Pension and Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 13	$ 13	$ 39	$ 39
Expected return on plan assets	(20)	(23)	(62)	(69)
Service cost
Amortization of net actuarial loss	5	6	17	16
Net periodic benefit cost (credit)	(2)	(4)	(6)	(14)
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	2	6	6
Expected return on plan assets	(1)	(1)	(3)	(2)
Service cost	1	2	4	4
Other				1
Amortization of net actuarial loss	2	1	5	4
Net periodic benefit cost (credit)	4	4	12	13
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1	3	3
Expected return on plan assets
Service cost
Amortization of net actuarial loss
Net periodic benefit cost (credit)	$ 1	$ 1	$ 3	$ 3