Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents		$ 2,361	$ 1,650	$ 1,245
Settlement activity, net	[1]	$ 711	405	182
Affiliated Entity
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents			$ 175	411
First Data
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents				$ 922

[1] The company revised the consolidated statements of cash flows presentation to include cash and cash equivalents within settlement assets as a component of total cash and cash equivalents. The company revised the 2020 and 2019 presentation for comparable purposes. Additional information is included in Note 1.