Quarterly Results (Unaudited) - Unaudited Quarterly Results (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 25,587	[1]	$ 17,092	[1]	$ 15,704	[1]	$ 16,070	[1]	$ 21,268	[1]	$ 13,806	[1]	$ 12,834	[1]	$ 13,185	[1]	$ 74,452	$ 61,093	$ 48,077
Income (loss) from operations	510	[1]	(25)	[1]	79	[1]	181	[1]	405	[1]	(28)	[1]	107	[1]	192	[1]	745	676	862
Income (loss) before income taxes	451	[1]	(43)	[1]	17	[1]	81	[1]	337	[1]	(22)	[1]	146	[1]	84	[1]	506	544	934
Provision (benefit) for income taxes	179	[1]	(12)	[1]	13	[1]	(18)	[1]	194	[1]	83	[1]	109	[1]	43	[1]	161	428	291
Net income (loss)	$ 239	[1]	$ (41)	[1]	$ (7)	[1]	$ 82	[1]	$ 97	[1]	$ (274)	[1]	$ 7	[1]	$ 130	[1]	$ 274	$ (39)	$ 631
Basic earnings per share (in usd per share)	$ 0.52	[1]	$ (0.09)	[1]	$ (0.02)	[1]	$ 0.18	[1]	$ 0.21	[1]	$ (0.60)	[1]	$ 0.02	[1]	$ 0.29	[1]	$ 0.60	$ (0.09)	$ 1.39
Diluted earnings per share (in usd per share)	$ 0.51	[1]	$ (0.09)	[1]	$ (0.02)	[1]	$ 0.18	[1]	$ 0.21	[1]	$ (0.60)	[1]	$ 0.01	[1]	$ 0.28	[1]	$ 0.59	$ (0.09)	$ 1.37
Shares used in computation of earnings per share:
Basic (in shares)	458	[1]	457	[1]	456	[1]	455	[1]	454	[1]	452	[1]	451	[1]	453	[1]	457	453	453
Diluted (in shares)	467	[1]	457	[1]	456	[1]	463	[1]	461	[1]	452	[1]	458	[1]	460	[1]	465	453	461

[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.