Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

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Marketable Securities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 24, 2012
Jun. 30, 2013
Jun. 24, 2012
Sep. 30, 2012
Schedule of Marketable Securities [Line Items]          
Total marketable securities - Current $ 8,928   $ 8,928   $ 8,567
Total marketable securities - Noncurrent 18,941   18,941   14,463
Trading Securities [Abstract]          
Trading - Current 501   501   479
Trading - Noncurrent 731   731   550
Net gains (losses) recognized on debt securities classified as trading that are still held at the end of the period (21) (6) (36) 4  
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 8,427   8,427   8,088
Available-for-sale - Noncurrent 17,676   17,676   13,393
Fair Value Option [Abstract]          
Effective ownership interest in debt fund (fair value option) 21.00%   21.00%    
U.S. Treasury securities and government-related securities [Member]
         
Trading Securities [Abstract]          
Trading - Current 225   225   196
Trading - Noncurrent 239   239   254
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 251   251   362
Available-for-sale - Noncurrent 971   971   592
Corporate bonds and notes [Member]
         
Trading Securities [Abstract]          
Trading - Current 276   276   283
Trading - Noncurrent 307   307   176
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 4,711   4,711   4,554
Available-for-sale - Noncurrent 9,735   9,735   7,570
Mortgage- and asset-backed securities [Member]
         
Trading Securities [Abstract]          
Trading - Current 0   0   0
Trading - Noncurrent 185   185   120
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 1,031   1,031   1,157
Available-for-sale - Noncurrent 341   341   241
Auction rate securities [Member]
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 0   0   0
Available-for-sale - Noncurrent 83   83   118
Common and preferred stock [Member]
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 22   22   57
Available-for-sale - Noncurrent 2,338   2,338   2,030
Debt funds [Member]
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 2,412   2,412   1,958
Available-for-sale - Noncurrent 2,854   2,854   1,716
Fair Value Option [Abstract]          
Fair value option - Current 0   0   0
Fair value option - Noncurrent 534   534   520
Decrease (Increase) in fair value recognized in investment income 4 (5) (14) (27)  
Equity funds [Member]
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 0   0   0
Available-for-sale - Noncurrent $ 1,354   $ 1,354   $ 1,126