Other (Charges) Gains, Net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Restructuring and Related Activities [Abstract]
Employee termination benefits	$ (3)	$ (10)	$ (8)	[1]	$ (14)

[1] Includes $3 million of special termination benefits included in Benefit obligations in the unaudited consolidated balance sheets.