Settlement Assets and Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Cash and cash equivalents	$ 1,386	$ 1,656
Receivables	8,017	10,212
Total settlement assets	9,403	11,868
Payment instruments outstanding	391	345
Card settlements due to merchants	9,012	11,523
Total settlement obligations	$ 9,403	$ 11,868