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Guarantees (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Maximum potential amount of undiscounted future payments [Member]    
Type of Guarantee    
Return and Merchant Protection $ 40,000 $ 37,000
Other 7,000 8,000
Total 47,000 45,000
Amount of related liability [Member]    
Type of Guarantee    
Return and Merchant Protection 47 44
Other 60 67
Total $ 107 $ 111