Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]
AOCI, Post-employment benefts, net of tax		$ (622)		$ (622)		$ (632)
AOCI, Hedge instruments, net of tax		(24)		(24)		(25)
AOCI, Translation adjustments and other, net of tax		(813)		(813)		(800)
Accumulated other comprehensive loss, net of tax		(1,459)		(1,459)		$ (1,457)
OCI, Post-employment benefts before reclassificaitons, net of tax				1
OCI, Hedge instruments before reclassificaitons, net of tax				(1)
OCI, Translation adjustments and other before reclassificaitons, net of tax				(12)
Other comprehensive income, before reclassifications to income				(12)
OCI, Post-employment benefts reclassificaitons to income, net of tax	[1]			9
OCI, Hedge instruments reclassificaitons to income, net of tax	[1]			2
OCI, Translation adjustments and other reclassificaitons to income, net of tax	[1]			(1)
Other comprehensive income, portion representing reclassificaitons to earnings	[1]			10
OCI, Post-employment benefts, net of tax		4	$ 2	10	$ 24
OCI, Hedge instruments, net of tax		1	(2)	1	(1)
OCI, Translation adjustments and other, net of tax		(60)	25	(13)	(103)
Other comprehensive (loss) income, net of tax		$ (55)	$ 25	$ (2)	$ (80)

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