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Warranty Reserve Activity (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Guarantor Obligations [Line Items]    
Beginning balance at January 1 $ 8 $ 8
Provisions for warranties issued 11 10
Settlements (in cash or in kind) (13) (11)
Balance at September 30 $ 6 $ 7