Costs Associated with Rationalization Programs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	$ 21	$ 26	$ 41	$ 67
Asset Write-off and Accelerated Depreciation Charges	5	13	15	19
Plans Initiated 2013
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	13		18
Plans Initiated 2013 | Associate Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	11		16
Plans Initiated 2013 | Other Exit And Noncancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	2		2
Plans Initiated 2012
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	8	21	23	39
Plans Initiated 2012 | Associate Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	3	21	9	29
Plans Initiated 2012 | Other Exit And Noncancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)	5	0	14	10
Plans Initiated In 2011 Member
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)		5		28
Plans Initiated In 2011 Member | Associate Related Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)		1		11
Plans Initiated In 2011 Member | Other Exit And Noncancelable Lease Costs
Restructuring Cost and Reserve [Line Items]
Rationalizations (Note 2)		$ 4		$ 17