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Regulatory Matters and Capital Adequacy (Tables) | 12 Months Ended
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Dec. 31, 2015
Table Text Block [Abstract] |
Regulatory capital ratios | The following table presents the regulatory capital ratios for the Company and the Banks:
|  |  |  | CET1 |  |  | Tier 1 |  |  | Total |  | CET1 |  |  | Tier 1 |  | Total |  | Tier 1 |  |
|  |  |  |  |  |  |  |  |  |  |  | capital |  |  | capital |  | capital |  | leverage |  |
(Millions, except percentages) |  |  | capital |  |  | capital |  |  | capital |  | ratio |  |  | ratio |  | ratio |  | ratio |  |
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 |  |
December 31, 2014:(a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| American Express Company |  | $ | 17,525 |  | $ | 18,176 |  | $ | 20,801 |  | 13.1 | % |  | 13.6 | % | 15.6 | % | 11.8 | % |
| American Express Centurion Bank |  |  | 6,174 |  |  | 6,174 |  |  | 6,584 |  | 18.8 |  |  | 18.8 |  | 20.1 |  | 18.7 |  |
| American Express Bank, FSB |  |  | 6,722 |  |  | 6,722 |  |  | 7,604 |  | 14.2 |  |  | 14.2 |  | 16.0 |  | 15.1 |  |
Well-capitalized ratios(b) |  |  |  |  |  |  |  |  |  |  | 6.5 | % | (c) | 8.0 | % | 10.0 | % | 5.0 | % (d) |
Minimum capital ratios(b) |  |  |  |  |  |  |  |  |  |  | 4.5 | % |  | 6.0 | % | 8.0 | % | 4.0 | % |
Beginning in 2015, as a Basel III Advanced Approaches institution, capital ratios are reported using Basel III capital definitions, inclusive of transition provisions, and risk-weighted assets using the Basel III Standardized Approaches. As of December 31, 2014, capital ratios were reported using Basel III capital definitions, inclusive of transition provisions and Basel I risk-weighted assets. As defined by the regulations issued by the Federal Reserve, OCC and FDIC for the year ended December 31, 2015. Beginning January 1, 2015, Basel III C ET1 well-capitalized ratios beca me relevant capital measures under the prompt and corrective action requirements defined by the regulations for Advanced Approaches institutions. Represents requirements for banking subsidiaries to be considered “well-capitalized” pursuant to regulations i ssued under the Federal Deposit Insurance Corporation Improvement Act. There is no “well-capitalized” definition for the Tier 1 leverage ratio for a bank holding company.

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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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