Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities Available-for-sale Securities (Details)

v3.6.0.2
Marketable Securities Available-for-sale Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 25, 2016
Dec. 27, 2015
Sep. 25, 2016
Contractual maturities of available-for-sale debt securities [Abstract]      
Years to Maturity - Less Than One Year $ 5,628    
Years to Maturity - One to Five Years 11,797    
Years to Maturity - Five to Ten Years 1,575    
Years to Maturity - Greater Than Ten Years 637    
Years to Maturity - No Single Maturity Date 2,699    
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]      
Gross Realized Gains 248 $ 50  
Gross Realized Losses (109) (12)  
Net Realized Gains 139 $ 38  
Available-for-sale Securities [Abstract]      
Available-for-sale Equity Securities, Cost 478   $ 1,554
Available-for-sale Equity Securities, Unrealized Gains 86   204
Available-for-sale Equity Securities, Unrealized Losses 0   (12)
Available-for-sale Securities Equity Securities, Fair Value 564   1,746
Available-for-sale Debt Securities (including debt funds), Cost 22,269   24,363
Available-for-sale Debt Securities (including debt funds), Unrealized Gains 111   388
Available-for-sale Debt Securities (including debt funds), Unrealized Losses (44)   (93)
Available-for-sale Debt Securities, Fair Value 22,336   24,658
Available-for-sale Securities, Cost 22,747   25,917
Available-for-sale Securities, Unrealized Gains 197   592
Available-for-sale Securities, Unrealized Losses (44)   (105)
Fair Value 22,900   26,404
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]      
Less than 12 months - Fair Value 2,522   3,868
More than 12 months - Fair Value 123   1,699
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (43)   (24)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (1)   (81)
U.S. Treasury securities and government-related securities [Member]      
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]      
Less than 12 months - Fair Value 263   444
More than 12 months - Fair Value 5   16
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (11)   (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses 0   0
Corporate bonds and notes [Member]      
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]      
Less than 12 months - Fair Value 1,681   2,775
More than 12 months - Fair Value 59   1,033
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (28)   (12)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses 0   (65)
Mortgage- and asset-backed and auction rate securities [Member]      
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]      
Less than 12 months - Fair Value 89   337
More than 12 months - Fair Value 59   211
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (2)   (3)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (1)   (2)
Equity and preferred securities and equity funds [Member]      
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]      
Less than 12 months - Fair Value     312
More than 12 months - Fair Value     130
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses     (4)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses     (8)
Debt funds [Member]      
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]      
Less than 12 months - Fair Value 489   0
More than 12 months - Fair Value 0   309
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (2)   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses $ 0   $ (6)