Net Sales Attributed to Foreign Countries (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 17,431	[1]	$ 10,876	[1]	$ 9,913	[1]	$ 9,857	[1]	$ 21,268	[1]	$ 13,806	[1]	$ 12,834	[1]	$ 13,185	[1]	$ 61,093	$ 48,077	$ 34,204
Foreign Country | Germany
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales																	8,732	7,230	5,296
Foreign Country | Japan
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales																	7,800	6,576	5,025
Foreign Country | United Kingdom
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales																	$ 6,478	$ 5,348	$ 3,929

[1] The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted-average shares outstanding for each period.