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Financial Instruments (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 25, 2016
Mar. 27, 2015
Mar. 25, 2016
Mar. 27, 2015
Sep. 25, 2015
Related Party Transaction [Line Items]          
Gain on investments, net     $ 114 $ 7  
Affiliated Entity          
Cost-method Investments, Realized Gain (Loss)          
Intercompany Loans Designated as Permanent $ 1,300   1,300   $ 1,400
Cumulative gain/(loss) on intercompany loans designated as permanent $ (25) $ (75) $ (59) $ (145)