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Composition of Certain Financial Statement Items Other Income, Costs and Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 25, 2018
Dec. 24, 2017
Mar. 26, 2017
Mar. 25, 2018
Mar. 26, 2017
Sep. 24, 2017
Restructuring and restructuring-related charges $ 310   $ 25   $ 33  
EC [Member]            
Loss contingency, loss in period   $ 1,180   $ 1,180    
KFTC [Member]            
Loss contingency, loss in period         $ 921 $ 927
Foreign currency losses related to KFTC accrual     $ 53