Summary of Other Income (Expense), Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Component of Other Income, Nonoperating [Line Items]
Interest income	$ 6	$ 7
Foreign exchange gain (loss)	(9)	(3)
Loss on extinguishment of debt		(53)
Strategic transaction expenses	(3)	(2)
Impairment of long-lived assets	(2)
Other	5	3
Other expense, net	$ (3)	$ (48)