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