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Regulatory Matters and Capital Adequacy (Tables) | 12 Months Ended
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Dec. 31, 2016
Table Text Block [Abstract] |
Regulatory capital ratios | The following table presents the regulatory capital ratios for the Company and the Banks:
(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 |  |
December 31, 2016:(a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| American Express Company |  | $ | 16,134 |  | $ | 17,665 |  | $ | 19,893 |  | 12.3 | % |  | 13.5 | % | 15.2 | % | 11.6 | % |
| American Express Centurion Bank |  |  | 6,134 |  |  | 6,134 |  |  | 6,600 |  | 16.5 |  |  | 16.5 |  | 17.8 |  | 16.2 |  |
| American Express Bank, FSB |  |  | 6,681 |  |  | 6,681 |  |  | 7,194 |  | 16.3 |  |  | 16.3 |  | 17.5 |  | 13.9 |  |
December 31, 2015:(a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| American Express Company |  | $ | 16,747 |  | $ | 18,265 |  | $ | 20,551 |  | 12.4 | % |  | 13.5 | % | 15.2 | % | 11.7 | % |
| American Express Centurion Bank |  |  | 6,013 |  |  | 6,013 |  |  | 6,460 |  | 16.9 |  |  | 16.9 |  | 18.2 |  | 17.7 |  |
| American Express Bank, FSB |  |  | 6,927 |  |  | 6,927 |  |  | 7,601 |  | 13.7 |  |  | 13.7 |  | 15.1 |  | 13.2 |  |
Well-capitalized ratios(b) |  |  |  |  |  |  |  |  |  |  | 6.5 | % |  | 8.0 | % | 10.0 | % | 5.0 | % (c) |
Minimum capital ratios(b) |  |  |  |  |  |  |  |  |  |  | 4.5 | % |  | 6.0 | % | 8.0 | % | 4.0 | % |
A s a Basel III advanced approaches institution in parallel run, capital ratios are reported using Basel III capital definitions, inclusive of transition provisions, and risk-weighted assets using the Basel III standardized approach. As defined by the regulations issued by the Federal Reserve, OCC and FDIC for the year ended December 31, 2016. Represents requirements for banking subsidiaries to be considered “well-capitalized” pursuant to regulations issued under the Federal Deposit Insurance Corpora tion Improvement Act. There is no CET1 capital ratio or Tier 1 leverage ratio requirement for a bank holding company to be considered “well-capitalized.”

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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=35709795&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=35709795&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=35709795&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=35709795&loc=SL5958577-112826 + Details
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