Leases (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 28, 2020	Mar. 28, 2020	Sep. 28, 2019	Sep. 29, 2018	Sep. 29, 2019
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 541	$ 541			$ 549
Operating Lease, Liability, Current	163	163
Operating Lease, Liability, Noncurrent	378	378
Operating Lease, Cost	51	100
Variable Lease, Cost	116	227
Short-term Lease, Cost	6	12
Lease, Cost	$ 173	339
Operating Lease, Payments		106
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 83
Operating Lease, Weighted Average Remaining Lease Term	5 years	5 years
Operating Lease, Weighted Average Discount Rate, Percent	3.00%	3.00%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 95	$ 95
Lessee, Operating Lease, Liability, Payments, Due Year Two	153	153
Lessee, Operating Lease, Liability, Payments, Due Year Three	108	108
Lessee, Operating Lease, Liability, Payments, Due Year Four	74	74
Lessee, Operating Lease, Liability, Payments, Due Year Five	57	57
Lessee, Operating Lease, Liability, Payments, Due after Year Five	91	91
Operating Lease, Liability	578	578
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	37	37
Operating Lease, Liability	$ 541	$ 541			$ 546
Operating Leases, Rent Expense			$ 220	$ 200
Operating Leases, Future Minimum Payments Due, Next Twelve Months			159
Operating Leases, Future Minimum Payments, Due in Two Years			113
Operating Leases, Future Minimum Payments, Due in Three Years			74
Operating Leases, Future Minimum Payments, Due in Four Years			49
Operating Leases, Future Minimum Payments, Due in Five Years			40
Operating Leases, Future Minimum Payments, Due Thereafter			54
Operating Leases, Future Minimum Payments Due			489
Grower Commitments [Member]
Leases [Abstract]
Other Commitment, Due in Next Twelve Months			253
Other Commitment, Due in Second Year			131
Other Commitment, Due in Third Year			86
Other Commitment, Due in Fourth Year			58
Other Commitment, Due in Fifth Year			49
Other Commitment, Due after Fifth Year			122
Other Commitment			$ 699