Pension and Post-Retirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	$ 14	$ 0	$ 14	$ 0
Pension Plan [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1	2	2	4
Defined Benefit Plan, Plan Assets, Administration Expense	1	0	2	0
Defined Benefit Plan, Interest Cost	6	6	18	19
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(10)	(10)	(32)	(30)
Defined Benefit Plan, Amortization of Gain (Loss)	0	0	0	1
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	(14)	0	(14)	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(16)	(2)	(24)	(6)
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0	1	1
Defined Benefit Plan, Plan Assets, Administration Expense	0	0	0	0
Defined Benefit Plan, Interest Cost	1	1	2	2
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	0	0	0	0
Defined Benefit Plan, Amortization of Gain (Loss)	0	0	0	0
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1	$ 1	$ 3	$ 3