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Long-term Debt - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt, fair value	$ 9,200,000,000us-gaap_DebtInstrumentFairValue	$ 10,700,000,000us-gaap_DebtInstrumentFairValue
Long-term debt - current portion	3,180,000,000us-gaap_LongTermDebtCurrent	1,244,000,000us-gaap_LongTermDebtCurrent
Commercial paper borrowings
Debt Instrument [Line Items]
Long-term debt	2,000,000,000	1,500,000,000
Long-term debt - current portion	$ 1,600,000,000

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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