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Non-Interest Revenue and Expense Detail (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Details Of Certain Statements Of Income Lines Details [Abstract] |  |  |
Marketing and promotion | $ 3,320 axp_MarketingAndPromotion | $ 3,043 axp_MarketingAndPromotion | $ 2,890 axp_MarketingAndPromotion
Card Member rewards | 6,931 axp_CardMemberRewards | 6,457 axp_CardMemberRewards | 6,282 axp_CardMemberRewards
Card Member services and other | 822 axp_CardMemberServices | 767 axp_CardMemberServices | 772 axp_CardMemberServices
Total Marketing, promotion, rewards, Card Member services and other | $ 11,073 axp_MarketingPromotionRewardsAndCardMemberServices | $ 10,267 axp_MarketingPromotionRewardsAndCardMemberServices | $ 9,944 axp_MarketingPromotionRewardsAndCardMemberServices

X
- Definition Represents the costs of rewards programs (including Membership Rewards). + References No definition available. + Details
Name: | axp_CardMemberRewards
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents protection plans and complimentary services provided to Card Members. + References No definition available. + Details
Name: | axp_CardMemberServices
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | axp_DetailsOfCertainStatementsOfIncomeLinesDetailsAbstract
Namespace Prefix: | axp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents advertising costs, which are expensed in the year in which the advertising first takes place. + References No definition available. + Details
Name: | axp_MarketingAndPromotion
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Marketing and promotion expense includes advertising costs. Card Member rewards expense includes the costs of rewards programs (including Membership Rewards). Card Member services expense includes protection plans and complimentary services provided to Card Members. + References No definition available. + Details
Name: | axp_MarketingPromotionRewardsAndCardMemberServices
Namespace Prefix: | axp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration