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Regulatory Matters and Capital Adequacy (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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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 | $ 18,208 | $ 14,721
Total capital | $ 20,737 | $ 17,142
Tier 1 capital ratio | 11.80% | 10.10%
Total capital ratio | 13.40% | 11.80%
Tier 1 leverage ratio | 10.10% | 8.60%
CET1 capital | $ 16,636 | $ 13,189
CET1 capital ratio | 10.80% | 9.00%
SLR ratio | 8.60% |
American Express National Bank [Member] |  |
Regulatory capital ratios |  |
Tier 1 capital | $ 11,504 |
Total capital | $ 13,465 |
Tier 1 capital ratio | 12.50% |
Total capital ratio | 14.60% |
Tier 1 leverage ratio | 10.00% |
CET1 capital | $ 11,504 |
CET1 capital ratio | 12.50% |
SLR ratio | 8.30% |
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%

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