Annual report pursuant to Section 13 and 15(d)

Marketable Securities (Details)

v3.3.0.814
Marketable Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 29, 2013
Trading Securities [Abstract]      
Trading - Current $ 0 $ 511  
Trading - Noncurrent 618 642  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 9,761 9,147  
Available-for-sale - Noncurrent 12,228 13,025  
Fair Value Option [Abstract]      
Total marketable securities - Current 9,761 9,658  
Total marketable securities - Noncurrent $ 13,626 14,457  
Effective ownership interest in debt fund (fair value option) 25.00%    
(Decrease) increase in fair value recognized in investment income $ (10) 33 $ 17
Net losses recognized on debt securities classified as trading held at the end of the period     $ (20)
Ending balance of the credit loss portion of other-than-temporary impairments on debt securities 12    
U.S. Treasury securities and government-related securities [Member]      
Trading Securities [Abstract]      
Trading - Current 0 320  
Trading - Noncurrent 12 38  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 156 805  
Available-for-sale - Noncurrent 691 392  
Corporate bonds and notes      
Trading Securities [Abstract]      
Trading - Current 0 191  
Trading - Noncurrent 364 367  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 7,926 6,274  
Available-for-sale - Noncurrent 7,112 7,649  
Mortgage- and asset-backed and auction rate securities [Member]      
Trading Securities [Abstract]      
Trading - Current 0 0  
Trading - Noncurrent 242 237  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 1,302 1,063  
Available-for-sale - Noncurrent 263 278  
Equity and preferred securities and equity funds      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 377 192  
Available-for-sale - Noncurrent 1,253 2,146  
Debt funds      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 0 813  
Available-for-sale - Noncurrent 2,909 2,560  
Fair Value Option [Abstract]      
Fair value option - Current 0 0  
Fair value option - Noncurrent $ 780 $ 790