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Long-Term Debt - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	May 29, 2013 Commercial Paper Maximum
Debt Instrument [Line Items]
Debt instrument, principal amount outstanding			$ 750,000,000
Commercial paper notes	$ 363,000,000	$ 0
Weighted average interest rate	0.32%
Weighted average maturity period	41 days

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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