Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 9	$ 11
Expected return on plan assets	(12)	(18)
Service cost
Amortization of net actuarial loss	5	7
Net periodic benefit cost	2	0
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	1
Expected return on plan assets	(1)	(1)
Service cost	2	2
Amortization of net actuarial loss	2	2
Net periodic benefit cost	5	4
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1
Expected return on plan assets
Service cost
Amortization of net actuarial loss
Net periodic benefit cost	$ 1	$ 1