Other Expenses (Income), Net - Schedule of Other Income, Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Equity loss	$ 10	$ 10	$ 22	$ 12
Interest income	(4)	(4)	(8)	(10)
Foreign currency (gains) losses, net	(5)	11	(11)	(1)
Net (gain) loss from asset sales	(1)	(1)	(6)	1
Net loss (gain) on mark-to-market derivative contracts (M)	16	2	(1)	9
Other, net	3	4	(4)	(5)
Other income, net	$ 19	$ 22	$ (8)	$ 6