Quarterly Results (Unaudited) - Unaudited Quarterly Results (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	[1]	Sep. 30, 2014	[1]	Jun. 30, 2014	[1]	Mar. 31, 2014	[1]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 35,747		$ 25,358		$ 23,185		$ 22,717		$ 29,328		$ 20,579		$ 19,340		$ 19,741		$ 107,006	$ 88,988	$ 74,452
Income (loss) from operations	1,108		406		464		255		591		(544)		(15)		146		2,233	178	745
Income (loss) before income taxes	938		247		362		21		429		(634)		(27)		120		1,568	(111)	506
Provision for income taxes	(453)		(161)		(266)		(71)		(205)		205		(94)		(73)		(950)	(167)	(161)
Net income (loss)	$ 482		$ 79		$ 92		$ (57)		$ 214		$ (437)		$ (126)		$ 108		$ 596	$ (241)	$ 274
Basic earnings per share	$ 1.03		$ 0.17		$ 0.20		$ (0.12)		$ 0.46		$ (0.95)		$ (0.27)		$ 0.23		$ 1.28	$ (0.52)	$ 0.60
Diluted earnings per share	$ 1.00		$ 0.17		$ 0.19		$ (0.12)		$ 0.45		$ (0.95)		$ (0.27)		$ 0.23		$ 1.25	$ (0.52)	$ 0.59
Shares used in computation of earnings per share:
Basic	470		468		467		465		464		463		461		460		467	462	457
Diluted	481		478		476		465		472		463		461		468		477	462	465

[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.