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Commitments and Contingencies - Commitments (Details)
$ in Millions
Dec. 31, 2024
CAD ($)
Disclosure of Commitments [Line Items]  
Coal supply agreements $ 75
Long-term service agreements 358
Operating leases 36
Growth 49
Total 1,471
Natural Gas, Transportation and Other Products and Services  
Disclosure of Commitments [Line Items]  
Purchase obligations 763
Transmission  
Disclosure of Commitments [Line Items]  
Purchase obligations 190
2025  
Disclosure of Commitments [Line Items]  
Coal supply agreements 75
Long-term service agreements 61
Operating leases 4
Growth 46
Total 284
2025 | Natural Gas, Transportation and Other Products and Services  
Disclosure of Commitments [Line Items]  
Purchase obligations 75
2025 | Transmission  
Disclosure of Commitments [Line Items]  
Purchase obligations 23
2026  
Disclosure of Commitments [Line Items]  
Coal supply agreements 0
Long-term service agreements 47
Operating leases 3
Growth 3
Total 144
2026 | Natural Gas, Transportation and Other Products and Services  
Disclosure of Commitments [Line Items]  
Purchase obligations 68
2026 | Transmission  
Disclosure of Commitments [Line Items]  
Purchase obligations 23
2027  
Disclosure of Commitments [Line Items]  
Coal supply agreements 0
Long-term service agreements 50
Operating leases 3
Growth 0
Total 139
2027 | Natural Gas, Transportation and Other Products and Services  
Disclosure of Commitments [Line Items]  
Purchase obligations 65
2027 | Transmission  
Disclosure of Commitments [Line Items]  
Purchase obligations 21
2028  
Disclosure of Commitments [Line Items]  
Coal supply agreements 0
Long-term service agreements 31
Operating leases 2
Growth 0
Total 109
2028 | Natural Gas, Transportation and Other Products and Services  
Disclosure of Commitments [Line Items]  
Purchase obligations 66
2028 | Transmission  
Disclosure of Commitments [Line Items]  
Purchase obligations 10
2029  
Disclosure of Commitments [Line Items]  
Coal supply agreements 0
Long-term service agreements 18
Operating leases 2
Growth 0
Total 92
2029 | Natural Gas, Transportation and Other Products and Services  
Disclosure of Commitments [Line Items]  
Purchase obligations 64
2029 | Transmission  
Disclosure of Commitments [Line Items]  
Purchase obligations 8
2030 and thereafter  
Disclosure of Commitments [Line Items]  
Coal supply agreements 0
Long-term service agreements 151
Operating leases 22
Growth 0
Total 703
2030 and thereafter | Natural Gas, Transportation and Other Products and Services  
Disclosure of Commitments [Line Items]  
Purchase obligations 425
2030 and thereafter | Transmission  
Disclosure of Commitments [Line Items]  
Purchase obligations $ 105