Other Operating Expenses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 23	$ 21
Cost Management Initiatives
Restructuring Cost and Reserve [Line Items]
Restructuring charges	23
Additional cost expected to be incurred	$ 20