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Composition of Certain Financial Statement Items Investment and Other Income, Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 24, 2018
Jun. 25, 2017
Jun. 24, 2018
Jun. 25, 2017
Investment Income, Net [Abstract]        
Interest and dividend income $ 182 $ 147 $ 461 $ 466
Net realized gains on marketable securities 10 124 24 330
Net realized gains on other investments 16 15 77 45
Impairment losses on marketable securities 0 (2) (1) (127)
Impairment losses on other investments (19) (13) (39) (36)
Net (losses) gains on derivative investments (30) 4 (21) 25
Equity in net losses of investees (28) (31) (67) (42)
Net gains (losses) on foreign currency transactions 112 (26) 20 (26)
Investment and other income, net $ 243 $ 218 $ 454 $ 635