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Revenue (Disaggregation of Revenue by Major Source) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | $ 7,200 | $ 7,563
Total operating revenues | 7,200 | 7,563
Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 3,451 | 3,548
Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1,855 | 1,671
Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 566 | 526
Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1,595 | 1,510
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | (267) | 308
Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 7,200 | 7,563
Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3,460 | 3,556
Total operating revenues | 3,460 | 3,556
Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,855 | 1,671
Total operating revenues | 1,855 | 1,671
Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 566 | 526
Total operating revenues | 566 | 526
Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,609 | 1,524
Total operating revenues | 1,609 | 1,524
Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (248) | 339
Total operating revenues | (248) | 339
Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (42) | (53)
Total operating revenues | (42) | (53)
Eliminations | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 9 | 8
Eliminations | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Eliminations | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Eliminations | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 14 | 14
Eliminations | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 19 | 31
Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 7,447 | 7,235
Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3,460 | 3,556
Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,855 | 1,671
Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 566 | 526
Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,589 | 1,503
Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (23) | (21)
Regulated | Other Electric And Regulatory |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 290 | 254
Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (247) | 328
Total operating revenues | (247) | 328
Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 20 | 21
Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (248) | 339
Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (19) | (32)
Electric Revenue | Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 5,872 | 5,746
Electric Revenue | Regulated | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 3,975 | 4,124
Electric Revenue | Regulated | Residential | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,063 | 2,307
Electric Revenue | Regulated | Residential | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 997 | 910
Electric Revenue | Regulated | Residential | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 203 | 183
Electric Revenue | Regulated | Residential | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 712 | 724
Electric Revenue | Regulated | Residential | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Residential | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,234 | 2,256
Electric Revenue | Regulated | Commercial | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 939 | 1,083
Electric Revenue | Regulated | Commercial | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 499 | 463
Electric Revenue | Regulated | Commercial | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 300 | 285
Electric Revenue | Regulated | Commercial | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 496 | 425
Electric Revenue | Regulated | Commercial | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Commercial | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 607 | 606
Electric Revenue | Regulated | Industrial | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 223 | 274
Electric Revenue | Regulated | Industrial | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 276 | 219
Electric Revenue | Regulated | Industrial | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 28 | 33
Electric Revenue | Regulated | Industrial | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 94 | 93
Electric Revenue | Regulated | Industrial | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Industrial | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (14) | (13)
Electric Revenue | Regulated | Other Electric |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 420 | 443
Electric Revenue | Regulated | Other Electric | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 372 | 395
Electric Revenue | Regulated | Other Electric | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 41 | 41
Electric Revenue | Regulated | Other Electric | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 7 | 7
Electric Revenue | Regulated | Other Electric | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Other Electric | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Other Electric | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Regulatory Deferrals |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (142) | (510)
Electric Revenue | Regulated | Regulatory Deferrals | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (157) | (522)
Electric Revenue | Regulated | Regulatory Deferrals | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Regulatory Deferrals | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 15 | 12
Electric Revenue | Regulated | Regulatory Deferrals | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Regulatory Deferrals | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Regulatory Deferrals | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric Revenue | Regulated | Other Electric And Regulatory | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 20 | 19
Electric Revenue | Regulated | Other Electric And Regulatory | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 42 | 38
Electric Revenue | Regulated | Other Electric And Regulatory | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 13 | 6
Gas Revenue | Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1,575 | 1,489
Gas Revenue | Regulated | Other Electric And Regulatory | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 224 | 199
Marketing and trading margin | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 77 | 96
Marketing and trading margin | Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Marketing and trading margin | Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Marketing and trading margin | Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Marketing and trading margin | Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Marketing and trading margin | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 77 | 96
Marketing and trading margin | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Energy sales | Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Energy sales | Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Energy sales | Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Finance Income | Regulated | Repsol Energy Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 63 | 62
Finance Income | Regulated | Operating | Florida Electric Utility | Repsol Energy Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 0 | 0
Finance Income | Regulated | Operating | Canadian Electric Utilities | Repsol Energy Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 0 | 0
Finance Income | Regulated | Operating | Other Electric Utilities | Repsol Energy Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 0 | 0
Finance Income | Regulated | Operating | Gas Utilities and Infrastructure | Repsol Energy Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 63 | 62
Finance Income | Regulated | Operating | Other | Repsol Energy Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 0 | 0
Finance Income | Regulated | Eliminations | Repsol Energy Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers |  | 0
Other revenue | Regulated | Other Electric And Regulatory | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Other revenue | Regulated | Other Electric And Regulatory | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | (9) | (8)
Other revenue | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 28 | 25
Other revenue | Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 20 | 21
Other revenue | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 32 | 27
Other revenue | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | (24) | (23)
Mark-To-Market | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | (352) | 207
Mark-To-Market | Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 0 | 0
Mark-To-Market | Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 0 | 0
Mark-To-Market | Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 0 | 0
Mark-To-Market | Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 0 | 0
Mark-To-Market | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | (357) | 216
Mark-To-Market | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | $ 5 | $ (9)

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