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Revenues (Contract liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Contract balances        
Deferred contract revenues, recorded in other current liabilities $ 197 $ 231    
Deferred contract revenues, recorded in other long-term liabilities 110 212    
Total contract liabilities $ 307 $ 443 $ 496 $ 398