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Reserves for Losses (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Card Member Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Abstract]    
Card Member receivables evaluated individually for impairment $ 28us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment $ 48us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Reserves on Card Member receivables evaluated individually for impairment 17us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 35us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Card Member receivables evaluated collectively for impairment 43,675us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment 44,803us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Reserves on Card Member receivables evaluated collectively for impairment $ 412us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment $ 430us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment