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Guarantees (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Type of Guarantee    
Maximum potential amount of undiscounted future payments $ 45,000,000,000 $ 45,000,000,000
Amount of related liability 125,000,000 161,000,000
Card and Travel Operations [Member]
    
Type of Guarantee    
Maximum potential amount of undiscounted future payments 44,000,000,000 44,000,000,000
Amount of related liability 45,000,000 88,000,000
Other Guarantees [Member]
    
Type of Guarantee    
Maximum potential amount of undiscounted future payments 1,000,000,000 1,000,000,000
Amount of related liability $ 80,000,000 $ 73,000,000