Retirement Plans (Details 2) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Amounts recognized on the Consolidated Balance Sheets:
Long-term pension and postretirement liabilities	$ (1,327)	$ (1,280)
U.S. Plans
Change in benefit obligation:
Benefit obligation at beginning of fiscal year	1,143	1,074
Service cost	9	7	$ 6
Interest cost	48	50	46
Actuarial loss	42	90
Benefits and administrative expenses paid	(74)	(77)
Other	2	(1)
Benefit obligation at end of fiscal year	1,170	1,143	1,074
Change in plan assets:
Fair value of plan assets at beginning of fiscal year	978	931
Actual return on plan assets	(26)	123
Employer contributions	1	2
Benefits and administrative expenses paid	(74)	(77)
Other		(1)
Fair value of plan assets at end of fiscal year	879	978	931
Funded status	(291)	(165)
Amounts recognized on the Consolidated Balance Sheets:
Accrued and other current liabilities	(5)	(4)
Long-term pension and postretirement liabilities	(286)	(161)
Net amount recognized	$ (291)	$ (165)
Weighted-average assumptions used to determine pension benefit obligation at fiscal year end:
Discount rate (as a percent)	4.38%	4.34%
Non-U.S. Plans
Change in benefit obligation:
Benefit obligation at beginning of fiscal year	$ 2,276	$ 2,106
Service cost	45	46	50
Interest cost	58	71	68
Actuarial loss	87	256
Benefits and administrative expenses paid	(71)	(75)
Currency translation	(213)	(94)
Other	6	(34)
Benefit obligation at end of fiscal year	2,188	2,276	2,106
Change in plan assets:
Fair value of plan assets at beginning of fiscal year	1,177	1,113
Actual return on plan assets	72	97
Employer contributions	65	85
Benefits and administrative expenses paid	(71)	(75)
Currency translation	(90)	(32)
Other	14	(11)
Fair value of plan assets at end of fiscal year	1,167	1,177	$ 1,113
Funded status	(1,021)	(1,099)
Amounts recognized on the Consolidated Balance Sheets:
Accrued and other current liabilities	(19)	(21)
Long-term pension and postretirement liabilities	(1,002)	(1,078)
Net amount recognized	$ (1,021)	$ (1,099)
Weighted-average assumptions used to determine pension benefit obligation at fiscal year end:
Discount rate (as a percent)	2.50%	2.77%
Rate of compensation increase (as a percent)	2.81%	2.86%