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Financial Instruments - Marketable Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 28, 2019
Sep. 29, 2018
Fair Value of Marketable Debt Securities    
Continuous Unrealized Losses, Less than 12 Months $ 28,151 $ 126,238
Continuous Unrealized Losses, 12 Months or Greater 28,167 60,599
Continuous Unrealized Losses, Total 56,318 186,837
Unrealized Losses    
Continuous Unrealized Losses, Less than 12 Months (138) (2,400)
Continuous Unrealized Losses, 12 Months or Greater (143) (1,889)
Continuous Unrealized Losses, Total $ (281) $ (4,289)