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Warranty Reserve Activity (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Guarantor Obligations [Line Items]    
Beginning balance at January 1 $ 8 $ 8
Provisions for warranties issued 3 3
Settlements (in cash or in kind) (4) (4)
Balance at March 31 $ 7 $ 7