Debt and Other Financing - Schedule of Outstanding Principal Amount and Carrying Value of Notes (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument
Long-term Debt, Total	$ 3,054	$ 3,052
Convertible Debt
Debt Instrument
Long-term Debt, Total	3,054	3,052
Short-term debt	0	0
Convertible Debt | 2022 Notes
Debt Instrument
Principal Amount	3	3
Unamortized Debt Discount	0	0
Long-term Debt, Total	3	3
Convertible Debt | 2024 Notes
Debt Instrument
Principal Amount	575	575
Unamortized Debt Discount	(6)	(6)
Long-term Debt, Total	569	569
Convertible Debt | 2026 Notes
Debt Instrument
Principal Amount	949	949
Unamortized Debt Discount	(9)	(9)
Long-term Debt, Total	940	940
Convertible Debt | 2025 Notes
Debt Instrument
Principal Amount	1,518	1,518
Unamortized Debt Discount	(12)	(13)
Long-term Debt, Total	1,506	1,505
Convertible Debt | 2025 Accreting Notes
Debt Instrument
Principal Amount	36	36
Unamortized Debt Discount	0	(1)
Long-term Debt, Total	36	35
Revolving Credit Facility
Debt Instrument
Long-term Debt, Total	$ 0	$ 0