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Debt - Schedule of Notes (Details) - Convertible Senior Notes - 4% Convertible Senior Dotes due 2024 - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal amount (face value)	$ 207	$ 207
Unamortized issuance cost	(3)	(4)
Unamortized debt discount	(30)	(33)
Net Carrying value	$ 174	$ 170

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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