Basis of Presentation and Summary of Significant Accounting Policies - Cash and Cash equivalents (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Accounting Policies [Abstract]
Cash and cash equivalents	$ 675	$ 505	$ 434
Restricted Cash and Cash Equivalents, Current, Statement of Financial Position [Extensible Enumeration]	Restricted cash, current		Restricted cash, current
Short term restricted cash	$ 30		$ 7
Long term restricted cash	2,068		9
Funds held for client	0		42
Cash included in settlement processing assets	240		253
Total cash, cash equivalents and restricted cash	$ 3,013		$ 745