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Supplemental Financial Information (Condensed Consolidated Statements of Income) (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 16, 2016 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Income Statements, Captions [Line Items] |  |  |
Total operating revenues |  | $ 6,111.0 | $ 6,524.0
Total operating expenses |  | 4,768.0 | 5,126.0
Income from equity investments (note 7) |  | 154.0 | 154.0
Other expenses, net |  | 12.0 | (23.0)
Interest expense, net |  | 738.0 | 713.0
Income before provision for income taxes |  | 771.0 | 816.0
Income tax expense (note 8) |  | 61.0 | 69.0
Net income |  | 710.0 | 747.0
Non-controlling interest in subsidiaries |  | 2.0 | 1.0
Preferred stock dividends |  | 45.0 | 36.0
Net income (loss) attributable to common shareholders |  | 662.8 | 709.6
Comprehensive Income of Emera Incorporated |  | 465.0 | 1,249.0
Eliminations |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total operating revenues |  | (43.0) | (54.0)
Total operating expenses |  | (42.0) | (52.0)
Income from equity investments (note 7) |  | (752.0) | (800.0)
Other expenses, net |  | (20.0) | (38.0)
Interest expense, net |  | 0.0 | 0.0
Income before provision for income taxes |  | (773.0) | (840.0)
Income tax expense (note 8) |  | 0.0 | 0.0
Net income |  | (773.0) | (840.0)
Non-controlling interest in subsidiaries |  | 2.0 | 2.0
Preferred stock dividends |  | (22.0) | (42.0)
Net income (loss) attributable to common shareholders |  | (753.0) | (800.0)
Comprehensive Income of Emera Incorporated |  | (321.0) | (1,468.0)
Emera Inc. | Reportable Legal Entities |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total operating revenues |  | 0.0 | 0.0
Total operating expenses |  | 31.0 | 45.0
Income from equity investments (note 7) |  | 753.0 | 801.0
Other expenses, net |  | 21.0 | 22.0
Interest expense, net |  | (75.0) | (79.0)
Income before provision for income taxes |  | 668.0 | 699.0
Income tax expense (note 8) |  | (40.0) | (47.0)
Net income |  | 708.0 | 746.0
Non-controlling interest in subsidiaries |  | 0.0 | 0.0
Preferred stock dividends |  | 45.0 | 36.0
Net income (loss) attributable to common shareholders |  | 663.0 | 710.0
Comprehensive Income of Emera Incorporated |  | 465.0 | 1,249.0
Subsidiary Issuer | Reportable Legal Entities |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total operating revenues |  | 0.0 | 0.0
Total operating expenses |  | 0.0 | 0.0
Income from equity investments (note 7) |  | 0.0 | 0.0
Other expenses, net |  | 0.0 | 0.0
Interest expense, net |  | 40.0 | 40.0
Income before provision for income taxes |  | 40.0 | 40.0
Income tax expense (note 8) |  | 11.0 | 9.0
Net income |  | 29.0 | 31.0
Non-controlling interest in subsidiaries |  | 0.0 | 0.0
Preferred stock dividends |  | 0.0 | 0.0
Net income (loss) attributable to common shareholders |  | 29.0 | 31.0
Comprehensive Income of Emera Incorporated |  | 14.0 | 56.0
Emera US Finance LP | Reportable Legal Entities | U.S. Notes |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Proceeds from Issuance of Unsecured Debt | $ 3,250.0 |  |
Guarantor Subsidiaries | Reportable Legal Entities |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total operating revenues |  | 4,125.0 | 4,432.0
Total operating expenses |  | 3,084.0 | 3,468.0
Income from equity investments (note 7) |  | 2.0 | 3.0
Other expenses, net |  | 22.0 | 20.0
Interest expense, net |  | (481.0) | (456.0)
Income before provision for income taxes |  | 584.0 | 531.0
Income tax expense (note 8) |  | 60.0 | 64.0
Net income |  | 524.0 | 467.0
Non-controlling interest in subsidiaries |  | 0.0 | 0.0
Preferred stock dividends |  | 19.0 | 38.0
Net income (loss) attributable to common shareholders |  | 505.0 | 429.0
Comprehensive Income of Emera Incorporated |  | 102.0 | 973.0
Non-guarantor Subsidiaries | Reportable Legal Entities |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total operating revenues |  | 2,029.0 | 2,146.0
Total operating expenses |  | 1,695.0 | 1,665.0
Income from equity investments (note 7) |  | 151.0 | 150.0
Other expenses, net |  | (11.0) | (27.0)
Interest expense, net |  | (222.0) | (218.0)
Income before provision for income taxes |  | 252.0 | 386.0
Income tax expense (note 8) |  | 30.0 | 43.0
Net income |  | 222.0 | 343.0
Non-controlling interest in subsidiaries |  | 0.0 | (1.0)
Preferred stock dividends |  | 3.0 | 4.0
Net income (loss) attributable to common shareholders |  | 219.0 | 340.0
Comprehensive Income of Emera Incorporated |  | $ 205.0 | $ 439.0

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