Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	$ (17)	$ 303	$ 229
Net other comprehensive income (loss)			140
Other comprehensive loss before reclassifications	(727)	(462)
Amounts reclassified from accumulated other comprehensive income (loss)	344	98
Income tax (expense) benefit	27	44	(66)
Other comprehensive income (loss)	(356)	(320)	74
Balance at the end of the period	(373)	(17)	303
Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	720	931	959
Net other comprehensive income (loss)			(28)
Other comprehensive loss before reclassifications	(536)	(216)
Amounts reclassified from accumulated other comprehensive income (loss)	224	5
Other comprehensive income (loss)	(312)	(211)	(28)
Balance at the end of the period	408	720	931
Unrecognized Pension and Postretirement Benefit Costs
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	(692)	(569)	(700)
Net other comprehensive income (loss)			204
Other comprehensive loss before reclassifications	(147)	(211)
Amounts reclassified from accumulated other comprehensive income (loss)	75	44
Income tax (expense) benefit	26	44	(73)
Other comprehensive income (loss)	(46)	(123)	131
Balance at the end of the period	(738)	(692)	(569)
Gain (Loss) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period	(45)	(59)	(30)
Net other comprehensive income (loss)			(36)
Other comprehensive loss before reclassifications	(44)	(35)
Amounts reclassified from accumulated other comprehensive income (loss)	45	49
Income tax (expense) benefit	1		7
Other comprehensive income (loss)	2	14	(29)
Balance at the end of the period	(43)	(45)	(59)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income (loss)	$ (356)	$ (320)	$ 74