Accumulated Other Comprehensive Loss - (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance	$ (1,005)	$ (749)
Other comprehensive income before reclassifications	51	(86)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	4	(7)
Deferred taxes	(1)	3
Ending Balance	(951)
Pensions and Other Postretirement Benefits
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance	(261)	(246)
Other comprehensive income before reclassifications	11	5
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	4	(7)
Deferred taxes	(1)	3
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance	(744)	(503)
Other comprehensive income before reclassifications	40	(91)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0	0
Deferred taxes	$ 0	$ 0