v3.26.1
Segmented Information - Information by Reportable Segment (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Revenue $ 2,931 $ 2,815 $ 6,334 $ 6,153  
Energy supply costs 719 714 1,790 1,754  
Operating expenses 866 789 1,711 1,619  
Depreciation and amortization 542 512 1,074 1,027  
Operating income 804 800 1,759 1,753  
Other income, net 119 105 210 196  
Finance charges 387 369 759 739  
Income tax expense 76 92 188 208  
Net earnings 460 444 1,022 1,002  
Non-controlling interests 43 40 82 78  
Preference equity shareholders 21 20 43 41  
Net earnings attributable to common equity shareholders 396 384 897 883  
Additions to property, plant and equipment and intangible assets 1,664 1,544 3,212 3,087  
Goodwill 12,908 12,483 12,908 12,483 $ 12,527
Total assets 78,764 72,789 78,764 72,789 $ 74,830
Inter-segment eliminations          
Segment Reporting [Line Items]          
Revenue 0 0 0 0  
Energy supply costs 0 0 0 0  
Operating expenses 0 0 0 0  
Depreciation and amortization 0 0 0 0  
Operating income 0 0 0 0  
Other income, net 0 0 0 0  
Finance charges 0 0 0 0  
Income tax expense 0 0 0 0  
Net earnings 0 0 0 0  
Non-controlling interests 0 0 0 0  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 0 0 0 0  
Additions to property, plant and equipment and intangible assets 0 0 0 0  
Goodwill 0 0 0 0  
Total assets (10) (11) (10) (11)  
Regulated | Operating segments          
Segment Reporting [Line Items]          
Revenue 2,931 2,807 6,334 6,136  
Energy supply costs 719 714 1,790 1,754  
Operating expenses 854 779 1,681 1,583  
Depreciation and amortization 541 510 1,073 1,023  
Operating income 817 804 1,790 1,776  
Other income, net 105 76 190 156  
Finance charges 326 308 635 620  
Income tax expense 100 106 253 256  
Net earnings 496 466 1,092 1,056  
Non-controlling interests 43 40 82 78  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 453 426 1,010 978  
Additions to property, plant and equipment and intangible assets 1,664 1,543 3,212 3,085  
Goodwill 12,908 12,483 12,908 12,483  
Total assets 78,498 72,383 78,498 72,383  
Regulated | Operating segments | ITC          
Segment Reporting [Line Items]          
Revenue 659 614 1,307 1,245  
Energy supply costs 0 0 0 0  
Operating expenses 176 154 350 317  
Depreciation and amortization 130 119 254 240  
Operating income 353 341 703 688  
Other income, net 31 18 53 39  
Finance charges 145 128 275 258  
Income tax expense 53 56 107 110  
Net earnings 186 175 374 359  
Non-controlling interests 34 32 69 66  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 152 143 305 293  
Additions to property, plant and equipment and intangible assets 472 419 1,018 928  
Goodwill 8,712 8,351 8,712 8,351  
Total assets 29,487 26,566 29,487 26,566  
Regulated | Operating segments | UNS Energy          
Segment Reporting [Line Items]          
Revenue 707 694 1,302 1,374  
Energy supply costs 219 246 423 505  
Operating expenses 231 203 434 397  
Depreciation and amortization 112 105 221 213  
Operating income 145 140 224 259  
Other income, net 25 21 43 39  
Finance charges 42 43 82 85  
Income tax expense 14 14 20 28  
Net earnings 114 104 165 185  
Non-controlling interests 0 0 0 0  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 114 104 165 185  
Additions to property, plant and equipment and intangible assets 258 454 517 743  
Goodwill 1,961 1,880 1,961 1,880  
Total assets 15,949 14,496 15,949 14,496  
Regulated | Operating segments | Central Hudson          
Segment Reporting [Line Items]          
Revenue 401 347 967 820  
Energy supply costs 141 104 367 261  
Operating expenses 180 166 371 352  
Depreciation and amortization 43 38 85 78  
Operating income 37 39 144 129  
Other income, net 21 17 43 37  
Finance charges 25 23 50 48  
Income tax expense 8 8 33 28  
Net earnings 25 25 104 90  
Non-controlling interests 0 0 0 0  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 25 25 104 90  
Additions to property, plant and equipment and intangible assets 115 110 210 209  
Goodwill 640 614 640 614  
Total assets 6,935 6,065 6,935 6,065  
Regulated | Operating segments | FortisBC Energy          
Segment Reporting [Line Items]          
Revenue 392 372 1,088 1,017  
Energy supply costs 92 97 328 319  
Operating expenses 115 105 223 211  
Depreciation and amortization 102 90 206 179  
Operating income 83 80 331 308  
Other income, net 15 13 27 24  
Finance charges 37 36 75 76  
Income tax expense 11 10 62 53  
Net earnings 50 47 221 203  
Non-controlling interests 1 1 1 1  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 49 46 220 202  
Additions to property, plant and equipment and intangible assets 507 240 856 577  
Goodwill 913 913 913 913  
Total assets 11,022 10,253 11,022 10,253  
Regulated | Operating segments | FortisAlberta          
Segment Reporting [Line Items]          
Revenue 213 207 421 408  
Energy supply costs 0 0 0 0  
Operating expenses 53 52 102 102  
Depreciation and amortization 80 77 160 153  
Operating income 80 78 159 153  
Other income, net 2 2 3 3  
Finance charges 36 34 71 67  
Income tax expense 3 5 7 11  
Net earnings 43 41 84 78  
Non-controlling interests 0 0 0 0  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 43 41 84 78  
Additions to property, plant and equipment and intangible assets 154 148 328 288  
Goodwill 231 231 231 231  
Total assets 6,723 6,317 6,723 6,317  
Regulated | Operating segments | FortisBC Electric          
Segment Reporting [Line Items]          
Revenue 127 126 278 279  
Energy supply costs 23 25 69 78  
Operating expenses 39 36 77 72  
Depreciation and amortization 21 20 43 40  
Operating income 44 45 89 89  
Other income, net 2 1 3 2  
Finance charges 20 20 41 40  
Income tax expense 2 5 5 9  
Net earnings 24 21 46 42  
Non-controlling interests 0 0 0 0  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 24 21 46 42  
Additions to property, plant and equipment and intangible assets 56 43 98 77  
Goodwill 235 235 235 235  
Total assets 3,029 2,856 3,029 2,856  
Regulated | Operating segments | Other Electric          
Segment Reporting [Line Items]          
Revenue 432 447 971 993  
Energy supply costs 244 242 603 591  
Operating expenses 60 63 124 132  
Depreciation and amortization 53 61 104 120  
Operating income 75 81 140 150  
Other income, net 9 4 18 12  
Finance charges 21 24 41 46  
Income tax expense 9 8 19 17  
Net earnings 54 53 98 99  
Non-controlling interests 8 7 12 11  
Preference equity shareholders 0 0 0 0  
Net earnings attributable to common equity shareholders 46 46 86 88  
Additions to property, plant and equipment and intangible assets 102 129 185 263  
Goodwill 216 259 216 259  
Total assets 5,353 5,830 5,353 5,830  
Non-Regulated | Operating segments | Corporate and Other          
Segment Reporting [Line Items]          
Revenue 0 8 0 17  
Energy supply costs 0 0 0 0  
Operating expenses 12 10 30 36  
Depreciation and amortization 1 2 1 4  
Operating income (13) (4) (31) (23)  
Other income, net 14 29 20 40  
Finance charges 61 61 124 119  
Income tax expense (24) (14) (65) (48)  
Net earnings (36) (22) (70) (54)  
Non-controlling interests 0 0 0 0  
Preference equity shareholders 21 20 43 41  
Net earnings attributable to common equity shareholders (57) (42) (113) (95)  
Additions to property, plant and equipment and intangible assets 0 1 0 2  
Goodwill 0 0 0 0  
Total assets $ 276 $ 417 $ 276 $ 417