Debt - Schedule of Long-Term Debt Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 1,089	$ 1,089
Less: Unamortized debt issuance costs	10	11
Total long term debt net of unamortized debt issuance costs	$ 1,079	1,078
4.875% senior notes due 2027
Debt Instrument [Line Items]
Debt instrument interest rate	4.875%
Total debt	$ 500	500
5.5% senior notes due 2025
Debt Instrument [Line Items]
Debt instrument interest rate	5.50%
Total debt	$ 350	350
Industrial revenue bonds (due 2028 through 2034)
Debt Instrument [Line Items]
Total debt	$ 239	$ 239

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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-Name Accounting Standards Codification
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-Section 50
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- Definition

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

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- Definition

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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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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