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Fair Value Measurements - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Financial Instruments [Line Items]
Estimated fair value of long-term debt, including the current portion	$ 1.69	$ 1.63	$ 1.67
Carrying value of long-term debt	$ 1.65	$ 1.50	$ 1.55

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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