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Segment Reporting (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 03, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018	Nov. 30, 2018
Segment Reporting Information [Line Items]
Number of segments									4
Goodwill	$ 10,899				$ 10,844				$ 10,899	$ 10,844	$ 9,739
Sales	11,460	$ 10,022	$ 10,888	$ 10,815	10,884	$ 10,885	$ 10,443	$ 10,193	43,185	42,405	40,052
UNITED STATES
Segment Reporting Information [Line Items]
Long-lived assets	25,600				24,800				25,600	24,800
UNITED STATES | Long-Lived Assets Excluding Goodwill and Intangibles [Member]
Segment Reporting Information [Line Items]
Long-lived assets	8,500				7,500				8,500	7,500
Non-US [Member]
Segment Reporting Information [Line Items]
Long-lived assets	1,287				1,107				1,287	1,107
Non-US [Member] | Long-Lived Assets Excluding Goodwill and Intangibles [Member]
Segment Reporting Information [Line Items]
Long-lived assets	648				506				648	506
Export sales [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Sales									$ 4,000	$ 4,100	$ 4,200
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | UNITED STATES
Segment Reporting Information [Line Items]
Concentration, Percentage									95.00%	96.00%	99.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Non-US [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Concentration, Percentage									10.00%	10.00%	10.00%
Wal-Mart Stores, Inc. [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration, Percentage									18.70%	16.90%	17.30%
Other [Member]
Segment Reporting Information [Line Items]
Goodwill	392				337				$ 392	$ 337	$ 0
Sales									1,856	1,289
Beef [Member]
Segment Reporting Information [Line Items]
Goodwill	676				676				676	676	676
Sales									15,742	15,828
Pork [Member]
Segment Reporting Information [Line Items]
Goodwill	423				423				423	423	423
Sales									5,128	4,932
Chicken [Member]
Segment Reporting Information [Line Items]
Goodwill	3,274				3,274				3,274	3,274	2,498
Sales									13,234	13,300
Prepared Foods [Member]
Segment Reporting Information [Line Items]
Goodwill	6,134				$ 6,134				6,134	6,134	6,142
Sales									8,532	8,418
Segment Reconciling Items [Member] | Other [Member]
Segment Reporting Information [Line Items]
Business Combination, Acquisition Related Costs									5	36	26
Sales									1,856	1,289	305
Operating Segments [Member] | Beef [Member]
Segment Reporting Information [Line Items]
Sales									15,742	15,828	15,473
Operating Segments [Member] | Pork [Member]
Segment Reporting Information [Line Items]
Sales									5,128	4,932	4,879
Operating Segments [Member] | Chicken [Member]
Segment Reporting Information [Line Items]
Sales									13,234	13,300	12,044
Operating Segments [Member] | Prepared Foods [Member]
Segment Reporting Information [Line Items]
Sales									8,532	8,418	8,668
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales									(1,307)	(1,362)	(1,317)
Intersegment Eliminations [Member] | Beef [Member]
Segment Reporting Information [Line Items]
Sales									(390)	(411)	(420)
Intersegment Eliminations [Member] | Pork [Member]
Segment Reporting Information [Line Items]
Sales									(865)	(893)	(817)
Intersegment Eliminations [Member] | Chicken [Member]
Segment Reporting Information [Line Items]
Sales									(52)	$ (58)	$ (80)
Keystone Foods and Thai & European Operations [Domain]
Segment Reporting Information [Line Items]
Goodwill	$ 342								$ 342
Keystone Foods [Member]
Segment Reporting Information [Line Items]
Business Combination, Acquisition Related Costs							$ 11	$ 15
Goodwill												$ 1,120
Keystone Foods [Member] | Other [Member]
Segment Reporting Information [Line Items]
Goodwill												341
Keystone Foods [Member] | Chicken [Member]
Segment Reporting Information [Line Items]
Goodwill												$ 779

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