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Schedule of Long-Term Obligations (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Dec. 01, 2017
Notes payable
Debt Instrument
Weighted average interest rates	1.40%	1.40%
Other Long Term Debt
Debt Instrument
Weighted average interest rates	1.90%	1.70%
Credit Agreement
Debt Instrument
Weighted average interest rates	2.20%	2.20%
Current maturities of credit agreement	$ 22	$ 18
Minimum increment | Credit Agreement
Debt Instrument
Change in Increments in Commitment Fee			0.025%

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- Definition

The increment amount by which the applicable commitment fee will increase/decrease depending on the total leverage ratio.

+ References

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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

Weighted average interest rate of debt outstanding.

+ References

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- Definition

Carrying value as of the balance sheet date of the portion of long-term, collateralized debt obligations due within one year or the operating cycle, if longer. Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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