Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]
AOCI, Post-employment benefts, net of tax		$ (626)		$ (632)
AOCI, Hedge instruments, net of tax		(25)		(25)
AOCI, Translation adjustments and other, net of tax		(753)		(800)
Accumulated other comprehensive loss, net of tax		(1,404)		$ (1,457)
OCI, Post-employment benefts before reclassificaitons, net of tax		0
OCI, Hedge instruments before reclassificaitons, net of tax		0
OCI, Translation adjustments and other before reclassificaitons, net of tax		48
Other comprehensive income, before reclassifications to income		48
OCI, Post-employment benefts reclassificaitons to income, net of tax	[1]	6
OCI, Hedge instruments reclassificaitons to income, net of tax	[1]	0
OCI, Translation adjustments and other reclassificaitons to income, net of tax	[1]	(1)
Other comprehensive income, portion representing reclassificaitons to earnings	[1]	5
OCI, Post-employment benefts, net of tax		6	$ 22
OCI, Hedge instruments, net of tax		0	1
OCI, Translation adjustments and other, net of tax		47	(128)
Other comprehensive loss, net of tax		$ 53	$ (105)

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