Reportable Segments (Reconciliation of Reportable Segment and All Other Net Sales to Consolidated Net Sales) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Reportable Segments [Abstract]
Net sales of reportable segments and All Other		$ 2,513	$ 2,421
Impact of foreign currency movements not included in segment net sales	[1]	(13)	(46)
Net sales		$ 2,500	$ 2,375

[1] This amount primarily represents the impact of foreign currency adjustments in the Display Technologies segment.