Retirement Plans, Change in Projected Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2017	Oct. 01, 2016	Sep. 26, 2015
Defined Contribution 401 (k) Retirement Plan [Abstract]
Defined contribution plan expense		$ 18	$ 10	$ 7
Change in Projected Benefit Obligations (PBO) [Roll Forward]
Service cost		0	3	1
Interest cost		11	16	8
Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of period		418
Plan assets at end of period		291	418
Loss related to reclassification of change to defined contribution plan		(10)
Net unrealized losses in accumulated other comprehensive loss		35
Amount expected to be amortized from accumulated other comprehensive loss in fiscal 2018		$ 2
Period of time to recognize remaining net unrealized losses		11 years
Defined Benefit Pension Plans [Member]
Change in Projected Benefit Obligations (PBO) [Roll Forward]
PBO at beginning of period		$ 492	193
Acquisitions		0	256
Service cost		0	3
Interest cost		11	15
Actuarial loss (gain)		(15)	44
Currency impact		0	1
Plan conversion	[1]	(139)	0
Benefit settlements		(3)	0
Benefits paid		(16)	(20)
PBO at end of period		330	492	193
Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of period		418	142
Acquisitions		0	253
Currency impact		0	1
Actual return on plan assets		22	37
Company contributions		7	5
Plan conversion	[1]	(136)	0
Benefit settlements		(2)	0
Benefits paid		(18)	(20)
Plan assets at end of period		291	418	142
Net amount recognized		(39)	(74)
Retiree Health Plan [Member]
Change in Projected Benefit Obligations (PBO) [Roll Forward]
PBO at beginning of period		7	2
Acquisitions		0	5
Service cost		0	0
Interest cost		0	0
Actuarial loss (gain)		0	0
Currency impact		0	0
Plan conversion	[1]	0	0
Benefit settlements		0	0
Benefits paid		0	0
PBO at end of period		7	7	2
Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of period		0	0
Acquisitions		0	0
Currency impact		0	0
Actual return on plan assets		0	0
Company contributions		1	0
Plan conversion	[1]	0	0
Benefit settlements		0	0
Benefits paid		(1)	0
Plan assets at end of period		0	0	$ 0
Net amount recognized		$ (7)	$ (7)

[1] During fiscal 2017, the Company contributed assets from a foreign defined benefit pension plan in order to convert the plan into a defined contribution plan. As a result of the transaction, the Company recognized a loss of $10 million related to the reclassification of amount previously deferred in Accumulated other comprehensive loss to the Consolidated Statements of Income.