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Revenue Disaggregation of Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | $ 2,721 | $ 2,101 | $ 2,347
At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 53 | 58 | 78
Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 629 | 965 | 990
Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 682 | 1,023 | 1,068
Contract With Customers, Power And Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 654 | 1,000 | 1,045
Contract With Customers, Environmental Credits |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 28 | 23 | 23
Lease Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 19 | 123 | 130
Derivatives Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 210 | 407 | 296
Others |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 1,810 | 548 | 853
Hydro | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 383 | 152 | 156
Hydro | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Hydro | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 28 | 141 | 142
Hydro | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 28 | 141 | 142
Hydro | Operating segments | Contract With Customers, Power And Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 28 | 141 | 142
Hydro | Operating segments | Contract With Customers, Environmental Credits |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Hydro | Operating segments | Lease Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Hydro | Operating segments | Derivatives Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Hydro | Operating segments | Others |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 355 | 11 | 14
Wind and Solar | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 305 | 329 | 312
Wind and Solar | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 28 | 25 | 27
Wind and Solar | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 207 | 236 | 217
Wind and Solar | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 235 | 261 | 244
Wind and Solar | Operating segments | Contract With Customers, Power And Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 207 | 238 | 221
Wind and Solar | Operating segments | Contract With Customers, Environmental Credits |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 28 | 23 | 23
Wind and Solar | Operating segments | Lease Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Wind and Solar | Operating segments | Derivatives Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | (25) | (2) | 18
Wind and Solar | Operating segments | Others |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 95 | 70 | 50
Gas | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 1,109 | 787 | 851
Gas | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 2 | 7 | 5
Gas | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 393 | 458 | 492
Gas | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 395 | 465 | 497
Gas | Operating segments | Contract With Customers, Power And Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 395 | 465 | 497
Gas | Operating segments | Contract With Customers, Environmental Credits |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Gas | Operating segments | Lease Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 19 | 123 | 130
Gas | Operating segments | Derivatives Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | (118) | (8) | (15)
Gas | Operating segments | Others |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 813 | 207 | 239
Energy Transition | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 709 | 704 | 905
Energy Transition | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 23 | 26 | 46
Energy Transition | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 1 | 130 | 139
Energy Transition | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 24 | 156 | 185
Energy Transition | Operating segments | Contract With Customers, Power And Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 24 | 156 | 185
Energy Transition | Operating segments | Contract With Customers, Environmental Credits |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Energy Transition | Operating segments | Lease Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Energy Transition | Operating segments | Derivatives Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 138 | 283 | 160
Energy Transition | Operating segments | Others |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 547 | 265 | 560
Energy Marketing | Operating segments |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 211 | 122 | 129
Energy Marketing | Operating segments | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Energy Marketing | Operating segments | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Energy Marketing | Operating segments | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Energy Marketing | Operating segments | Contract With Customers, Power And Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Energy Marketing | Operating segments | Contract With Customers, Environmental Credits |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Energy Marketing | Operating segments | Lease Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Energy Marketing | Operating segments | Derivatives Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 211 | 122 | 129
Energy Marketing | Operating segments | Others |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Corporate and Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 4 | 7 | (6)
Corporate and Other | At a point in time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Corporate and Other | Over time |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Corporate and Other | Contract With Customers |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Corporate and Other | Contract With Customers, Power And Other |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Corporate and Other | Contract With Customers, Environmental Credits |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Corporate and Other | Lease Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 0 | 0 | 0
Corporate and Other | Derivatives Income |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | 4 | 12 | 4
Corporate and Other | Others |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues | $ 0 | $ (5) | $ (10)

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