Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

v3.7.0.1
Marketable Securities (Details) - USD ($)
$ in Millions
Mar. 26, 2017
Sep. 25, 2016
Schedule of Marketable Securities [Line Items]    
Total marketable securities - Current $ 2,858 $ 12,702
Total marketable securities - Noncurrent 18,876 13,702
U.S. Treasury securities and government-related securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-sale - Current 255 1,116
Available-for-sale - Noncurrent 836 1,099
Corporate bonds and notes [Member]    
Available-for-sale Securities [Abstract]    
Available-for-sale - Current 2,273 10,159
Available-for-sale - Noncurrent 16,057 8,584
Mortgage- and asset-backed and auction rate securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-sale - Current 156 1,363
Available-for-sale - Noncurrent 1,296 534
Equity and preferred securities and equity funds [Member]    
Available-for-sale Securities [Abstract]    
Available-for-sale - Current 70 64
Available-for-sale - Noncurrent 176 1,682
Debt funds [Member]    
Available-for-sale Securities [Abstract]    
Available-for-sale - Current 104 0
Available-for-sale - Noncurrent $ 511 $ 1,803