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Segment Disclosures Disclosure of operating segments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Revenues $ 2,347 $ 2,249 $ 2,307
Fuel and purchased power (Note 6) 1,086 1,100 1,016
Gross margin 1,261 1,149 1,291
Depreciation and amortization 590 574 635
Asset impairment charges (reversals) (Note 7) 25 73 20
Gains on termination of investments 56 157 0
Taxes, other than income taxes 29 31 30
Finance lease income 6 8 54
Gain on sale of assets and other (Note 4(D) and 17) 46 1 2
Net interest expense (Note 10) (179) (250) (247)
Foreign exchange loss (15) (15) (1)
Earnings (loss) before income taxes 193 (96) (54)
Goodwill 464 464  
Property, plant and equipment 6,207 6,164 6,578
Right-of-use assets 146 0  
Intangible assets 318 373 364
Other assets 198 234  
Property, plant and equipment expenditures 417 277 338
Purchase of intangible assets 14 20 51
Mine depreciation 119 136 73
Adjustments for depreciation and amortisation expense 709 710 708
Canada      
Disclosure of operating segments [line items]      
Revenues 1,460 1,573 1,663
Goodwill 418 417  
Property, plant and equipment 4,854 4,953  
Right-of-use assets 109 0  
Intangible assets 213 273  
Other assets 75 101  
US      
Disclosure of operating segments [line items]      
Revenues 727 511 509
Goodwill 46 47  
Property, plant and equipment 863 657  
Right-of-use assets 33 0  
Intangible assets 68 59  
Other assets 47 50  
Australia      
Disclosure of operating segments [line items]      
Revenues 160 165 135
Goodwill 0 0  
Property, plant and equipment 490 554  
Right-of-use assets 4 0  
Intangible assets 37 41  
Other assets 76 83  
Reportable segments [member]      
Disclosure of operating segments [line items]      
Revenues 2,347 2,249 2,307
Fuel and purchased power (Note 6) 1,086 1,100 1,016
Gross margin 1,261 1,149 1,291
Operations, maintenance, and administration (Note 5) 475 515 517
Depreciation and amortization 590 574 635
Asset impairment charges (reversals) (Note 7) 25 73 20
Gains (losses) on disposals of investments (88)    
Gains on termination of investments 56 157  
Taxes, other than income taxes 29 31 30
Profit (loss) from operating activities (49) (47) (49)
Operating income 335 160 138
Finance lease income 6 8 54
Gain on sale of assets and other (Note 4(D) and 17) 46 1 2
Net interest expense (Note 10) (179) (250) (247)
Foreign exchange loss (15) (15) (1)
Earnings (loss) before income taxes 193 (96) (54)
Goodwill 464 464  
Property, plant and equipment 6,207 6,164  
Right-of-use assets 146    
Intangible assets 318 373  
Property, plant and equipment expenditures 417 277 338
Purchase of intangible assets 14 20 51
Reportable segments [member] | Canadian Coal      
Disclosure of operating segments [line items]      
Revenues 816 912 999
Fuel and purchased power (Note 6) 570 666 585
Gross margin 246 246 414
Operations, maintenance, and administration (Note 5) 138 171 192
Depreciation and amortization 233 241 317
Asset impairment charges (reversals) (Note 7) 15 38 20
Gains (losses) on disposals of investments (88)    
Gains on termination of investments 56 157  
Taxes, other than income taxes 13 13 13
Profit (loss) from operating activities (40) (41) (40)
Operating income 31 (19) (88)
Finance lease income 0 0 0
Goodwill 0 0  
Property, plant and equipment 2,540 2,587  
Right-of-use assets 68    
Intangible assets 41 81  
Property, plant and equipment expenditures 114 101 116
Purchase of intangible assets 2 3 5
Reportable segments [member] | United States Coal      
Disclosure of operating segments [line items]      
Revenues 571 442 435
Fuel and purchased power (Note 6) 416 314 293
Gross margin 155 128 142
Operations, maintenance, and administration (Note 5) 67 61 51
Depreciation and amortization 83 74 73
Asset impairment charges (reversals) (Note 7) (10) 0 0
Gains (losses) on disposals of investments 0    
Gains on termination of investments 0 0  
Taxes, other than income taxes 3 5 4
Profit (loss) from operating activities 0 0 0
Operating income 12 (12) 14
Finance lease income 0 0 0
Goodwill 0 0  
Property, plant and equipment 352 332  
Right-of-use assets 0    
Intangible assets 6 7  
Property, plant and equipment expenditures 8 14 35
Purchase of intangible assets 0 0 1
Reportable segments [member] | Canadian Gas      
Disclosure of operating segments [line items]      
Revenues 209 232 261
Fuel and purchased power (Note 6) 74 96 101
Gross margin 135 136 160
Operations, maintenance, and administration (Note 5) 44 48 50
Depreciation and amortization 41 43 38
Asset impairment charges (reversals) (Note 7) 0 0 0
Gains (losses) on disposals of investments 0    
Gains on termination of investments 0 0  
Taxes, other than income taxes 1 1 1
Profit (loss) from operating activities (1) 0 (9)
Operating income 50 44 80
Finance lease income 6 8 11
Goodwill 0 0  
Property, plant and equipment 392 391  
Right-of-use assets 0    
Intangible assets 2 4  
Property, plant and equipment expenditures 36 21 31
Purchase of intangible assets 0 0 0
Reportable segments [member] | Australian Gas      
Disclosure of operating segments [line items]      
Revenues 160 165 135
Fuel and purchased power (Note 6) 9 8 14
Gross margin 151 157 121
Operations, maintenance, and administration (Note 5) 37 37 31
Depreciation and amortization 48 49 37
Asset impairment charges (reversals) (Note 7) 0 0 0
Gains (losses) on disposals of investments 0    
Gains on termination of investments 0 0  
Taxes, other than income taxes 0 0 0
Profit (loss) from operating activities 0 0 0
Operating income 66 71 53
Finance lease income 0 0 43
Goodwill 0 0  
Property, plant and equipment 489 554  
Right-of-use assets 4    
Intangible assets 37 41  
Property, plant and equipment expenditures 6 6 114
Purchase of intangible assets 0 0 29
Reportable segments [member] | Wind and Solar      
Disclosure of operating segments [line items]      
Revenues 312 282 287
Fuel and purchased power (Note 6) 16 17 17
Gross margin 296 265 270
Operations, maintenance, and administration (Note 5) 50 50 48
Depreciation and amortization 124 110 111
Asset impairment charges (reversals) (Note 7) 0 12 0
Gains (losses) on disposals of investments 0    
Gains on termination of investments 0 0  
Taxes, other than income taxes 8 8 8
Profit (loss) from operating activities (10) (6) 0
Operating income 124 91 103
Finance lease income 0 0 0
Goodwill 176 175  
Property, plant and equipment 1,947 1,799  
Right-of-use assets 56    
Intangible assets 173 173  
Property, plant and equipment expenditures 229 117 20
Purchase of intangible assets 0 0 0
Reportable segments [member] | Hydro      
Disclosure of operating segments [line items]      
Revenues 156 156 121
Fuel and purchased power (Note 6) 7 6 6
Gross margin 149 150 115
Operations, maintenance, and administration (Note 5) 36 38 37
Depreciation and amortization 32 30 31
Asset impairment charges (reversals) (Note 7) 2 0 0
Gains (losses) on disposals of investments 0    
Gains on termination of investments 0 0  
Taxes, other than income taxes 3 3 3
Profit (loss) from operating activities 0 0 0
Operating income 76 79 44
Finance lease income 0 0 0
Goodwill 258 259  
Property, plant and equipment 469 481  
Right-of-use assets 6    
Intangible assets 5 4  
Property, plant and equipment expenditures 23 16 16
Purchase of intangible assets 0 0 0
Reportable segments [member] | Energy Marketing      
Disclosure of operating segments [line items]      
Revenues 129 67 69
Fuel and purchased power (Note 6) 0 0 0
Gross margin 129 67 69
Operations, maintenance, and administration (Note 5) 30 24 24
Depreciation and amortization 2 2 2
Asset impairment charges (reversals) (Note 7) 0 0 0
Gains (losses) on disposals of investments 0    
Gains on termination of investments 0 0  
Taxes, other than income taxes 0 0 0
Profit (loss) from operating activities 0 0 0
Operating income 97 41 43
Finance lease income 0 0 0
Goodwill 30 30  
Property, plant and equipment 1 1  
Right-of-use assets 0    
Intangible assets 9 11  
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 (6) (7) 0
Fuel and purchased power (Note 6) (6) (7) 0
Gross margin 0 0 0
Operations, maintenance, and administration (Note 5) 73 86 84
Depreciation and amortization 27 25 26
Asset impairment charges (reversals) (Note 7) 18 23 0
Gains (losses) on disposals of investments 0    
Gains on termination of investments 0 0  
Taxes, other than income taxes 1 1 1
Profit (loss) from operating activities 2 0 0
Operating income (121) (135) (111)
Finance lease income 0 0 0
Goodwill 0 0  
Property, plant and equipment 17 19  
Right-of-use assets 12    
Intangible assets 45 52  
Property, plant and equipment expenditures 1 2 6
Purchase of intangible assets $ 12 $ 17 $ 16