Settlement Assets and Obligations (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Cash and cash equivalents	$ 2,759	$ 1,656
Receivables	10,228	10,212
Total settlement assets	12,987	11,868
Payment instruments outstanding	423	345
Card settlements due to merchants	12,564	11,523
Total settlement obligations	$ 12,987	$ 11,868