Annual report pursuant to Section 13 and 15(d)

Marketable Securities (Details)

v3.5.0.2
Marketable Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 25, 2016
Schedule of Marketable Securities [Line Items]      
Total marketable securities - Current $ 9,761   $ 12,702
Total marketable securities - Noncurrent 13,626   13,702
Trading Securities [Abstract]      
Trading - Current 0   0
Trading - Noncurrent 618   0
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 9,761   12,702
Available-for-sale - Noncurrent 12,228   13,702
U.S. Treasury securities and government-related securities [Member]      
Trading Securities [Abstract]      
Trading - Current 0   0
Trading - Noncurrent 12   0
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 156   1,116
Available-for-sale - Noncurrent 691   1,099
Corporate bonds and notes [Member]      
Trading Securities [Abstract]      
Trading - Current 0   0
Trading - Noncurrent 364   0
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 7,926   10,159
Available-for-sale - Noncurrent 7,112   8,584
Mortgage- and asset-backed and auction rate securities [Member]      
Trading Securities [Abstract]      
Trading - Current 0   0
Trading - Noncurrent 242   0
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 1,302   1,363
Available-for-sale - Noncurrent 263   534
Equity and preferred securities and equity funds [Member]      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 377   64
Available-for-sale - Noncurrent 1,253   1,682
Debt funds [Member]      
Schedule of Marketable Securities [Line Items]      
(Decrease) increase in fair value recognized in investment income (10) $ 33  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 0   0
Available-for-sale - Noncurrent 2,909   1,803
Fair Value Option [Abstract]      
Fair value option - Current 0   0
Fair value option - Noncurrent $ 780   $ 0