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Commitments - Standard Warranty Liability (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Movement in standard warranty liability    
Beginning Balance $ 113 $ 118
Current period accruals 56 66
Accrual adjustments to reflect actual experience (15) (1)
Charges incurred (73) (86)
Ending Balance $ 80 $ 98