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Reserves for Losses (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Changes in the Card Member loans reserve for losses |  |  |
Balance, January 1 | $ 1,261 us-gaap_LoansAndLeasesReceivableAllowance | $ 1,471 us-gaap_LoansAndLeasesReceivableAllowance | $ 1,874 us-gaap_LoansAndLeasesReceivableAllowance
Card Member loans provisions | 1,138 axp_ProvisionsForLossesForLoanAndLeaseLossesAdditionsPrincipalInterestAndFees | 1,115 axp_ProvisionsForLossesForLoanAndLeaseLossesAdditionsPrincipalInterestAndFees | 1,030 axp_ProvisionsForLossesForLoanAndLeaseLossesAdditionsPrincipalInterestAndFees
Card Member loans net write-offs - principal | (1,023)axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsPrincipal | (1,141)axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsPrincipal | (1,280)axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsPrincipal
Card Member loans net write-offs - interest and fees | (164)axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsInterestAndFees | (150)axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsInterestAndFees | (157)axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsInterestAndFees
Card Member loans - other | (11)axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsOther | (34)axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsOther | 4 axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsOther
Balance, December 31 | $ 1,201 us-gaap_LoansAndLeasesReceivableAllowance | $ 1,261 us-gaap_LoansAndLeasesReceivableAllowance | $ 1,471 us-gaap_LoansAndLeasesReceivableAllowance

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- Definition Reflects the interest and fees amount of loans that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities for the period. + References No definition available. + Details
Name: | axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsInterestAndFees
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents adjustments to Card Member loans reserve including foreign currency translation adjustments and net write-offs related to unauthorized transactions for the period. + References No definition available. + Details
Name: | axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsOther
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reflects the principal amount of loans that have been removed, or charged off, from both loan receivables and the reserve for credit losses, net of recoveries, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities for the period. + References No definition available. + Details
Name: | axp_ProvisionsForLoansAndLeaseLossesDeductionsNetWriteOffsPrincipal
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents loss provisions for Card Member loans consisting of principal (resulting from authorized transactions), interest and fee reserves components for the period. + References No definition available. + Details
Name: | axp_ProvisionsForLossesForLoanAndLeaseLossesAdditionsPrincipalInterestAndFees
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 210.9-03.7(d)) -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 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant