Goodwill and Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2013	Mar. 30, 2012	Mar. 29, 2013	Mar. 30, 2012	Sep. 28, 2012
Gross carrying amount and accumulated amortization of intangible assets:
Gross Carrying Amount, Amortizable	$ 2,190		$ 2,190		$ 2,192
Accumulated Amortization	1,755		1,755		1,722
Gross Carrying Amount, Non-Amortizable	300		300		301
Intangible asset amortization expense and estimated aggregate amortization expense ($ in millions):
Intangible asset amortization expense	26	26	51	51
Estimated aggregate amortization expense, remainder of 2013	50		50
Estimated aggregate amortization expense, 2014	80		80
Estimated aggregate amortization expense, 2015	67		67
Estimated aggregate amortization expense, 2016	62		62
Estimated aggregate amortization expense, 2017	51		51
Estimated aggregate amortization expense, 2018 and thereafter	125		125
Contracts and related customer relationships
Gross carrying amount and accumulated amortization of intangible assets:
Gross Carrying Amount, Amortizable	1,604		1,604		1,604
Accumulated Amortization	1,272		1,272		1,245
Intellectual Property
Gross carrying amount and accumulated amortization of intangible assets:
Gross Carrying Amount, Amortizable	549		549		552
Accumulated Amortization	470		470		468
Gross Carrying Amount, Non-Amortizable	223		223		224
Other Intangible Assets
Gross carrying amount and accumulated amortization of intangible assets:
Gross Carrying Amount, Amortizable	37		37		36
Accumulated Amortization	13		13		9
Franchise rights
Gross carrying amount and accumulated amortization of intangible assets:
Gross Carrying Amount, Non-Amortizable	$ 77		$ 77		$ 77