Condensed Financial Information of Parent Company - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net cash used in operating activities	$ 210	$ 300	$ (131)
Cash flows from investing activities:
Net cash provided by (used in) investing activities	(26)	(259)	(524)
Cash flows from financing activities:
Repurchase of restricted stock shares for payroll tax withholding requirements	(4)	(8)	(5)
Net cash used in financing activities	(264)	(430)	(514)
Net change in cash and cash equivalents	(80)	(389)	(1,169)
Cash and cash equivalents at beginning of period	38	118	507	$ 1,676
Parent Company
Cash flows from operating activities:
Net cash used in operating activities	(85)	(13)	(11)
Cash flows from financing activities:
Repurchase of restricted stock shares for payroll tax withholding requirements	(4)	(8)	(5)
Changes in intercompany balances with affiliates, net	89	21	16
Net cash used in financing activities	$ 85	$ 13	$ 11