Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations (Details)

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Discontinued Operations (Details) (USD $)
3 Months Ended
Mar. 25, 2012
Dec. 25, 2011
Dec. 26, 2010
Dec. 27, 2011
Sep. 25, 2011
Notes to Financial Statements [Abstract]          
Date of completed sale of spectrum licenses 12/27/2011        
Proceeds from sale of spectrum licenses       $ 1,900,000,000  
Gain in discontinued operations from sale of spectrum licenses       1,200,000,000  
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]          
Revenues   0 0    
Income (loss) from discontinued operations   (8,000,000) (141,000,000)    
Income tax benefit   3,000,000 59,000,000    
Discontinued operations, net of income taxes   (5,000,000) (82,000,000) [1]    
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]          
Total carrying amount of assets of discontinued operations   901,000,000      
Total carrying amount of liabilities of discontinued operations   225,000,000      
Spectrum held for sale   746,000,000     746,000,000
Capital lease assets   130,000,000      
Capital lease liabilities   $ 149,000,000      
[1] As adjusted for discontinued operations (Note 8)