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Segment Information (Reportable Segments) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information, For the year ended December 31      
Total operating revenues $ 7,563.0 $ 7,588.0  
OM&G 1,879.0 1,596.0  
Provincial, state and municipal taxes 433.0 367.0  
Depreciation and amortization 1,049.0 952.0  
Income from equity investments 146.0 129.0  
Other income (expenses), net 158.0 145.0  
Interest expense, net 925.0 709.0  
GBPC Impairment charge 0.0 73.0  
Income tax expense (recovery) 128.0 185.0  
Non-controlling interest in subsidiaries 1.0 1.0  
Preferred stock dividends 66.0 63.0  
Net income (loss) attributable to common shareholders 977.7 945.1  
Capital expenditures 2,921.0 2,575.0  
Segment Reporting Information, As at December 31      
Total assets 39,480.0 39,742.0  
Investments subject to significant influence 1,402.0 1,418.0  
Goodwill 5,871.0 6,012.0 $ 5,696.0
Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 5,746.0 5,473.0  
Fuel for generation and purchased power 1,881.0 2,171.0  
Regulated | Natural gas      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 1,489.0 1,681.0  
Fuel for generation and purchased power 527.0 800.0  
Florida Electric Utility      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 3,548.0 3,280.0  
Canadian Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 1,671.0 1,675.0  
Gas Utilities and Infrastructure      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 1,510.0 1,697.0  
Other Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 526.0 518.0  
Other      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 308.0 418.0  
Operating      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 7,563.0 7,588.0  
Operating | Florida Electric Utility      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 3,556.0 3,287.0  
OM&G 830.0 625.0  
Provincial, state and municipal taxes 289.0 235.0  
Depreciation and amortization 571.0 507.0  
Income from equity investments 0.0 0.0  
Other income (expenses), net 69.0 68.0  
Interest expense, net 271.0 185.0  
GBPC Impairment charge   0.0  
Income tax expense (recovery) 117.0 121.0  
Non-controlling interest in subsidiaries 0.0 0.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 627.0 596.0  
Capital expenditures 1,736.0 1,425.0  
Segment Reporting Information, As at December 31      
Total assets 21,119.0 21,053.0  
Investments subject to significant influence 0.0 0.0  
Goodwill 4,628.0 4,739.0  
Operating | Florida Electric Utility | Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power 920.0 1,086.0  
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 1,671.0 1,675.0  
OM&G 384.0 338.0  
Provincial, state and municipal taxes 45.0 43.0  
Depreciation and amortization 276.0 259.0  
Income from equity investments 109.0 87.0  
Other income (expenses), net 32.0 24.0  
Interest expense, net 170.0 136.0  
GBPC Impairment charge   0.0  
Income tax expense (recovery) (9.0) (8.0)  
Non-controlling interest in subsidiaries 0.0 0.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 247.0 215.0  
Capital expenditures 450.0 507.0  
Segment Reporting Information, As at December 31      
Total assets 8,634.0 8,223.0  
Investments subject to significant influence 1,236.0 1,241.0  
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 699.0 803.0  
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 1,524.0 1,704.0  
OM&G 405.0 365.0  
Provincial, state and municipal taxes 91.0 83.0  
Depreciation and amortization 126.0 118.0  
Income from equity investments 21.0 21.0  
Other income (expenses), net 11.0 13.0  
Interest expense, net 129.0 81.0  
GBPC Impairment charge   0.0  
Income tax expense (recovery) 64.0 70.0  
Non-controlling interest in subsidiaries 0.0 0.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 214.0 221.0  
Capital expenditures 664.0 574.0  
Segment Reporting Information, As at December 31      
Total assets 7,735.0 7,737.0  
Investments subject to significant influence 118.0 128.0  
Goodwill 1,240.0 1,270.0  
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 527.0 800.0  
Operating | Other Electric Utilities      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 526.0 518.0  
OM&G 130.0 123.0  
Provincial, state and municipal taxes 3.0 3.0  
Depreciation and amortization 68.0 61.0  
Income from equity investments 4.0 4.0  
Other income (expenses), net 7.0 0.0  
Interest expense, net 23.0 19.0  
GBPC Impairment charge   73.0  
Income tax expense (recovery) 0.0 0.0  
Non-controlling interest in subsidiaries 1.0 1.0  
Preferred stock dividends 0.0 0.0  
Net income (loss) attributable to common shareholders 37.0 (48.0)  
Capital expenditures 63.0 63.0  
Segment Reporting Information, As at December 31      
Total assets 1,311.0 1,337.0  
Investments subject to significant influence 48.0 49.0  
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 275.0 290.0  
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 339.0 440.0  
OM&G 151.0 156.0  
Provincial, state and municipal taxes 5.0 3.0  
Depreciation and amortization 8.0 7.0  
Income from equity investments 12.0 17.0  
Other income (expenses), net 20.0 23.0  
Interest expense, net 332.0 288.0  
GBPC Impairment charge   0.0  
Income tax expense (recovery) (44.0) 2.0  
Non-controlling interest in subsidiaries 0.0 0.0  
Preferred stock dividends 66.0 63.0  
Net income (loss) attributable to common shareholders (147.0) (39.0)  
Capital expenditures 8.0 6.0  
Segment Reporting Information, As at December 31      
Total assets 1,938.0 2,835.0  
Investments subject to significant influence 0.0 0.0  
Goodwill 3.0 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 (53.0) (36.0)  
OM&G (21.0) (11.0)  
Provincial, state and municipal taxes 0.0 0.0  
Depreciation and amortization 0.0 0.0  
Income from equity investments 0.0 0.0  
Other income (expenses), net 19.0 17.0  
Interest expense, net 0.0 0.0  
GBPC Impairment charge   0.0  
Income tax expense (recovery) 0.0 0.0  
Non-controlling interest 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 (1,257.0) (1,443.0)  
Investments subject to significant influence 0.0 0.0  
Goodwill 0.0 0.0  
Financing costs 95.0 13.0  
Intersegment Eliminations | Regulated | Electric Revenue      
Segment Reporting Information, For the year ended December 31      
Fuel for generation and purchased power (13.0) (8.0)  
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 (53.0) (36.0)  
Eliminations | Florida Electric Utility      
Segment Reporting Information, For the year ended December 31      
Total operating revenues 8.0 7.0  
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 7.0  
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 $ 31.0 $ 22.0