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Warranty Reserve Activity (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies [Line Items]      
Beginning balance at January 1 $ 6 $ 6 $ 5
Accruals for warranties issued 17 13 14
Settlements (in cash or kind) (15) (13) (13)
Balance at end of period $ 8 $ 6 $ 6