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Commitments - Standard Warranty Liability (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Movement in standard warranty liability    
Beginning Balance $ 118 $ 152
Current period accruals 66 84
Accrual adjustments to reflect actual experience (1) (31)
Charges incurred (86) (93)
Ending Balance $ 98 $ 112