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Risk Management - Summary of Sensitivity Analysis for Provisions Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
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)