Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities Available-for-sale Securities (Details)

v3.8.0.1
Marketable Securities Available-for-sale Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 24, 2017
Dec. 25, 2016
Sep. 24, 2017
Contractual maturities of available-for-sale debt securities [Abstract]      
Years to Maturity - Less Than One Year $ 5,151    
Years to Maturity - One to Five Years 1,047    
Years to Maturity - Five to Ten Years 0    
Years to Maturity - Greater Than Ten Years 0    
Years to Maturity - No Single Maturity Date 245    
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]      
Gross Realized Gains 2 $ 248  
Gross Realized Losses 0 (109)  
Net Realized Gains 2 $ 139  
Available-for-sale Securities [Abstract]      
Available-for-sale Equity Securities, Cost 8   $ 8
Available-for-sale Equity Securities, Unrealized Gains 34   28
Available-for-sale Equity Securities, Unrealized Losses 0   0
Available-for-sale Securities Equity Securities, Fair Value 42   36
Available-for-sale Debt Securities (including debt funds), Cost 6,432   3,497
Available-for-sale Debt Securities (including debt funds), Unrealized Gains 14   13
Available-for-sale Debt Securities (including debt funds), Unrealized Losses (3)   (1)
Available-for-sale Debt Securities, Fair Value 6,443   3,509
Fair Value $ 6,485   $ 3,545