Annual report pursuant to Section 13 and 15(d)

Marketable Securities (Details)

v3.8.0.1
Marketable Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 24, 2017
Sep. 27, 2015
Sep. 25, 2016
Schedule of Marketable Securities [Line Items]      
Available-for-sale - Current $ 2,275   $ 12,702
Available-for-sale - Noncurrent 1,270   13,702
Total marketable securities - Current 2,279   12,702
Total marketable securities - Noncurrent 1,270   13,702
U.S. Treasury securities and government-related securities [Member]      
Schedule of Marketable Securities [Line Items]      
Available-for-sale - Current 23   1,116
Available-for-sale - Noncurrent 959   1,099
Corporate bonds and notes [Member]      
Schedule of Marketable Securities [Line Items]      
Available-for-sale - Current 2,014   10,159
Available-for-sale - Noncurrent 271   8,584
Mortgage- and asset-backed and auction rate securities [Member]      
Schedule of Marketable Securities [Line Items]      
Available-for-sale - Current 93   1,363
Available-for-sale - Noncurrent 40   534
Equity and preferred securities and equity funds [Member]      
Schedule of Marketable Securities [Line Items]      
Available-for-sale - Current 36   64
Available-for-sale - Noncurrent 0   1,682
Debt funds [Member]      
Schedule of Marketable Securities [Line Items]      
Available-for-sale - Current 109   0
Available-for-sale - Noncurrent 0   1,803
Decrease in fair value recognized in investment and other income, net   $ 10  
Bank Time Deposits [Member]      
Schedule of Marketable Securities [Line Items]      
Other marketable securities - Current 4   0
Other Marketable securities - Noncurrent 0   $ 0
Time deposits, Total $ 4    
Minimum [Member]      
Schedule of Marketable Securities [Line Items]      
Maturity of Time Deposits 94 days    
Maximum [Member]      
Schedule of Marketable Securities [Line Items]      
Maturity of Time Deposits 285 days