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. 29, 2014
Jun. 30, 2013
Jun. 29, 2014
Jun. 30, 2013
Sep. 29, 2013
Schedule of Marketable Securities [Line Items]          
Total marketable securities - Current $ 10,209   $ 10,209   $ 8,824
Total marketable securities - Noncurrent 14,563   14,563   14,440
Trading Securities [Abstract]          
Trading - Current 512   512   510
Trading - Noncurrent 642   642   409
Net gains (losses) recognized on debt securities classified as trading held at the end of the period 7 (21) 8 (36)  
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 9,697   9,697   8,314
Available-for-sale - Noncurrent 13,134   13,134   13,494
Fair Value Option [Abstract]          
Effective ownership interest in debt fund (fair value option) 27.00%   27.00%    
U.S. Treasury securities and government-related securities [Member]
         
Trading Securities [Abstract]          
Trading - Current 317   317   241
Trading - Noncurrent 47   47   49
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 872   872   721
Available-for-sale - Noncurrent 390   390   71
Corporate bonds and notes
         
Trading Securities [Abstract]          
Trading - Current 195   195   269
Trading - Noncurrent 380   380   256
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 6,553   6,553   4,533
Available-for-sale - Noncurrent 7,687   7,687   6,812
Mortgage- and asset-backed securities
         
Trading Securities [Abstract]          
Trading - Current 0   0   0
Trading - Noncurrent 215   215   104
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 860   860   745
Available-for-sale - Noncurrent 200   200   328
Auction rate securities
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 0   0   0
Available-for-sale - Noncurrent 83   83   83
Common and preferred stock
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 342   342   8
Available-for-sale - Noncurrent 1,664   1,664   2,351
Equity funds
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 160   160   0
Available-for-sale - Noncurrent 521   521   960
Debt funds
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 910   910   2,307
Available-for-sale - Noncurrent 2,589   2,589   2,889
Fair Value Option [Abstract]          
Fair value option - Current 0   0   0
Fair value option - Noncurrent 787   787   537
Increase (decrease) in fair value recognized in investment income $ 12 $ (4) $ 30 $ 14