Changes in Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Abstract]
AOCI, Post-employment benefts, net of tax	$ (633)		$ (633)			$ (639)
AOCI, Hedge instruments, net of tax	(31)		(31)			(34)
AOCI, Translation adjustments and other, net of tax	(389)		(389)			(309)
Accumulated other comprehensive loss, net of tax	(1,053)		(1,053)			(982)
OCI, Post-employment benefts before reclassificaitons, net of tax			12
OCI, Hedge instruments before reclassificaitons, net of tax			(7)
OCI, Translation adjustments and other before reclassificaitons, net of tax			(78)
Other comprehensive income, before reclassifications to income			(73)
OCI, Post-employment benefts reclassificaitons to income, net of tax			(6)	[1]
OCI, Hedge instruments reclassificaitons to income, net of tax			10	[1]
OCI, Translation adjustments and other reclassificaitons to income, net of tax			(2)	[1]
Other comprehensive income, portion representing reclassificaitons to earnings			2	[1]
OCI, Post-employment benefts, net of tax	7	0	(6)		(9)
OCI, Hedge instruments, net of tax	(3)	0	3		14
OCI, Translation adjustments and other, net of tax	(39)	(110)	(80)		(26)
Other comprehensive loss, net of tax	$ (49)	$ (110)	$ (71)		$ (3)

[1] Refer to Note 11, "Pension, Other Post-employment Benefits and Employee Benefit Plans," and Note 6, "Financial Instruments," for additional information with respect to reclassifications from accumulated other comprehensive loss to earnings relating to post-employment benefits, net of tax and hedge instruments, net of tax, respectively. Such items do not represent reclassifications in their entirety.