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 6 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Mar. 27, 2016
Mar. 29, 2015
Sep. 27, 2015
Contractual maturities of available-for-sale debt securities [Abstract]          
Years to Maturity - Less Than One Year $ 3,616   $ 3,616    
Years to Maturity - One to Five Years 11,239   11,239    
Years to Maturity - Five to Ten Years 2,187   2,187    
Years to Maturity - Greater Than Ten Years 753   753    
Years to Maturity - No Single Maturity Date 4,900   4,900    
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]          
Gross Realized Gains 34 $ 128 84 $ 308  
Gross Realized Losses (11) (30) (22) (37)  
Net Realized Gains 23 $ 98 62 $ 271  
Available-for-sale Securities [Abstract]          
Available-for-sale Equity Securities, Cost 1,283   1,283   $ 1,394
Available-for-sale Equity Securities, Unrealized Gains 242   242   264
Available-for-sale Equity Securities, Unrealized Losses (34)   (34)   (28)
Available-for-sale Securities Equity Securities, Fair Value 1,491   1,491   1,630
Available-for-sale Debt Securities (including debt funds), Cost 22,824   22,824   20,459
Available-for-sale Debt Securities (including debt funds), Unrealized Gains 196   196   185
Available-for-sale Debt Securities (including debt funds), Unrealized Losses (325)   (325)   (285)
Available-for-sale Debt Securities, Fair Value 22,695   22,695   20,359
Available-for-sale Securities, Cost 24,107   24,107   21,853
Available-for-sale Securities, Unrealized Gains 438   438   449
Available-for-sale Securities, Unrealized Losses (359)   (359)   (313)
Fair Value 24,186   24,186   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 11,399   11,399   11,006
More than 12 months - Fair Value 1,358   1,358   617
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (258)   (258)   (245)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (101)   (101)   (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 468   468   304
More than 12 months - Fair Value 39   39   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (3)   (3)   (4)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (1)   (1)   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 7,498   7,498   7,656
More than 12 months - Fair Value 1,065   1,065   368
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (117)   (117)   (93)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (93)   (93)   (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 1,122   1,122   862
More than 12 months - Fair Value 171   171   108
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (9)   (9)   (3)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses (2)   (2)   (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 358   358   392
More than 12 months - Fair Value 4   4   17
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (34)   (34)   (28)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses 0   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 1,953   1,953   1,792
More than 12 months - Fair Value 79   79   124
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized losses (95)   (95)   (117)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized losses $ (5)   $ (5)   $ (5)