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Financial Instruments, Hedging Activities and Fair Value Measurements (Fair Value Additional Information) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure	$ 46	$ 8
Long-term debt	3,877us-gaap_LongTermDebt	3,346us-gaap_LongTermDebt
Long-term debt (excluding capital lease obligations), fair values	$ 4,164us-gaap_DebtInstrumentFairValue	$ 3,683us-gaap_DebtInstrumentFairValue

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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