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Segment and Geographic Information - Footnotes (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 04, 2026	Apr. 30, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting
Impairment and other related net charges						$ 23
Impairment and other related net charges			$ 2	$ 0	$ 2	23
Impairment of right-of-use assets						3
Restructuring and other charges, net				9		65
Gain (loss) on debt extinguishment			(59)	6	(102)	31
2026 Notes \| Convertible Debt
Segment Reporting
Repurchase of aggregate principal amount				696		696
2028 Notes \| Convertible Debt
Segment Reporting
Gain (loss) on debt extinguishment	$ (43)	$ (59)
Repurchase of aggregate principal amount	$ 56	$ 89	$ 145		$ 145
Senior Note Due 2025 \| Convertible Debt
Segment Reporting
Repurchase of aggregate principal amount				80		80
Germany Restructuring
Segment Reporting
Impairment and other related net charges						20
Restructuring and other charges, net				6		46
Workforce Reduction
Segment Reporting
Restructuring and other charges, net				$ 3		$ 19