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Commitments and Contingencies - Warranty Reserve Activity (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance at January 1 $ 4 $ 5
Provisions for warranties issued 1 1
Settlements (in cash or in kind) (2) (2)
Balance at March 31 $ 3 $ 4