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Acquisitions - Schedule of Total Consideration Exchange (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 27, 2024
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
Business Acquisition [Line Items]        
Per share price of Amentum Holdings, Inc. common stock (usd per share) $ 25.67 $ 25.67    
Equity method investments $ 123 $ 123 $ 104  
Gain on acquisition of controlling interest   69 $ 0 $ 0
Joint Venture Prior To Acquisition        
Business Acquisition [Line Items]        
Equity method investments $ 170 $ 170    
Jacobs Solutions Inc. And Shareholders        
Business Acquisition [Line Items]        
Percentage of issued and outstanding shares of common stock held 58.50%      
CMS        
Business Acquisition [Line Items]        
Shares of Amentum Holdings, Inc. common stock issued to CMS shareholders (in shares) 142      
Fair value of common stock issued to CMS shareholders $ 3,654      
Preliminary fair value of additional equity consideration issued to CMS shareholders 281      
Other consideration 6      
Fair value of consideration transferred 3,941      
Fair value of previously held equity interest 84      
Total consideration $ 4,025      
Noncontrolling interest ownership percentage 50.00% 50.00%    
Gain on acquisition of controlling interest $ 69      
Receivable balance settled in acquisition $ 1      
CMS | Third Party        
Business Acquisition [Line Items]        
Noncontrolling interest ownership percentage 10.00% 10.00%    
CMS | Critical Mission Solutions, Shareholders        
Business Acquisition [Line Items]        
Noncontrolling interest ownership percentage 40.00% 40.00%