Leases - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 27, 2020 USD ($)	Jun. 27, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Typical term of leases (not exceeding)		10 years
Fixed operating lease costs	$ 381	$ 1,100
Variable lease costs	1,800	6,600
Fixed operating lease payments	388	1,100
Right-of-use assets obtained in exchange for operating and finance lease liabilities	$ 403	$ 9,700
Weighted-average remaining lease term		10 years 6 months
Weighted-average discount rate	2.20%	2.20%
Leases not yet commenced, future payments	$ 1,800	$ 1,800
Minimum
Lessee, Lease, Description [Line Items]
Leases not yet commenced, lease term	1 year	1 year
Maximum
Lessee, Lease, Description [Line Items]
Leases not yet commenced, lease term	20 years	20 years