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Debt - Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Commercial paper	$ 1,140
Other	22	$ 23
Total debt	4,305	3,166
Less current portion	151	152
Long-term debt	4,154	3,014
Senior Notes, Interest at 6.125% Payable Semiannually, Principal Due on August 15, 2015 [Member]
Debt Instrument [Line Items]
Senior Notes	151	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.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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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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