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Customer Deposits (Details 1) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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U.S. retail deposits: |  |
Savings accounts - Direct | $ 26,159 us-gaap_InterestBearingDomesticDepositSavings | $ 24,550 us-gaap_InterestBearingDomesticDepositSavings
Certificates of deposit - Direct | 333 us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits | 489 us-gaap_InterestBearingDomesticDepositCertificatesOfDeposits
Certificates of deposit - Third party | 7,838 axp_ThirdPartyCertificatesOfDeposit | 6,929 axp_ThirdPartyCertificatesOfDeposit
Sweep accounts - Third party | 8,949 axp_ThirdPartySweepAccounts | 8,863 axp_ThirdPartySweepAccounts
Non-U.S. deposits and U.S. non-interest bearing | 173 us-gaap_InterestBearingDomesticDepositOtherTimeDeposit | 155 us-gaap_InterestBearingDomesticDepositOtherTimeDeposit
Card Member credit balances - U.S. and non-U.S. | 719 axp_DomesticAndForeignCardMemberCreditBalances | 777 axp_DomesticAndForeignCardMemberCreditBalances
Total customer deposits | $ 44,171 us-gaap_Deposits | $ 41,763 us-gaap_Deposits

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- Definition Card Member credit balances (U.S. and non-U.S.) reclassified into Other Liabilities + References No definition available. + Details
Name: | axp_DomesticAndForeignCardMemberCreditBalances
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents third party certificate of deposit accounts offered by the Company's Banks. + References No definition available. + Details
Name: | axp_ThirdPartyCertificatesOfDeposit
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents third party sweep accounts offered by the Company's Banks. + References No definition available. + Details
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Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Details
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Balance Type: | na
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- Definition Amount of interest-bearing domestic certificate of deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of interest-bearing domestic deposit liabilities for time deposit liabilities other than certificates of deposit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of interest-bearing domestic savings deposit liabilities. Saving deposits bear interest and have no stated maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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