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Description of Business (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
segment
Oct. 31, 2024
$ / shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Number of operating segments | segment     3  
Severance costs   $ 7    
NuScale        
Organization Consolidation And Presentation Of Financial Statements [Line Items]        
Recognized pre-tax gain on deconsolidation $ 1,600      
Share price (in dollars per share) | $ / shares       $ 13.15
Number of shares retained after deconsolidation | shares 126,000,000      
Additional recognized pre-tax gain on deconsolidation $ 604