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Property, Plant, and Equipment - Reconciliation of the Changes in the Carrying Amount of PP&E (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period $ 5,714 $ 5,556
End of the period 6,020 5,714
Other work performed by entity and capitalised $ 16 $ 57
Weighted average rate 6.52% 6.30%
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period $ 14,444 $ 14,012
Additions 311 875
Acquisitions (Note 4) 412  
Disposals 6 33
Impairment (charges) reversals   14
Retirement of assets 38 264
Change in foreign exchange rates 302 (94)
Transfer to intangible assets (Note 21) (163)  
Transfers to assets 0 2
Transfers to finance lease receivable (48) (65)
End of the period 15,252 14,444
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (8,730) (8,456)
Depreciation 518 585
Disposals (2) (30)
Retirement of assets (33) (235)
Change in foreign exchange rates 162 (47)
Transfer to intangible assets (Note 21) (143)  
Transfers to assets   1
End of the period (9,232) (8,730)
Assets under construction    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 1,234 963
End of the period 120 1,234
Assets under construction | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 1,234 963
Additions 279 869
Acquisitions (Note 4) 11  
Disposals 0 0
Impairment (charges) reversals   0
Retirement of assets 0 0
Change in foreign exchange rates 28 (26)
Transfer to intangible assets (Note 21) 0  
Transfers to assets (1,432) (572)
Transfers to finance lease receivable 0 0
End of the period 120 1,234
Assets under construction | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 0 0
Depreciation 0 0
Disposals 0 0
Retirement of assets 0 0
Change in foreign exchange rates 0 0
Transfer to intangible assets (Note 21) 0  
Transfers to assets   0
End of the period 0 0
Land    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 90 93
End of the period 90 90
Land | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 90 93
Additions 0 0
Acquisitions (Note 4) 0  
Disposals 2 3
Impairment (charges) reversals   0
Retirement of assets 0 0
Change in foreign exchange rates 2 0
Transfer to intangible assets (Note 21) 0  
Transfers to assets 0 0
Transfers to finance lease receivable 0 0
End of the period 90 90
Land | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 0 0
Depreciation 0 0
Disposals 0 0
Retirement of assets 0 0
Change in foreign exchange rates 0 0
Transfer to intangible assets (Note 21) 0  
Transfers to assets   0
End of the period 0 0
Hydro    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 385 362
End of the period 406 385
Hydro | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 884 840
Additions 0 0
Acquisitions (Note 4) 0  
Disposals 0 0
Impairment (charges) reversals   10
Retirement of assets 10 7
Change in foreign exchange rates 0 0
Transfer to intangible assets (Note 21) 0  
Transfers to assets 43 38
Transfers to finance lease receivable 0 0
End of the period 933 884
Hydro | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (499) (478)
Depreciation 37 25
Disposals 0 0
Retirement of assets (9) (4)
Change in foreign exchange rates 0 0
Transfer to intangible assets (Note 21) 0  
Transfers to assets   0
End of the period (527) (499)
Wind and Solar    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 2,256 2,005
End of the period 3,398 2,256
Wind and Solar | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 3,593 3,233
Additions 0 0
Acquisitions (Note 4) 0  
Disposals 0 0
Impairment (charges) reversals   4
Retirement of assets 12 18
Change in foreign exchange rates 124 (18)
Transfer to intangible assets (Note 21) 0  
Transfers to assets 1,205 439
Transfers to finance lease receivable 0 (61)
End of the period 4,919 3,593
Wind and Solar | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (1,337) (1,228)
Depreciation 170 129
Disposals 0 0
Retirement of assets (9) (15)
Change in foreign exchange rates 23 (5)
Transfer to intangible assets (Note 21) 0  
Transfers to assets   0
End of the period (1,521) (1,337)
Gas generation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 1,374 1,718
End of the period 1,669 1,374
Gas generation | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 4,423 4,530
Additions 10 0
Acquisitions (Note 4) 401  
Disposals 1 0
Impairment (charges) reversals   0
Retirement of assets 16 124
Change in foreign exchange rates 0 (7)
Transfer to intangible assets (Note 21) (163)  
Transfers to assets 163 50
Transfers to finance lease receivable (48) (4)
End of the period 4,782 4,423
Gas generation | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (3,049) (2,812)
Depreciation 221 342
Disposals 0 0
Retirement of assets (15) (101)
Change in foreign exchange rates 1 (3)
Transfer to intangible assets (Note 21) (143)  
Transfers to assets   (1)
End of the period (3,113) (3,049)
Energy Transition    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 171 230
End of the period 130 171
Energy Transition | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 3,914 3,974
Additions 0 0
Acquisitions (Note 4) 0  
Disposals 3 30
Impairment (charges) reversals   0
Retirement of assets 0 7
Change in foreign exchange rates 146 (42)
Transfer to intangible assets (Note 21) 0  
Transfers to assets 14 16
Transfers to finance lease receivable 0 0
End of the period 4,071 3,914
Energy Transition | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (3,743) (3,744)
Depreciation 62 73
Disposals (2) (30)
Retirement of assets 0 (7)
Change in foreign exchange rates 138 (39)
Transfer to intangible assets (Note 21) 0  
Transfers to assets   2
End of the period (3,941) (3,743)
Capital spares and other    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 204 185
End of the period 207 204
Capital spares and other | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 306 379
Additions 22 6
Acquisitions (Note 4) 0  
Disposals 0 0
Impairment (charges) reversals   0
Retirement of assets 0 108
Change in foreign exchange rates 2 (1)
Transfer to intangible assets (Note 21) 0  
Transfers to assets 7 31
Transfers to finance lease receivable 0 0
End of the period 337 306
Capital spares and other | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (102) (194)
Depreciation 28 16
Disposals 0 0
Retirement of assets 0 (108)
Change in foreign exchange rates 0 0
Transfer to intangible assets (Note 21) 0  
Transfers to assets   0
End of the period (130) (102)
Decommissioning and restoration | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Changes to decommissioning and restoration costs 38 (3)
Decommissioning and restoration | Assets under construction | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Changes to decommissioning and restoration costs 0 0
Decommissioning and restoration | Land | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Changes to decommissioning and restoration costs 0 0
Decommissioning and restoration | Hydro | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Changes to decommissioning and restoration costs 16 3
Decommissioning and restoration | Wind and Solar | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Changes to decommissioning and restoration costs 9 14
Decommissioning and restoration | Gas generation | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Changes to decommissioning and restoration costs 13 (22)
Decommissioning and restoration | Energy Transition | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Changes to decommissioning and restoration costs 0 3
Decommissioning and restoration | Capital spares and other | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Changes to decommissioning and restoration costs $ 0 $ (1)