Nature of Operations and Summary of Significant Accounting Policies - Reconciliation of Cash (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Cash and cash equivalents	$ 629	$ 483	$ 538	$ 711
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	23	52	0	0
Restricted cash	10	10	10	4
Restricted cash included in Other assets	0	7	7	1
Cash, cash equivalents and restricted cash	$ 662	$ 552	$ 555	$ 716