Retirement Plans, Change in Projected Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Defined Contribution 401 (k) Retirement Plan [Abstract]
Defined contribution plan expense	$ 26	$ 20	$ 18
Change in Projected Benefit Obligations (PBO) [Roll Forward]
PBO at beginning of period	307	330
Acquisition	1,019	0
Service cost	2	0	0
Interest cost	12	11	11
Assumption change	5	0
Currency	(34)	0
Actuarial loss (gain)	94	(17)
Benefits paid	(28)	(17)
PBO at end of period	1,377	307	330
Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of period	277	291
Acquisition	772	0
Currency	(25)	0
Return on assets	62	0
Contributions	7	3
Benefits paid	(28)	(17)
Plan assets at end of period	1,065	277	291
Underfunded status	(312)	(30)
Net unrealized losses in accumulated other comprehensive loss	(89)
Amount expected to be amortized from accumulated other comprehensive loss in fiscal 2018	5
North America [Member]
Change in Projected Benefit Obligations (PBO) [Roll Forward]
PBO at beginning of period	307	330
Acquisition	0	0
Service cost	0	0
Interest cost	12	11
Assumption change	0	0
Currency	0	0
Actuarial loss (gain)	42	(17)
Benefits paid	(17)	(17)
PBO at end of period	344	307	330
Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of period	277	291
Acquisition	0	0
Currency	0	0
Return on assets	9	0
Contributions	0	3
Benefits paid	(17)	(17)
Plan assets at end of period	269	277	291
Underfunded status	(75)	(30)
UK
Change in Projected Benefit Obligations (PBO) [Roll Forward]
PBO at beginning of period	0	0
Acquisition	810	0
Service cost	0	0
Interest cost	0	0
Assumption change	4	0
Currency	(24)	0
Actuarial loss (gain)	44	0
Benefits paid	(7)	0
PBO at end of period	827	0	0
Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of period	0	0
Acquisition	702	0
Currency	(22)	0
Return on assets	51	0
Contributions	5	0
Benefits paid	(7)	0
Plan assets at end of period	729	0	0
Underfunded status	(98)	0
Mainland Europe [Member]
Change in Projected Benefit Obligations (PBO) [Roll Forward]
PBO at beginning of period	0	0
Acquisition	209	0
Service cost	2	0
Interest cost	0	0
Assumption change	1	0
Currency	(10)	0
Actuarial loss (gain)	8	0
Benefits paid	(4)	0
PBO at end of period	206	0	0
Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of period	0	0
Acquisition	70	0
Currency	(3)	0
Return on assets	2	0
Contributions	2	0
Benefits paid	(4)	0
Plan assets at end of period	67	0	$ 0
Underfunded status	(139)	$ 0
Germany
Change in Fair Value of Plan Assets [Roll Forward]
Underfunded status	$ (99)