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Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Settlements		$ 3	$ 0	$ 3	$ 0
Employer matching contribution		13	11	38	36
Multiemployer plan contributions		$ 10	$ 9	$ 28	$ 27
Subsequent event
Defined Benefit Plan Disclosure [Line Items]
Settlement payments						$ 75
Settlements	$ 16					$ 19