Costs Associated with Rationalization Programs (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
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	$ 13	$ 26	$ 20	$ 41
Restructuring Reserve, Accelerated Depreciation	5	4	10	6
Plans Initiated 2013
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	5		5
Plans Initiated 2013 | Associate Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	5		5
Plans Initiated 2013 | Other Exit Costs And Noncancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	0		0
Plans Initiated 2012
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	8	11	15	18
Plans Initiated 2012 | Associate Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	6	4	6	11
Plans Initiated 2012 | Other Exit Costs And Noncancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	2	7	9	7
Plans Initiated In 2011 Member
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)		15		23
Plans Initiated In 2011 Member | Associate Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)		9		10
Plans Initiated In 2011 Member | Other Exit Costs And Noncancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)		$ 6		$ 13