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Revenue (Disaggregation) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | $ 6,111 | $ 6,524
Total operating revenues | 6,111 | 6,524
Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 2,607 | 2,679
Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1,430 | 1,440
Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 744 | 745
Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1,119 | 1,098
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 282 | 661
Operating |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 6,111 | 6,524
Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,607 | 2,679
Total operating revenues | 2,596 | 2,670
Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,430 | 1,440
Total operating revenues | 1,429 | 1,437
Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 744 | 745
Total operating revenues | 744 | 745
Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,119 | 1,098
Total operating revenues | 1,097 | 1,062
Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 282 | 661
Total operating revenues | 245 | 610
Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (71) | (99)
Total operating revenues | (43) | (54)
Eliminations | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 11 | 9
Eliminations | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 1 | 3
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 | 22 | 36
Eliminations | Other |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 37 | 51
Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 261 | 628
Total operating revenues | 261 | 628
Non-Regulated | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 38 | 136
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 | 18
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 | 282 | 661
Non-Regulated | Operating | Other | Capacity |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 38 | 136
Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (37) | (51)
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 | 4,769 | 4,852
Total operating revenues | 4,769 | 4,852
Electric | Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,607 | 2,679
Electric | Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,430 | 1,440
Electric | Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 744 | 745
Electric | Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 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 | (12) | (12)
Electric | Regulated | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 2,409 | 2,376
Electric | Regulated | Residential | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,387 | 1,384
Electric | Regulated | Residential | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 746 | 731
Electric | Regulated | Residential | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 276 | 261
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 | 1,484 | 1,510
Electric | Regulated | Commercial | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 745 | 755
Electric | Regulated | Commercial | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 400 | 405
Electric | Regulated | Commercial | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 339 | 350
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 | 461 | 488
Electric | Regulated | Industrial | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 207 | 209
Electric | Regulated | Industrial | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 210 | 233
Electric | Regulated | Industrial | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 44 | 46
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 | 304 | 371
Electric | Regulated | Other Electric And Regulatory | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 246 | 312
Electric | Regulated | Other Electric And Regulatory | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 45 | 43
Electric | Regulated | Other Electric And Regulatory | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 13 | 16
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
Electric | Regulated | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 111 | 107
Electric | Regulated | Other | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 22 | 19
Electric | Regulated | Other | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 29 | 28
Electric | Regulated | Other | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 72 | 72
Electric | Regulated | Other | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Other | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Electric | Regulated | Other | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (12) | (12)
Gas | Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 1,081 | 1,044
Total operating revenues | 1,081 | 1,044
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 | 1,103 | 1,080
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 | (22) | (36)
Gas | Regulated | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 502 | 492
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 | 502 | 492
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 | 298 | 291
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 | 298 | 291
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 | 50 | 49
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 | 50 | 49
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 | Finance Income |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 60 | 57
Gas | Regulated | Finance Income | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Finance Income | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Finance Income | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Finance Income | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 60 | 57
Gas | Regulated | Finance Income | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Finance Income | 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 | 171 | 155
Gas | Regulated | Other | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Other | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Other | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Gas | Regulated | Other | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 193 | 191
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 | (22) | (36)
Marketing and trading margin | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 31 | 115
Marketing and trading margin | Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Marketing and trading margin | Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Marketing and trading margin | Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Marketing and trading margin | Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Marketing and trading margin | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 31 | 115
Marketing and trading margin | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Energy sales | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 68 | 293
Energy sales | Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Energy sales | Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Energy sales | Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Energy sales | Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Energy sales | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 80 | 309
Energy sales | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (12) | (16)
Other | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 22 | 30
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 | 18
Other | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 31 | 47
Other | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | (25) | (35)
Mark-To-Market | Non-Regulated |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 102 | 54
Mark-To-Market | Non-Regulated | Operating | Florida Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Mark-To-Market | Non-Regulated | Operating | Canadian Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Mark-To-Market | Non-Regulated | Operating | Other Electric Utilities |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Mark-To-Market | Non-Regulated | Operating | Gas Utilities and Infrastructure |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 0 | 0
Mark-To-Market | Non-Regulated | Operating | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | 102 | 54
Mark-To-Market | Non-Regulated | Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer | $ 0 | $ 0

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