Significant Accounting Policies - Schedule of Effect of Adoption of New Accounting Pronouncement on Statement of Income (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Comprehensive income									$ 5,672	$ 1,526	$ 4,515
Total net sales	$ 14,411	$ 14,318	$ 13,398	$ 11,635	$ 13,844	$ 12,341	$ 12,563	$ 11,212	53,762	49,960	47,290
Total cost of sales									(46,488)	(43,589)	(41,889)
Severance charges									96	0	80
Gross profit									7,274	6,371	5,401
Other income, net									60	373	487
Operating profit	1,851	1,963	1,795	1,725	1,949	1,677	1,716	1,402	7,334	6,744	5,888
Interest expense									(668)	(651)	(663)
Other non-operating expense, net									(828)	(847)	(471)
Earnings from continuing operations before income taxes									5,838	5,246	4,754
Income tax expense									(792)	(3,356)	(1,093)
Net earnings 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
Basic
Continuing operations (in dollars per share)					$ (2.85)	$ 3.35	$ 3.31	$ 2.72	$ 17.74	$ 6.56	$ 12.23
Discontinued operations (in dollars per share)					0.25	0.00	0.00	0.00	0.00	0.26	5.05
Basic earnings 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
Continuing operations (in dollars per share)					(2.85)	3.32	3.28	2.69	17.59	6.50	12.08
Discontinued operations (in dollars per share)					0.25	0.00	0.00	0.00	0.00	0.25	4.99
Diluted earnings 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
Products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales									$ 45,005	$ 42,502	$ 40,081
Total cost of sales									(40,293)	(38,417)	(36,394)
Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales									8,757	7,458	7,209
Total cost of sales									(7,738)	(6,673)	(6,423)
Other unallocated, net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total cost of sales									$ 1,639	1,501	1,008
Historical
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales										51,048	47,248
Total cost of sales										(45,500)	(42,186)
Gross profit										5,548	5,062
Other income, net										373	487
Operating profit										5,921	5,549
Interest expense										(651)	(663)
Other non-operating expense, net										(1)	0
Earnings from continuing operations before income taxes										5,269	4,886
Income tax expense										(3,340)	(1,133)
Net earnings from continuing operations										1,929	3,753
Net earnings from discontinued operations										73	1,549
Net earnings										$ 2,002	$ 5,302
Basic
Continuing operations (in dollars per share)										$ 6.70	$ 12.54
Discontinued operations (in dollars per share)										0.26	5.17
Basic earnings per common share (in dollars per share)										6.96	17.71
Diluted
Continuing operations (in dollars per share)										6.64	12.38
Discontinued operations (in dollars per share)										0.25	5.11
Diluted earnings per common share (in dollars per share)										$ 6.89	$ 17.49
Historical | Products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales										$ 43,875	$ 40,365
Total cost of sales										(39,750)	(36,616)
Historical | Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales										7,173	6,883
Total cost of sales										(6,405)	(6,040)
Severance charges											80
Historical | Other unallocated, net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total cost of sales										655	550
ASC 606 | Adjustments for
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Comprehensive income										38
Total net sales										(1,088)	42
Total cost of sales										1,065	(174)
Gross profit										(23)	(132)
Other income, net										0	0
Operating profit										(23)	(132)
Interest expense										0	0
Other non-operating expense, net										0	0
Earnings from continuing operations before income taxes										(23)	(132)
Income tax expense										(16)	40
Net earnings from continuing operations										(39)	(92)
Net earnings from discontinued operations										0	(37)
Net earnings										$ (39)	$ (129)
Basic
Continuing operations (in dollars per share)										$ (0.14)	$ (0.31)
Discontinued operations (in dollars per share)										0.00	(0.12)
Basic earnings per common share (in dollars per share)										(0.14)	(0.43)
Diluted
Continuing operations (in dollars per share)										(0.14)	(0.30)
Discontinued operations (in dollars per share)										0.00	(0.12)
Diluted earnings per common share (in dollars per share)										$ (0.14)	$ (0.42)
ASC 606 | Adjustments for | Products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales										$ (1,373)	$ (284)
Total cost of sales										1,333	222
ASC 606 | Adjustments for | Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales										285	326
Total cost of sales										(268)	(383)
Severance charges											0
ASC 606 | Adjustments for | Other unallocated, net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total cost of sales										0	(13)
ASU 2017-07 | Adjustments for
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales										0	0
Total cost of sales										846	471
Gross profit										846	471
Other income, net										0	0
Operating profit										846	471
Interest expense										0	0
Other non-operating expense, net										(846)	(471)
Earnings from continuing operations before income taxes										0	0
Income tax expense										0	0
Net earnings from continuing operations										0	0
Net earnings from discontinued operations										0	0
Net earnings										$ 0	$ 0
Basic
Continuing operations (in dollars per share)										$ 0.00	$ 0.00
Discontinued operations (in dollars per share)										0.00	0.00
Basic earnings per common share (in dollars per share)										0.00	0.00
Diluted
Continuing operations (in dollars per share)										0.00	0.00
Discontinued operations (in dollars per share)										0.00	0.00
Diluted earnings per common share (in dollars per share)										$ 0.00	$ 0.00
ASU 2017-07 | Adjustments for | Products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales										$ 0	$ 0
Total cost of sales										0	0
ASU 2017-07 | Adjustments for | Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total net sales										0	0
Total cost of sales										0	0
Severance charges											0
ASU 2017-07 | Adjustments for | Other unallocated, net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total cost of sales										$ 846	$ 471