Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Net sales:
Net sales	$ 1,691	$ 1,422	$ 3,270	$ 2,821
Cost of sales and operating expenses:
Total cost of sales and operating expenses	1,575	1,293	2,982	2,554
Gross income	116	129	288	267
Selling, general and administrative expenses	84	74	159	144
Operating income	32	55	129	123
Other income (expense):
Interest expense	(11)	(7)	(19)	(10)
Interest income	2	5	4	7
Interest income from affiliates	1	6	2	12
Loss from affiliates	(16)	(8)	(22)	(7)
Other investment income (loss), net	12	28	(25)	65
Foreign currency gains (losses), net	(6)	6	(2)	9
Miscellaneous, net	(3)	(1)	(2)	(3)
Total other income (expense), net	(21)	29	(64)	73
Earnings before income taxes	11	84	65	196
Income tax expense	(4)	(25)	(26)	(53)
Net earnings	7	59	39	143
Less: Net loss attributable to noncontrolling interests		(1)
Net earnings attributable to Seaboard	$ 7	$ 58	$ 39	$ 143
Earnings per common share	$ 6.28	$ 50.51	$ 33.03	$ 122.35
Other comprehensive income (loss), net of income tax benefit (expense) of $1, $0, $1 and $(1):
Foreign currency translation adjustment	$ (17)	$ 1	$ (27)	$ (1)
Unrealized gain on investments		2		3
Unrecognized pension cost	(3)	1	(2)	2
Other comprehensive income (loss), net of tax	(20)	4	(29)	4
Comprehensive income (loss)	(13)	63	10	147
Less: Comprehensive income attributable to noncontrolling interests		(1)
Comprehensive income (loss) attributable to Seaboard	$ (13)	$ 62	$ 10	$ 147
Average number of shares outstanding (in shares)	1,170,550	1,170,550	1,170,550	1,170,550
Dividends declared per common share (in dollars per share)	$ 1.50	$ 1.50	$ 3.00	$ 3.00
Products
Net sales:
Net sales	$ 1,382	$ 1,153	$ 2,673	$ 2,278
Cost of sales and operating expenses:
Total cost of sales and operating expenses	1,309	1,056	2,454	2,078
Services
Net sales:
Net sales	278	245	542	494
Cost of sales and operating expenses:
Total cost of sales and operating expenses	242	216	482	435
Other
Net sales:
Net sales	31	24	55	49
Cost of sales and operating expenses:
Total cost of sales and operating expenses	$ 24	$ 21	$ 46	$ 41