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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Fair Value Measurements [Line Items]
Minimum days to maturity of investments	90 days
Long-term debt, fair value	$ 19,672.1
Total Debt	$ 20,758.5	$ 19,799.9

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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