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Financial Instruments - Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 27, 2021
Sep. 26, 2020
Mar. 28, 2020
Sep. 28, 2019
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 38,466 $ 38,016    
Restricted cash $ 1,540 $ 1,773    
Restricted cash and cash equivalents, noncurrent, asset, statement of financial position [Extensible List] Other non-current assets Other non-current assets    
Cash, cash equivalents and restricted cash $ 40,006 $ 39,789 $ 43,049 $ 50,224