Debt - Long-Term Debt and Short-Term Borrowings (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Long-term debt and short-term borrowings
Revolving Credit Facility, maturing 2020	$ 1us-gaap_LineOfCredit	$ 5us-gaap_LineOfCredit
Capital lease obligations	159us-gaap_CapitalLeaseObligations	156us-gaap_CapitalLeaseObligations
Commercial paper	462us-gaap_CommercialPaper	634us-gaap_CommercialPaper
Debt, total	2,528us-gaap_DebtAndCapitalLeaseObligations	2,695us-gaap_DebtAndCapitalLeaseObligations
Less current maturities	(297)us-gaap_DebtCurrent	(297)us-gaap_DebtCurrent
Long-term debt	2,231	2,398
Debt, total	2,528us-gaap_DebtAndCapitalLeaseObligations	2,695us-gaap_DebtAndCapitalLeaseObligations
Senior Notes, interest at 7.375%, maturing 2015 [Member]
Long-term debt and short-term borrowings
Senior Notes	294	294
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	211	209
Senior Notes, interest at 3.125%, maturing 2023 [Member]
Long-term debt and short-term borrowings
Senior Notes	349	349
Senior Notes, interest at 3.75%, maturing 2025 [Member]
Long-term debt and short-term borrowings
Senior Notes	346	346
Senior Notes, interest at 4.5%, maturing 2034 [Member]
Long-term debt and short-term borrowings
Senior Notes	291	291
Mortgages and other, interest rates ranging from non-interest bearing to 3.65%, various maturities [Member]
Long-term debt and short-term borrowings
Long-term debt	$ 42	$ 39

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.

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- 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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Topic 210

-SubTopic 10

-Section S99

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SX 210.7-03.16)

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- Definition

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.

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-Publisher FASB

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Publisher FASB

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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

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-Publisher FASB

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-Number Topic 6

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- Definition

Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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-Paragraph 19, 20, 22

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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-Publisher FASB

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