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Warranty Reserve Activity (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Commitments and Contingencies [Line Items]    
Beginning balance at January 1 $ 8 $ 6
Provisions for warranties issued 10 12
Settlements (in cash or in kind) (11) (11)
Balance at September 30 $ 7 $ 7