratio   12.90%
Total capital ratio   14.20%
Tier 1 leverage ratio   11.70%
CET1 capital   $ 6,065
CET1 capital ratio   12.90%