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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Minimum days to maturity of investments	90 days
Long-term debt, fair value	$ 21,499.1
Carrying value of outstanding debt	$ 21,277.1	$ 21,412.1

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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