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Supplemental Financial Information (Condensed Consolidated Statements of Income) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Condensed Income Statements, Captions [Line Items] |  |
Total operating revenues | $ 5,506.0 | $ 6,111.0
Total operating expenses | 4,359.0 | 4,768.0
Income (loss) from equity investments and subsidiaries | 149.0 | 154.0
Other income (expenses), net | 708.0 | 12.0
Interest expense, net | 679.0 | 738.0
Income (loss) before provision for income taxes | 1,325.0 | 771.0
Income tax expense (recovery) | 341.0 | 61.0
Net income | 984.0 | 710.0
Non-controlling interest in subsidiaries | 1.0 | 2.0
Preferred stock dividends | 45.0 | 45.0
Net income (loss) attributable to common shareholders | 937.6 | 662.8
Comprehensive Income (loss) of Emera Incorporated | 809.0 | 465.0
Eliminations |  |
Condensed Income Statements, Captions [Line Items] |  |
Total operating revenues | (19.0) | (43.0)
Total operating expenses | (20.0) | (42.0)
Income (loss) from equity investments and subsidiaries | (1,048.0) | (752.0)
Other income (expenses), net | 0.0 | (20.0)
Interest expense, net | 0.0 | 0.0
Income (loss) before provision for income taxes | (1,047.0) | (773.0)
Income tax expense (recovery) | 1.0 | 0.0
Net income | (1,048.0) | (773.0)
Non-controlling interest in subsidiaries | 1.0 | 2.0
Preferred stock dividends | (1.0) | (22.0)
Net income (loss) attributable to common shareholders | (1,048.0) | (753.0)
Comprehensive Income (loss) of Emera Incorporated | (867.0) | (321.0)
Emera Inc. | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Total operating revenues | (1.0) | 0.0
Total operating expenses | 51.0 | 31.0
Income (loss) from equity investments and subsidiaries | 1,049.0 | 753.0
Other income (expenses), net | 20.0 | 21.0
Interest expense, net | 48.0 | 75.0
Income (loss) before provision for income taxes | 969.0 | 668.0
Income tax expense (recovery) | (14.0) | (40.0)
Net income | 983.0 | 708.0
Non-controlling interest in subsidiaries | 0.0 | 0.0
Preferred stock dividends | 45.0 | 45.0
Net income (loss) attributable to common shareholders | 938.0 | 663.0
Comprehensive Income (loss) of Emera Incorporated | 809.0 | 465.0
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 (loss) from equity investments and subsidiaries | 0.0 | 0.0
Other income (expenses), net | 0.0 | 0.0
Interest expense, net | (37.0) | (40.0)
Income (loss) before provision for income taxes | 37.0 | 40.0
Income tax expense (recovery) | (1.0) | 11.0
Net income | 38.0 | 29.0
Non-controlling interest in subsidiaries | 0.0 | 0.0
Preferred stock dividends | 0.0 | 0.0
Net income (loss) attributable to common shareholders | 38.0 | 29.0
Comprehensive Income (loss) of Emera Incorporated | 35.0 | 14.0
Guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Total operating revenues | 3,456.0 | 4,125.0
Total operating expenses | 2,640.0 | 3,084.0
Income (loss) from equity investments and subsidiaries | 1.0 | 2.0
Other income (expenses), net | 687.0 | 22.0
Interest expense, net | 448.0 | 481.0
Income (loss) before provision for income taxes | 1,056.0 | 584.0
Income tax expense (recovery) | 348.0 | 60.0
Net income | 708.0 | 524.0
Non-controlling interest in subsidiaries | 0.0 | 0.0
Preferred stock dividends | 0.0 | 19.0
Net income (loss) attributable to common shareholders | 708.0 | 505.0
Comprehensive Income (loss) of Emera Incorporated | 575.0 | 102.0
Non-guarantor Subsidiaries | Reportable Legal Entities |  |
Condensed Income Statements, Captions [Line Items] |  |
Total operating revenues | 2,070.0 | 2,029.0
Total operating expenses | 1,688.0 | 1,695.0
Income (loss) from equity investments and subsidiaries | 147.0 | 151.0
Other income (expenses), net | 1.0 | (11.0)
Interest expense, net | 220.0 | 222.0
Income (loss) before provision for income taxes | 310.0 | 252.0
Income tax expense (recovery) | 7.0 | 30.0
Net income | 303.0 | 222.0
Non-controlling interest in subsidiaries | 0.0 | 0.0
Preferred stock dividends | 1.0 | 3.0
Net income (loss) attributable to common shareholders | 302.0 | 219.0
Comprehensive Income (loss) of Emera Incorporated | $ 257.0 | $ 205.0

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