Other (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Other Income and Expenses [Abstract]
Financing Receivable, Allowance for Credit Losses	$ 3		$ 3
Gain (Loss) on Sale and Revaluation of Assets	15	$ 6
Other - net	7	(9)
Other (Income) Expense - Net	(8)	(15)
Defined benefit plan net periodic benefit cost other than service cost	$ 2	$ 3