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Revenue (Disaggregation of Revenue by Major Source) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer $ 7,563 $ 7,588
Total operating revenues 7,563 7,588
Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Total operating revenues 3,548 3,280
Canadian Electric Utilities    
Disaggregation of Revenue [Line Items]    
Total operating revenues 1,671 1,675
Other Electric Utilities    
Disaggregation of Revenue [Line Items]    
Total operating revenues 526 518
Gas Utilities and Infrastructure    
Disaggregation of Revenue [Line Items]    
Total operating revenues 1,510 1,697
Other    
Disaggregation of Revenue [Line Items]    
Total operating revenues 308 418
Operating    
Disaggregation of Revenue [Line Items]    
Total operating revenues 7,563 7,588
Operating | Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 3,556 3,287
Total operating revenues 3,556 3,287
Operating | Canadian Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 1,671 1,675
Total operating revenues 1,671 1,675
Operating | Other Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 526 518
Total operating revenues 526 518
Operating | Gas Utilities and Infrastructure    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 1,524 1,704
Total operating revenues 1,524 1,704
Operating | Other    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 339 440
Total operating revenues 339 440
Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer (53) (36)
Total operating revenues (53) (36)
Eliminations | Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Total operating revenues 8 7
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 7
Eliminations | Other    
Disaggregation of Revenue [Line Items]    
Total operating revenues 31 22
Regulated | Other Electric And Regulatory    
Disaggregation of Revenue [Line Items]    
Total operating revenues 254 335
Non-Regulated    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 328 434
Total operating revenues 328 434
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 21 16
Non-Regulated | Operating | Other    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 339 440
Non-Regulated | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer (32) (22)
Electric Revenue | Regulated    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 7,235 7,154
Total operating revenues 5,746 5,473
Electric Revenue | Regulated | Operating | Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 3,556 3,287
Electric Revenue | Regulated | Operating | Canadian Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 1,671 1,675
Electric Revenue | Regulated | Operating | Other Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 526 518
Electric Revenue | Regulated | Operating | Gas Utilities and Infrastructure    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 1,503 1,688
Electric Revenue | Regulated | Operating | Other    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 0 0
Electric Revenue | Regulated | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer (21) (14)
Electric Revenue | Regulated | Residential    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 4,124 3,617
Electric Revenue | Regulated | Residential | Operating | Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 2,307 1,799
Electric Revenue | Regulated | Residential | Operating | Canadian Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 910 834
Electric Revenue | Regulated | Residential | Operating | Other Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 183 184
Electric Revenue | Regulated | Residential | Operating | Gas Utilities and Infrastructure    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 724 800
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 2,256 2,039
Electric Revenue | Regulated | Commercial | Operating | Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 1,083 869
Electric Revenue | Regulated | Commercial | Operating | Canadian Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 463 427
Electric Revenue | Regulated | Commercial | Operating | Other Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 285 282
Electric Revenue | Regulated | Commercial | Operating | Gas Utilities and Infrastructure    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 425 461
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 606 691
Electric Revenue | Regulated | Industrial | Operating | Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 274 230
Electric Revenue | Regulated | Industrial | Operating | Canadian Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 219 353
Electric Revenue | Regulated | Industrial | Operating | Other Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 33 32
Electric Revenue | Regulated | Industrial | Operating | Gas Utilities and Infrastructure    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 93 83
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 (13) (7)
Electric Revenue | Regulated | Other Electric    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 443 432
Electric Revenue | Regulated | Other Electric | Operating | Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 395 398
Electric Revenue | Regulated | Other Electric | Operating | Canadian Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 41 28
Electric Revenue | Regulated | Other Electric | Operating | Other Electric Utilities    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer 7 6
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 (510) (21)
Electric Revenue | Regulated | Regulatory Deferrals | Operating | Florida Electric Utility    
Disaggregation of Revenue [Line Items]    
Revenue from contract with customer (522) (27)
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 12 6
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 19 18
Electric Revenue | Regulated | Other Electric And Regulatory | Operating | Canadian Electric Utilities    
Disaggregation of Revenue [Line Items]    
Total operating revenues 38 33
Electric Revenue | Regulated | Other Electric And Regulatory | Operating | Other Electric Utilities    
Disaggregation of Revenue [Line Items]    
Total operating revenues 6 8
Gas Revenue | Regulated    
Disaggregation of Revenue [Line Items]    
Total operating revenues 1,489 1,681
Gas Revenue | Regulated | Other Electric And Regulatory | Operating | Gas Utilities and Infrastructure    
Disaggregation of Revenue [Line Items]    
Total operating revenues 199 283
Marketing and trading margin | Non-Regulated    
Disaggregation of Revenue [Line Items]    
Total operating revenues 96 143
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 96 143
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 62 61
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 62 61
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 (8) (7)
Other revenue | Non-Regulated    
Disaggregation of Revenue [Line Items]    
Total operating revenues 25 22
Other revenue | Non-Regulated | Operating | Gas Utilities and Infrastructure    
Disaggregation of Revenue [Line Items]    
Total operating revenues 21 16
Other revenue | Non-Regulated | Operating | Other    
Disaggregation of Revenue [Line Items]    
Total operating revenues 27 16
Other revenue | Non-Regulated | Eliminations    
Disaggregation of Revenue [Line Items]    
Total operating revenues (23) (10)
Mark-To-Market | Non-Regulated    
Disaggregation of Revenue [Line Items]    
Revenue which does not represent revenues from contracts with customers 207 269
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 216 281
Mark-To-Market | Non-Regulated | Eliminations    
Disaggregation of Revenue [Line Items]    
Revenue which does not represent revenues from contracts with customers $ (9) $ (12)