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Regulatory Matters and Capital Adequacy (Details) $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Regulatory Matters And Capital Adequacy |  |
Common Equity Tier 1 required, Minimum capital ratio | 0.045 |
Risk-based capital required, 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 | $ 20,030 | $ 17,554
Tier 1 capital | 21,627 | 19,186
Total capital | $ 24,926 | $ 21,506
CET1 capital ratio | 0.103 | 0.105
Tier 1 capital ratio | 0.111 | 0.115
Total capital ratio | 0.128 | 0.129
Tier 1 leverage ratio | 0.099 | 0.105
Regulatory Matters And Capital Adequacy |  |
Common Equity Tier 1 Required, Basel III Standards 2021 | 0.070 |
Risk-based capital required, Well-capitalized ratios | 0.060 |
Tier 1 capital ratio, effective minimum | 0.085 |
Well-capitalized ratios | 0.100 |
Basel III Standards 2021 | 0.105 |
Leverage Capital Required, Basel III Standards 2020 | 0.040 |
Subsidiaries | American Express National Bank |  |
Regulatory capital ratios |  |
CET1 capital | $ 14,820 | $ 13,085
Tier 1 capital | 14,820 | 13,085
Total capital | $ 17,273 | $ 15,283
CET1 capital ratio | 0.113 | 0.118
Tier 1 capital ratio | 0.113 | 0.118
Total capital ratio | 0.132 | 0.137
Tier 1 leverage ratio | 0.097 | 0.105
Regulatory Matters And Capital Adequacy |  |
Common Equity Tier 1 required, Well-capitalized ratios | 0.065 |
Common Equity Tier 1 Required, Basel III Standards 2021 | 0.070 |
Risk-based capital required, Well-capitalized ratios | 0.080 |
Tier 1 capital ratio, effective minimum | 0.085 |
Well-capitalized ratios | 0.100 |
Basel III Standards 2021 | 0.105 |
Leverage capital required, Well-capitalized ratios | 0.050 |
Leverage Capital Required, Basel III Standards 2020 | 0.040 |

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- Definition CET1 well capitalized ratio as defined by the regulations issued by the Federal Reserve, OCC and FDIC + References No definition available. + Details
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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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