Equity and Comprehensive Income (Details 3) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 25, 2016	Mar. 27, 2015	Mar. 25, 2016	Mar. 27, 2015	Sep. 25, 2015	Sep. 26, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	$ 29	$ 0	$ 29	$ 0
Components of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	(1,829)		(1,829)		$ (1,841)
Other comprehensive loss, net of tax	49	(172)	12	(365)
Selling, General and Administrative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax			7
Discontinued Operations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax			2
Accumulated Translation Adjustment
Components of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	(1,232)	(1,067)	(1,232)	(1,067)	(1,233)	$ (693)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(28)	(374)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			29	0
Other comprehensive loss, net of tax			1	(374)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Components of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	(6)		(6)		(9)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
Other comprehensive loss, net of tax			3
Retirement Plans
Components of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	(591)	(523)	(591)	(523)	(599)	(532)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			8	9
Other comprehensive loss, net of tax			8	9
Accumulated Other Comprehensive Loss
Components of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss	$ (1,829)	$ (1,590)	(1,829)	(1,590)	$ (1,841)	$ (1,225)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(25)	(374)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			37	9
Other comprehensive loss, net of tax			$ 12	$ (365)