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Regulatory Matters and Capital Adequacy (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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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 |
Parent Company | American Express Company |  |
Regulatory capital ratios |  |
CET1 capital | $ 23,174 | $ 20,030
Tier 1 capital | 24,779 | 21,627
Total capital | $ 28,784 | $ 24,926
CET1 capital ratio | 0.105 | 0.103
Tier 1 capital ratio | 0.113 | 0.111
Total capital ratio | 0.131 | 0.128
Tier 1 leverage ratio | 0.099 | 0.099
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 |
Subsidiaries | American Express National Bank |  |
Regulatory capital ratios |  |
CET1 capital | $ 17,038 | $ 14,820
Tier 1 capital | 17,038 | 14,820
Total capital | $ 19,548 | $ 17,273
CET1 capital ratio | 0.116 | 0.113
Tier 1 capital ratio | 0.116 | 0.113
Total capital ratio | 0.133 | 0.132
Tier 1 leverage ratio | 0.095 | 0.097
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 |

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- Definition Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B + Details
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