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Revenues (Pre-operating) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Revenues.          
Recognized pre-operating costs $ 41 $ 44 $ 120 $ 92  
Unrecognized pre-operating costs $ 170   $ 170   $ 224