v2.4.0.8
Cash and Available-for-Sale Securities' Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value Recorded as Cash and Cash Equivalents or Short-Term or Long-Term Marketable Securities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2013
Sep. 28, 2013
Dec. 29, 2012
Sep. 29, 2012
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost $ 159,245 $ 147,143    
Unrealized Gains 412 414    
Unrealized Losses (815) (796)    
Fair Value 158,842 146,761    
Cash and Cash Equivalents 14,077 14,259 16,154 10,746
Short-term marketable securities 26,634 26,287    
Long-term marketable securities 118,131 106,215    
Cash
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 8,404 8,705    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Fair Value 8,404 8,705    
Cash and Cash Equivalents 8,404 8,705    
Short-term marketable securities 0 0    
Long-term marketable securities 0 0    
Level 1
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 6,281 [1] 5,792 [1]    
Unrealized Gains 0 [1] 0 [1]    
Unrealized Losses (248) [1] (197) [1]    
Fair Value 6,033 [1] 5,595 [1]    
Cash and Cash Equivalents 2,236 [1] 1,793 [1]    
Short-term marketable securities 3,797 [1] 3,802 [1]    
Long-term marketable securities 0 [1] 0 [1]    
Level 1 | Money market funds
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,236 [1] 1,793 [1]    
Unrealized Gains 0 [1] 0 [1]    
Unrealized Losses 0 [1] 0 [1]    
Fair Value 2,236 [1] 1,793 [1]    
Cash and Cash Equivalents 2,236 [1] 1,793 [1]    
Short-term marketable securities 0 [1] 0 [1]    
Long-term marketable securities 0 [1] 0 [1]    
Level 1 | Mutual funds
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 4,045 [1] 3,999 [1]    
Unrealized Gains 0 [1] 0 [1]    
Unrealized Losses (248) [1] (197) [1]    
Fair Value 3,797 [1] 3,802 [1]    
Cash and Cash Equivalents 0 [1] 0 [1]    
Short-term marketable securities 3,797 [1] 3,802 [1]    
Long-term marketable securities 0 [1] 0 [1]    
Level 2
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 144,560 [2] 132,646 [2]    
Unrealized Gains 412 [2] 414 [2]    
Unrealized Losses (567) [2] (599) [2]    
Fair Value 144,405 [2] 132,461 [2]    
Cash and Cash Equivalents 3,437 [2] 3,761 [2]    
Short-term marketable securities 22,837 [2] 22,485 [2]    
Long-term marketable securities 118,131 [2] 106,215 [2]    
Level 2 | U.S. Treasury Securities
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 39,177 [2] 27,642 [2]    
Unrealized Gains 11 [2] 24 [2]    
Unrealized Losses (62) [2] (47) [2]    
Fair Value 39,126 [2] 27,619 [2]    
Cash and Cash Equivalents 629 [2] 431 [2]    
Short-term marketable securities 8,498 [2] 7,554 [2]    
Long-term marketable securities 29,999 [2] 19,634 [2]    
Level 2 | U.S. agency securities
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 16,087 [2] 16,878 [2]    
Unrealized Gains 7 [2] 12 [2]    
Unrealized Losses (37) [2] (52) [2]    
Fair Value 16,057 [2] 16,838 [2]    
Cash and Cash Equivalents 1,016 [2] 177 [2]    
Short-term marketable securities 3,854 [2] 3,412 [2]    
Long-term marketable securities 11,187 [2] 13,249 [2]    
Level 2 | Non-U.S. government securities
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 5,470 [2] 5,545 [2]    
Unrealized Gains 25 [2] 35 [2]    
Unrealized Losses (141) [2] (137) [2]    
Fair Value 5,354 [2] 5,443 [2]    
Cash and Cash Equivalents 0 [2] 50 [2]    
Short-term marketable securities 276 [2] 313 [2]    
Long-term marketable securities 5,078 [2] 5,080 [2]    
Level 2 | Certificates of deposit and time deposits
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 1,438 [2] 2,344 [2]    
Unrealized Gains 0 [2] 0 [2]    
Unrealized Losses 0 [2] 0 [2]    
Fair Value 1,438 [2] 2,344 [2]    
Cash and Cash Equivalents 668 [2] 1,264 [2]    
Short-term marketable securities 494 [2] 844 [2]    
Long-term marketable securities 276 [2] 236 [2]    
Level 2 | Commercial Paper
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 2,212 [2] 2,998 [2]    
Unrealized Gains 0 [2] 0 [2]    
Unrealized Losses 0 [2] 0 [2]    
Fair Value 2,212 [2] 2,998 [2]    
Cash and Cash Equivalents 1,122 [2] 1,835 [2]    
Short-term marketable securities 991 [2] 1,163 [2]    
Long-term marketable securities 99 [2] 0 [2]    
Level 2 | Corporate Securities
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 57,709 [2] 54,586 [2]    
Unrealized Gains 297 [2] 275 [2]    
Unrealized Losses (221) [2] (252) [2]    
Fair Value 57,785 [2] 54,609 [2]    
Cash and Cash Equivalents 2 [2] 0 [2]    
Short-term marketable securities 7,658 [2] 8,077 [2]    
Long-term marketable securities 50,125 [2] 46,532 [2]    
Level 2 | Municipal securities
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 6,246 [2] 6,257 [2]    
Unrealized Gains 49 [2] 45 [2]    
Unrealized Losses (13) [2] (22) [2]    
Fair Value 6,282 [2] 6,280 [2]    
Cash and Cash Equivalents 0 [2] 4 [2]    
Short-term marketable securities 1,021 [2] 1,114 [2]    
Long-term marketable securities 5,261 [2] 5,162 [2]    
Level 2 | Mortgage and asset-backed securities
        
Schedule of Available-for-sale Securities [Line Items]        
Adjusted Cost 16,221 [2] 16,396 [2]    
Unrealized Gains 23 [2] 23 [2]    
Unrealized Losses (93) [2] (89) [2]    
Fair Value 16,151 [2] 16,330 [2]    
Cash and Cash Equivalents 0 [2] 0 [2]    
Short-term marketable securities 45 [2] 8 [2]    
Long-term marketable securities $ 16,106 [2] $ 16,322 [2]    
[1] The fair value of Level 1 securities is estimated based on quoted prices in active markets for identical assets or liabilities.
[2] The fair value of Level 2 securities is estimated based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.