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Assets and Liabilities Measured at Fair Value - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Estimated fair value of long-term debt	$ 29,369	$ 29,603
Carrying amounts of long-term debt	$ 28,470	$ 28,376

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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