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Composition of Certain Financial Statement Items Other Income, Costs and Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 24, 2017
Sep. 30, 2018
Sep. 24, 2017
Sep. 25, 2016
Restructuring and restructuring related charges       $ 37 $ 202
Gain on sale of wireless spectrum     $ 0 0 (380)
Proceeds from sale of wireless spectrum     0 0 232
Deferred payments from sale of wireless spectrum         275
Gain on disposition of business         $ 48
Other Expense [Member]          
Restructuring and restructuring related charges     629    
Minimum [Member]          
Deferred payments from sales of wireless spectrum, Due date         Jan. 01, 2020
Maximum [Member]          
Deferred payments from sales of wireless spectrum, Due date         Dec. 31, 2023
EC [Member]          
Loss (gain) contingency, loss (gain) in period   $ 1,180 $ 1,200    
KFTC [Member]          
Loss (gain) contingency, loss (gain) in period       927  
TFTC [Member]          
Loss (gain) contingency, loss (gain) in period $ (676)     $ 778  
NXP [Member]          
NXP termination fee $ 2,000