Retirement Plans (Details 3) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2015	Sep. 26, 2014
U.S. Plans
Change in net loss:
Unrecognized net loss at beginning of fiscal year	$ 325	$ 320
Current year change recorded in accumulated other comprehensive income (loss)	136	30
Amortization reclassified to earnings	(25)	(25)
Unrecognized net loss at end of fiscal year	436	325
Estimated amortization of actuarial losses from accumulated other comprehensive income into net periodic pension benefit cost in next fiscal year
Amortization of net actuarial loss	40
Non-U.S. Plans
Change in net loss:
Unrecognized net loss at beginning of fiscal year	748	592
Current year change recorded in accumulated other comprehensive income (loss)	18	180
Amortization reclassified to earnings	(55)	(24)
Unrecognized net loss at end of fiscal year	711	748
Change in prior service credit:
Unrecognized prior service credit at beginning of fiscal year	(67)	(68)
Current year change recorded in accumulated other comprehensive income (loss)	(4)	(4)
Amortization reclassified to earnings	5	5
Unrecognized prior service credit at end of fiscal year	(66)	$ (67)
Estimated amortization of actuarial losses from accumulated other comprehensive income into net periodic pension benefit cost in next fiscal year
Amortization of net actuarial loss	36
Amortization of prior service credit	$ 6