Other (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gain (Loss) on Sale and Revaluation of Assets	$ 6	$ 16
Other (income) expense - net	(9)	18
Other (Income) Expense - Net	(15)	2
Other (Income) Expense - Net [Member]
Defined benefit plan net periodic benefit cost other than service cost	$ 3	$ 9