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SUPPLEMENTAL FINANCIAL INFORMATION (Condensed Consolidated Statements of Income) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenues [Abstract]    
Regulated electric $ 4,721.0 $ 3,437.0
Regulated 1,002.0 499.0
Non-regulated 503.0 341.0
Total operating revenues 6,226.0 4,277.0
Operating expenses    
Regulated fuel for generation and purchased power 1,638.0 1,283.0
Regulated cost of natural gas 379.0 177.0
Regulated fuel adjustment 59.0 61.0
Non-regulated fuel for generation and purchased power 209.0 313.0
Non-regulated direct costs 28.0 29.0
Operating, maintenance and general 1,399.0 1,137.0
Provincial, state, and municipal taxes 326.0 195.0
Depreciation and amortization 856.0 588.0
Total operating expenses 4,835.0 3,722.0
Operating Income (Loss) 1,391.0 555.0
Income from equity investments 124.0 100.0
Other income (expenses), net 2.0 174.0
Interest expense, net (698.0) (585.0)
Income before provision for income taxes 819.0 244.0
Income tax expense (recovery) 520.0 (22.0)
Net income 299.0 266.0
Non-controlling interest in subsidiaries 5.0 11.0
Preferred stock dividends 28.0 28.0
Net income attributable to common shareholders 266.1 227.2
Comprehensive income attributable to common shareholders 0.0 228.0
Consolidation, Eliminations [Member]    
Revenues [Abstract]    
Total operating revenues (57.0) (35.0)
Operating expenses    
Total operating expenses (57.0) (35.0)
Operating Income (Loss) 0.0 0.0
Income (Loss) from Subsidiaries, before Tax (336.0) (150.0)
Income from equity investments 0.0 0.0
Intercompany income (expenses), net (38.0) (46.0)
Other income (expenses), net 5.0 0.0
Interest expense, net 0.0 0.0
Income before provision for income taxes (369.0) (196.0)
Income tax expense (recovery) 0.0 0.0
Net income (369.0) (196.0)
Non-controlling interest in subsidiaries 4.0 4.0
Preferred stock dividends (42.0) (50.0)
Net income attributable to common shareholders (331.0) (150.0)
Comprehensive income attributable to common shareholders 17.0 (283.0)
Parent Company [Member]    
Revenues [Abstract]    
Total operating revenues 0.0 0.0
Operating expenses    
Total operating expenses 41.0 39.0
Operating Income (Loss) (41.0) (39.0)
Income (Loss) from Subsidiaries, before Tax 336.0 150.0
Income from equity investments 1.0 18.0
Intercompany income (expenses), net 92.0 203.0
Other income (expenses), net 0.0 135.0
Interest expense, net 138.0 226.0
Income before provision for income taxes 250.0 241.0
Income tax expense (recovery) (44.0) (14.0)
Net income 294.0 255.0
Non-controlling interest in subsidiaries 0.0 0.0
Preferred stock dividends 28.0 28.0
Net income attributable to common shareholders 266.0 227.0
Comprehensive income attributable to common shareholders 0.0 228.0
Subsidiary Issuer [Member]    
Revenues [Abstract]    
Total operating revenues 0.0 0.0
Operating expenses    
Total operating expenses 0.0 0.0
Operating Income (Loss) 0.0 0.0
Income (Loss) from Subsidiaries, before Tax 0.0 0.0
Income from equity investments 0.0 0.0
Intercompany income (expenses), net 195.0 101.0
Other income (expenses), net 0.0 0.0
Interest expense, net 155.0 85.0
Income before provision for income taxes 40.0 16.0
Income tax expense (recovery) 17.0 7.0
Net income 23.0 9.0
Non-controlling interest in subsidiaries 0.0 0.0
Preferred stock dividends 0.0 0.0
Net income attributable to common shareholders 23.0 9.0
Comprehensive income attributable to common shareholders 3.0 19.0
Guarantor Subsidiaries [Member]    
Revenues [Abstract]    
Total operating revenues 4,165.0 2,494.0
Operating expenses    
Total operating expenses 3,241.0 2,127.0
Operating Income (Loss) 924.0 367.0
Income (Loss) from Subsidiaries, before Tax 0.0 0.0
Income from equity investments 1.0 0.0
Intercompany income (expenses), net (204.0) (107.0)
Other income (expenses), net 16.0 24.0
Interest expense, net 242.0 127.0
Income before provision for income taxes 495.0 157.0
Income tax expense (recovery) 511.0 48.0
Net income (16.0) 109.0
Non-controlling interest in subsidiaries 0.0 0.0
Preferred stock dividends 29.0 31.0
Net income attributable to common shareholders (45.0) 78.0
Comprehensive income attributable to common shareholders (392.0) 205.0
Non-Guarantor Subsidiaries [Member]    
Revenues [Abstract]    
Total operating revenues 2,118.0 1,818.0
Operating expenses    
Total operating expenses 1,610.0 1,591.0
Operating Income (Loss) 508.0 227.0
Income (Loss) from Subsidiaries, before Tax 0.0 0.0
Income from equity investments 122.0 82.0
Intercompany income (expenses), net (45.0) (151.0)
Other income (expenses), net (19.0) 15.0
Interest expense, net 163.0 147.0
Income before provision for income taxes 403.0 26.0
Income tax expense (recovery) 36.0 (63.0)
Net income 367.0 89.0
Non-controlling interest in subsidiaries 1.0 7.0
Preferred stock dividends 13.0 19.0
Net income attributable to common shareholders 353.0 63.0
Comprehensive income attributable to common shareholders $ 372.0 $ 59.0