Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

v3.8.0.1
Marketable Securities (Details) - USD ($)
$ in Millions
Mar. 25, 2018
Sep. 24, 2017
Schedule of Marketable Securities [Line Items]    
Available-for-sale - Current $ 1,623 $ 2,275
Available-for-sale - Noncurrent 35 1,270
Total marketable securities - Current 1,625 2,279
Total marketable securities - Noncurrent 35 1,270
U.S. Treasury securities and government-related securities [Member]    
Schedule of Marketable Securities [Line Items]    
Available-for-sale - Current 12 23
Available-for-sale - Noncurrent 0 959
Corporate bonds and notes [Member]    
Schedule of Marketable Securities [Line Items]    
Available-for-sale - Current 1,498 2,014
Available-for-sale - Noncurrent 0 271
Mortgage- and asset-backed and auction rate securities [Member]    
Schedule of Marketable Securities [Line Items]    
Available-for-sale - Current 73 93
Available-for-sale - Noncurrent 35 40
Equity and preferred securities and equity funds [Member]    
Schedule of Marketable Securities [Line Items]    
Available-for-sale - Current 40 36
Available-for-sale - Noncurrent 0 0
Debt funds [Member]    
Schedule of Marketable Securities [Line Items]    
Available-for-sale - Current 0 109
Available-for-sale - Noncurrent 0 0
Bank Time Deposits [Member]    
Schedule of Marketable Securities [Line Items]    
Other Marketable Securities, Current 2 4
Other Marketable Securities, Noncurrent $ 0 $ 0