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Segment Disclosures Disclosure of operating segments (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Revenues CAD 2,307 CAD 2,397 CAD 2,267
Fuel and purchased power (Note 5) 1,016 963 1,008
Gross margin 1,291 1,434 1,259
Depreciation and amortization 635 601 545
Asset impairment charges (reversals) (Note 6) 20 28 (2)
Restructuring provision (Note 4) 0 1 22
Taxes, other than income taxes 30 31 29
Finance lease income (Note 7) 54 66 58
Gain on sale of assets and other (Note 4) 2 4 262
Net interest expense (Note 9) (247) (229) (251)
Foreign exchange gain (loss) (1) (5) 4
Earnings (loss) before income taxes (54) 314 221
Contingent rents recognised as income, classified as operating lease 247 221 230
Goodwill (Note 17) 463 464  
Property, plant, and equipment (Note 16) 6,578 6,824 7,173
Intangible assets (Note 18) 364 355 369
Other assets (Note 19) 237 242  
Property, plant and equipment expenditures 338 358 476
Purchase of intangible assets 51 21 26
Mine depreciation 73 63 59
Loss on disposal of property, plant, and equipment 0 0 1
Adjustments for depreciation and amortisation expense 708 664 605
Canada      
Disclosure of operating segments [line items]      
Revenues 1,663 1,828 1,705
Goodwill (Note 17) 417 417  
Property, plant, and equipment (Note 16) 5,353 5,583  
Intangible assets (Note 18) 297 315  
Other assets (Note 19) 105 184  
US      
Disclosure of operating segments [line items]      
Revenues 509 450 448
Goodwill (Note 17) 46 47  
Property, plant, and equipment (Note 16) 619 714  
Intangible assets (Note 18) 25 28  
Other assets (Note 19) 43 42  
Australia      
Disclosure of operating segments [line items]      
Revenues 135 119 114
Goodwill (Note 17) 0 0  
Property, plant, and equipment (Note 16) 606 527  
Intangible assets (Note 18) 42 12  
Other assets (Note 19) 89 16  
Wind and Solar      
Disclosure of operating segments [line items]      
Income from government grants 18 19 20
Reportable segments [member]      
Disclosure of operating segments [line items]      
Revenues 2,307 2,397 2,267
Fuel and purchased power (Note 5) 1,016 963 1,008
Gross margin 1,291 1,434 1,259
Operations, maintenance, and administration (Note 5) 517 489 492
Depreciation and amortization 635 601 545
Asset impairment charges (reversals) (Note 6) 20 28 (2)
Restructuring provision (Note 4)   1 22
Taxes, other than income taxes 30 31 29
Profit (loss) from operating activities (49) (194) 25
Operating income 138 478 148
Finance lease income (Note 7) 54 66 58
Gain on sale of assets and other (Note 4) 2 4 262
Net interest expense (Note 9) (247) (229) (251)
Foreign exchange gain (loss) (1) (5) 4
Earnings (loss) before income taxes (54) 314 221
Goodwill (Note 17) 463 464  
Property, plant, and equipment (Note 16) 6,578 6,824  
Intangible assets (Note 18) 364 355  
Property, plant and equipment expenditures 338 358 476
Purchase of intangible assets 51 21 26
Reportable segments [member] | Canadian Coal      
Disclosure of operating segments [line items]      
Revenues 999 1,048 912
Fuel and purchased power (Note 5) 585 451 441
Gross margin 414 597 471
Operations, maintenance, and administration (Note 5) 192 178 194
Depreciation and amortization 317 242 237
Asset impairment charges (reversals) (Note 6) 20 0 0
Restructuring provision (Note 4)   0 11
Taxes, other than income taxes 13 13 12
Profit (loss) from operating activities (40) (2) (7)
Operating income (88) 166 24
Finance lease income (Note 7) 0 0 0
Gain on sale of assets and other (Note 4)     0
Goodwill (Note 17) 0 0  
Property, plant, and equipment (Note 16) 2,902 3,069  
Intangible assets (Note 18) 91 93  
Property, plant and equipment expenditures 116 159 179
Purchase of intangible assets 5 3 6
Reportable segments [member] | United States Coal      
Disclosure of operating segments [line items]      
Revenues 435 354 372
Fuel and purchased power (Note 5) 293 281 316
Gross margin 142 73 56
Operations, maintenance, and administration (Note 5) 51 54 50
Depreciation and amortization 73 61 63
Asset impairment charges (reversals) (Note 6) 0 0 (2)
Restructuring provision (Note 4)   0 1
Taxes, other than income taxes 4 4 3
Profit (loss) from operating activities 0 0 0
Operating income 14 (46) (59)
Finance lease income (Note 7) 0 0 0
Gain on sale of assets and other (Note 4)     0
Goodwill (Note 17) 0 0  
Property, plant, and equipment (Note 16) 370 428  
Intangible assets (Note 18) 7 7  
Property, plant and equipment expenditures 35 15 13
Purchase of intangible assets 1 1 0
Reportable segments [member] | Canadian Gas      
Disclosure of operating segments [line items]      
Revenues 261 402 454
Fuel and purchased power (Note 5) 101 185 204
Gross margin 160 217 250
Operations, maintenance, and administration (Note 5) 50 54 67
Depreciation and amortization 38 100 75
Asset impairment charges (reversals) (Note 6) 0 0 0
Restructuring provision (Note 4)   0 1
Taxes, other than income taxes 1 1 3
Profit (loss) from operating activities (9) (191) 0
Operating income 80 253 104
Finance lease income (Note 7) 11 14 9
Gain on sale of assets and other (Note 4)     262
Goodwill (Note 17) 0 0  
Property, plant, and equipment (Note 16) 416 414  
Intangible assets (Note 18) 3 4  
Property, plant and equipment expenditures 31 11 19
Purchase of intangible assets 0 1 0
Reportable segments [member] | Australian Gas      
Disclosure of operating segments [line items]      
Revenues 135 119 114
Fuel and purchased power (Note 5) 14 20 20
Gross margin 121 99 94
Operations, maintenance, and administration (Note 5) 31 25 21
Depreciation and amortization 37 17 20
Asset impairment charges (reversals) (Note 6) 0 0 0
Restructuring provision (Note 4)   0 0
Taxes, other than income taxes 0 1 0
Profit (loss) from operating activities 0 0 0
Operating income 53 56 53
Finance lease income (Note 7) 43 52 49
Gain on sale of assets and other (Note 4)     0
Goodwill (Note 17) 0    
Property, plant, and equipment (Note 16) 606 527  
Intangible assets (Note 18) 42 12  
Property, plant and equipment expenditures 114 107 204
Purchase of intangible assets 29 0 0
Reportable segments [member] | Wind and Solar      
Disclosure of operating segments [line items]      
Revenues 287 272 250
Fuel and purchased power (Note 5) 17 18 19
Gross margin 270 254 231
Operations, maintenance, and administration (Note 5) 48 52 48
Depreciation and amortization 111 119 99
Asset impairment charges (reversals) (Note 6) 0 28 0
Restructuring provision (Note 4)   0 0
Taxes, other than income taxes 8 8 7
Profit (loss) from operating activities 0 (1) 0
Operating income 103 48 77
Finance lease income (Note 7) 0 0 0
Gain on sale of assets and other (Note 4)     0
Goodwill (Note 17) 174 175  
Property, plant, and equipment (Note 16) 1,764 1,856  
Intangible assets (Note 18) 149 163  
Property, plant and equipment expenditures 20 16 13
Purchase of intangible assets 0 0 0
Reportable segments [member] | Hydro      
Disclosure of operating segments [line items]      
Revenues 121 126 116
Fuel and purchased power (Note 5) 6 8 8
Gross margin 115 118 108
Operations, maintenance, and administration (Note 5) 37 33 29
Depreciation and amortization 31 33 25
Asset impairment charges (reversals) (Note 6) 0 0 0
Restructuring provision (Note 4)   0 0
Taxes, other than income taxes 3 3 3
Profit (loss) from operating activities 0 0 (24)
Operating income 44 49 75
Finance lease income (Note 7) 0 0 0
Gain on sale of assets and other (Note 4)     0
Goodwill (Note 17) 259 259  
Property, plant, and equipment (Note 16) 497 503  
Intangible assets (Note 18) 3 3  
Property, plant and equipment expenditures 16 43 43
Purchase of intangible assets 0 0 0
Reportable segments [member] | Energy Marketing      
Disclosure of operating segments [line items]      
Revenues 69 76 49
Fuel and purchased power (Note 5) 0 0 0
Gross margin 69 76 49
Operations, maintenance, and administration (Note 5) 24 24 12
Depreciation and amortization 2 3 1
Asset impairment charges (reversals) (Note 6) 0 0 0
Restructuring provision (Note 4)   0 3
Taxes, other than income taxes 0 0 0
Profit (loss) from operating activities 0 0 56
Operating income 43 49 (23)
Finance lease income (Note 7) 0 0 0
Gain on sale of assets and other (Note 4)     0
Goodwill (Note 17) 30 30  
Property, plant, and equipment (Note 16) 1 2  
Intangible assets (Note 18) 13 15  
Property, plant and equipment expenditures 0 0 1
Purchase of intangible assets 0 0 3
Reportable segments [member] | Corporate      
Disclosure of operating segments [line items]      
Revenues 0 0 0
Fuel and purchased power (Note 5) 0 0 0
Gross margin 0 0 0
Operations, maintenance, and administration (Note 5) 84 69 71
Depreciation and amortization 26 26 25
Asset impairment charges (reversals) (Note 6) 0 0 0
Restructuring provision (Note 4)   1 6
Taxes, other than income taxes 1 1 1
Profit (loss) from operating activities 0 0 0
Operating income (111) (97) (103)
Finance lease income (Note 7) 0 0 0
Gain on sale of assets and other (Note 4)     0
Goodwill (Note 17) 0 0  
Property, plant, and equipment (Note 16) 22 25  
Intangible assets (Note 18) 56 58  
Property, plant and equipment expenditures 6 7 4
Purchase of intangible assets CAD 16 CAD 16 CAD 17