Debt - Total Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,089	$ 1,089
Less: Unamortized debt issuance costs	10	11
Total	1,079	1,078
4.875% senior notes due 2027
Debt Instrument [Line Items]
Long-term debt, gross	$ 500	500
Less: Unamortized debt issuance costs		$ 7
Stated interest rate	4.875%	4.875%
5.5% senior notes due 2025
Debt Instrument [Line Items]
Long-term debt, gross	$ 350	$ 350
Stated interest rate	5.50%	5.50%
Industrial revenue bonds (due 2028 through 2034)
Debt Instrument [Line Items]
Long-term debt, gross	$ 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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-SubTopic 20
-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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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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