Annual report pursuant to Section 13 and 15(d)

Marketable Securities Marketable Securities Table (Details)

v2.4.0.8
Marketable Securities Marketable Securities Table (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Sep. 30, 2012
Schedule of Marketable Securities [Line Items]      
Available-for-sale Equity Securities, Amortized Cost Basis $ 1,769 $ 2,570  
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain 575 793  
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss (6) (44)  
Available-for-sale Securities, Equity Securities 2,338 3,319  
Marketable Securities - Current 9,658 8,824  
Marketable Securities - Noncurrent 14,457 14,440  
Trading Securities [Abstract]      
Trading Securities - Current 511 510  
Trading Securities - Noncurrent 642 409  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 9,147 8,314  
Available-for-sale - Noncurrent 13,025 13,494  
Contractual Maturities of Available-for-sale Debt Securities [Abstract]      
Years to Maturity - Less Than One Year 3,577    
Years to Maturity - One to Five Years 9,334    
Years to Maturity - Five to Ten Years 1,509    
Years to Maturity - Greater Than Ten Years 700    
Years to Maturity - No Single Maturity Date 4,714    
Total 19,834 18,489  
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]      
Gross Realized Gains 732 430 296
Gross Realized Losses (18) (142) (25)
Net Realized Gains 714 288 271
Available-for-sale Securities [Abstract]      
Available For Sale Securities Cost 21,351 20,825  
Available-for-sale Securities, Accumulated Gross Unrealized Gain 887 1,189  
Available-for-sale Securities, Accumulated Gross Unrealized Loss (66) (206)  
Available For Sale Securities Fair Value 22,172 21,808  
Available-for-sale Debt securities (including debt funds), Amortized Cost Basis 19,582 18,255  
Available-for-sale Debt securities (including debt funds), Accumulated Gross Unrealized Gain 312 396  
Available-for-sale Debt securities (including debt funds), Accumulated Gross Unrealized Loss (60) (162)  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 5,906 5,642  
Less than 12 months - Unrealized losses (38) (204)  
More than 12 months - Fair value 675 135  
More than 12 months - Unrealized losses (28) (2)  
Activity for Credit Loss Portion of Other-than-temporary Impairments on Debt Securities [Roll Forward]      
Beginning balance of credit losses 4 31  
Ending balance of credit losses 8 4 31
U.S. Treasury securities and government-related securities [Member]
      
Trading Securities [Abstract]      
Trading Securities - Current 320 241  
Trading Securities - Noncurrent 38 49  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 805 721  
Available-for-sale - Noncurrent 392 71  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 279 42  
Less than 12 months - Unrealized losses (2) (1)  
More than 12 months - Fair value 0 0  
More than 12 months - Unrealized losses 0 0  
Corporate bonds and notes [Member]
      
Trading Securities [Abstract]      
Trading Securities - Current 191 269  
Trading Securities - Noncurrent 367 256  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 6,274 4,533  
Available-for-sale - Noncurrent 7,649 6,812  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 4,924 2,084  
Less than 12 months - Unrealized losses (31) (31)  
More than 12 months - Fair value 104 24  
More than 12 months - Unrealized losses (4) (1)  
Mortgage- and asset-backed securities [Member]
      
Trading Securities [Abstract]      
Trading Securities - Current 0 0  
Trading Securities - Noncurrent 237 104  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 1,063 745  
Available-for-sale - Noncurrent 195 328  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 484 367  
Less than 12 months - Unrealized losses (1) (5)  
More than 12 months - Fair value 52 24  
More than 12 months - Unrealized losses (1) 0  
Auction rate securities [Member]
      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 0 0  
Available-for-sale - Noncurrent 83 83  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 0 0  
Less than 12 months - Unrealized losses 0 0  
More than 12 months - Fair value 83 83  
More than 12 months - Unrealized losses (1) (1)  
Common and preferred stock [Member]
      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 192 8  
Available-for-sale - Noncurrent 1,605 2,351  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 86 291  
Less than 12 months - Unrealized losses (3) (41)  
More than 12 months - Fair value 52 0  
More than 12 months - Unrealized losses (3) 0  
Equity funds [Member]
      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 0 0  
Available-for-sale - Noncurrent 541 960  
Debt funds [Member]
      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 813 2,307  
Available-for-sale - Noncurrent 2,560 2,889  
Fair Value Option [Abstract]      
Debt fund - Current 0 0  
Debt fund - Noncurrent 790 537  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 133 2,776  
Less than 12 months - Unrealized losses (1) (123)  
More than 12 months - Fair value 384 4  
More than 12 months - Unrealized losses $ (19) $ 0