Annual report pursuant to Section 13 and 15(d)

Investment Income (Details)

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Investment Income (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 28, 2014
Sep. 29, 2013
Sep. 30, 2012
Investment Income, Net [Abstract]      
Interest and dividend income $ 586 $ 697 $ 609
Interest expense (5) (23) (90)
Net realized gains on marketable securities 770 317 342
Net realized gains on other investments 56 52 27
Impairment losses on marketable securities (156) (72) (71)
Impairment losses on other investments (24) (13) (12)
Net gains on derivative instruments 5 0 84
Equity in losses of investees (10) (6) (9)
Net gains on deconsolidation of subsidiaries 6 12 0
Investment income, net 1,228 964 880
Net impairment losses on marketable securities related to the noncredit portion of losses on debt securities $ 0 $ 0 $ 0