v3.25.4
SEGMENTED REPORTING - Summary of Segment Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Revenues $ 9,041 $ 8,484
Purchased power 4,486 4,143
Operation, maintenance and administration 1,206 1,308
Depreciation, amortization and asset removal costs 1,111 1,066
Income before financing charges, equity income and income tax expense 2,238 1,967
Capital investments 3,366 3,063
Total assets 39,671 36,682
Total goodwill 378 373
Transmission    
Segment Reporting Information [Line Items]    
Total assets 23,630 21,630
Total goodwill 157 157
Transmission | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 2,429 2,269
Purchased power 0 0
Operation, maintenance and administration 447 475
Depreciation, amortization and asset removal costs 570 554
Income before financing charges, equity income and income tax expense 1,412 1,240
Capital investments 2,097 1,860
Distribution    
Segment Reporting Information [Line Items]    
Total assets 15,160 14,040
Total goodwill 216 216
Distribution | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 6,557 6,175
Purchased power 4,486 4,143
Operation, maintenance and administration 661 721
Depreciation, amortization and asset removal costs 529 502
Income before financing charges, equity income and income tax expense 881 809
Capital investments 1,252 1,185
Other    
Segment Reporting Information [Line Items]    
Total assets 881 1,012
Total goodwill 5 0
Other | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 55 40
Purchased power 0 0
Operation, maintenance and administration 98 112
Depreciation, amortization and asset removal costs 12 10
Income before financing charges, equity income and income tax expense (55) (82)
Capital investments $ 17 $ 18