Annual report pursuant to Section 13 and 15(d)

Composition of Certain Financial Statement Captions (Details)

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Composition of Certain Financial Statement Captions (Details) (USD $)
 12 Months Ended
Sep. 25, 2011
Sep. 26, 2010
Sep. 27, 2009
Accounts Receivable [Abstract]      
Allowance for doubtful accounts $ 2,000,000 $ 3,000,000  
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense 704,000,000 437,000,000 428,000,000
Gross book values of property under capital leases 175,000,000 227,000,000  
Capital lease additions 1,000,000 40,000,000 50,000,000
Buildings and improvements and leasehold improvements leased to third parties or held for lease to third parties, net book value 19,000,000 38,000,000  
Buildings and improvements and leasehold improvements leased to third parties or held for lease to third parties, accumulated depreciation and amortization 8,000,000 8,000,000  
Future minimum rental income - fiscal 2012 5,000,000    
Future minimum rental income - fiscal 2013 3,000,000    
Future minimum rental income - fiscal 2014 2,000,000    
Future minimum rental income - fiscal 2015 1,000,000    
Future minimum rental income - after fiscal 2015 0    
Goodwill and Other Intangible Assets [Abstract]      
Goodwill impairment 114,000,000 0 0
Goodwill balance for Firethorn reporting unit 40,000,000    
Carrying value of spectrum held for sale 746,000,000 0  
Wireless licenses not subject to amortization 16,000,000    
Amortization expense related to intangible assets 357,000,000 227,000,000 207,000,000
Expected Amortization Expense for Intangible Assets [Abstract]      
Expected amortization expense - fiscal 2012 457,000,000    
Expected amortization expense - fiscal 2013 438,000,000    
Expected amortization expense - fiscal 2014 426,000,000    
Expected amortization expense - fiscal 2015 385,000,000    
Expected amortization expense - fiscal 2016 277,000,000    
Expected amortization expense - after fiscal 2016 $ 1,100,000,000