Pension Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
U.S Pension Plans
Components of net periodic pension cost
Service cost	$ 4	$ 4
Interest cost	20	24
Expected asset return	(33)	(38)
Amortization:
Actuarial loss	14	15
Net periodic pension cost	5	5
Increase in pension liability		60
Non-U.S. Pension Plans
Components of net periodic pension cost
Service cost	4	4
Interest cost	11	13
Expected asset return	(18)	(21)
Amortization:
Actuarial loss	5	5
Net periodic pension cost	$ 2	$ 1