Annual report pursuant to Section 13 and 15(d)

Marketable Securities (Details)

v3.10.0.1
Marketable Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 24, 2017
Schedule of Marketable Securities [Line Items]    
Available-for-sale - current $ 311 $ 2,275
Available-for-sale - noncurrent 35 1,270
Total marketable securities - current 311 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 0 23
Available-for-sale - noncurrent 0 959
Corporate bonds and notes [Member]    
Schedule of Marketable Securities [Line Items]    
Available-for-sale - current 144 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 0 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 167 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]    
Total marketable securities - current 0 4
Total marketable securities - noncurrent $ 0 $ 0