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Assets and Liabilities Measured at Fair Value - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Estimated fair value of long-term debt	$ 29,492	$ 30,781
Carrying amounts of long-term debt	$ 28,377	$ 28,930

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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