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Segment Disclosures Disclosure of operating segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Revenues $ 2,249 $ 2,307 $ 2,397
Fuel and purchased power (Note 6) 1,100 1,016 963
Gross margin 1,149 1,291 1,434
Depreciation and amortization 574 635 601
Asset impairment charges (reversals) (Note 7) 73 20 28
Restructuring provision 0 0 1
Taxes, other than income taxes 31 30 31
Finance lease income 8 54 66
Gain on sale of assets and other 1 2 4
Net interest expense (Note 10) (250) (247) (229)
Foreign exchange gain (loss) (15) (1) (5)
Earnings (loss) before income taxes (96) (54) 314
Goodwill (Note 18) 464 463  
Property, plant and equipment (Note 17) 6,164 6,578 6,824
Intangible assets (Note 19) 373 364 355
Other assets (Note 20) 234 237  
Property, plant and equipment expenditures 277 338 358
Purchase of intangible assets 20 51 21
Mine depreciation 136 73 63
Adjustments for depreciation and amortisation expense 710 708 664
Canada      
Disclosure of operating segments [line items]      
Revenues 1,573 1,663 1,828
Goodwill (Note 18) 417 417  
Property, plant and equipment (Note 17) 4,953 5,353  
Intangible assets (Note 19) 273 297  
Other assets (Note 20) 101 105  
US      
Disclosure of operating segments [line items]      
Revenues 511 509 450
Goodwill (Note 18) 47 46  
Property, plant and equipment (Note 17) 657 619  
Intangible assets (Note 19) 59 25  
Other assets (Note 20) 50 43  
Australia      
Disclosure of operating segments [line items]      
Revenues 165 135 119
Goodwill (Note 18) 0 0  
Property, plant and equipment (Note 17) 554 606  
Intangible assets (Note 19) 41 42  
Other assets (Note 20) 83 89  
Wind and Solar      
Disclosure of operating segments [line items]      
Income from government grants 16 18 19
Reportable segments [member]      
Disclosure of operating segments [line items]      
Revenues 2,249 2,307 2,397
Fuel and purchased power (Note 6) 1,100 1,016 963
Gross margin 1,149 1,291 1,434
Operations, maintenance, and administration (Note 5) 515 517 489
Depreciation and amortization 574 635 601
Asset impairment charges (reversals) (Note 7) 73 20 28
Taxes, other than income taxes 31 30 31
Profit (loss) from operating activities (204) (49) (193)
Operating income 160 138 478
Finance lease income 8 54 66
Gain on sale of assets and other 1 2 4
Net interest expense (Note 10) (250) (247) (229)
Foreign exchange gain (loss) (15) (1) (5)
Earnings (loss) before income taxes (96) (54) 314
Goodwill (Note 18) 464 463  
Property, plant and equipment (Note 17) 6,164 6,578  
Intangible assets (Note 19) 373 364  
Property, plant and equipment expenditures 277 338 358
Purchase of intangible assets 20 51 21
Reportable segments [member] | Canadian Coal      
Disclosure of operating segments [line items]      
Revenues 912 999 1,048
Fuel and purchased power (Note 6) 666 585 451
Gross margin 246 414 597
Operations, maintenance, and administration (Note 5) 171 192 178
Depreciation and amortization 241 317 242
Asset impairment charges (reversals) (Note 7) 38 20 0
Taxes, other than income taxes 13 13 13
Profit (loss) from operating activities (198) (40) (2)
Operating income (19) (88) 166
Finance lease income 0 0 0
Goodwill (Note 18) 0 0  
Property, plant and equipment (Note 17) 2,587 2,902  
Intangible assets (Note 19) 81 91  
Property, plant and equipment expenditures 101 116 159
Purchase of intangible assets 3 5 3
Reportable segments [member] | United States Coal      
Disclosure of operating segments [line items]      
Revenues 442 435 354
Fuel and purchased power (Note 6) 314 293 281
Gross margin 128 142 73
Operations, maintenance, and administration (Note 5) 61 51 54
Depreciation and amortization 74 73 61
Asset impairment charges (reversals) (Note 7) 0 0 0
Taxes, other than income taxes 5 4 4
Profit (loss) from operating activities 0 0 0
Operating income (12) 14 (46)
Finance lease income 0 0 0
Goodwill (Note 18) 0 0  
Property, plant and equipment (Note 17) 332 370  
Intangible assets (Note 19) 7 7  
Property, plant and equipment expenditures 14 35 15
Purchase of intangible assets 0 1 1
Reportable segments [member] | Canadian Gas      
Disclosure of operating segments [line items]      
Revenues 232 261 402
Fuel and purchased power (Note 6) 96 101 185
Gross margin 136 160 217
Operations, maintenance, and administration (Note 5) 48 50 54
Depreciation and amortization 43 38 100
Asset impairment charges (reversals) (Note 7) 0 0 0
Taxes, other than income taxes 1 1 1
Profit (loss) from operating activities 0 (9) (191)
Operating income 44 80 253
Finance lease income 8 11 14
Goodwill (Note 18) 0 0  
Property, plant and equipment (Note 17) 391 416  
Intangible assets (Note 19) 4 3  
Property, plant and equipment expenditures 21 31 11
Purchase of intangible assets 0 0 1
Reportable segments [member] | Australian Gas      
Disclosure of operating segments [line items]      
Revenues 165 135 119
Fuel and purchased power (Note 6) 8 14 20
Gross margin 157 121 99
Operations, maintenance, and administration (Note 5) 37 31 25
Depreciation and amortization 49 37 17
Asset impairment charges (reversals) (Note 7) 0 0 0
Taxes, other than income taxes 0 0 1
Profit (loss) from operating activities 0 0 0
Operating income 71 53 56
Finance lease income 0 43 52
Goodwill (Note 18) 0 0  
Property, plant and equipment (Note 17) 554 606  
Intangible assets (Note 19) 41 42  
Property, plant and equipment expenditures 6 114 107
Purchase of intangible assets 0 29 0
Reportable segments [member] | Wind and Solar      
Disclosure of operating segments [line items]      
Revenues 282 287 272
Fuel and purchased power (Note 6) 17 17 18
Gross margin 265 270 254
Operations, maintenance, and administration (Note 5) 50 48 52
Depreciation and amortization 110 111 119
Asset impairment charges (reversals) (Note 7) 12 0 28
Taxes, other than income taxes 8 8 8
Profit (loss) from operating activities (6) 0 (1)
Operating income 91 103 48
Finance lease income 0 0 0
Goodwill (Note 18) 175 174  
Property, plant and equipment (Note 17) 1,799 1,764  
Intangible assets (Note 19) 173 149  
Property, plant and equipment expenditures 117 20 16
Purchase of intangible assets 0 0 0
Reportable segments [member] | Hydro      
Disclosure of operating segments [line items]      
Revenues 156 121 126
Fuel and purchased power (Note 6) 6 6 8
Gross margin 150 115 118
Operations, maintenance, and administration (Note 5) 38 37 33
Depreciation and amortization 30 31 33
Asset impairment charges (reversals) (Note 7) 0 0 0
Taxes, other than income taxes 3 3 3
Profit (loss) from operating activities 0 0 0
Operating income 79 44 49
Finance lease income 0 0 0
Goodwill (Note 18) 259 259  
Property, plant and equipment (Note 17) 481 497  
Intangible assets (Note 19) 4 3  
Property, plant and equipment expenditures 16 16 43
Purchase of intangible assets 0 0 0
Reportable segments [member] | Energy Marketing      
Disclosure of operating segments [line items]      
Revenues 67 69 76
Fuel and purchased power (Note 6) 0 0 0
Gross margin 67 69 76
Operations, maintenance, and administration (Note 5) 24 24 24
Depreciation and amortization 2 2 3
Asset impairment charges (reversals) (Note 7) 0 0 0
Taxes, other than income taxes 0 0 0
Profit (loss) from operating activities 0 0 0
Operating income 41 43 49
Finance lease income 0 0 0
Goodwill (Note 18) 30 30  
Property, plant and equipment (Note 17) 1 1  
Intangible assets (Note 19) 11 13  
Property, plant and equipment expenditures 0 0 0
Purchase of intangible assets 0 0 0
Reportable segments [member] | Corporate      
Disclosure of operating segments [line items]      
Revenues (7) 0 0
Fuel and purchased power (Note 6) (7) 0 0
Gross margin 0 0 0
Operations, maintenance, and administration (Note 5) 86 84 69
Depreciation and amortization 25 26 26
Asset impairment charges (reversals) (Note 7) 23 0 0
Taxes, other than income taxes 1 1 1
Profit (loss) from operating activities 0 0 1
Operating income (135) (111) (97)
Finance lease income 0 0 0
Goodwill (Note 18) 0 0  
Property, plant and equipment (Note 17) 19 22  
Intangible assets (Note 19) 52 56  
Property, plant and equipment expenditures 2 6 7
Purchase of intangible assets $ 17 $ 16 $ 16