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Revenue (Disaggregation) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | $ 5,506 | $ 6,111
Total operating revenues | 5,506 | 6,111
Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 2,480 | 2,607
Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1,494 | 1,430
Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 474 | 744
Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1,058 | 1,119
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 29 | 282
Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 5,506 | 6,111
Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,480 | 2,607
Total operating revenues | 2,473 | 2,596
Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,494 | 1,430
Total operating revenues | 1,494 | 1,429
Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 474 | 744
Total operating revenues | 474 | 744
Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,058 | 1,119
Total operating revenues | 1,051 | 1,097
Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 29 | 282
Total operating revenues | 14 | 245
Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (29) | (71)
Total operating revenues | (19) | (43)
Eliminations | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 7 | 11
Eliminations | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 1
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 | 7 | 22
Eliminations | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 15 | 37
Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 30 | 261
Total operating revenues | 30 | 261
Non-Regulated | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 38
Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Non-Regulated | Operating | Florida Electric Utility | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Non-Regulated | Operating | Canadian Electric Utilities | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Non-Regulated | Operating | Other Electric Utilities | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 16 | 16
Non-Regulated | Operating | Gas Utilities and Infrastructure | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 29 | 282
Non-Regulated | Operating | Other | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 38
Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (15) | (37)
Non-Regulated | Eliminations | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Electric | Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 4,442 | 4,769
Total operating revenues | 4,442 | 4,769
Electric | Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,480 | 2,607
Electric | Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,494 | 1,430
Electric | Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 474 | 744
Electric | Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1 | 0
Electric | Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (7) | (12)
Electric | Regulated | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,350 | 2,409
Electric | Regulated | Residential | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,365 | 1,387
Electric | Regulated | Residential | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 806 | 746
Electric | Regulated | Residential | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 179 | 276
Electric | Regulated | Residential | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Residential | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Residential | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,316 | 1,484
Electric | Regulated | Commercial | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 678 | 745
Electric | Regulated | Commercial | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 405 | 400
Electric | Regulated | Commercial | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 233 | 339
Electric | Regulated | Commercial | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Commercial | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Commercial | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 434 | 461
Electric | Regulated | Industrial | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 178 | 207
Electric | Regulated | Industrial | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 224 | 210
Electric | Regulated | Industrial | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 32 | 44
Electric | Regulated | Industrial | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Industrial | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Industrial | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Other Electric And Regulatory |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 281 | 304
Electric | Regulated | Other Electric And Regulatory | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 242 | 246
Electric | Regulated | Other Electric And Regulatory | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 31 | 45
Electric | Regulated | Other Electric And Regulatory | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 8 | 13
Electric | Regulated | Other Electric And Regulatory | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Other Electric And Regulatory | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Other Electric And Regulatory | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,034 | 1,081
Total operating revenues | 1,034 | 1,081
Gas | Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,041 | 1,103
Gas | Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (7) | (22)
Gas | Regulated | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 495 | 502
Gas | Regulated | Residential | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Residential | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Residential | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Residential | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 495 | 502
Gas | Regulated | Residential | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Residential | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 275 | 298
Gas | Regulated | Commercial | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Commercial | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Commercial | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Commercial | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 275 | 298
Gas | Regulated | Commercial | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Commercial | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 54 | 50
Gas | Regulated | Industrial | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Industrial | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Industrial | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Industrial | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 54 | 50
Gas | Regulated | Industrial | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Industrial | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 149 | 171
Gas | Regulated | Other | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 156 | 193
Gas | Regulated | Other | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Other | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (7) | (22)
Marketing and trading margin | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 38 | 31
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 | 38 | 31
Marketing and trading margin | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Energy sales | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 68
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
Energy sales | Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Energy sales | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 16 | 80
Energy sales | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | (16) | (12)
Finance Income | Regulated | Repsol Energy Canada |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | 61 | 60
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 | 61 | 60
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 | 0
Other | Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 61 | 111
Other | Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 17 | 22
Other | Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 28 | 29
Other | Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 22 | 72
Other | Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1 | 0
Other | Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 0 | 0
Other | Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | (7) | (12)
Other | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 37 | 22
Other | Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Other | Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Other | Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Other | Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 16 | 16
Other | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 21 | 31
Other | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | (25)
Mark-To-Market | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | (45) | 102
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 | (46) | 102
Mark-To-Market | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue which does not represent revenues from contracts with customers | $ 1 | $ 0

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