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Risk Management - Summary of Sensitivity Analysis for Provisions Assumptions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
PCBs | Discount rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | $ (58) | $ (123)
0.1% Decrease | 58 | 123
PCBs | Inflation rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | 58 | 123
0.1% Decrease | (58) | (123)
Nuclear plants | Discount rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | (464,727) | (418,570)
0.1% Decrease | 481,899 | 432,847
Nuclear plants | Inflation rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | 507,814 | 458,047
0.1% Decrease | (490,386) | (443,531)
Spent fuel | Discount rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | (129,983) | (130,065)
0.1% Decrease | 130,679 | 130,761
Spent fuel | Inflation rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | 133,847 | 133,931
0.1% Decrease | (128,527) | (128,607)
Radioactive waste | Discount rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | (11,363) | (13,538)
0.1% Decrease | 11,478 | 13,683
Radioactive waste | Inflation rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | 11,167 | 13,291
0.1% Decrease | $ (11,075) | $ (13,174)

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