Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]
AOCI, Post-employment benefts, net of tax	$ (615)		$ (615)		$ (632)
AOCI, Hedge instruments, net of tax	(23)		(23)		(25)
AOCI, Translation adjustments and other, net of tax	(810)		(810)		(800)
Accumulated other comprehensive loss, net of tax	(1,448)		(1,448)		$ (1,457)
OCI, Post-employment benefts before reclassificaitons, net of tax			1
OCI, Hedge instruments before reclassificaitons, net of tax			0
OCI, Translation adjustments and other before reclassificaitons, net of tax			(9)
Other comprehensive income, before reclassifications to income			(8)
OCI, Post-employment benefts reclassificaitons to income, net of tax			16
OCI, Hedge instruments reclassificaitons to income, net of tax			2
OCI, Translation adjustments and other reclassificaitons to income, net of tax			(1)
Other comprehensive income, portion representing reclassificaitons to earnings			17
OCI, Post-employment benefts, net of tax	7	$ 10	17	$ 34
OCI, Hedge instruments, net of tax	1	0	2	(1)
OCI, Translation adjustments and other, net of tax	3	(97)	(10)	(200)
Other comprehensive income (loss), net of tax	$ 11	$ (87)	$ 9	$ (167)