Long-Term Debt - Summary of Debt Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Financing leases	$ 0	$ 1
Unamortized debt costs	(4)	(2)
Total	346	348
Less: current portion	0	0
Long-term portion	346	348
Senior Notes [Member] \| Senior unsecured notes, maturing 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0	350
Senior Notes [Member] \| Senior unsecured notes, maturing 2029
Debt Instrument [Line Items]
Long-term debt, gross	350	0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 0

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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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 issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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Amount of long-term debt and lease obligation, including portion classified as current.

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