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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, 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)

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