Annual report pursuant to Section 13 and 15(d)

Capital Stock (Details)

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Capital Stock (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 07, 2012
Dec. 30, 2012
Sep. 30, 2012
Jun. 24, 2012
Mar. 25, 2012
Dec. 25, 2011
Sep. 25, 2011
Jun. 26, 2011
Mar. 27, 2011
Dec. 26, 2010
Sep. 26, 2010
Jun. 27, 2010
Mar. 28, 2010
Dec. 27, 2009
Sep. 30, 2012
Sep. 25, 2011
Sep. 26, 2010
Preferred Stock [Abstract]                                  
Shares of preferred stock authorized for issuance     8,000,000       8,000,000               8,000,000 8,000,000  
Number of preferred stock series                             one or more one or more  
Par value of preferred stock authorized for issuance     $ 0.0001       $ 0.0001               $ 0.0001 $ 0.0001  
Shares of preferred stock designated as series A junior participating preferred stock     4,000,000       4,000,000               4,000,000 4,000,000  
Preferred stock, shares outstanding     0       0               0 0  
Preferred Share Purchase Rights Agreement [Abstract]                                  
Purchase price of series A junior participating preferred stock     180                       180    
Minimum percentage of beneficial ownership by an acquiring person at which rights are exercisable     20.00%                       20.00%    
Expiration date of rights                             Sep. 25, 2015    
Redemption price per right     0.001                       0.001    
Stock Repurchase Program [Abstract]                                  
Authorized dollar amount for repurchase of common stock under current stock repurchase program                             $ 4,000,000,000    
Authorized dollar amount for repurchase of common stock under prior stock repurchase program                             3,000,000,000    
Authorized dollar amount remaining available under prior stock repurchase program, net of put options outstanding                             948,000,000    
Shares repurchased and retired, shares 4,132,000                           23,893,000 2,878,000 79,789,000
Shares repurchased and retired, amount, before commissions 240,000,000                           1,300,000,000 142,000,000 3,000,000,000
Authorized dollar amount remaining available under current stock repurchase program                             2,800,000,000    
Fair value of put options recorded in other current liabilities     0       80,000,000       0       0 80,000,000 0
Gains (losses) on put options recorded in net investment income                             80,000,000 (5,000,000) 0
Dividends [Abstract]                                  
Dividends charged to retained earnings - per share   $ 0.25 $ 0.250 $ 0.250 $ 0.215 $ 0.215 $ 0.215 $ 0.215 $ 0.190 $ 0.190 $ 0.190 $ 0.190 $ 0.170 $ 0.170 $ 0.930 $ 0.810 $ 0.720
Amount of increased quarterly dividend per share announced       $ 0.25       $ 0.215       $ 0.19          
Dividends charged to retained earnings - total     $ 438,000,000 $ 429,000,000 $ 377,000,000 $ 368,000,000 $ 368,000,000 $ 360,000,000 $ 319,000,000 $ 314,000,000 $ 305,000,000 $ 309,000,000 $ 279,000,000 $ 284,000,000 $ 1,612,000,000 $ 1,361,000,000 $ 1,177,000,000
Cash dividends, date announced                             Oct. 17, 2012    
Cash dividends, date payable                             Dec. 21, 2012    
Cash dividends, date of record                             Dec. 07, 2012