Restructuring of Operations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2012 Person	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 6	$ 22		$ 30	$ 60
Lease termination costs			20
Estimated reduction of employees over the next two years				900
Restructuring accruals	40			40		42	33
Fiscal Year 2012
Restructuring Cost and Reserve [Line Items]
Restructuring accruals	14			14
There After
Restructuring Cost and Reserve [Line Items]
Restructuring accruals	26			26
Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4			15	23
Restructuring accruals	27			27		29	30
Exit Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2			16	40
Restructuring accruals	13			13		13	3
Accelerated Depreciation/Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1			2	2
Discontinued Operations
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1	2		3	5
Total Restructuring Costs including cost associated with discontinued operations.
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 7	$ 24		$ 33	$ 65