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Financial Instruments - Marketable Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 29, 2018
Sep. 30, 2017
Fair Value of Marketable Securities    
Continuous Unrealized Losses, Less than 12 Months $ 126,238 $ 101,986
Continuous Unrealized Losses, 12 Months or Greater 60,599 8,290
Continuous Unrealized Losses, Total 186,837 110,276
Unrealized Losses    
Continuous Unrealized Losses, Less than 12 Months (2,400) (596)
Continuous Unrealized Losses, 12 Months or Greater (1,889) (186)
Continuous Unrealized Losses, Total $ (4,289) $ (782)