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Revenue Contract Balances (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Contract assets $ 12 $ 2 $ 2 $ 3
Contract assets, additions/(deletions) 10 0    
Contract with Customer, Asset, Reclassified to Receivable [1] 0 (1)    
Long-term contract assets 4 0 0 1
Contract with Customer, Asset Increase (Decrease), Noncurrent 4 (1)    
Contract With Customer Non Current Asset Reclassified To Receivable [1] 0 0    
Liability, change in timeframe, performance obligation satisfied, revenue recognized 0 0    
Nonrelated Party [Member]        
Deferred revenue 47 82 84 59
Deferred revenue, revenue recognized [1] (59) (42)    
Deferred Revenue, Additions 22 65    
Long-term deferred revenue, additions/(deletions) (15) (22)    
Long-term deferred revenue, revenue recognized [1] 0 0    
Deferred Revenue from Contracts with Customers, Noncurrent 300 322 315 344
Related Party [Member]        
Deferred revenue 118   106  
Deferred revenue, revenue recognized [1] (62) (50)    
Deferred Revenue, Additions 66 56    
Deferred Revenue from Contracts with Customers, Current 75 53 71 47
Long-term deferred revenue, additions/(deletions) 1 5    
Long-term deferred revenue, revenue recognized [1] 0 0    
Deferred Revenue from Contracts with Customers, Noncurrent $ 45 $ 34 $ 44 $ 29
[1] No significant revenue was recognized related to past performance obligations in the current periods.