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Segment Information (Segment Information) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information, For the year ended December 31      
Total operating revenues $ 7,200.0 $ 7,563.0  
OM&G 1,918.0 1,879.0  
Provincial, state and municipal taxes 427.0 433.0  
Depreciation and amortization 1,162.0 1,049.0  
Impairment charges 225.0 0.0  
Income from equity investments 99.0 146.0  
Other income (expenses), net 203.0 158.0  
Interest expense, net 973.0 925.0  
Income tax expense (recovery) (159.0) 128.0  
NCI in subsidiaries 1.0 1.0  
Preferred stock dividends 73.0 66.0  
Net income (loss) attributable to common shareholders 493.6 977.7  
Capital expenditures 3,127.0 2,921.0  
Segment Reporting Information, As at December 31      
Total assets 42,951.0 39,480.0  
Investments subject to significant influence 654.0 1,402.0  
Goodwill 5,858.0 5,871.0 $ 6,012.0
Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 5,872.0 5,746.0  
Fuel for generation and purchased power 1,992.0 1,881.0  
Regulated | Natural gas      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 1,575.0 1,489.0  
Fuel for generation and purchased power 396.0 527.0  
Florida Electric Utility      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 3,451.0 3,548.0  
Canadian Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 1,855.0 1,671.0  
Gas Utilities and Infrastructure      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 1,595.0 1,510.0  
Other Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 566.0 526.0  
Other      
Segment Reporting Information, For the year ended December 31      
Total operating revenues (267.0) 308.0  
Operating      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 7,200.0 7,563.0  
Operating | Florida Electric Utility      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 3,460.0 3,556.0  
OM&G 779.0 830.0  
Provincial, state and municipal taxes 273.0 289.0  
Depreciation and amortization 622.0 571.0  
Impairment charges 0.0    
Income from equity investments 0.0 0.0  
Other income (expenses), net 66.0 69.0  
Interest expense, net 265.0 271.0  
Income tax expense (recovery) 94.0 117.0  
NCI in subsidiaries 0.0 0.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 641.0 627.0  
Capital expenditures 1,942.0 1,736.0  
Segment Reporting Information, As at December 31      
Total assets 24,375.0 21,119.0  
Investments subject to significant influence 0.0 0.0  
Goodwill 5,035.0 4,628.0  
Operating | Florida Electric Utility | Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 852.0 920.0  
Operating | Florida Electric Utility | Regulated | Natural gas      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 0.0 0.0  
Operating | Canadian Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 1,855.0 1,671.0  
OM&G 408.0 384.0  
Provincial, state and municipal taxes 48.0 45.0  
Depreciation and amortization 282.0 276.0  
Impairment charges 0.0    
Income from equity investments 73.0 109.0  
Other income (expenses), net 28.0 32.0  
Interest expense, net 168.0 170.0  
Income tax expense (recovery) (41.0) (9.0)  
NCI in subsidiaries 0.0 0.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 232.0 247.0  
Capital expenditures 481.0 450.0  
Segment Reporting Information, As at December 31      
Total assets 7,609.0 8,634.0  
Investments subject to significant influence 475.0 1,236.0  
Goodwill 0.0 0.0  
Operating | Canadian Electric Utilities | Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 859.0 699.0  
Operating | Canadian Electric Utilities | Regulated | Natural gas      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 0.0 0.0  
Operating | Gas Utilities and Infrastructure      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 1,609.0 1,524.0  
OM&G 454.0 405.0  
Provincial, state and municipal taxes 103.0 91.0  
Depreciation and amortization 182.0 126.0  
Impairment charges 11.0    
Income from equity investments 20.0 21.0  
Other income (expenses), net 16.0 11.0  
Interest expense, net 151.0 129.0  
Income tax expense (recovery) 89.0 64.0  
NCI in subsidiaries 0.0 0.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 259.0 214.0  
Capital expenditures 619.0 664.0  
Segment Reporting Information, As at December 31      
Total assets 8,439.0 7,735.0  
Investments subject to significant influence 124.0 118.0  
Goodwill 823.0 1,240.0  
Operating | Gas Utilities and Infrastructure | Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 0.0 0.0  
Operating | Gas Utilities and Infrastructure | Regulated | Natural gas      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 396.0 527.0  
Operating | Other Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 566.0 526.0  
OM&G 143.0 130.0  
Provincial, state and municipal taxes 3.0 3.0  
Depreciation and amortization 69.0 68.0  
Impairment charges 0.0    
Income from equity investments 4.0 4.0  
Other income (expenses), net 12.0 7.0  
Interest expense, net 22.0 23.0  
Income tax expense (recovery) 1.0 0.0  
NCI in subsidiaries 1.0 1.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 48.0 37.0  
Capital expenditures 81.0 63.0  
Segment Reporting Information, As at December 31      
Total assets 1,444.0 1,311.0  
Investments subject to significant influence 55.0 48.0  
Goodwill 0.0 0.0  
Operating | Other Electric Utilities | Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 295.0 275.0  
Operating | Other Electric Utilities | Regulated | Natural gas      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 0.0 0.0  
Operating | Other      
Segment Reporting Information, For the year ended December 31      
Total operating revenues (248.0) 339.0  
OM&G 154.0 151.0  
Provincial, state and municipal taxes 0.0 5.0  
Depreciation and amortization 7.0 8.0  
Impairment charges 214.0    
Income from equity investments 2.0 12.0  
Other income (expenses), net 73.0 20.0  
Interest expense, net 367.0 332.0  
Income tax expense (recovery) (302.0) (44.0)  
NCI in subsidiaries 0.0 0.0  
Preferred stock dividends 73.0 66.0  
Net income (loss) attributable to common shareholders (686.0) (147.0)  
Capital expenditures 4.0 8.0  
Segment Reporting Information, As at December 31      
Total assets 1,810.0 1,938.0  
Investments subject to significant influence 0.0 0.0  
Goodwill 0.0 3.0  
Operating | Other | Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 0.0 0.0  
Operating | Other | Regulated | Natural gas      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 0.0 0.0  
Intersegment Eliminations      
Segment Reporting Information, For the year ended December 31      
Total operating revenues (42.0) (53.0)  
OM&G (20.0) (21.0)  
Provincial, state and municipal taxes 0.0 0.0  
Depreciation and amortization 0.0 0.0  
Impairment charges 0.0    
Income from equity investments 0.0 0.0  
Other income (expenses), net 8.0 19.0  
Interest expense, net 0.0 0.0  
Income tax expense (recovery) 0.0 0.0  
NCI in subsidiaries 0.0 0.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 0.0 0.0  
Capital expenditures 0.0 0.0  
Segment Reporting Information, As at December 31      
Total assets (726.0) (1,257.0)  
Investments subject to significant influence 0.0 0.0  
Goodwill 0.0 0.0  
Financing costs 29.0 95.0  
Intersegment Eliminations | Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power (14.0) (13.0)  
Intersegment Eliminations | Regulated | Natural gas      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 0.0 0.0  
Eliminations      
Segment Reporting Information, For the year ended December 31      
Total operating revenues (42.0) (53.0)  
Eliminations | Florida Electric Utility      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 9.0 8.0  
Eliminations | Canadian Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 0.0 0.0  
Eliminations | Gas Utilities and Infrastructure      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 14.0 14.0  
Eliminations | Other Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 0.0 0.0  
Eliminations | Other      
Segment Reporting Information, For the year ended December 31      
Total operating revenues $ 19.0 $ 31.0