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Segmented Information - Information by Reportable Segment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenue $ 11,517 $ 11,043  
Energy supply costs 3,771 3,952  
Operating expenses 2,889 2,683  
Depreciation and amortization 1,773 1,668  
Operating income 3,084 2,740  
Other income, net 291 165  
Finance charges 1,305 1,102  
Income tax expense 360 289  
Net earnings 1,710 1,514  
Non-controlling interests 137 120  
Preference share dividends 67 64  
Net earnings attributable to common equity shareholders 1,506 1,330  
Additions to property, plant and equipment and intangible assets 4,169 3,865  
Goodwill 12,184 12,464 $ 11,720
Total assets 65,920 64,252  
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 (34) (12)  
Regulated | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 11,433 10,892  
Energy supply costs 3,771 3,947  
Operating expenses 2,817 2,623  
Depreciation and amortization 1,764 1,649  
Operating income 3,081 2,673  
Other income, net 252 176  
Finance charges 1,092 936  
Income tax expense 441 356  
Net earnings 1,800 1,557  
Non-controlling interests 137 120  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 1,663 1,437  
Additions to property, plant and equipment and intangible assets 4,153 3,836  
Goodwill 12,184 12,437  
Total assets 65,553 63,221  
Regulated | Operating Segments | ITC      
Segment Reporting Information [Line Items]      
Revenue 2,085 1,906  
Energy supply costs 0 0  
Operating expenses 494 481  
Depreciation and amortization 416 385  
Operating income 1,175 1,040  
Other income, net 82 48  
Finance charges 427 349  
Income tax expense 208 184  
Net earnings 622 555  
Non-controlling interests 114 101  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 508 454  
Additions to property, plant and equipment and intangible assets 1,103 1,212  
Goodwill 8,127 8,318  
Total assets 24,269 23,478  
Regulated | Operating Segments | UNS Energy      
Segment Reporting Information [Line Items]      
Revenue 3,006 2,758  
Energy supply costs 1,290 1,213  
Operating expenses 776 691  
Depreciation and amortization 361 365  
Operating income 579 489  
Other income, net 49 22  
Finance charges 145 127  
Income tax expense 83 56  
Net earnings 400 328  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 400 328  
Additions to property, plant and equipment and intangible assets 916 709  
Goodwill 1,830 1,873  
Total assets 12,784 12,678  
Regulated | Operating Segments | Central Hudson      
Segment Reporting Information [Line Items]      
Revenue 1,360 1,325  
Energy supply costs 499 525  
Operating expenses 601 571  
Depreciation and amortization 113 104  
Operating income 147 125  
Other income, net 54 59  
Finance charges 67 53  
Income tax expense 29 28  
Net earnings 105 103  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 105 103  
Additions to property, plant and equipment and intangible assets 341 293  
Goodwill 597 612  
Total assets 5,371 5,131  
Regulated | Operating Segments | FortisBC Energy      
Segment Reporting Information [Line Items]      
Revenue 1,955 2,084  
Energy supply costs 760 1,055  
Operating expenses 408 364  
Depreciation and amortization 309 298  
Operating income 478 367  
Other income, net 34 22  
Finance charges 163 146  
Income tax expense 74 39  
Net earnings 275 204  
Non-controlling interests 1 1  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 274 203  
Additions to property, plant and equipment and intangible assets 593 589  
Goodwill 913 913  
Total assets 9,225 8,875  
Regulated | Operating Segments | FortisAlberta      
Segment Reporting Information [Line Items]      
Revenue 738 680  
Energy supply costs 0 0  
Operating expenses 180 166  
Depreciation and amortization 265 243  
Operating income 293 271  
Other income, net 6 5  
Finance charges 125 110  
Income tax expense 12 15  
Net earnings 162 151  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 162 151  
Additions to property, plant and equipment and intangible assets 608 510  
Goodwill 228 228  
Total assets 5,962 5,547  
Regulated | Operating Segments | FortisBC Electric      
Segment Reporting Information [Line Items]      
Revenue 528 487  
Energy supply costs 153 141  
Operating expenses 127 133  
Depreciation and amortization 96 67  
Operating income 152 146  
Other income, net 4 6  
Finance charges 79 76  
Income tax expense 9 12  
Net earnings 68 64  
Non-controlling interests 0 0  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 68 64  
Additions to property, plant and equipment and intangible assets 126 130  
Goodwill 235 235  
Total assets 2,715 2,596  
Regulated | Operating Segments | Other Electric      
Segment Reporting Information [Line Items]      
Revenue 1,761 1,652  
Energy supply costs 1,069 1,013  
Operating expenses 231 217  
Depreciation and amortization 204 187  
Operating income 257 235  
Other income, net 23 14  
Finance charges 86 75  
Income tax expense 26 22  
Net earnings 168 152  
Non-controlling interests 22 18  
Preference share dividends 0 0  
Net earnings attributable to common equity shareholders 146 134  
Additions to property, plant and equipment and intangible assets 466 393  
Goodwill 254 258  
Total assets 5,227 4,916  
Non-Regulated | Operating Segments | Corporate and Other      
Segment Reporting Information [Line Items]      
Revenue 84 151  
Energy supply costs 0 5  
Operating expenses 72 60  
Depreciation and amortization 9 19  
Operating income 3 67  
Other income, net 39 (11)  
Finance charges 213 166  
Income tax expense (81) (67)  
Net earnings (90) (43)  
Non-controlling interests 0 0  
Preference share dividends 67 64  
Net earnings attributable to common equity shareholders (157) (107)  
Additions to property, plant and equipment and intangible assets 16 29  
Goodwill 0 27  
Total assets $ 401 $ 1,043