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Revenue Disaggregation of Revenue (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues $ 2,101 $ 2,347 $ 2,249
At a point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 58 78 65
Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 965 990 1,096
Contract With Customers      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 1,023 1,068 1,161
Lease Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 123 130 170
Derivatives Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 407 296 165
Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 5 8 16
Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 543 845 737
Hydro | Operating segments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 152 156 156
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 141 142 132
Hydro | Operating segments | Contract With Customers      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 141 142 132
Hydro | Operating segments | Lease Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 7
Hydro | Operating segments | Derivatives Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Hydro | Operating segments | Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 1 0 0
Hydro | Operating segments | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 10 14 17
Wind and Solar | Operating segments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 329 312 282
Wind and Solar | Operating segments | At a point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 25 27 18
Wind and Solar | Operating segments | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 236 217 188
Wind and Solar | Operating segments | Contract With Customers      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 261 244 206
Wind and Solar | Operating segments | Lease Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 27
Wind and Solar | Operating segments | Derivatives Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues (2) 18 (20)
Wind and Solar | Operating segments | Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 4 8 16
Wind and Solar | Operating segments | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 66 42 53
North American Gas | Operating segments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 217 209 232
North American Gas | Operating segments | At a point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
North American Gas | Operating segments | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 196 190 206
North American Gas | Operating segments | Contract With Customers      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 196 190 206
North American Gas | Operating segments | Lease Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 8 0 0
North American Gas | Operating segments | Derivatives Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 4 2 4
North American Gas | Operating segments | Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
North American Gas | Operating segments | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 9 17 22
Australian Gas | Operating segments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 158 160 165
Australian Gas | Operating segments | At a point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Australian Gas | Operating segments | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 90 87 91
Australian Gas | Operating segments | Contract With Customers      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 90 87 91
Australian Gas | Operating segments | Lease Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 60 65 68
Australian Gas | Operating segments | Derivatives Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Australian Gas | Operating segments | Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Australian Gas | Operating segments | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 8 8 6
Alberta Thermal | Operating segments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 619 816 912
Alberta Thermal | Operating segments | At a point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 23 41 38
Alberta Thermal | Operating segments | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 302 354 479
Alberta Thermal | Operating segments | Contract With Customers      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 325 395 517
Alberta Thermal | Operating segments | Lease Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 55 65 68
Alberta Thermal | Operating segments | Derivatives Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues (12) (17) (1)
Alberta Thermal | Operating segments | Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Alberta Thermal | Operating segments | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 251 373 328
Centralia | Operating segments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 497 571 442
Centralia | Operating segments | At a point in time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 10 10 9
Centralia | Operating segments | Over time      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Centralia | Operating segments | Contract With Customers      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 10 10 9
Centralia | Operating segments | Lease Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Centralia | Operating segments | Derivatives Income      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 283 160 115
Centralia | Operating segments | Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Centralia | Operating segments | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 204 401 318
Energy Marketing | Operating segments      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 122 129 67
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 | 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 122 129 67
Energy Marketing | Operating segments | Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Energy Marketing | Operating segments | Other      
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 7 (6) (7)
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 | 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 12 4 0
Corporate and Other | Government incentives      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0 0 0
Corporate and Other | Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues $ (5) $ (10) $ (7)