Provision for de-characterization of dam structures and asset retirement obligations (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Provision For De-characterization Of Dam Structures And Asset Retirement Obligations | ||||
| De-characterization of upstream geotechnical structures | $ (53) | $ (56) | $ (56) | $ (65) |
| Obligation for asset decommissioning | (14) | 4 | (9) | 12 |
| Total | $ (67) | $ (52) | $ (65) | $ (53) |