Other, Net, Included in Other Income (Expense), Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income from cash and cash investments	$ 1	$ 2	$ 5	$ 5
Other interest income	1	1	1	1
Income from financial investments (Note E)	2	19	20	69
Impairment of financial investments (Note E)			(2)
Other items, net	2		(1)
Total other net	$ 6	$ 22	$ 23	$ 75