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Partnerships and Joint Ventures (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Nov. 06, 2025
Oct. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Variable interest entity, not primary beneficiary        
Variable interest entity information        
Net ( liability) assets     $ 4,600 $ 2,400
Variable interest entity, not primary beneficiary | Future funding commitment        
Variable interest entity information        
Commitment amount     $ 48  
NuScale        
Variable interest entity information        
Related party transaction, shares converted (in shares)     15  
Related party transaction, shares sold (in shares)     10  
Related party transaction, proceeds from sale of shares     $ 414  
NuScale | Subsequent Event        
Variable interest entity information        
Related party transaction, shares converted (in shares) 111 5    
Related party transaction, proceeds from sale of shares   $ 191    
Accrued liabilities | Related Party        
Variable interest entity information        
Investments loss position in other accrued liabilities     58 292
Accounts and notes receivable, net | Related Party | Variable interest entity, not primary beneficiary        
Variable interest entity information        
Accounts receivable, net     $ 206 $ 175