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Marketable Securities Marketable Securities Table (Details) (USD $)
In Millions
12 Months Ended
Sep. 25, 2011
Sep. 26, 2010
Sep. 27, 2009
Available-for-sale Securities [Abstract]   
Available-for-sale - Current$ 6,190$ 6,332 
Available-for-sale - Noncurrent8,7857,656 
Fair Value Option [Abstract]   
Debt mutual fund - Current00 
Debt mutual fund - Noncurrent476467 
Time deposits - Current0400 
Time deposits - Noncurrent00 
Marketable Securities - Current6,1906,732 
Marketable Securities - Noncurrent9,2618,123 
Contractual Maturities of Available-for-sale Debt Securities [Abstract]   
Years to Maturity - Less Than One Year1,084  
Years to Maturity - One to Five Years4,600  
Years to Maturity - Five to Ten Years2,450  
Years to Maturity - Greater Than Ten Years952  
Years to Maturity - No Single Maturity Date3,255  
Total12,341  
Realized Gains and Losses on Sales of Available-for-sale Marketable Securities [Abstract]   
Gross Realized Gains356415215
Gross Realized Losses(30)(31)(79)
Net Realized Gains326384136
Available-for-sale Securities [Abstract]   
Cost14,60513,104 
Unrealized Gains572915 
Unrealized Losses(202)(31) 
Fair Value14,97513,988 
Investments in a Continuous Unrealized Loss Position [Abstract]   
Less than 12 months - Fair value4,4821,131 
Less than 12 months - Unrealized losses(197)(19) 
More than 12 months - Fair value185242 
More than 12 months - Unrealized losses(5)(12) 
Activity for Credit Loss Portion of Other-than-temporary Impairments on Debt Securities [Roll Forward]   
Beginning balance of credit losses1091700
Credit losses remaining in retained earnings upon adoption00186
Reductions in credit losses related to securities the Company intends to sell(40)0(14)
Credit losses recognized on securities previously not impaired2117
Additional credit losses recognized on securities previously impaired012
Reductions in credit losses related to securities sold(20)(39)(21)
Accretion of credit losses due to an increase in cash flows expected to be collected(5)(24)0
Ending balance of credit losses46109170
U.S. Treasury securities and government-related securities [Member]
   
Available-for-sale Securities [Abstract]   
Available-for-sale - Current516650 
Available-for-sale - Noncurrent64 
Corporate bonds and notes [Member]
   
Available-for-sale Securities [Abstract]   
Available-for-sale - Current3,6653,504 
Available-for-sale - Noncurrent2,3531,495 
Investments in a Continuous Unrealized Loss Position [Abstract]   
Less than 12 months - Fair value1,862425 
Less than 12 months - Unrealized losses(41)(1) 
More than 12 months - Fair value4123 
More than 12 months - Unrealized losses00 
Mortgage- and asset-backed securities [Member]
   
Available-for-sale Securities [Abstract]   
Available-for-sale - Current587629 
Available-for-sale - Noncurrent9138 
Auction rate securities [Member]
   
Available-for-sale Securities [Abstract]   
Available-for-sale - Current00 
Available-for-sale - Noncurrent124126 
Investments in a Continuous Unrealized Loss Position [Abstract]   
Less than 12 months - Fair value30 
Less than 12 months - Unrealized losses00 
More than 12 months - Fair value121126 
More than 12 months - Unrealized losses(2)(4) 
Non-investment-grade debt securities [Member]
   
Available-for-sale Securities [Abstract]   
Available-for-sale - Current1921 
Available-for-sale - Noncurrent3,6533,344 
Investments in a Continuous Unrealized Loss Position [Abstract]   
Less than 12 months - Fair value1,867296 
Less than 12 months - Unrealized losses(86)(7) 
More than 12 months - Fair value1990 
More than 12 months - Unrealized losses(3)(8) 
Common and preferred stock [Member]
   
Available-for-sale Securities [Abstract]   
Available-for-sale - Current7652 
Available-for-sale - Noncurrent1,7131,670 
Investments in a Continuous Unrealized Loss Position [Abstract]   
Less than 12 months - Fair value750133 
Less than 12 months - Unrealized losses(70)(10) 
More than 12 months - Fair value43 
More than 12 months - Unrealized losses00 
Equity mutual and exchange-traded funds [Member]
   
Available-for-sale Securities [Abstract]   
Available-for-sale - Current00 
Available-for-sale - Noncurrent845979 
Investments in a Continuous Unrealized Loss Position [Abstract]   
Less than 12 months - Fair value 277 
Less than 12 months - Unrealized losses (1) 
More than 12 months - Fair value 0 
More than 12 months - Unrealized losses 0 
Debt mutual funds [Member]
   
Available-for-sale Securities [Abstract]   
Available-for-sale - Current1,3271,476 
Available-for-sale - Noncurrent00 
Equity Securities [Member]
   
Available-for-sale Securities [Abstract]   
Cost2,4262,309 
Unrealized Gains278403 
Unrealized Losses(70)(11) 
Fair Value2,6342,701 
Debt Securities [Member]
   
Available-for-sale Securities [Abstract]   
Cost12,17910,795 
Unrealized Gains294512 
Unrealized Losses(132)(20) 
Fair Value$ 12,341$ 11,287