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Commitments and Contingencies - Warranty Reserve Activity (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance at January 1 $ 4 $ 5
Provisions for warranties issued 2 3
Settlements (in cash or in kind) (3) (4)
Balance at June 30 $ 3 $ 4