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Long-Term Debt - Long-term Debt Denominated by Currencies (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Debt	$ 1,301	$ 1,159
U.S. dollar [Member]
Debt Instrument [Line Items]
Long-term Debt	689	694
Euro [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 612	$ 465

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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