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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)