Restructuring Charges and Related Payments and Adjustments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 42	$ 33
Activity during the period:
Charges to restructuring	6	31
Adjustments of accruals		(1)
Discontinued operations charges	1	3
Non-cash write-off	(1)	(2)
Cash payments	(8)	(24)
Ending Balance	40	40
Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Beginning balance	29	30
Activity during the period:
Charges to restructuring	4	16
Adjustments of accruals		(1)
Cash payments	(6)	(18)
Ending Balance	27	27
Accelerated Depreciation/Impairment
Activity during the period:
Discontinued operations charges	1	2
Non-cash write-off	(1)	(2)
Exit Costs
Restructuring Cost and Reserve [Line Items]
Beginning balance	13	3
Activity during the period:
Charges to restructuring	2	15
Discontinued operations charges		1
Cash payments	(2)	(6)
Ending Balance	$ 13	$ 13