Postretirement Benefit Plans - Additional Information (Details) - Pension - USD ($)	3 Months Ended	12 Months Ended
	Sep. 27, 2019	Jun. 29, 2018	Jun. 30, 2017	Oct. 02, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary employer contributions	$ 327,000,000
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Voluntary employer contributions	$ 302,000,000	$ 700,000,000	$ 700,000,000
Required employer contributions during the reminder of 2020				$ 0