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Regulatory Matters and Capital Adequacy (Details) $ in Millions | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Regulatory Matters And Capital Adequacy |  |
Common Equity Tier 1 required, Minimum capital ratio | 0.045 |
Risk-based capital required, Well-capitalized ratios, Minimum capital ratios | 0.060 |
Minimum capital ratios | 0.080 |
Leverage capital required, Minimum capital ratios | 0.040 |
Supplementary leverage ratio, Well-capitalized, minimum | 0.03 |
Parent Company | American Express Company |  |
Regulatory capital ratios |  |
CET1 capital | $ 24,860 | $ 23,174
Tier 1 capital | 26,405 | 24,779
Total capital | $ 31,127 | $ 28,784
CET1 capital ratio | 0.105 | 0.105
Tier 1 capital ratio | 0.112 | 0.113
Total capital ratio | 0.132 | 0.131
Tier 1 leverage ratio | 0.098 | 0.099
Supplementary Leverage Ratio | 0.083 |
Regulatory Matters And Capital Adequacy |  |
Common Equity Tier 1 required, Minimum capital ratio | 0.070 |
Risk-based capital required, Well-capitalized ratios, Well-capitalized ratios | 0.060 |
Risk-based capital required, Well-capitalized ratios, Minimum capital ratios, including buffer | 0.085 |
Well-capitalized ratios | 0.100 |
Minimum capital ratios | 0.105 |
Leverage capital required, Minimum capital ratios | 0.040 |
Supplementary leverage ratio, Well-capitalized, minimum | 0.030 |
Subsidiaries | American Express National Bank |  |
Regulatory capital ratios |  |
CET1 capital | $ 18,748 | $ 17,038
Tier 1 capital | 18,748 | 17,038
Total capital | $ 21,289 | $ 19,548
CET1 capital ratio | 0.116 | 0.116
Tier 1 capital ratio | 0.116 | 0.116
Total capital ratio | 0.132 | 0.133
Tier 1 leverage ratio | 0.096 | 0.095
Supplementary Leverage Ratio | 0.080 |
Regulatory Matters And Capital Adequacy |  |
Common Equity Tier 1 required, Well-capitalized ratios | 0.065 |
Common Equity Tier 1 required, Minimum capital ratio | 0.070 |
Risk-based capital required, Well-capitalized ratios, Well-capitalized ratios | 0.080 |
Risk-based capital required, Well-capitalized ratios, Minimum capital ratios, including buffer | 0.085 |
Well-capitalized ratios | 0.100 |
Minimum capital ratios | 0.105 |
Leverage capital required, Well-capitalized ratios | 0.050 |
Leverage capital required, Minimum capital ratios | 0.040 |
Supplementary leverage ratio, Well-capitalized, minimum | 0.030 |

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