Annual report pursuant to Section 13 and 15(d)

Marketable Securities Marketable Securities Table (Details)

v2.4.0.6
Marketable Securities Marketable Securities Table (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 25, 2011
Sep. 26, 2010
Trading Securities [Abstract]      
Trading Securities - Current $ 479 $ 0  
Trading Securities - Noncurrent 550 0  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 8,088 6,190  
Available-for-sale - Noncurrent 13,393 8,785  
Fair Value Option [Abstract]      
Debt fund - Current 0 0  
Debt fund - Noncurrent 520 476  
Marketable Securities - Current 8,567 6,190  
Marketable Securities - Noncurrent 14,463 9,261  
Contractual Maturities of Available-for-sale Debt Securities [Abstract]      
Years to Maturity - Less Than One Year 535    
Years to Maturity - One to Five Years 7,633    
Years to Maturity - Five to Ten Years 3,573    
Years to Maturity - Greater Than Ten Years 1,336    
Years to Maturity - No Single Maturity Date 5,191    
Total 18,268    
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]      
Gross Realized Gains 296 356 415
Gross Realized Losses (25) (30) (31)
Net Realized Gains 271 326 384
Available-for-sale Securities [Abstract]      
Cost 20,313 14,605  
Unrealized Gains 1,201 572  
Unrealized Losses (33) (202)  
Fair Value 21,481 14,975  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 1,035 4,482  
Less than 12 months - Unrealized losses (18) (197)  
More than 12 months - Fair value 423 185  
More than 12 months - Unrealized losses (15) (5)  
Activity for Credit Loss Portion of Other-than-temporary Impairments on Debt Securities [Roll Forward]      
Beginning balance of credit losses 46 109 170
Reductions in credit losses related to securities the Company intends to sell (1) (40) 0
Credit losses recognized on securities previously not impaired 5 2 1
Additional credit losses recognized on securities previously impaired 2 0 1
Reductions in credit losses related to securities sold (21) (20) (39)
Accretion of credit losses due to an increase in cash flows expected to be collected 0 (5) (24)
Ending balance of credit losses 31 46 109
U.S. Treasury securities and government-related securities [Member]
     
Trading Securities [Abstract]      
Trading Securities - Current 196 0  
Trading Securities - Noncurrent 254 0  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 362 516  
Available-for-sale - Noncurrent 592 6  
Corporate bonds and notes [Member]
     
Trading Securities [Abstract]      
Trading Securities - Current 283 0  
Trading Securities - Noncurrent 176 0  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 4,554 3,665  
Available-for-sale - Noncurrent 7,570 4,900  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 723 3,576  
Less than 12 months - Unrealized losses (8) (125)  
More than 12 months - Fair value 256 59  
More than 12 months - Unrealized losses (9) (3)  
Mortgage- and asset-backed securities [Member]
     
Trading Securities [Abstract]      
Trading Securities - Current 0 0  
Trading Securities - Noncurrent 120 0  
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 1,157 606  
Available-for-sale - Noncurrent 241 99  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 143    
Less than 12 months - Unrealized losses (1)    
More than 12 months - Fair value 7    
More than 12 months - Unrealized losses 0    
Auction rate securities [Member]
     
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 0 0  
Available-for-sale - Noncurrent 118 124  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 0 3  
Less than 12 months - Unrealized losses 0 0  
More than 12 months - Fair value 115 121  
More than 12 months - Unrealized losses (1) (2)  
Common and preferred stock [Member]
     
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 57 76  
Available-for-sale - Noncurrent 2,030 1,713  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 105 495  
Less than 12 months - Unrealized losses (5) (43)  
More than 12 months - Fair value 9 4  
More than 12 months - Unrealized losses 0 0  
Equity funds [Member]
     
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 0 0  
Available-for-sale - Noncurrent 1,126 845  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value 64 255  
Less than 12 months - Unrealized losses (4) (27)  
More than 12 months - Fair value 36 0  
More than 12 months - Unrealized losses (5) 0  
Debt funds [Member]
     
Available-for-sale Securities [Abstract]      
Available-for-sale - Current 1,958 1,327  
Available-for-sale - Noncurrent 1,716 1,098  
Investments in a Continuous Unrealized Loss Position [Abstract]      
Less than 12 months - Fair value   153  
Less than 12 months - Unrealized losses   (2)  
More than 12 months - Fair value   1  
More than 12 months - Unrealized losses   0  
Equity Securities [Member]
     
Available-for-sale Securities [Abstract]      
Cost 2,599 2,426  
Unrealized Gains 628 278  
Unrealized Losses (14) (70)  
Fair Value 3,213 2,634  
Debt Securities (including debt funds) [Member]
     
Available-for-sale Securities [Abstract]      
Cost 17,714 12,179  
Unrealized Gains 573 294  
Unrealized Losses (19) (132)  
Fair Value $ 18,268 $ 12,341