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Regulatory Matters and Capital Adequacy (Tables) | 9 Months Ended
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Sep. 30, 2018
Table Text Block [Abstract] |
Regulatory capital ratios | The following table presents the regulatory capital rati os:
(Millions, except percentages) |  |  | CET 1 capital |  |  | Tier 1 capital |  |  | Total capital |  | CET 1 capital ratio |  |  | Tier 1 capital ratio |  | Total capital ratio |  | Tier 1 leverage ratio |  | Supplementary leverage ratio |
September 30, 2018:(a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| American Express Company |  | $ | 16,636 |  | $ | 18,208 |  | $ | 20,737 |  | 10.8 | % |  | 11.8 | % | 13.4 | % | 10.1 | % | 8.6 | %
| American Express National Bank |  | $ | 11,504 |  | $ | 11,504 |  | $ | 13,465 |  | 12.5 | % |  | 12.5 | % | 14.6 | % | 10.0 | % | 8.3 | %
December 31, 2017:(a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| American Express Company |  | $ | 13,189 |  | $ | 14,721 |  | $ | 17,142 |  | 9.0 | % |  | 10.1 | % | 11.8 | % | 8.6 | % | (b) | %
| American Express Centurion Bank |  | $ | 5,954 |  | $ | 5,954 |  | $ | 6,547 |  | 12.7 | % |  | 12.7 | % | 14.0 | % | 10.2 | % | (b) | %
| American Express Bank, FSB |  | $ | 6,065 |  | $ | 6,065 |  | $ | 6,653 |  | 12.9 | % |  | 12.9 | % | 14.2 | % | 11.7 | % | (b) | %
Well capitalized ratios(c) |  |  |  |  |  |  |  |  |  |  | 6.5 | % |  | 8.0 | % | 10.0 | % | 5.0 | % | N/A |
Basel III Standards 2018(d) |  |  |  |  |  |  |  |  |  |  | 6.4 | % |  | 7.9 | % | 9.9 | % | 4.0 | % | 3.0 | %
Minimum capital ratios(e) |  |  |  |  |  |  |  |  |  |  | 4.5 | % |  | 6.0 | % | 8.0 | % | 4.0 | % | 3.0 | %
As a Basel III advanced approaches institution in parallel run, capital ratios are reported using Basel III capital definitions, inclusive of transition provisions for the capital ratios as of December 31, 2017, and risk-weighted assets using the Basel III standardized approach. The minimum supplementary leverage ratio (SLR) requirement of 3 percent became effective January 1, 2018. Represents requirements for banking subs idiaries to be considered “well capital ized” pursuant to regulations issued under the Federal Deposit Insurance Corporation Improvement Act. There is no CET1 capital ratio, Tier 1 leverage ratio or SLR requirement for a bank holding company to be considered “well capitalized.” Basel III minimum capital requirement and additional transitional capital conservation buffer as defined by the Federal Reserve and OCC for calendar year 2018 for advanced approaches institutions. The additional capital conservation buffer does not apply to Tier 1 leverage ratio or SLR. As defined by the regulations issued by the Federal Reserve and OCC.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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