Quarterly report pursuant to Section 13 or 15(d)

Composition of Certain Financial Statement Items Investment Income, Net (Details)

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Composition of Certain Financial Statement Items Investment Income, Net (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Mar. 27, 2016
Mar. 29, 2015
Investment Income, Net [Abstract]        
Interest and dividend income $ 158 $ 138 $ 295 $ 272
Net realized gains on marketable securities 1 108 43 264
Net realized gains on other investments 23 3 30 13
Impairment losses on marketable securities (41) (27) (90) (89)
Impairment losses on other investments (2) (14) (16) (17)
Equity in net losses of investees (11) (9) (31) (13)
Other (1) 5 (5) 9
Investment income, net 127 $ 204 226 $ 439
Net impairment losses on marketable securities related to the noncredit portion of losses on debt securities recognized in other comprehensive income $ 13   $ 36