Stockholders' Deficit - Schedule of Stockholders' Deficit (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Equity, beginning balance	$ (1,403)	$ (1,352)	$ (1,275)	$ (1,656)	$ (1,312)	$ (1,290)
Redeemable Noncontrolling Interests, beginning balance			541
Comprehensive income (loss)	(67)	(28)	(37)	(35)	(324)	6
Distributions to noncontrolling interests	(17)	(19)	(11)	(12)	(5)	(17)
Purchases of subsidiary shares from noncontrolling interests		5		(1)		(1)
Contributions from noncontrolling interests		1	1	8
Other reclassifications of noncontrolling interests	266
Noncontrolling interest in acquired entity					2
Adjustment to redemption value of redeemable noncontrolling interests	(7)	(14)	(32)	(4)	(20)	(7)
Cancellation of restricted stock for tax withholdings on vested shares			(4)			(8)
Share-based compensation	6	4	6	6	3	5
Equity, ending balance	(1,222)	(1,403)	(1,352)	(1,694)	(1,656)	(1,312)
Redeemable Noncontrolling Interests, ending balance	329
Redeemable Noncontrolling Interests (Non- Equity)
Redeemable Noncontrolling Interests, beginning balance	583	561	541	498	493	480
Comprehensive income (loss)	12	28		30	21
Comprehensive income (loss) attributable to redeemable noncontrolling interest			21			16
Distributions to noncontrolling interests	(8)	(21)		(20)	(39)
Distributions to redeemable noncontrolling interests			(33)			(12)
Purchases of subsidiary shares from noncontrolling interests		(6)	(1)	(1)		1
Contributions from noncontrolling interests			1	1		1
Other reclassifications of redeemable noncontrolling interests	(265)
Noncontrolling interest in acquired entity		7		4	3
Adjustment to redemption value of redeemable noncontrolling interests	7	14	32	4	20	7
Redeemable Noncontrolling Interests, ending balance	329	583	561	516	498	493
Common Stock
Equity, beginning balance	1	1	1	1	1	1
Equity, ending balance	1	1	1	1	1	1
Additional Paid-in Capital
Equity, beginning balance	2,049	2,054	2,084	2,090	2,107	2,118
Purchases of subsidiary shares from noncontrolling interests		5		(1)		(1)
Other reclassifications of noncontrolling interests	122
Adjustment to redemption value of redeemable noncontrolling interests	(7)	(14)	(32)	(4)	(20)	(7)
Cancellation of restricted stock for tax withholdings on vested shares			(4)			(8)
Share-based compensation	6	4	6	6	3	5
Equity, ending balance	2,170	2,049	2,054	2,091	2,090	2,107
Accumulated Other Comprehensive Loss (Income)
Equity, beginning balance	(19)	(18)	(21)	(27)	(22)	(14)
Comprehensive income (loss)	(3)	(1)	3	(6)	(6)	(8)
Other reclassifications of noncontrolling interests	(1)
Equity, ending balance	(23)	(19)	(18)	(33)	(27)	(22)
Accumulated Deficit
Equity, beginning balance	(3,520)	(3,482)	(3,431)	(3,804)	(3,478)	(3,477)
Comprehensive income (loss)	(91)	(38)	(51)	(41)	(326)	(1)
Equity, ending balance	(3,611)	(3,520)	(3,482)	(3,845)	(3,804)	(3,478)
Noncontrolling Interest
Equity, beginning balance	86	93	92	84	80	82
Comprehensive income (loss)	27	11	11	12	7	15
Distributions to noncontrolling interests	(17)	(19)	(11)	(12)	(5)	(17)
Contributions from noncontrolling interests		1	1	8
Other reclassifications of noncontrolling interests	145
Noncontrolling interest in acquired entity					2
Equity, ending balance	$ 241	$ 86	$ 93	$ 92	$ 84	$ 80