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Segments Disclosures - Reported Segment Earnings (Loss) and Segment Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Revenue $ 2,845 $ 3,355 $ 2,976
Fuel and purchased power 939 1,060 1,263
Carbon compliance 112 112 78
Gross margin 1,794 2,183 1,635
OM&A 655   521
Taxes, other than income taxes 36 29 33
Net other operating loss (income) (59) (47) (58)
Equity income 5 4 9
Finance lease income 14 12 19
Depreciation and amortization (Note 19, 20, 21 and 27) (531) (621) (599)
Asset impairment charges (46) 48 (9)
Interest income 30 59 24
Interest expense 324 281 286
Foreign exchange gain (loss) 5 (7) 4
Gain on sale of assets and other 4 4 52
Earnings before income taxes 319 880 353
Previously Reported      
Disclosure of operating segments [line items]      
Revenue 2,845 3,355 2,976
Fuel and purchased power 939 1,060 1,263
OM&A 655 539 521
Net other operating loss (income) (59) (47) (58)
Operating segments      
Disclosure of operating segments [line items]      
Revenue 2,875 3,326 3,495
Fuel and purchased power 934 1,056 1,259
Carbon compliance 112 112 78
Gross margin 1,829 2,158 2,158
OM&A 590   521
Taxes, other than income taxes 36 30 35
Net other operating loss (income) (50) (46) (54)
Adjusted EBITDA 1,253 1,632 1,656
Operating segments | Previously Reported      
Disclosure of operating segments [line items]      
Revenue 2,866 3,376 2,990
Fuel and purchased power 939 1,060 1,263
OM&A 659 542 523
Net other operating loss (income) (59) (47) (61)
Operating segments | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue 3 (37) 378
Operating segments | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue (6) (81) 43
Operating segments | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue 21 55 46
Operating segments | Finance lease income      
Disclosure of operating segments [line items]      
Revenue 14 12 19
Operating segments | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue (1)    
Operating segments | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue (20)   20
OM&A (31)   (2)
Operating segments | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue (2) 1 (1)
Operating segments | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power (1)    
Operating segments | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power (4) (4) (4)
Operating segments | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A (14)    
Operating segments | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A (24)    
Operating segments | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) 9    
Operating segments | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   1  
Operating segments | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     7
Material reconciling items      
Disclosure of operating segments [line items]      
Revenue (9) 50 (505)
Fuel and purchased power 5 4 4
Carbon compliance 0 0 0
Gross margin (14) 46 (509)
OM&A 69   2
Taxes, other than income taxes 0 0 0
Net other operating loss (income) (9) (1) (7)
Material reconciling items | Previously Reported      
Disclosure of operating segments [line items]      
Revenue 0 0
Fuel and purchased power 0 0 0
OM&A 0 0 0
Net other operating loss (income) 0 0 0
Material reconciling items | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue (3) 37 (378)
Material reconciling items | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue 6 81 (43)
Material reconciling items | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue (21) (55) (46)
Material reconciling items | Finance lease income      
Disclosure of operating segments [line items]      
Revenue (14) (12) (19)
Material reconciling items | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue 1    
Material reconciling items | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue 20   (20)
OM&A 31   2
Material reconciling items | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue 2 (1) 1
Material reconciling items | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power 1    
Material reconciling items | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power 4 4 4
Material reconciling items | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A 14    
Material reconciling items | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A 24    
Material reconciling items | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) (9)    
Material reconciling items | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   (1)  
Material reconciling items | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     (7)
Material reconciling items | Equity- accounted investments      
Disclosure of operating segments [line items]      
Revenue (21) (21) (14)
Fuel and purchased power 0 0 0
Carbon compliance 0 0 0
Gross margin (21) (21) (14)
OM&A (4)   (2)
Taxes, other than income taxes 0 (1) (2)
Net other operating loss (income) 0 0 3
Material reconciling items | Equity- accounted investments | Previously Reported      
Disclosure of operating segments [line items]      
Revenue (21) (21) (14)
Fuel and purchased power 0 0 0
OM&A (4) (3) (2)
Net other operating loss (income) 0 3
Material reconciling items | Equity- accounted investments | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Material reconciling items | Equity- accounted investments | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Material reconciling items | Equity- accounted investments | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Material reconciling items | Equity- accounted investments | Finance lease income      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Material reconciling items | Equity- accounted investments | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue 0    
Material reconciling items | Equity- accounted investments | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue 0   0
OM&A 0   0
Material reconciling items | Equity- accounted investments | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Material reconciling items | Equity- accounted investments | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power 0    
Material reconciling items | Equity- accounted investments | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power 0 0 0
Material reconciling items | Equity- accounted investments | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A 0    
Material reconciling items | Equity- accounted investments | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A    
Material reconciling items | Equity- accounted investments | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) 0    
Material reconciling items | Equity- accounted investments | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   0  
Material reconciling items | Equity- accounted investments | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     0
Hydro | Operating segments      
Disclosure of operating segments [line items]      
Revenue 390 529 627
Fuel and purchased power 16 19 22
Carbon compliance 0 0 0
Gross margin 374 510 605
OM&A 55   53
Taxes, other than income taxes 3 3 3
Net other operating loss (income) 0 0 0
Adjusted EBITDA 316 459 549
Hydro | Operating segments | Previously Reported      
Disclosure of operating segments [line items]      
Revenue 409 533 606
Fuel and purchased power 16 19 22
OM&A 86 48 55
Net other operating loss (income) 0 0 0
Hydro | Operating segments | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue 1 (4) 1
Hydro | Operating segments | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Hydro | Operating segments | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Hydro | Operating segments | Finance lease income      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Hydro | Operating segments | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue 0    
Hydro | Operating segments | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue (20)   20
OM&A (31)   (2)
Hydro | Operating segments | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Hydro | Operating segments | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power 0    
Hydro | Operating segments | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power 0 0 0
Hydro | Operating segments | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A 0    
Hydro | Operating segments | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A 0    
Hydro | Operating segments | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) 0    
Hydro | Operating segments | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   0  
Hydro | Operating segments | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     0
Wind and Solar | Operating segments      
Disclosure of operating segments [line items]      
Revenue 449 373 407
Fuel and purchased power 30 30 31
Carbon compliance 0 0 1
Gross margin 419 343 375
OM&A 97   68
Taxes, other than income taxes 16 12 12
Net other operating loss (income) (10) (6) (16)
Adjusted EBITDA 316 257 311
Wind and Solar | Operating segments | Previously Reported      
Disclosure of operating segments [line items]      
Revenue 357 357 303
Fuel and purchased power 30 30 31
OM&A 97 80 68
Net other operating loss (income) (10) (7) (23)
Wind and Solar | Operating segments | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue 84 16 104
Wind and Solar | Operating segments | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Wind and Solar | Operating segments | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue 2 0 0
Wind and Solar | Operating segments | Finance lease income      
Disclosure of operating segments [line items]      
Revenue 6 0 0
Wind and Solar | Operating segments | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue 0    
Wind and Solar | Operating segments | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue 0   0
OM&A 0   0
Wind and Solar | Operating segments | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Wind and Solar | Operating segments | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power 0    
Wind and Solar | Operating segments | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power 0 0 0
Wind and Solar | Operating segments | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A 0    
Wind and Solar | Operating segments | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A 0    
Wind and Solar | Operating segments | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) 0    
Wind and Solar | Operating segments | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   1  
Wind and Solar | Operating segments | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     7
Gas | Operating segments      
Disclosure of operating segments [line items]      
Revenue 1,321 1,525 1,521
Fuel and purchased power 470 449 637
Carbon compliance 145 112 83
Gross margin 706 964 801
OM&A 198   195
Taxes, other than income taxes 13 11 15
Net other operating loss (income) (40) (40) (38)
Adjusted EBITDA 535 801 629
Gas | Operating segments | Previously Reported      
Disclosure of operating segments [line items]      
Revenue 1,350 1,514 1,209
Fuel and purchased power 475 453 641
OM&A 198 192 195
Net other operating loss (income) (40) (40) (38)
Gas | Operating segments | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue (60) (67) 251
Gas | Operating segments | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue 7 10 (4)
Gas | Operating segments | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue 19 55 46
Gas | Operating segments | Finance lease income      
Disclosure of operating segments [line items]      
Revenue 8 12 19
Gas | Operating segments | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue (1)    
Gas | Operating segments | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue 0   0
OM&A 0   0
Gas | Operating segments | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue (2) 1 0
Gas | Operating segments | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power (1)    
Gas | Operating segments | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power (4) (4) (4)
Gas | Operating segments | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A 0    
Gas | Operating segments | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A 0    
Gas | Operating segments | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) 0    
Gas | Operating segments | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   0  
Gas | Operating segments | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     0
Energy Transition | Operating segments      
Disclosure of operating segments [line items]      
Revenue 582 746 724
Fuel and purchased power 418 557 566
Carbon compliance 1 0 (1)
Gross margin 163 189 159
OM&A 69   69
Taxes, other than income taxes 3 3 4
Net other operating loss (income) 0 0 0
Adjusted EBITDA 91 122 86
Energy Transition | Operating segments | Previously Reported      
Disclosure of operating segments [line items]      
Revenue 616 751 714
Fuel and purchased power 418 557 566
OM&A 69 64 69
Net other operating loss (income) (9) 0 0
Energy Transition | Operating segments | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue (36) (5) 10
Energy Transition | Operating segments | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue 2 0 0
Energy Transition | Operating segments | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Energy Transition | Operating segments | Finance lease income      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Energy Transition | Operating segments | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue 0    
Energy Transition | Operating segments | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue 0   0
OM&A 0   0
Energy Transition | Operating segments | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Energy Transition | Operating segments | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power 0    
Energy Transition | Operating segments | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power 0 0 0
Energy Transition | Operating segments | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A 0    
Energy Transition | Operating segments | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A 0    
Energy Transition | Operating segments | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) 9    
Energy Transition | Operating segments | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   0  
Energy Transition | Operating segments | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     0
Energy Marketing | Operating segments      
Disclosure of operating segments [line items]      
Revenue 167 152 218
Fuel and purchased power 0 0 0
Carbon compliance 0 0 0
Gross margin 167 152 218
OM&A 36   35
Taxes, other than income taxes 0 0 0
Net other operating loss (income) 0 0 0
Adjusted EBITDA 131 109 183
Energy Marketing | Operating segments | Previously Reported      
Disclosure of operating segments [line items]      
Revenue 168 220 160
Fuel and purchased power 0 0 0
OM&A 36 43 35
Net other operating loss (income) 0 0 0
Energy Marketing | Operating segments | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue 14 23 12
Energy Marketing | Operating segments | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue (15) (91) 47
Energy Marketing | Operating segments | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Energy Marketing | Operating segments | Finance lease income      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Energy Marketing | Operating segments | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue 0    
Energy Marketing | Operating segments | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue 0   0
OM&A 0   0
Energy Marketing | Operating segments | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue 0 0 (1)
Energy Marketing | Operating segments | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power 0    
Energy Marketing | Operating segments | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power 0 0 0
Energy Marketing | Operating segments | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A 0    
Energy Marketing | Operating segments | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A 0    
Energy Marketing | Operating segments | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) 0    
Energy Marketing | Operating segments | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   0  
Energy Marketing | Operating segments | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     0
Corporate | Operating segments      
Disclosure of operating segments [line items]      
Revenue (34) 1 (2)
Fuel and purchased power 0 1 3
Carbon compliance (34) 0 (5)
Gross margin 0 0 0
OM&A 135   101
Taxes, other than income taxes 1 1 1
Net other operating loss (income) 0 0 0
Adjusted EBITDA (136) (116) (102)
Corporate | Operating segments | Previously Reported      
Disclosure of operating segments [line items]      
Revenue (34) 1 (2)
Fuel and purchased power 0 1 3
OM&A 173 115 101
Net other operating loss (income) 0 0 0
Corporate | Operating segments | Unrealized mark-to-market (gain) loss      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Corporate | Operating segments | Realized gain (loss) on closed exchange positions      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Corporate | Operating segments | Decrease in finance lease receivable      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Corporate | Operating segments | Finance lease income      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Corporate | Operating segments | Revenues from Planned Divestitures      
Disclosure of operating segments [line items]      
Revenue 0    
Corporate | Operating segments | Brazeau penalties      
Disclosure of operating segments [line items]      
Revenue 0   0
OM&A 0   0
Corporate | Operating segments | Unrealized foreign exchange gain on commodity      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Corporate | Operating segments | Fuel and purchased power related to Planned Divestitures      
Disclosure of operating segments [line items]      
Fuel and purchased power 0    
Corporate | Operating segments | Australian interest income      
Disclosure of operating segments [line items]      
Fuel and purchased power 0 0 0
Corporate | Operating segments | ERP integration costs      
Disclosure of operating segments [line items]      
OM&A (14)    
Corporate | Operating segments | Acquisition-related transaction and restructuring costs      
Disclosure of operating segments [line items]      
OM&A (24)    
Corporate | Operating segments | Sundance A decommissioning cost reimbursement      
Disclosure of operating segments [line items]      
Net other operating loss (income) $ 0    
Corporate | Operating segments | Insurance recovery      
Disclosure of operating segments [line items]      
Net other operating loss (income)   $ 0  
Corporate | Operating segments | Royalty onerous contract and contract termination penalties      
Disclosure of operating segments [line items]      
Net other operating loss (income)     $ 0