Retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Non-U.S. Plans
Defined Benefit Plan, Net Periodic Pension Benefit Cost
Service cost	$ 13	$ 12
Interest cost	6	11
Expected return on plan assets	(15)	(16)
Amortization of net actuarial loss	10	6
Amortization of prior service credit	(2)	(2)
Net periodic pension benefit cost (credit)	12	11
U.S. Plans
Defined Benefit Plan, Net Periodic Pension Benefit Cost
Service cost	3	3
Interest cost	9	12
Expected return on plan assets	(15)	(14)
Amortization of net actuarial loss	2	4
Net periodic pension benefit cost (credit)	$ (1)	$ 5