Summary of Quarterly Information (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 24, 2018	Mar. 25, 2018	Dec. 31, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 14,411	$ 14,318	$ 13,398	$ 11,635	$ 13,844	$ 12,341	$ 12,563	$ 11,212	$ 53,762	$ 49,960	$ 47,290
Operating profit	1,851	1,963	1,795	1,725	1,949	1,677	1,716	1,402	7,334	6,744	5,888
Net earnings (loss) from continuing operations					(817)	963	955	789	5,046	1,890	3,661
Net earnings from discontinued operations					73	0	0	0	0	73	1,512
Net earnings	$ 1,253	$ 1,473	$ 1,163	$ 1,157	$ (744)	$ 963	$ 955	$ 789	$ 5,046	$ 1,963	$ 5,173
Earnings (loss) per common share from continuing operations:
Basic (in dollars per share)					$ (2.85)	$ 3.35	$ 3.31	$ 2.72	$ 17.74	$ 6.56	$ 12.23
Diluted (in dollars per share)					(2.85)	3.32	3.28	2.69	17.59	6.50	12.08
Earnings per common share from discontinued operations:
Basic (in dollars per share)					0.25	0.00	0.00	0.00	0.00	0.26	5.05
Diluted (in dollars per share)					0.25	0.00	0.00	0.00	0.00	0.25	4.99
Basic earnings (loss) per common share (in dollars per share)	$ 4.43	$ 5.18	$ 4.08	$ 4.05	(2.60)	3.35	3.31	2.72	17.74	6.82	17.28
Diluted earnings (loss) per common share (in dollars per share)	$ 4.39	$ 5.14	$ 4.05	$ 4.02	$ (2.60)	$ 3.32	$ 3.28	$ 2.69	$ 17.59	$ 6.75	$ 17.07