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Debt - Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Other	$ 45	$ 23
Total debt	3,930	3,166
Less current portion	2	152
Long-term debt	3,928	3,014
Total debt	3,930	3,166
Five-year Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Commercial paper	893
Senior Notes, Interest at 6.125% Payable Semiannually, Principal Due on August 15, 2015 [Member]
Debt Instrument [Line Items]
Senior Notes		151
Senior Notes, Interest at 1.35% Payable Semiannually, Principal Due on December 1, 2017 [Member]
Debt Instrument [Line Items]
Senior Notes	500	500
Senior Notes, Interest at 2.6% Payable Semiannually, Principal Due on December 1, 2022 [Member]
Debt Instrument [Line Items]
Senior Notes	1,396	1,396
Senior Notes, Interest at 3.95% Payable Semiannually, Principal Due on December 1, 2042 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 1,096	$ 1,096

X

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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No definition available.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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/presentationRef
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-Name Accounting Standards Codification
-Topic 942
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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+ References

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+ References

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+ References

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