Other (Income) Expense, Net (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Component of Other Income, Nonoperating [Line Items]
Interest income	$ (232)	$ (145)	$ (83)
Interest expense	714	695	715
Exchange losses	185	143	214
Other, net	449	253	458
Other (income) expense, net	$ 1,116	$ 946	$ 1,304