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Risk Management - Summary of Sensitivity Analysis for Provisions Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
PCBs | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase $ (123) $ (169)
0.1% Decrease 123 169
PCBs | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 123 169
0.1% Decrease (123) (169)
Nuclear plants | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (418,570) (474,432)
0.1% Decrease 432,847 491,360
Nuclear plants | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 458,047 515,262
0.1% Decrease (443,531) (498,258)
Spent fuel | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (130,065) (54,330)
0.1% Decrease 130,761 56,453
Spent fuel | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 133,931 57,269
0.1% Decrease (128,607) (55,191)
Radioactive waste | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (13,538) (15,089)
0.1% Decrease 13,683 15,260
Radioactive waste | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 13,291 14,190
0.1% Decrease $ (13,174) $ (14,056)