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Regulatory Matters and Capital Adequacy (Tables) | 12 Months Ended
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Dec. 31, 2014
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 |
(Millions, except percentages) |  |  | capital(b) |  |  | capital |  |  | capital |  | capital ratio(b) |  | capital ratio |  | capital ratio |  | leverage ratio |
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 | (c)
December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| American Express Company |  |  | (b) |  | $ | 16,174 |  | $ | 18,585 |  | (b) |  | 12.5 | % | 14.4 | % | 10.9 | %
| American Express Centurion Bank |  |  | (b) |  |  | 6,366 |  |  | 6,765 |  | (b) |  | 19.9 |  | 21.2 |  | 19.0 |
| American Express Bank, FSB |  |  | (b) |  |  | 6,744 |  |  | 7,662 |  | (b) |  | 15.6 |  | 17.7 |  | 17.5 | (c)
Well-capitalized ratios(e) |  |  |  |  |  |  |  |  |  |  | (f) |  | 6.0 | % | 10.0 | % | 5.0 | % (d)
Minimum capital ratios(e) |  |  |  |  |  |  |  |  |  |  | 4.0 | % | 5.5 | % | 8.0 | % | 4.0 | %
Beginning in 2014, as a Basel III Advanced Approaches institution, capital ratios are reported using Basel III capital definitions, inclusive of transition provisions and Basel I risk-weighted assets. As part of the new Basel III capital rule, effective for 2014, Basel III Advanced Approaches institutions are required to disclose Common Equity Tier 1 capital and associated ratio. FSB Tier 1 leverage ratio is calculated using ending total assets in 2013 and average total assets in 2014 as prescribed by OCC regulations applicable to federal savings banks. Represents requirements for banking subs idiaries to be considered “well-capitalized” pursuant to regulations issued under the Federal Deposit Insurance Corporation Improvement Act. There is no “we ll-capitalized” definition for the Tier 1 leverage ratio for a bank holding company. As defined by the regulations issu ed by the Federal Reserve, OCC and FDIC for the year ended December 31, 2014. Beginning J anuary 1, 2015, Basel III CET1 well-capitalized ratios become relevant capital measures under the prompt and corrective action requirements defined by the regulations for Advanced Approaches institutions.

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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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 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 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 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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