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SUPPLEMENTAL FINANCIAL INFORMATION (Condensed Consolidated Statements of Income) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenues [Abstract]    
Regulated electric $ 4,852.0 $ 4,721.0
Regulated 1,044.0 1,002.0
Non-regulated 628.0 503.0
Total operating revenues 6,524.0 6,226.0
Operating expenses    
Regulated fuel for generation and purchased power 1,677.0 1,638.0
Regulated cost of natural gas 388.0 379.0
Regulated fuel adjustment (46.0) 59.0
Non-regulated fuel for generation and purchased power 225.0 209.0
Non-regulated direct costs 16.0 28.0
Operating, maintenance and general 1,564.0 1,372.0
Provincial, state, and municipal taxes 340.0 326.0
Depreciation and amortization 916.0 856.0
Total operating expenses 5,126.0 4,808.0
Operating Income (Loss) 1,398.0 1,418.0
Income from equity investments 154.0 124.0
Other income (expenses), net 23.0 25.0
Interest expense, net 713.0 698.0
Income before provision for income taxes 816.0 819.0
Income tax expense (recovery) 69.0 520.0
Net income 747.0 299.0
Non-controlling interest in subsidiaries 1.0 5.0
Preferred stock dividends 36.0 28.0
Net income attributable to common shareholders 709.6 266.1
Comprehensive income attributable to common shareholders 1,249.0 (6.0)
Consolidation, Eliminations [Member]    
Revenues [Abstract]    
Total operating revenues (54.0) (57.0)
Operating expenses    
Total operating expenses (52.0) (57.0)
Income from equity investments (800.0) (336.0)
Other income (expenses), net (38.0) (32.0)
Interest expense, net 0.0 0.0
Income before provision for income taxes (840.0) (368.0)
Income tax expense (recovery) 0.0 0.0
Net income (840.0) (368.0)
Non-controlling interest in subsidiaries 2.0 4.0
Preferred stock dividends (42.0) (42.0)
Net income attributable to common shareholders (800.0) (330.0)
Comprehensive income attributable to common shareholders (1,468.0) 23.0
Parent Company [Member]    
Revenues [Abstract]    
Total operating revenues 0.0 0.0
Operating expenses    
Total operating expenses 45.0 41.0
Income from equity investments 801.0 337.0
Other income (expenses), net 22.0 38.0
Interest expense, net 79.0 84.0
Income before provision for income taxes 699.0 250.0
Income tax expense (recovery) (47.0) (44.0)
Net income 746.0 294.0
Non-controlling interest in subsidiaries 0.0 0.0
Preferred stock dividends 36.0 28.0
Net income attributable to common shareholders 710.0 266.0
Comprehensive income attributable to common shareholders 1,249.0 (6.0)
Subsidiary Issuer [Member]    
Revenues [Abstract]    
Total operating revenues 0.0 0.0
Operating expenses    
Total operating expenses 0.0 0.0
Income from equity investments 0.0 0.0
Other income (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 (recovery) 9.0 17.0
Net income 31.0 23.0
Non-controlling interest in subsidiaries 0.0 0.0
Preferred stock dividends 0.0 0.0
Net income attributable to common shareholders 31.0 23.0
Comprehensive income attributable to common shareholders 56.0 3.0
Guarantor Subsidiaries [Member]    
Revenues [Abstract]    
Total operating revenues 4,432.0 4,274.0
Operating expenses    
Total operating expenses 3,468.0 3,241.0
Income from equity investments 3.0 1.0
Other income (expenses), net 20.0 15.0
Interest expense, net 456.0 451.0
Income before provision for income taxes 531.0 598.0
Income tax expense (recovery) 64.0 511.0
Net income 467.0 87.0
Non-controlling interest in subsidiaries 0.0 0.0
Preferred stock dividends 38.0 29.0
Net income attributable to common shareholders 429.0 58.0
Comprehensive income attributable to common shareholders 973.0 (291.0)
Non-Guarantor Subsidiaries [Member]    
Revenues [Abstract]    
Total operating revenues 2,146.0 2,009.0
Operating expenses    
Total operating expenses 1,665.0 1,583.0
Income from equity investments 150.0 122.0
Other income (expenses), net (27.0) (46.0)
Interest expense, net 218.0 203.0
Income before provision for income taxes 386.0 299.0
Income tax expense (recovery) 43.0 36.0
Net income 343.0 263.0
Non-controlling interest in subsidiaries (1.0) 1.0
Preferred stock dividends 4.0 13.0
Net income attributable to common shareholders 340.0 249.0
Comprehensive income attributable to common shareholders $ 439.0 $ 265.0