Book Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Long-term debt and lease obligations	$ 2,068	$ 3,922
Book Values
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Investments	22	21
Short-term debt	817	1,775
Current maturities of long-term debt and lease obligations	472	810
Long-term debt and lease obligations	2,068	3,922
Approximate fair values
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Investments	22	21
Short-term debt	817	1,775
Current maturities of long-term debt and lease obligations	475	818
Long-term debt and lease obligations	$ 2,232	$ 4,077

Cost method investments and held to maturity debt securities fair value disclosure.

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- Definition

Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]

+ References

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- Definition

Long term debt and capital lease obligations current fair value disclosure.

+ References

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section H

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

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