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Segmented Information - Information by Reportable Segment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenue $ 11,508 $ 11,517  
Energy supply costs 3,249 3,771  
Operating expenses 3,040 2,889  
Depreciation and amortization 1,927 1,773  
Operating income 3,292 3,084  
Other income, net 288 291  
Finance charges 1,406 1,305  
Income tax expense 346 360  
Net earnings 1,828 1,710  
Non-controlling interests 148 137  
Preference share dividends 74 67  
Net earnings attributable to common equity shareholders 1,606 1,506  
Additions to property, plant and equipment and intangible assets 5,218 4,169  
Goodwill 13,112 12,184 $ 12,464
Total assets 73,486 65,920  
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Revenue 0 0  
Energy supply costs 0 0  
Operating expenses 0 0  
Depreciation and amortization 0 0  
Operating income 0 0  
Other income, net 0 0  
Finance charges 0 0  
Income tax expense 0 0  
Net earnings 0 0  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 0 0  
Additions to property, plant and equipment and intangible assets 0 0  
Goodwill 0 0  
Total assets (12) (34)  
Regulated | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 11,473 11,433  
Energy supply costs 3,249 3,771  
Operating expenses 2,991 2,817  
Depreciation and amortization 1,920 1,764  
Operating income 3,313 3,081  
Other income, net 296 252  
Finance charges 1,181 1,092  
Income tax expense 453 441  
Net earnings 1,975 1,800  
Non-controlling interests 148 137  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 1,827 1,663  
Additions to property, plant and equipment and intangible assets 5,213 4,153  
Goodwill 13,112 12,184  
Total assets 73,124 65,553  
Regulated | Operating Segments | ITC      
Segment Reporting Information [Line Items]      
Revenue 2,229 2,085  
Energy supply costs 0 0  
Operating expenses 530 494  
Depreciation and amortization 448 416  
Operating income 1,251 1,175  
Other income, net 96 82  
Finance charges 483 427  
Income tax expense 200 208  
Net earnings 664 622  
Non-controlling interests 122 114  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 542 508  
Additions to property, plant and equipment and intangible assets 1,456 1,103  
Goodwill 8,828 8,127  
Total assets 27,202 24,269  
Regulated | Operating Segments | UNS Energy      
Segment Reporting Information [Line Items]      
Revenue 3,007 3,006  
Energy supply costs 1,183 1,290  
Operating expenses 798 776  
Depreciation and amortization 404 361  
Operating income 622 579  
Other income, net 51 49  
Finance charges 155 145  
Income tax expense 70 83  
Net earnings 448 400  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 448 400  
Additions to property, plant and equipment and intangible assets 1,151 916  
Goodwill 1,987 1,830  
Total assets 14,690 12,784  
Regulated | Operating Segments | Central Hudson      
Segment Reporting Information [Line Items]      
Revenue 1,372 1,360  
Energy supply costs 393 499  
Operating expenses 659 601  
Depreciation and amortization 134 113  
Operating income 186 147  
Other income, net 58 54  
Finance charges 79 67  
Income tax expense 37 29  
Net earnings 128 105  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 128 105  
Additions to property, plant and equipment and intangible assets 431 341  
Goodwill 649 597  
Total assets 6,278 5,371  
Regulated | Operating Segments | FortisBC Energy      
Segment Reporting Information [Line Items]      
Revenue 1,665 1,955  
Energy supply costs 423 760  
Operating expenses 418 408  
Depreciation and amortization 337 309  
Operating income 487 478  
Other income, net 45 34  
Finance charges 155 163  
Income tax expense 83 74  
Net earnings 294 275  
Non-controlling interests 1 1  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 293 274  
Additions to property, plant and equipment and intangible assets 1,035 593  
Goodwill 913 913  
Total assets 10,156 9,225  
Regulated | Operating Segments | FortisAlberta      
Segment Reporting Information [Line Items]      
Revenue 817 738  
Energy supply costs 0 0  
Operating expenses 195 180  
Depreciation and amortization 291 265  
Operating income 331 293  
Other income, net 11 6  
Finance charges 135 125  
Income tax expense 26 12  
Net earnings 181 162  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 181 162  
Additions to property, plant and equipment and intangible assets 554 608  
Goodwill 231 228  
Total assets 6,181 5,962  
Regulated | Operating Segments | FortisBC Electric      
Segment Reporting Information [Line Items]      
Revenue 545 528  
Energy supply costs 155 153  
Operating expenses 141 127  
Depreciation and amortization 88 96  
Operating income 161 152  
Other income, net 6 4  
Finance charges 81 79  
Income tax expense 14 9  
Net earnings 72 68  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 72 68  
Additions to property, plant and equipment and intangible assets 132 126  
Goodwill 235 235  
Total assets 2,807 2,715  
Regulated | Operating Segments | Other Electric      
Segment Reporting Information [Line Items]      
Revenue 1,838 1,761  
Energy supply costs 1,095 1,069  
Operating expenses 250 231  
Depreciation and amortization 218 204  
Operating income 275 257  
Other income, net 29 23  
Finance charges 93 86  
Income tax expense 23 26  
Net earnings 188 168  
Non-controlling interests 25 22  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 163 146  
Additions to property, plant and equipment and intangible assets 454 466  
Goodwill 269 254  
Total assets 5,810 5,227  
Non-Regulated | Operating Segments | Corporate Segment and Other Operating Segment      
Segment Reporting Information [Line Items]      
Revenue 35 84  
Energy supply costs 0 0  
Operating expenses 49 72  
Depreciation and amortization 7 9  
Operating income (21) 3  
Other income, net (8) 39  
Finance charges 225 213  
Income tax expense (107) (81)  
Net earnings (147) (90)  
Non-controlling interests 0 0  
Preference share dividends 74 67  
Net earnings attributable to common equity shareholders (221) (157)  
Additions to property, plant and equipment and intangible assets 5 16  
Goodwill 0 0  
Total assets $ 374 $ 401