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Financial Instruments (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2021 CAD ($) MW | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Risk management assets |  | $ 171 | $ 308 |  |
Financial liabilities |  | $ 3,361 | $ 3,267 |  |
White Rock East And White Rock West Wind Power Projects |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Capacity of facility (in megawatts) | MW |  |  | 300 |  |
Long-term wind energy sale – Canada |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 49.00% |  |
Long-term wind energy sale – Canada | Pembina |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 37.70% |  |
Long-term wind energy sale - Central US |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 100.00% |  |
Fixed-price contracts | Minimum |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Long-term fixed price power sale contract, delivery volume | MW |  |  | 300 |  |
Fixed-price contracts | Maximum |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Long-term fixed price power sale contract, delivery volume | MW |  |  | 380 |  |
Coal transportation – US | Minimum |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Sensitivity analysis in derivative, basis relationship, percent |  | 80.00% |  |  |
Sensitivity analysis in derivative, non-standard shape factors, percent |  | 0.00% |  |  |
Coal transportation – US | Maximum |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Sensitivity analysis in derivative, basis relationship, percent |  | 120.00% |  |  |
Sensitivity analysis in derivative, non-standard shape factors, percent |  | 4.00% |  |  |
Level III | Long-term contracts | Fixed-price contracts |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Forward power price ranges per MWh |  |  |  | $ 1 |
Level III | Long-term contracts | Fixed-price contracts | Minimum |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase (decrease) in derivative forward power prices, reasonable possible | $ 3 |  |  |  |
Level III | Long-term contracts | Fixed-price contracts | Maximum |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase (decrease) in derivative forward power prices, reasonable possible | (2) |  |  |  |
Level III | Long-term contracts | Forward contract |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Forward power price ranges per MWh |  |  |  | $ 6 |
Increase (decrease) in derivative forward power prices, reasonable possible | $ (6) |  |  |  |
Recurring fair value measurement | Level I |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic |  | $ (13) | $ 12 |  |
Recurring fair value measurement | Level III |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Risk exposure associated with instruments sharing characteristic |  | 582 | 159 |  | $ 686
Recurring fair value measurement | Level III | Financial liabilities at fair value through profit or loss, category [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Financial liabilities |  | 33 | 146 |  |
Recurring fair value measurement | Level III | Financial assets at fair value through profit or loss, category [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Financial assets |  | $ 615 | $ 305 |  |

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