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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)