Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

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Basis of Presentation (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 25, 2012
Mar. 27, 2011
Mar. 25, 2012
Mar. 27, 2011
Sep. 30, 2012
Sep. 25, 2011
Notes to Financial Statements [Abstract]            
Number of weeks in a fiscal period 13 weeks 13 weeks 26 weeks 26 weeks 53 weeks 52 weeks
Incremental Dilutive Common Share Equivalents [Abstract]            
Incremental dilutive common share equivalents (in shares) 44,100,000 34,955,000 40,576,000 30,231,000    
Accumulated Other Comprehensive Income (Loss) [Abstract]            
Other-than-temporary loss, not credit loss, net of tax, available-for-sale securities $ 10,000,000   $ 10,000,000     $ 13,000,000
Share-Based Compensation [Abstract]            
Share-based compensation expense related to share-based awards     82,000,000 38,000,000    
Incremental tax benefit from stock options exercised     98,000,000 132,000,000    
Total unrecognized compensation cost for non-vested stock options 441,000,000   441,000,000      
Total unrecognized compensation cost for non-vested employee restricted stock units $ 1,000,000,000   $ 1,000,000,000      
Weighted-average recognition period for non-vested employee stock options (in years)     1.6      
Weighted average recognition period for non-vested employee restricted stock units (in years)     2.1      
Net share-based awards granted, after forfeitures and cancellations, as a percentage of outstanding shares as of the beginning of each fiscal period     0.50% 0.30%    
Total share-based awards granted during the period as a percentage of outstanding shares as of the end of each fiscal period     0.60% 0.50%