Annual report pursuant to Section 13 and 15(d)

Marketable Securities Available-for-sale Securities (Details)

v3.10.0.1
Marketable Securities Available-for-sale Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Sep. 25, 2016
Contractual maturities of available-for-sale debt securities [Abstract]      
Years to maturity - less than one year $ 140    
Years to maturity - one to five years 4    
Years to maturity - no single maturity date 35    
Available For Sale Securities, Equity and Debt Gross Realized Gain (Loss) [Abstract]      
Gross realized gains 27 $ 553 $ 277
Gross realized losses (6) (127) (37)
Net realized gains 21 426 $ 240
Available-for-sale Securities [Abstract]      
Available-for-sale equity securities, cost 104 8  
Available-for-sale equity securities, unrealized gains 63 28  
Available-for-sale securities equity securities, fair value 167 36  
Available-for-sale debt securities (including debt funds), cost 179 3,497  
Available-for-sale debt securities (including debt funds), unrealized gains 0 13  
Available-for-sale debt securities (including debt funds), unrealized losses 0 (1)  
Available-for-sale debt securities, fair value 179 3,509  
Fair Value $ 346 $ 3,545