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Risk Management Activities - Effect of Hedges (Details) MWh in Thousands, $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2022 USD ($) MWh | Dec. 31, 2022 CAD ($) MWh | Dec. 31, 2021 USD ($) MWh | Dec. 31, 2021 CAD ($) MWh
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Fair value asset |  |  |  | $ 3 |  | $ 2
Physical power sales | Cash flow hedges | Commodity risk management |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount (MMWH) | MWh |  |  | 9,295 | 9,295 | 12,624 | 12,624
Fair value asset |  |  |  |  |  | $ 285
Fair value liability |  |  |  | $ (347) |  |
Change in fair value used for measuring ineffectiveness | $ (594) | $ (181) |  |  |  |
Interest rate swap | Cash flow hedges | Interest rate risk | USD |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 300 |
Fair value asset |  |  |  |  |  | 3
Change in fair value used for measuring ineffectiveness |  | 3 |  |  |  |
Foreign-Denominated Expenditures | Cash flow hedges | Interest rate risk | USD | Minimum |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount |  |  |  |  | 8 |
Fair value asset |  |  |  |  |  | 0
Change in fair value used for measuring ineffectiveness |  | 0 |  |  |  |
Foreign-Denominated Expenditures | Cash flow hedges | Interest rate risk | USD | Maximum |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount |  |  |  |  | 14 |
Fair value asset |  |  |  |  |  | 0
Change in fair value used for measuring ineffectiveness |  | 0 |  |  |  |
Foreign-denominated debt | Net Investment Hedge | Currency risk |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Fair value asset |  |  |  | $ 502 |  | $ 473
Change in fair value used for measuring ineffectiveness | $ 0 | $ 0 |  |  |  |
Foreign-denominated debt | Net Investment Hedge | Currency risk | USD |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |
Notional amount |  |  | $ 370 |  | $ 370 |

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