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Summarization of Bases Used to Measure Fair Value of Financial Instruments (Detail) - Approximate fair values - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments | $ 43 | $ 31
Total assets | 43 | 31
Current maturities of long-term debt and lease obligations | 3 | 3
Long-term debt and lease obligations | 3,595 | 2,756
Total liabilities | 3,598 | 2,759
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current maturities of long-term debt and lease obligations | 3 | 3
Long-term debt and lease obligations | 3,595 | 2,756
Total liabilities | 3,598 | 2,759
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments | 43 | 31
Total assets | $ 43 | $ 31

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- Definition Long term debt and capital lease obligations current fair value disclosure. + References No definition available. + Details
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- Definition Long term debt and capital lease obligations fair value disclosure. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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