Summary of Quarterly Information (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 31, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 15,137	$ 12,169	$ 12,685	$ 11,057	$ 13,752	$ 11,551	$ 11,577	$ 10,368	$ 51,048	$ 47,248	$ 40,536
Operating profit	1,859	1,428	1,485	1,149	1,428	1,588	1,375	1,158	5,921	5,549	4,712
Net earnings (loss) from continuing operations	(715)	939	942	763	959	1,089	899	806	1,929	3,753	3,126
Net earnings from discontinued operations	73	0	0	0	29	1,306	122	92	73	1,549	479
Net earnings	$ (642)	$ 939	$ 942	$ 763	$ 988	$ 2,395	$ 1,021	$ 898	$ 2,002	$ 5,302	$ 3,605
Earnings per common share from continuing operations
Basic (in dollars per share)	$ (2.50)	$ 3.27	$ 3.27	$ 2.63	$ 3.29	$ 3.64	$ 2.97	$ 2.65	$ 6.70	$ 12.54	$ 10.07
Diluted (in dollars per share)	(2.50)	3.24	3.23	2.61	3.25	3.61	2.93	2.61	6.64	12.38	9.93
Earnings per common share from discontinued operations:
Basic (in dollars per share)	0.25	0.00	0.00	0.00	0.10	4.38	0.40	0.30	0.26	5.17	1.55
Diluted (in dollars per share)	0.25	0.00	0.00	0.00	0.10	4.32	0.39	0.30	0.25	5.11	1.53
Basic earnings (loss) per common share (in dollars per share)	(2.25)	3.27	3.27	2.63	3.39	8.02	3.37	2.95	6.96	17.71	11.62
Diluted earnings (loss) per common share (in dollars per share)	$ (2.25)	$ 3.24	$ 3.23	$ 2.61	$ 3.35	$ 7.93	$ 3.32	$ 2.91	$ 6.89	$ 17.49	$ 11.46