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Amortization Expense Related to the Amortizable Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Charged to cost of sales $ 3 $ 4
Charged to amortization of intangibles 19 17
Total amortization $ 22 $ 21