Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Accrued Expenses And Other Current Liabilities [Abstract]
Wage and other employee-related accrued expenses	$ 20		$ 41
Accrued tax expense	67		91
Accrued insurance	35		31
Accrued interest expense	23		47
Dealer deposits	18		18
Other	56		65
Total	225	$ 298	299
Accrued Environmental Loss Contingencies, Current	$ 6		$ 6