Description of Business and Summary of Significant Accounting Policies - Accrued Warranties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in Accrued Product Warranties
Beginning balance	$ 45	$ 45	$ 46
Charges	(49)	(45)	(41)
Provision charged to expense	50	43	42
Acquisitions and divestitures	0	0	1
Foreign currency translation	(1)	2	(3)
Ending balance	$ 45	$ 45	$ 45