Restructuring Charges and Related Payments and Adjustments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 31	$ 33
Activity during the period:
Charges to restructuring	21	27
Adjustments of accruals	(1)	(1)
Non-cash write-off	(1)	(1)
Cash payments	(8)	(16)
Ending Balance	42	42
Employee Termination Benefits
Restructuring Cost and Reserve [Line Items]
Beginning balance	28	30
Activity during the period:
Charges to restructuring	8	12
Adjustments of accruals	(1)	(1)
Cash payments	(6)	(12)
Ending Balance	29	29
Accelerated Depreciation/Impairment
Activity during the period:
Charges to restructuring	1	1
Non-cash write-off	(1)	(1)
Exit Costs
Restructuring Cost and Reserve [Line Items]
Beginning balance	3	3
Activity during the period:
Charges to restructuring	12	14
Cash payments	(2)	(4)
Ending Balance	$ 13	$ 13