Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities Available-for-sale Securities (Details)

v3.3.1.900
Marketable Securities Available-for-sale Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 27, 2015
Dec. 28, 2014
Sep. 27, 2015
Contractual maturities of available-for-sale debt securities [Abstract]      
Years to Maturity - Less Than One Year $ 3,142    
Years to Maturity - One to Five Years 10,947    
Years to Maturity - Five to Ten Years 1,721    
Years to Maturity - Greater Than Ten Years 643    
Years to Maturity - No Single Maturity Date 4,507    
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]      
Gross Realized Gains 50 $ 180  
Gross Realized Losses (12) (8)  
Net Realized Gains 38 $ 172  
Available-for-sale Securities [Abstract]      
Available-for-sale Equity Securities, Cost 1,266   $ 1,394
Available-for-sale Equity Securities, Unrealized Gains 251   264
Available-for-sale Equity Securities, Unrealized Losses (22)   (28)
Available-for-sale Securities Equity Securities, Fair Value 1,495   1,630
Available-for-sale Debt Securities (including debt funds), Cost 21,234   20,459
Available-for-sale Debt Securities (including debt funds), Unrealized Gains 132   185
Available-for-sale Debt Securities (including debt funds), Unrealized Losses (406)   (285)
Available-for-sale Debt Securities, Fair Value 20,960   20,359
Cost 22,500   21,853
Available-for-sale Securities, Unrealized Gains 383   449
Available-for-sale Securities, Unrealized Losses (428)   (313)
Fair Value 22,455   21,989
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]      
Less than 12 months - Fair Value 14,777   11,006
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (311)   (245)
More than 12 months - Fair Value 1,221   617
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (117)   (68)
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 808   304
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (12)   (4)
More than 12 months - Fair Value 20   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (2)   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 10,466   7,656
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (132)   (93)
More than 12 months - Fair Value 956   368
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (108)   (62)
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 1,220   862
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (7)   (3)
More than 12 months - Fair Value 164   108
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (1)   (1)
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 360   392
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (22)   (28)
More than 12 months - Fair Value 2   17
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses 0   0
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 1,923   1,792
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (138)   (117)
More than 12 months - Fair Value 79   124
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses $ (6)   $ (5)