Pension and Other Postretirement Benefits - Effect of Foreign Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan cost	$ 0	$ 2	$ 0	$ 7
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan cost	$ 2	$ 3	$ 4	$ 5