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Regulatory Matters and Capital Adequacy (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Regulatory Matters And Capital Adequacy [Abstract] |  |
Well-capitalized ratios | 10.00% | 10.00%
Minimum capital ratios | 8.00% | 8.00%
Leverage capital required, Well-capitalized ratios | 5.00% | 5.00%
Leverage capital required, Minimum capital ratios | 4.00% | 4.00%
Risk-based capital required, Well-capitalized ratios | 6.00% | 6.00%
Risk-based capital required, Minimum capital ratios | 4.00% | 4.00%
Parent Company [Member] |  |
Regulatory capital ratios |  |
Tier 1 capital | $ 16,174 | $ 14,920
Total capital | 18,585 | 17,349
Tier 1 capital ratio | 12.50% | 11.90%
Total capital ratio | 14.40% | 13.80%
Tier 1 leverage ratio | 10.90% | 10.20%
American Express Centurion Bank [Member] |  |
Regulatory capital ratios |  |
Tier 1 capital | 6,366 | 5,814
Total capital | 6,765 | 6,227
Tier 1 capital ratio | 19.90% | 17.60%
Total capital ratio | 21.20% | 18.90%
Tier 1 leverage ratio | 19.00% | 17.00%
American Express Bank, FSB [Member] |  |
Regulatory capital ratios |  |
Tier 1 capital | 6,744 | 6,649
Total capital | $ 7,662 | $ 7,556
Tier 1 capital ratio | 15.60% | 16.50%
Total capital ratio | 17.70% | 18.70%
Tier 1 leverage ratio | 17.50% | 17.50%

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 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=7881181&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + 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=7881181&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=7881181&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=7881181&loc=SL5958570-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + 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=7881181&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=7881181&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=7881181&loc=SL5958570-112826 + Details
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