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Commitments and Contingencies - Warranty Reserve (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 24 $ 22
Accruals for warranties issued 31 29
Settlements (in cash or in kind) (29) (28)
Ending balance $ 26 $ 23