Acquisitions and Dispositions Acquisition (Narrative) (Details) - USD ($) $ in Millions					3 Months Ended		9 Months Ended
	Feb. 07, 2020	Jan. 15, 2020	Jun. 03, 2019	Nov. 30, 2018	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Sep. 28, 2019
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired							$ 0	$ 2,461
Goodwill					$ 10,890		10,890		$ 10,844
Sales					10,022	$ 10,885	31,725	31,521
Payments to Acquire Equity Method Investments							183	0
BRF S.A. Thailand and Europe [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Working Capital			262
Cash and cash equivalents			56
Property, Plant and Equipment			89
Intangible Assets			23
Goodwill			47
Goodwill, Purchase Accounting Adjustments							46
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Working Capital							(45)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment							4
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Taxes							3
Other Liabilities			24
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent			8
Business Combination, Consideration Transferred			$ 326
Keystone Foods [Member]
Business Acquisition [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value				$ 122
Cash and cash equivalents				186
Property, Plant and Equipment				676
Intangible Assets				659
Goodwill				1,120
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent				177
Business Combination, Consideration Transferred				$ 2,300
Customer Relationships [Member] | BRF S.A. Thailand and Europe [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			7 years
Customer Relationships [Member] | Keystone Foods [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				25 years
Prepared Foods [Member]
Business Acquisition [Line Items]
Sales					2,035	2,089	6,255	6,265
Chicken [Member]
Business Acquisition [Line Items]
Sales					3,112	3,331	9,801	9,853
Chicken [Member] | Keystone Foods [Member]
Business Acquisition [Line Items]
Goodwill				$ 779
Corporate and Other [Member]
Business Acquisition [Line Items]
Sales					$ 402	$ 356	$ 1,365	$ 776
Corporate and Other [Member] | Keystone Foods [Member]
Business Acquisition [Line Items]
Goodwill				$ 341
Vibra [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired		40.00%
Payments to Acquire Equity Method Investments		$ 122
JBS [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	50.00%
Payments to Acquire Equity Method Investments	$ 61