Settlement Assets and Obligations (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Cash and cash equivalents	$ 1,300	$ 1,656
Receivables	7,100	10,212
Total settlement assets	8,400	11,868
Payment instruments outstanding	395	345
Card settlements due to merchants	8,005	11,523
Total settlement obligations	$ 8,400	$ 11,868