Unaudited Quarterly Results (Detail) (USD $) In Millions, except Per Share data, 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
Effect of Fourth Quarter Events [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
Income (loss) before income taxes	273	[1]	130	[1]	225	[1]	307	[1]	337	[1]	(22)	[1]	146	[1]	84	[1]	544	934	1,497
Provision for income taxes	86	[1]	67	[1]	49	[1]	89	[1]	194	[1]	83	[1]	109	[1]	43	[1]	428	291	352
Net income	$ 177	[1]	$ 63	[1]	$ 191	[1]	$ 201	[1]	$ 97	[1]	$ (274)	[1]	$ 7	[1]	$ 130	[1]	$ (39)	$ 631	$ 1,152
Basic earnings per share	$ 0.39	[1]	$ 0.14	[1]	$ 0.42	[1]	$ 0.44	[1]	$ 0.21	[1]	$ (0.60)	[1]	$ 0.02	[1]	$ 0.29	[1]	$ (0.09)	$ 1.39	$ 2.58
Diluted earnings per share	$ 0.38	[1]	$ 0.14	[1]	$ 0.41	[1]	$ 0.44	[1]	$ 0.21	[1]	$ (0.60)	[1]	$ 0.01	[1]	$ 0.28	[1]	$ (0.09)	$ 1.37	$ 2.53
Shares used in computation of earnings per share:
Basic	455	[1]	454	[1]	453	[1]	451	[1]	454	[1]	452	[1]	451	[1]	453	[1]	453	453	447
Diluted	462	[1]	461	[1]	460	[1]	459	[1]	461	[1]	452	[1]	458	[1]	460	[1]	453	461	456

[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.