Debt - Long-Term Debt and Short-Term Borrowings (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Long-term debt and short-term borrowings
Capital lease obligations	$ 158	$ 168
Commercial paper	652	408
Debt, total	2,414	2,176
Less current maturities	(34)	(32)
Long-term debt	2,380	2,144
Senior Notes, interest at 6.75%, maturing 2018 [Member]
Long-term debt and short-term borrowings
Senior Notes	373	372
Senior Notes, interest at 7.15%, maturing 2019 [Member]
Long-term debt and short-term borrowings
Senior Notes	212	209
Senior Notes, interest at 3.125%, maturing 2023 [Member]
Long-term debt and short-term borrowings
Senior Notes	347	346
Senior Notes, interest at 3.75%, maturing 2025 [Member]
Long-term debt and short-term borrowings
Senior Notes	345	344
Senior Notes, interest at 4.50%, maturing 2034 [Member]
Long-term debt and short-term borrowings
Senior Notes	289	289
Mortgages and other, interest rates ranging from non-interest bearing to 3.65%, various maturities [Member]
Long-term debt and short-term borrowings
Other long-term debt	$ 38	$ 40

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 7

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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