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Goodwill And Intangible Assets (Goodwill Activity) (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Goodwill [Roll Forward]
Goodwill, beginning of period		$ 9,941	$ 7,286
Accumulated impairment losses		(617)	(617)	$ (617)
Goodwill, net		9,739	9,324	6,669
Acquisition		447	2,982
Goodwill, Written off Related to Sale of Business Unit		(30)	(327)
Measurement period adjustments		(2)
Allocation of acquired goodwill		0
Goodwill, end of period		10,356	9,941
Beef [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period		1,236	1,236
Accumulated impairment losses		(560)	(560)	(560)
Goodwill, net		676	676	676
Acquisition		0	0
Goodwill, Written off Related to Sale of Business Unit		0	0
Measurement period adjustments		0
Allocation of acquired goodwill		0
Goodwill, end of period		1,236	1,236
Pork [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period		423	423
Accumulated impairment losses		0	0	0
Goodwill, net		423	423	423
Acquisition		0	0
Goodwill, Written off Related to Sale of Business Unit		0	0
Measurement period adjustments		0
Allocation of acquired goodwill		0
Goodwill, end of period		423	423
Chicken [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period		1,565	1,565
Accumulated impairment losses		0	0	0
Goodwill, net		2,498	1,565	1,565
Acquisition		365	0
Goodwill, Written off Related to Sale of Business Unit		0	0
Measurement period adjustments		0
Allocation of acquired goodwill		568
Goodwill, end of period		2,498	1,565
Prepared Foods [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period		3,678	4,005
Accumulated impairment losses		0	0	0
Goodwill, net		6,142	3,678	4,005
Acquisition		82	0
Goodwill, Written off Related to Sale of Business Unit		(30)	(327)
Measurement period adjustments		0
Allocation of acquired goodwill		2,412
Goodwill, end of period		6,142	3,678
Other [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	[1]	57	57
Accumulated impairment losses	[1]	(57)	(57)	(57)
Goodwill, net	[1]	0	0	0
Acquisition	[1]	0	0
Goodwill, Written off Related to Sale of Business Unit	[1]	0	0
Measurement period adjustments	[1]	0
Allocation of acquired goodwill	[1]	0
Goodwill, end of period	[1]	57	57
Unallocated Goodwill [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period		2,982	0
Accumulated impairment losses		0	0	0
Goodwill, net		0	2,982	$ 0
Acquisition		0	2,982
Goodwill, Written off Related to Sale of Business Unit		0	0
Measurement period adjustments		(2)
Allocation of acquired goodwill		(2,980)
Goodwill, end of period		$ 0	$ 2,982
[1] Other included the goodwill from our foreign chicken operation.

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