Debt - Schedule of Notes (Details) - 4% Convertible Senior Notes Due 2024 - Convertible Notes Payable - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	May 28, 2019
Debt Instrument [Line Items]
Principal amount (face value)	$ 207	$ 207
Unamortized issuance cost	(3)	(4)
Unamortized debt discount	(25)	(33)
Net Carrying value	$ 179	$ 170
Debt instrument, interest rate			4.00%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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