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Fair Value Measurements - Financial Instruments at Fair Value, Excluding Derivative Financial Instruments and Contingent Consideration (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |  |
Financial assets: |  |  |
Environmental receivables and misc. deposits |  | $ 18 | $ 17
Total financial assets |  | 18 | 17
Financial liabilities: |  |  |
Long-term debt | [1] | 17,893 | 13,893
Deferred credits and other liabilities |  | 118 | 122
Total financial liabilities |  | 18,011 | 14,015
Carrying Value |  |  |
Financial assets: |  |  |
Environmental receivables and misc. deposits |  | 18 | 17
Total financial assets |  | 18 | 17
Financial liabilities: |  |  |
Long-term debt | [1] | 17,010 | 12,642
Deferred credits and other liabilities |  | 108 | 109
Total financial liabilities |  | $ 17,118 | $ 12,751
[1] | Excludes capital leases and debt issuance costs; includes amount classified as debt due within one year.

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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 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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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Fair value portion of other liabilities. + References No definition available. + Details
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