CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY (unaudited) - USD ($) shares in Millions, $ in Millions	Total	Redeemable Noncontrolling Interests	Class A and Class B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interests
Redeemable noncontrolling interests, beginning balance at Dec. 31, 2023		$ 15
Beginning balance (in shares) at Dec. 31, 2023			1,791.0
Equity, including portion attributable to noncontrolling interest, beginning balance at Dec. 31, 2023	$ 4,089		$ 0	$ 8,489	$ (17)	$ (4,383)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(25)
Net (loss) income	1					5	(4)
Capital contributions from noncontrolling interest holders	0	55
Recognition of noncontrolling interest upon acquisition	10	69					10
Foreign currency translation adjustments, net of tax	(105)				(105)
Actuarial gain on defined severance benefits, net of tax	1				1
Issuance of common stock upon exercise of stock options	1			1
Issuance of common stock upon settlement of restricted stock units (in shares)			4.0
Issuance of common stock upon settlement of restricted stock units	0
Equity-based compensation	88			88
Redeemable noncontrolling interests, ending balance at Mar. 31, 2024		114
Ending balance (in shares) at Mar. 31, 2024			1,795.0
Equity, including portion attributable to noncontrolling interest, ending balance at Mar. 31, 2024	4,085		$ 0	8,578	(121)	(4,378)	6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(21)
Net (loss) income	(84)					(77)	(7)
Foreign currency translation adjustments, net of tax	(79)	(1)			(79)
Actuarial gain on defined severance benefits, net of tax	2				2
Issuance of common stock upon exercise of stock options (in shares)			1.0
Issuance of common stock upon exercise of stock options	0
Issuance of common stock upon settlement of restricted stock units (in shares)			4.0
Issuance of common stock upon settlement of restricted stock units	0
Repurchase of Class A common stock (in shares)			(10.0)
Repurchase of Class A common stock	(178)			(178)
Equity-based compensation	109			109
Redeemable noncontrolling interests, ending balance at Jun. 30, 2024		92
Ending balance (in shares) at Jun. 30, 2024			1,790.0
Equity, including portion attributable to noncontrolling interest, ending balance at Jun. 30, 2024	3,855		$ 0	8,509	(198)	(4,455)	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(11)
Net (loss) income	75					70	5
Foreign currency translation adjustments, net of tax	146	3			146
Actuarial gain on defined severance benefits, net of tax	1				1
Issuance of common stock upon exercise of stock options	2			2
Issuance of common stock upon settlement of restricted stock units (in shares)			5.0
Issuance of common stock upon settlement of restricted stock units	0
Equity-based compensation	114			114
Redeemable noncontrolling interests, ending balance at Sep. 30, 2024		84
Ending balance (in shares) at Sep. 30, 2024			1,795.0
Equity, including portion attributable to noncontrolling interest, ending balance at Sep. 30, 2024	4,193		$ 0	8,625	(51)	(4,385)	4
Redeemable noncontrolling interests, beginning balance at Dec. 31, 2024		75
Beginning balance (in shares) at Dec. 31, 2024			1,801.0
Equity, including portion attributable to noncontrolling interest, beginning balance at Dec. 31, 2024	4,102		$ 0	8,736	(404)	(4,229)	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		4
Net (loss) income	110					107	3
Foreign currency translation adjustments, net of tax	(2)	(3)			(2)
Actuarial gain on defined severance benefits, net of tax	2				2
Issuance of common stock upon settlement of restricted stock units (in shares)			6.0
Issuance of common stock upon settlement of restricted stock units	0
Re-measurement of noncontrolling interest	(3)	3		(3)
Equity-based compensation	121			121
Acquisition of noncontrolling interest	44	(51)		44
Dividends paid to noncontrolling interest	0	(4)
Redeemable noncontrolling interests, ending balance at Mar. 31, 2025		24
Ending balance (in shares) at Mar. 31, 2025			1,807.0
Equity, including portion attributable to noncontrolling interest, ending balance at Mar. 31, 2025	4,374		$ 0	8,898	(404)	(4,122)	2
Redeemable noncontrolling interests, beginning balance at Dec. 31, 2024		75
Beginning balance (in shares) at Dec. 31, 2024			1,801.0
Equity, including portion attributable to noncontrolling interest, beginning balance at Dec. 31, 2024	$ 4,102		$ 0	8,736	(404)	(4,229)	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Class A common stock (in shares)	(2.8)
Repurchase of Class A common stock	$ (81)
Ending balance (in shares) at Sep. 30, 2025			1,823.0
Equity, including portion attributable to noncontrolling interest, ending balance at Sep. 30, 2025	4,741		$ 0	9,063	(327)	(3,995)	0
Redeemable noncontrolling interests, beginning balance at Mar. 31, 2025		24
Beginning balance (in shares) at Mar. 31, 2025			1,807.0
Equity, including portion attributable to noncontrolling interest, beginning balance at Mar. 31, 2025	4,374		$ 0	8,898	(404)	(4,122)	2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	31					32	(1)
Foreign currency translation adjustments, net of tax	153				153
Actuarial gain on defined severance benefits, net of tax	3				3
Issuance of common stock upon exercise of stock options (in shares)			1.0
Issuance of common stock upon exercise of stock options	3			3
Issuance of common stock upon settlement of restricted stock units (in shares)			6.0
Issuance of common stock upon settlement of restricted stock units	0
Equity-based compensation	113			113
Acquisition of noncontrolling interest	8	$ (24)		11	(2)		(1)
Acquisition of noncontrolling interest (in shares)			5.0
Ending balance (in shares) at Jun. 30, 2025			1,819.0
Equity, including portion attributable to noncontrolling interest, ending balance at Jun. 30, 2025	4,685		$ 0	9,025	(250)	(4,090)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	95					95
Foreign currency translation adjustments, net of tax	(79)				(79)
Actuarial gain on defined severance benefits, net of tax	2				2
Issuance of common stock upon exercise of stock options (in shares)			1.0
Issuance of common stock upon exercise of stock options	1			1
Issuance of common stock upon settlement of restricted stock units (in shares)			6.0
Issuance of common stock upon settlement of restricted stock units	$ 0
Repurchase of Class A common stock (in shares)	(2.8)		(3.0)
Repurchase of Class A common stock	$ (81)			(81)
Equity-based compensation	118			118
Ending balance (in shares) at Sep. 30, 2025			1,823.0
Equity, including portion attributable to noncontrolling interest, ending balance at Sep. 30, 2025	$ 4,741		$ 0	$ 9,063	$ (327)	$ (3,995)	$ 0