Pension and Other Postretirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 1
Interest cost	7	16	17	32
Expected return on plan assets	(6)	(15)	(15)	(29)
Amortization of Net actuarial loss	1	1	2	1
Amortization of prior service credit	0	0	0	0
Settlement (gain) loss	(106)	0	(106)	19
Net periodic cost (credit)	(104)	2	(102)	24
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	0	1	0	1
Amortization of prior service credit	(1)	(1)	(1)	(5)
Net periodic cost (credit)	$ (1)	$ 0	$ (1)	$ (4)