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Segment Disclosures (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of operating segments [abstract]  
Disclosure of operating segments Earnings Information
Year ended Dec. 31, 2020Hydro
Wind
and
Solar(1)
North
American
Gas(2)
Australian
Gas
Alberta
Thermal(3)
Centralia(3)
Energy
Marketing		CorporateTotal
Equity accounted investments(1)
IFRS Financials
Revenues152 332 217 158 619 497 122 7 2,104 (3)2,101 
Fuel, carbon
compliance and
purchased power		8 25 66 10 573 279 — 7 968 — 968 
Gross margin144 307 151 148 46 218 122 — 1,136 (3)1,133 
Operations,
maintenance and
administration		37 53 49 32 131 60 30 80 472 — 472 
Depreciation and
amortization		28 136 46 43 270 105 2 25 655 (1)654 
Asset impairment 2 — — — 75 7 — — 84 — 84 
Taxes, other than
income taxes		2 8 2 — 15 5 — 1 33 — 33 
Net other operating
expense (income)		— — — — (11)— — — (11)— (11)
Operating income
(loss)		75 110 54 73 (434)41 90 (106)(97)(2)(99)
Equity income from associate(1)
— — — — — — — — — 1 1 
Finance lease income— — 5 2 — — — — 7 — 7 
Net interest expense(239)1 (238)
Foreign exchange
loss		17 — 17 
Gain on sale of assets
and other		9 — 9 
Earnings before
income taxes		(303)— (303)
(1) Skookumchuck has been included on a proportionate basis in the Wind and Solar segment.
(2) This segment was previously known as the Canadian Gas segment but renamed with the acquisition of the US cogeneration facility in the second quarter of 2020. Refer to Note 4(K) for further details.
(3) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020.
Year ended Dec. 31, 2019HydroWind
and
Solar
North
American
Gas(1)
Australian
Gas
Alberta
Thermal(2)
Centralia(2)
Energy
Marketing		CorporateTotal
Revenues156 312 209 160 816 571 129 (6)2,347 
Fuel, carbon compliance and
purchased power		7 16 74 9 570 416 — (6)1,086 
Gross margin149 296 135 151 246 155 129 — 1,261 
Operations, maintenance and
administration		36 50 44 37 138 67 30 73 475 
Depreciation and amortization32 124 41 48 233 83 2 27 590 
Asset impairment (reversal)2 — — — 15 (10)— 18 25 
Gain on termination of
   Keephills 3 coal rights
   contract (Note 4(R))
— — — — (88)— — — (88)
Taxes, other than income taxes3 8 1 — 13 3 — 1 29 
Termination of Sundance B and
   C PPAs (Note 9)
— — — — (56)— — — (56)
Net other operating expense
(income)		— (10)(1)— (40)— — 2 (49)
Operating income (loss)76 124 50 66 31 12 97 (121)335 
Finance lease income— — 6 — — — — — 6 
Net interest expense        (179)
Foreign exchange loss        (15)
Gain on sale of assets and
other		46 
Earnings before income taxes        193 
(1) This segment was previously known as the Canadian Gas segment but renamed with the acquisition of the US cogeneration facility in the second quarter of 2020. Refer to Note 4(K) for further details.
(2) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020.
Year ended Dec. 31, 2018HydroWind
and
Solar
North
American
Gas(1)
Australian
Gas
Alberta
Thermal(2)
Centralia(2)
Energy
Marketing		CorporateTotal
Revenues156 282 232 165 912 442 67 (7)2,249 
Fuel, carbon compliance and
purchased power		6 17 96 8 666 314 — (7)1,100 
Gross margin150 265 136 157 246 128 67 — 1,149 
Operations, maintenance and
administration		38 50 48 37 171 61 24 86 515 
Depreciation and amortization30 110 43 49 241 74 2 25 574 
Asset impairment— 12 — — 38 — — 23 73 
Taxes, other than income taxes3 8 1 — 13 5 — 1 31 
Termination of Sundance B and
   C PPAs (Note 9)
— — — — (157)— — — (157)
Net other operating income— (6)— — (41)— — — (47)
Operating income (loss)79 91 44 71 (19)(12)41 (135)160 
Finance lease income— — 8 — — — — — 8 
Net interest expense        (250)
Foreign exchange loss(15)
Gain on sale of assets1 
Earnings before income taxes        (96)
(1) This segment was previously known as the Canadian Gas segment but renamed with the acquisition of the US cogeneration facility in the second quarter of 2020. Refer to Note 4(K) for further details.
(2) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020.
Disclosure of selected consolidated statements of financial position information Selected Consolidated Statements of Financial Position Information
As at Dec. 31, 2020HydroWind
and
Solar
North
American
Gas(2)
Australian
Gas
Alberta
Thermal(1)
Centralia(1)
Energy
Marketing		CorporateTotal
PP&E467 2,005 382 421 2,271 260 — 16 5,822 
Right-of-use assets6 55 1 4 53 — — 22 141 
Intangible assets4 159 32 34 31 5 7 41 313 
Goodwill258 175 — — — — 30 — 463 
As at Dec. 31, 2019HydroWind
and
Solar
North
American
Gas(2)
Australian
Gas
Alberta
Thermal(1)
Centralia(1)
Energy
Marketing		CorporateTotal
PP&E469 1,947 392 489 2,540 352 1 17 6,207 
Right-of-use assets6 56 — 4 68 — — 12 146 
Intangible assets5 173 2 37 41 6 9 45 318 
Goodwill258 176 — — — — 30 — 464 
(1) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020.
(2) This segment was previously known as the Canadian Gas segment but renamed with the acquisition of the US cogeneration facility in the second quarter of 2020. Refer to Note 4(K) for further details.
Disclosure of components in other non-current assets
Additions to non-current assets are as follows:

Year ended Dec. 31, 2020HydroWind
and
Solar
North
American
Gas(2)
Australian
Gas
Alberta
Thermal(1)
Centralia(1)
Energy
Marketing		CorporateTotal
Additions to non-current assets:         
 PP&E22 174 39 10 200 28 — 13 486 
 Intangible assets— — — — 1 — — 13 14 
Year ended Dec. 31, 2019HydroWind
and
Solar
North
American
Gas(2)
Australian
Gas
Alberta
Thermal(1)
Centralia(1)
Energy
Marketing		CorporateTotal
Additions to non-current assets:         
 PP&E23 229 36 6 114 8 — 1 417 
 Intangible assets— — — — 2 — — 12 14 
Year ended Dec. 31, 2018HydroWind
and
Solar
North
American
Gas(2)
Australian
Gas
Alberta
Thermal(1)
Centralia(1)
Energy
Marketing		CorporateTotal
Additions to non-current assets:         
 PP&E16 117 21 6 101 14 — 2 277 
 Intangible assets— — — — 3 — — 17 20 
(1) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020.
(2) This segment was previously known as the Canadian Gas segment but renamed with the acquisition of the US cogeneration facility in the second quarter of 2020. Refer to Note 4(K) for further details.
Disclosure of reconciliation between depreciation and amortization
The reconciliation between depreciation and amortization reported on the Consolidated Statements of Earnings (Loss) and the Consolidated Statements of Cash Flows is presented below:

Year ended Dec. 31202020192018
Depreciation and amortization expense on the Consolidated Statements of
Earnings (Loss)		654 590 574 
Depreciation included in fuel, carbon compliance and purchased power (Note 6)144 119 136 
Depreciation and amortization on the Consolidated Statements of Cash Flows798 709 710 
Disclosure of geographical areas Revenues
Year ended Dec. 31202020192018
Canada1,227 1,460 1,573 
US716 727 511 
Australia158 160 165 
Total revenue2,101 2,347 2,249 

II. Non-Current Assets
Property, plant and
equipment		Right-of-use assetsIntangible assetsOther assetsGoodwill
As at Dec. 312020201920202019202020192020201920202019
Canada4,661 4,854 107 109 185 213 74 75 418 418 
US737 863 30 33 94 68 61 47 45 46 
Australia424 490 4 4 34 37 71 76 — — 
Total5,822 6,207 141 146 313 318 206 198 463 464