Restructuring Level 4 (Details) - Restructuring by Type (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Expected savings of in-process cost reduction programs		$ 16
Restructuring costs expected to be incurred		33
Cumulative restructuring costs, Incurred to Date		26
Restructuring Reserve [Roll Forward]
Accrued liability, Beginning Balance		6
Restructuring charges	7	20
Payments		(12)
Accrued liability, Ending Balance	14	14
Workforce reductions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected to be incurred		25
Cumulative restructuring costs, Incurred to Date		19
Restructuring Reserve [Roll Forward]
Accrued liability, Beginning Balance		6
Restructuring charges		13
Payments		(5)
Accrued liability, Ending Balance	14	14
Site closure costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected to be incurred		7
Cumulative restructuring costs, Incurred to Date		7
Restructuring Reserve [Roll Forward]
Accrued liability, Beginning Balance		0
Restructuring charges		7
Payments		(7)
Accrued liability, Ending Balance	0	0
Other projects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected to be incurred		1
Cumulative restructuring costs, Incurred to Date		0
Restructuring Reserve [Roll Forward]
Accrued liability, Beginning Balance		0
Restructuring charges		0
Payments		0
Accrued liability, Ending Balance	$ 0	$ 0
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities will occur over the next (in months)		12
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring activities will occur over the next (in months)		15