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Guarantees (Details) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Type of Guarantee    
Maximum amount of undiscounted future payments $ 70,000,000,000 $ 68,000,000,000
Amount of related liability 218,000,000 213,000,000
Card and Travel Operations [Member]
   
Type of Guarantee    
Maximum amount of undiscounted future payments 69,000,000,000 67,000,000,000
Amount of related liability 114,000,000 114,000,000
Other Guarantees [Member]
   
Type of Guarantee    
Maximum amount of undiscounted future payments 1,000,000,000 1,000,000,000
Amount of related liability $ 104,000,000 $ 99,000,000