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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, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period $ 5,556 $ 5,320
Disposals   5
End of the period 5,714 5,556
Other work performed by entity and capitalised $ 57 $ 16
Weighted average rate 6.30% 6.00%
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period $ 14,012 $ 13,389
Additions 875 897
Additions from development projects   29
Disposals 33 220
Impairment (charges) reversals (14) 62
Retirement of assets 264 39
Change in foreign exchange rates (94) 153
Transfers to assets 2 (61)
Transfers to finance lease receivable (65)  
End of the period 14,444 14,012
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (8,456) (8,069)
Depreciation 585 538
Disposals (30) (212)
Retirement of assets (235) (33)
Change in foreign exchange rates (47) 102
Transfers to assets   (8)
Transfers in (out) of PP&E 1  
End of the period (8,730) (8,456)
Assets under construction    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 963 184
End of the period 1,234 963
Assets under construction | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 963 184
Additions 869 891
Additions from development projects   17
Disposals 0 0
Impairment (charges) reversals 0 (2)
Retirement of assets 0 0
Change in foreign exchange rates (26) 13
Transfers to assets (572) (144)
Transfers to finance lease receivable 0  
End of the period 1,234 963
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
Transfers to assets   0
Transfers in (out) of PP&E 0  
End of the period 0 0
Land    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 93 96
End of the period 90 93
Land | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 93 96
Additions 0 0
Additions from development projects   0
Disposals 3 3
Impairment (charges) reversals 0 0
Retirement of assets 0 0
Change in foreign exchange rates 0 0
Transfers to assets 0 0
Transfers to finance lease receivable 0  
End of the period 90 93
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
Transfers to assets   0
Transfers in (out) of PP&E 0  
End of the period 0 0
Hydro    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 362 399
End of the period 385 362
Hydro | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 840 867
Additions 0 0
Additions from development projects   0
Disposals 0 0
Impairment (charges) reversals (10) 21
Retirement of assets 7 9
Change in foreign exchange rates 0 0
Transfers to assets 38 18
Transfers to finance lease receivable 0  
End of the period 884 840
Hydro | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (478) (468)
Depreciation 25 21
Disposals 0 0
Retirement of assets (4) (8)
Change in foreign exchange rates 0 0
Transfers to assets   (3)
Transfers in (out) of PP&E 0  
End of the period (499) (478)
Wind and Solar    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 2,005 2,183
End of the period 2,256 2,005
Wind and Solar | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 3,233 3,276
Additions 0 0
Additions from development projects   0
Disposals 0 0
Impairment (charges) reversals (4) 43
Retirement of assets 18 9
Change in foreign exchange rates (18) 45
Transfers to assets 439 23
Transfers to finance lease receivable (61)  
End of the period 3,593 3,233
Wind and Solar | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (1,228) (1,093)
Depreciation 129 130
Disposals 0 0
Retirement of assets (15) (6)
Change in foreign exchange rates (5) 11
Transfers to assets   0
Transfers in (out) of PP&E 0  
End of the period (1,337) (1,228)
Gas generation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 1,718 1,909
End of the period 1,374 1,718
Gas generation | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 4,530 4,087
Additions 0 0
Additions from development projects   0
Disposals 0 1
Impairment (charges) reversals 0 0
Retirement of assets 124 12
Change in foreign exchange rates (7) (4)
Transfers to assets 50 472
Transfers to finance lease receivable (4)  
End of the period 4,423 4,530
Gas generation | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (2,812) (2,178)
Depreciation 342 308
Disposals 0 (1)
Retirement of assets (101) (10)
Change in foreign exchange rates (3) 2
Transfers to assets   335
Transfers in (out) of PP&E (1)  
End of the period (3,049) (2,812)
Energy Transition    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 230 363
End of the period 171 230
Energy Transition | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 3,974 4,513
Additions 0 0
Additions from development projects   0
Disposals 30 216
Impairment (charges) reversals 0 0
Retirement of assets 7 7
Change in foreign exchange rates (42) 97
Transfers to assets 16 (423)
Transfers to finance lease receivable 0  
End of the period 3,914 3,974
Energy Transition | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (3,744) (4,150)
Depreciation 73 63
Disposals (30) (211)
Retirement of assets (7) (7)
Change in foreign exchange rates (39) 89
Transfers to assets   (340)
Transfers in (out) of PP&E 2  
End of the period (3,743) (3,744)
Capital spares and other    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 185 186
End of the period 204 185
Capital spares and other | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period 379 366
Additions 6 6
Additions from development projects   12
Disposals 0 0
Impairment (charges) reversals 0 0
Retirement of assets 108 2
Change in foreign exchange rates (1) 2
Transfers to assets 31 (7)
Transfers to finance lease receivable 0  
End of the period 306 379
Capital spares and other | Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the period (194) (180)
Depreciation 16 16
Disposals 0 0
Retirement of assets (108) (2)
Change in foreign exchange rates 0 0
Transfers to assets   0
Transfers in (out) of PP&E 0  
End of the period (102) (194)
Decommissioning and restoration    
Disclosure of detailed information about property, plant and equipment [line items]    
Disposals   5
Decommissioning and restoration | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Revisions/additions to decommissioning and restoration costs (3) (74)
Decommissioning and restoration | Assets under construction | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Revisions/additions to decommissioning and restoration costs 0 0
Decommissioning and restoration | Land | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Revisions/additions to decommissioning and restoration costs 0 0
Decommissioning and restoration | Hydro | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Revisions/additions to decommissioning and restoration costs 3 (15)
Decommissioning and restoration | Wind and Solar | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Revisions/additions to decommissioning and restoration costs 14 (59)
Decommissioning and restoration | Gas generation | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Revisions/additions to decommissioning and restoration costs (22) (12)
Decommissioning and restoration | Energy Transition | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Revisions/additions to decommissioning and restoration costs 3 10
Decommissioning and restoration | Capital spares and other | Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Revisions/additions to decommissioning and restoration costs $ (1) $ 2