Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities Available-for-sale Securities (Details)

v3.7.0.1
Marketable Securities Available-for-sale Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 25, 2017
Jun. 26, 2016
Jun. 25, 2017
Jun. 26, 2016
Sep. 25, 2016
Contractual maturities of available-for-sale debt securities [Abstract]          
Years to Maturity - Less Than One Year $ 9,705   $ 9,705    
Years to Maturity - One to Five Years 9,910   9,910    
Years to Maturity - Five to Ten Years 1,046   1,046    
Years to Maturity - Greater Than Ten Years 1   1    
Years to Maturity - No Single Maturity Date 1,444   1,444    
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]          
Gross Realized Gains 119 $ 62 422 $ 146  
Gross Realized Losses (8) (8) (116) (30)  
Net Realized Gains 111 $ 54 306 $ 116  
Available-for-sale Securities [Abstract]          
Available-for-sale Equity Securities, Cost 5   5   $ 1,554
Available-for-sale Equity Securities, Unrealized Gains 27   27   204
Available-for-sale Equity Securities, Unrealized Losses 0   0   (12)
Available-for-sale Securities Equity Securities, Fair Value 32   32   1,746
Available-for-sale Debt Securities (including debt funds), Cost 21,981   21,981   24,363
Available-for-sale Debt Securities (including debt funds), Unrealized Gains 136   136   388
Available-for-sale Debt Securities (including debt funds), Unrealized Losses (11)   (11)   (93)
Available-for-sale Debt Securities, Fair Value 22,106   22,106   24,658
Available-for-sale Securities, Cost 21,986   21,986   25,917
Available-for-sale Securities, Unrealized Gains 163   163   592
Available-for-sale Securities, Unrealized Losses (11)   (11)   (105)
Fair Value 22,138   22,138   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 1,936   1,936   3,868
More than 12 months - Fair Value 46   46   1,699
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (11)   (11)   (24)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses 0   0   (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 205   205   444
More than 12 months - Fair Value 0   0   16
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (3)   (3)   (5)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses 0   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 1,680   1,680   2,775
More than 12 months - Fair Value 5   5   1,033
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (8)   (8)   (12)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses 0   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 51   51   337
More than 12 months - Fair Value 41   41   211
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses 0   0   (3)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses $ 0   $ 0   (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         0
More than 12 months - Fair Value         309
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses         0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses         $ (6)