Segment and Geographic Information - Net Revenues and Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information
Total net revenue	$ 2,944		$ 2,840	$ 8,889	$ 9,117
Adjusted EBITDA	100		(124)	214	(345)
Less: reconciling items	(263)		(159)	(778)	(635)
Net loss	(163)		(283)	(564)	(980)
Depreciation and amortization	106		94	312	270
Equity-based compensation and related taxes	146		123	464	368
Interest expense, net	5		5	15	19
Other expense, net	4		1	2	0
Provision for income taxes, net	2		1	6	3
Impairment and other related net charges	0		0	14	40
Restructuring charges	0		31	65	31
Gain on debt extinguishment	0		(96)	(100)	(96)
Total reconciling items	263		159	778	635
Senior Note Due 2024 And 2025 | Convertible Debt
Segment Reporting Information
Gain on debt extinguishment		$ (100)	(96)		(96)
2024 Notes | Convertible Debt
Segment Reporting Information
Repurchase of aggregate principal amount		83	375		375
2025 Notes | Convertible Debt
Segment Reporting Information
Repurchase of aggregate principal amount		$ 535	229		229
Customer Service Centers
Segment Reporting Information
Tangible asset impairment charges				5
Construction in progress
Segment Reporting Information
Tangible asset impairment charges				9
U.S.
Segment Reporting Information
Total net revenue	2,572		2,440	7,772	7,778
Adjusted EBITDA	123		(51)	313	(109)
International
Segment Reporting Information
Total net revenue	372		400	1,117	1,339
Adjusted EBITDA	$ (23)		$ (73)	$ (99)	$ (236)