Retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 25, 2020	Dec. 27, 2019
Non-U.S. Plans
Net Periodic Postretirement Benefit Cost (Credit)
Service cost	$ 12	$ 13
Interest cost	7	6
Expected return on plan assets	(14)	(15)
Amortization of net actuarial loss	8	10
Amortization of prior service credit	(1)	(2)
Net periodic pension benefit cost (credit)	12	12
Defined benefit plan, contributions by employer	10
U.S. Plans
Net Periodic Postretirement Benefit Cost (Credit)
Service cost	3	3
Interest cost	8	9
Expected return on plan assets	(13)	(15)
Amortization of net actuarial loss	2	2
Net periodic pension benefit cost (credit)		$ (1)
Defined benefit plan, contributions by employer	$ 17