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Provision for de-characterization of dam structures and asset retirement obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Provision For De-characterization Of Dam Structures And Asset Retirement Obligations      
De-characterization of upstream geotechnical structures $ 206 $ (153) $ (72)
Asset retirement obligations 16 (5) (23)
Environmental obligations (50) (71) (33)
 Total provision for income statement $ 172 $ (229) $ (128)