Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations (Details)

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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 25, 2012
Mar. 27, 2011
Mar. 25, 2012
Mar. 27, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date of completed sale of spectrum 12/27/2011   12/27/2011  
Proceeds from sale of spectrum $ 1,925   $ 1,925 $ 0
Gain in discontinued operations from sale of spectrum 1,179   1,179 0
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]        
Revenues 0 4 0 4
Income (loss) from discontinued operations 1,175 (361) 1,167 (502)
Income tax benefit (414) 92 (411) 151
Discontinued operations, net of income taxes 761 (269) [1] 756 (351) [1]
Disposal Group, Including Discontinued Operation, Classified Balance Sheet Disclosures [Abstract]        
Total carrying amount of assets of discontinued operations 135   135  
Total carrying amount of liabilities of discontinued operations 209   209  
Capital lease assets 119   119  
Capital lease liabilities $ 137   $ 137  
[1] As adjusted for discontinued operations (Note 8)