Prepaid Expenses and Other Assets Schedule of Prepaid Expenses (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Customer and merchant incentives	$ 396	$ 345
Prepaid income taxes	219	72
Other	250	246
Total prepaid expenses and other current assets	$ 865	$ 663