Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities Marketable Securities Table (Details)

v2.4.0.6
Marketable Securities Marketable Securities Table (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 25, 2012
Mar. 27, 2011
Mar. 25, 2012
Mar. 27, 2011
Sep. 25, 2011
Trading Securities [Abstract]          
Trading Securities - Current $ 502   $ 502   $ 0
Trading Securities - Noncurrent 502   502   0
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 8,579   8,579   6,190
Available-for-sale - Noncurrent 10,489   10,489   8,785
Fair Value Option [Abstract]          
Debt mutual fund - Current 0   0   0
Debt mutual fund - Noncurrent 498   498   476
Marketable Securities - Current 9,081   9,081   6,190
Marketable Securities - Noncurrent 11,489   11,489   9,261
Contractual maturities of available-for-sale debt securities [Abstract]          
Years to Maturity - Less Than One Year 1,397   1,397    
Years to Maturity - One to Five Years 6,334   6,334    
Years to Maturity - Five to Ten Years 2,735   2,735    
Years to Maturity - Greater Than Ten Years 1,143   1,143    
Years to Maturity - No Single Maturity Date 3,949   3,949    
Total 15,558   15,558    
Realized Gains and Losses on Sales of Available-for-sale Securities [Abstract]          
Gross Realized Gains 64 95 100 223  
Gross Realized Losses (4) (6) (6) (11)  
Net Realized Gains 60 89 94 212  
Available-for-sale Securities [Abstract]          
Cost 18,019   18,019   14,605
Unrealized Gains 1,105   1,105   572
Unrealized Losses (56)   (56)   (202)
Fair Value 19,068   19,068   14,975
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 4,338   4,338   4,482
Less than 12 months - Unrealized Losses (45)   (45)   (197)
More than 12 months - Fair Value 248   248   185
More than 12 months - Unrealized Losses (11)   (11)   (5)
Activity for Credit Loss Portion of Other-than-temporary Impairments on Debt Securities [Roll Forward]          
Beginning balance of credit losses 46 89 46 109  
Reductions in credit losses related to securities the Company intends to sell 0 (30) (1) (40)  
Additional credit losses recognized on securities previously impaired 2 0 3 0  
Credit losses recognized on securities previously not impaired 2 0 2 0  
Reductions in credit losses related to securities sold (4) (5) (4) (12)  
Accretion of credit losses due to an increase in cash flows expected to be collected 0 (2) 0 (5)  
Ending balance of credit losses 46 52 46 52  
U.S. Treasury securities and government-related securities [Member]
         
Trading Securities [Abstract]          
Trading Securities - Current 233   233   0
Trading Securities - Noncurrent 229   229   0
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 1,045   1,045   516
Available-for-sale - Noncurrent 12   12   6
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 523   523    
Less than 12 months - Unrealized Losses (1)   (1)    
More than 12 months - Fair Value 4   4    
More than 12 months - Unrealized Losses 0   0    
Corporate bonds and notes [Member]
         
Trading Securities [Abstract]          
Trading Securities - Current 269   269   0
Trading Securities - Noncurrent 117   117   0
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 4,867   4,867   3,665
Available-for-sale - Noncurrent 2,594   2,594   2,353
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 1,770   1,770   1,862
Less than 12 months - Unrealized Losses (9)   (9)   (41)
More than 12 months - Fair Value 21   21   41
More than 12 months - Unrealized Losses (2)   (2)   0
Mortgage- and asset-backed securities [Member]
         
Trading Securities [Abstract]          
Trading Securities - Current 0   0   0
Trading Securities - Noncurrent 65   65   0
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 1,117   1,117   587
Available-for-sale - Noncurrent 174   174   91
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 596   596    
Less than 12 months - Unrealized Losses (2)   (2)    
More than 12 months - Fair Value 9   9    
More than 12 months - Unrealized Losses 0   0    
Auction rate securities [Member]
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 0   0   0
Available-for-sale - Noncurrent 120   120   124
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 3   3   3
Less than 12 months - Unrealized Losses 0   0   0
More than 12 months - Fair Value 117   117   121
More than 12 months - Unrealized Losses (2)   (2)   (2)
Non-investment-grade debt securities [Member]
         
Trading Securities [Abstract]          
Trading Securities - Current 0   0   0
Trading Securities - Noncurrent 91   91   0
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 48   48   19
Available-for-sale - Noncurrent 4,249   4,249   3,653
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 761   761   1,867
Less than 12 months - Unrealized Losses (20)   (20)   (86)
More than 12 months - Fair Value 92   92   19
More than 12 months - Unrealized Losses (7)   (7)   (3)
Common and preferred stock [Member]
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 170   170   76
Available-for-sale - Noncurrent 2,044   2,044   1,713
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 208   208   750
Less than 12 months - Unrealized Losses (7)   (7)   (70)
More than 12 months - Fair Value 4   4   4
More than 12 months - Unrealized Losses 0   0   0
Equity mutual funds and exchange-traded funds [Member]
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 0   0   0
Available-for-sale - Noncurrent 1,296   1,296   845
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 159   159    
Less than 12 months - Unrealized Losses (5)   (5)    
More than 12 months - Fair Value 0   0    
More than 12 months - Unrealized Losses 0   0    
Debt mutual funds [Member]
         
Available-for-sale Securities [Abstract]          
Available-for-sale - Current 1,332   1,332   1,327
Available-for-sale - Noncurrent 0   0   0
Investments Classified as Available-for-sale in a Continuous Unrealized Loss Position Deemed to be Temporary [Abstract]          
Less than 12 months - Fair Value 318   318    
Less than 12 months - Unrealized Losses (1)   (1)    
More than 12 months - Fair Value 1   1    
More than 12 months - Unrealized Losses 0   0    
Equity securities [Member]
         
Available-for-sale Securities [Abstract]          
Cost 2,849   2,849   2,426
Unrealized Gains 673   673   278
Unrealized Losses (12)   (12)   (70)
Fair Value 3,510   3,510   2,634
Debt securities [Member]
         
Available-for-sale Securities [Abstract]          
Cost 15,170   15,170   12,179
Unrealized Gains 432   432   294
Unrealized Losses (44)   (44)   (132)
Fair Value $ 15,558   $ 15,558   $ 12,341