CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE NON-CONTROLLING 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
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
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
Equity, including portion attributable to noncontrolling interest, ending balance at Mar. 31, 2024	4,085		$ 0	8,578	(121)	(4,378)	6
Redeemable noncontrolling interests, beginning balance at Dec. 31, 2024		75
Beginning balance (in shares) at Dec. 31, 2024			1,801
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
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
Equity, including portion attributable to noncontrolling interest, ending balance at Mar. 31, 2025	$ 4,374		$ 0	$ 8,898	$ (404)	$ (4,122)	$ 2