Summary of Unaudited Income Statement Information (Details) - Zenuity - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 2	$ 1	$ 3	$ 1
Operating loss	(32)	(16)	(60)	(16)
Loss before income taxes	(32)	(16)	(60)	(16)
Net loss	$ (32)	$ (16)	$ (60)	$ (16)