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Revenue - Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | $ 2,976 | $ 2,721 | $ 2,101
At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 63 | 53 | 58
Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 713 | 629 | 965
Revenues from contracts with customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 776 | 682 | 1,023
Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 725 | 654 | 1,000
Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 51 | 28 | 23
Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 32 | 19 | 123
Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | (507) | 221 | 417
Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 2,640 | 1,767 | 516
Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 35 | 32 | 22
Hydro | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 606 | 383 | 152
Hydro | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 1 | 0 | 0
Hydro | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 33 | 28 | 141
Hydro | Operating segments | Revenues from contracts with customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 34 | 28 | 141
Hydro | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 33 | 28 | 141
Hydro | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 1 | 0 | 0
Hydro | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Hydro | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Hydro | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 564 | 345 | 3
Hydro | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 8 | 10 | 8
Wind and Solar | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 289 | 305 | 329
Wind and Solar | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 50 | 28 | 25
Wind and Solar | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 220 | 207 | 236
Wind and Solar | Operating segments | Revenues from contracts with customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 270 | 235 | 261
Wind and Solar | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 220 | 207 | 238
Wind and Solar | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 50 | 28 | 23
Wind and Solar | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Wind and Solar | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | (87) | (14) | 8
Wind and Solar | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 86 | 68 | 49
Wind and Solar | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 20 | 16 | 11
Gas | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 1,209 | 1,109 | 787
Gas | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 2 | 7
Gas | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 462 | 393 | 458
Gas | Operating segments | Revenues from contracts with customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 462 | 395 | 465
Gas | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 462 | 395 | 465
Gas | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Gas | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 32 | 19 | 123
Gas | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | (821) | (118) | (8)
Gas | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 1,529 | 808 | 200
Gas | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 7 | 5 | 7
Energy Transition | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 714 | 709 | 704
Energy Transition | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 12 | 23 | 26
Energy Transition | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | (2) | 1 | 130
Energy Transition | Operating segments | Revenues from contracts with customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 10 | 24 | 156
Energy Transition | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 10 | 24 | 156
Energy Transition | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Transition | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Transition | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 243 | 138 | 283
Energy Transition | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 461 | 546 | 264
Energy Transition | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 1 | 1
Energy Marketing | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 160 | 211 | 122
Energy Marketing | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Revenues from contracts with customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 160 | 211 | 122
Energy Marketing | Operating segments | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Energy Marketing | Operating segments | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | (2) | 4 | 7
Corporate | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Revenues from contracts with customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Power and other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Environmental attributes |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Revenue from leases |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Revenue from derivatives and other trading activities |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | (2) | 4 | 12
Corporate | Revenue from merchant sales |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Corporate | Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Total revenue from contracts with customers | $ 0 | $ 0 | $ (5)

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