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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Dec. 29, 2018
Sep. 30, 2018
Sep. 29, 2018
Sep. 30, 2017
Significant Accounting Policies [Line Items]        
Reduction to other non-current assets upon adoption of ASU 2016-16 $ (34,686)   $ (22,283)  
Potentially dilutive securities excluded from the computation of diluted earnings per share because their effect would have been antidilutive (in shares) 28.8      
Accounting Standards Update 2016-16        
Significant Accounting Policies [Line Items]        
Increase to net deferred tax assets upon adoption of ASU 2016-16   $ 2,700    
Reduction to other non-current assets upon adoption of ASU 2016-16   128    
Retained earnings        
Significant Accounting Policies [Line Items]        
Increase to retained earnings upon adoption of ASU 2016-16     $ 2,501 $ 0
Retained earnings | Accounting Standards Update 2016-16        
Significant Accounting Policies [Line Items]        
Increase to retained earnings upon adoption of ASU 2016-16   $ 2,600