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Regulatory Matters and Capital Adequacy (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Regulatory Matters And Capital Adequacy [Abstract] |  |
Well-capitalized ratios | 10.00% |
Minimum capital ratios | 9.30% |
Leverage capital required, Well-capitalized ratios | 5.00% |
Leverage capital required, Minimum capital ratios | 4.00% |
Risk-based capital required, Well-capitalized ratios | 8.00% |
Risk-based capital required, Minimum capital ratios | 7.30% |
Common Equity Tier 1 required, Minimum capital ratio | 5.80% |
Common Equity Tier 1 required, Well-capitalized ratios | 6.50% |
Parent Company [Member] |  |
Regulatory capital ratios |  |
Tier 1 capital | $ 14,721 | $ 17,665
Total capital | $ 17,142 | $ 19,893
Tier 1 capital ratio | 10.10% | 13.50%
Total capital ratio | 11.80% | 15.20%
Tier 1 leverage ratio | 8.60% | 11.57%
CET1 capital | $ 13,189 | $ 16,134
CET1 capital ratio | 9.00% | 12.30%
American Express Centurion Bank [Member] |  |
Regulatory capital ratios |  |
Tier 1 capital | $ 5,954 | $ 6,134
Total capital | $ 6,547 | $ 6,600
Tier 1 capital ratio | 12.70% | 16.50%
Total capital ratio | 14.00% | 17.80%
Tier 1 leverage ratio | 10.20% | 16.20%
CET1 capital | $ 5,954 | $ 6,134
CET1 capital ratio | 12.70% | 16.50%
American Express Bank, FSB [Member] |  |
Regulatory capital ratios |  |
Tier 1 capital | $ 6,065 | $ 6,681
Total capital | $ 6,653 | $ 7,194
Tier 1 capital ratio | 12.90% | 16.30%
Total capital ratio | 14.20% | 17.50%
Tier 1 leverage ratio | 11.70% | 13.90%
CET1 capital | $ 6,065 | $ 6,681
CET1 capital ratio | 12.90% | 16.30%

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- Definition Regulatory matters and capital adequacy. + References No definition available. + Details
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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=84167132&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=84167132&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 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 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)(2) -URI http://asc.fasb.org/extlink&oid=84167132&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 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 + Details
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