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Segment Disclosures (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of operating segments [abstract]  
Disclosure of operating segments
Year ended Dec. 31, 2021Hydro
Wind & Solar(1)
Gas(2)
Energy Transition(3)
Energy
Marketing		CorporateTotal
Equity investments(1)
Reclass adjustmentsIFRS financials
Revenues383 323 1,109 709 211 4 2,739 (18)— 2,721 
Reclassifications and adjustments:
Unrealized mark-to-market (gain) loss— 25 (40)19 (38)— (34)— 34 — 
Decrease in finance lease receivable— — 41 — — — 41 — (41)— 
Finance lease income— — 25 — — — 25 — (25)— 
Unrealized foreign exchange gain on commodity— — (3)— — — (3)— 3 — 
Adjusted revenues383 348 1,132 728 173 4 2,768 (18)(29)2,721 
Fuel and purchased power16 17 457 560 — 4 1,054 — — 1,054 
Reclassifications and adjustments:
Australian interest income— — (4)— — — (4)— 4 — 
Mine depreciation— — (79)(111)— — (190)— 190 — 
Coal inventory write-down— — — (17)— — (17)— 17 — 
Adjusted fuel and purchased power16 17 374 432 — 4 843 — 211 1,054 
Carbon compliance(4)
— — 118 60 — — 178 — — 178 
Gross margin367 331 640 236 173 — 1,747 (18)(240)1,489 
OM&A42 59 175 117 36 84 513 (2)— 511 
Reclassifications and adjustments:
Parts and materials write-down— — (2)(26)— — (28)— 28 — 
Curtailment gain— — — 6 — — 6 — (6)— 
Adjusted OM&A42 59 173 97 36 84 491 (2)22 511 
Taxes, other than income taxes3 10 13 6 — 1 33 (1)— 32 
Net other operating expense (income)— — (40)48 — — 8 — — 8 
Reclassifications and adjustments:
Royalty onerous contract and contract termination penalties— — — (48)— — (48)— 48 — 
Adjusted net other operating income— — (40)— — — (40)— 48 8 
Adjusted EBITDA322 262 494 133 137 (85)1,263 
Equity income from associate9 
Finance lease income
25 
Depreciation and amortization(529)
Asset impairment(648)
Net interest expense(6)
(245)
Foreign exchange gain
16 
Gain on sale of assets and other54 
Loss before income taxes
(380)
(1) Skookumchuck has been included on a proportionate basis in the Wind and Solar segment.
(2) Includes the segments previously known as Australian Gas and North American Gas and the gas generation assets from the segment previously known as Alberta Thermal.
(3) Includes the segment previously known as Centralia and the coal generation assets from the segment previously known as Alberta Thermal.
(4) As of the first quarter of 2021, carbon compliance costs have been reclassified from fuel and purchase power costs and disclosed separately. Prior periods have been adjusted for comparative purposes.
(5) Adjusted EBITDA is not defined and has no standardized meaning under IFRS.
(6) Includes accretion by segment and interest expense is not allocated as its related to Corporate debt and borrowings.
Year ended Dec. 31, 2020 Hydro
Wind & Solar(1)
Gas(2)
Energy Transition(3)
Energy
Marketing		CorporateTotal
Equity accounted investments(1)
Reclass adjustmentsIFRS financials
Revenues152 332 787 704 122 7 2,104 (3)— 2,101 
Reclassifications and adjustments:
Unrealized mark-to-market (gain) loss— 2 33 (14)21 — 42 — (42)— 
Decrease in finance lease receivable— — 17 — — — 17 — (17)— 
Finance lease income— — 7 — — — 7 — (7)— 
Unrealized foreign exchange loss on commodity— — 4 — — — 4 — (4)— 
Adjusted revenues152 334 848 690 143 7 2,174 (3)(70)2,101 
Fuel and purchased power8 25 325 435 — 12 805 — — 805 
Reclassifications and adjustments:
Australian interest income— — (4)— — — (4)— 4 — 
Mine depreciation— — (100)(46)— — (146)— 146 — 
Coal inventory write-down— — — (37)— — (37)— 37 — 
Adjusted fuel and purchased
  power		8 25 221 352 — 12 618 — 187 805 
Carbon compliance(4)
— — 120 48 — (5)163 — — 163 
Gross margin144 309 507 290 143 — 1,393 (3)(257)1,133 
OM&A37 53 166 106 30 80 472 — — 472 
Taxes, other than income taxes2 8 13 9 — 1 33 — — 33 
Net other operating expense (income)— — (11)— — — (11)— — (11)
Reclassifications and adjustments:
Impact of Sheerness going off-coal— — (28)— — — (28)— 28 — 
Adjusted net other operating income(39)— — — (39)— 28 (11)
Adjusted EBITDA(5)
105 248 367 175 113 (81)927 
Equity income from associate1 
Finance lease income7 
Depreciation and amortization(654)
Asset impairment(84)
Net interest expense(6)
(238)
Foreign exchange loss17 
Gain on sale of assets and other9 
Loss before income taxes(303)
(1) Skookumchuck has been included on a proportionate basis in the Wind and Solar segment.
(2) Includes the segments previously known as Australian Gas and North American Gas and the gas generation assets from the segment previously known as Alberta Thermal.
(3) Includes the segment previously known as Centralia and the coal generation assets from the segment previously known as Alberta Thermal.
(4) As of the first quarter of 2021, carbon compliance costs have been reclassified from fuel and purchase power costs and disclosed separately. Prior periods have been adjusted for comparative purposes.
(5) Adjusted EBITDA is not defined and has no standardized meaning under IFRS.
(6) Includes accretion by segment and interest expense is not allocated as its related to Corporate debt and borrowings.
Year ended Dec. 31, 2019 HydroWind & Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		CorporateTotalReclass adjustmentsIFRS financials
Revenues156 312 851 905 129 (6)2,347 — 2,347 
Reclassifications and adjustments:
Unrealized mark-to-market (gain) loss— (17)6 (12)(10)— (33)33 — 
Decrease in finance lease receivable— — 24 — — — 24 (24)— 
Finance lease income— — 6 — — — 6 (6)— 
Adjusted revenues156 295 887 893 119 (6)2,344 3 2,347 
Fuel and purchased power7 16 315 539 — 4 881 — 881 
Reclassifications and adjustments:
Australian interest income— — (4)— — — (4)4 — 
Mine depreciation— — (81)(40)— — (121)121 — 
Adjusted fuel and purchased power7 16 230 499 — 4 756 125 881 
Carbon compliance— — 138 77 — (10)205 — 205 
Gross margin149 279 519 317 119 — 1,383 (122)1,261 
OM&A36 50 162 124 30 73 475 — 475 
Taxes, other than income taxes3 8 9 8 — 1 29 — 29 
Net other operating expense (income)— (10)(41)— — 2 (49)— (49)
Termination of Sundance B and C PPAs— — (14)(42)— — (56)— (56)
Adjusted EBITDA(3)
110 231 403 227 89 (76)984 
Finance lease income6 
Depreciation and amortization(590)
Asset impairment(25)
Gain on termination of Keephills 3 coal rights contract88 
Net interest expense(4)
(179)
Foreign exchange loss(15)
Gain on sale of assets and other46 
Earnings before income taxes193 
(1) Includes the segments previously known as Australian Gas and North American Gas and the gas generation assets from the segment previously known as Alberta Thermal.
(2) Includes the segment previously known as Centralia and the coal generation assets from the segment previously known as Alberta Thermal.
(3) Adjusted EBITDA is not defined and has no standardized meaning under IFRS.
(4) Includes accretion by segment and interest expense is not allocated as its related to Corporate debt and borrowings.
Disclosure of selected consolidated statements of financial position information Selected Consolidated Statements of Financial Position Information
As at Dec. 31, 2021HydroWind
and
Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		CorporateTotal
PP&E466 2,304 2,036 481 — 33 5,320 
Right-of-use assets5 64 7 1 — 18 95 
Intangible assets3 147 56 9 5 36 256 
Goodwill258 175 — — 30 — 463 
As at Dec. 31, 2020HydroWind
and
Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		CorporateTotal
PP&E467 2,005 2,102 1,232 — 16 5,822 
Right-of-use assets6 55 5 53 — 22 141 
Intangible assets4 159 66 36 7 41 313 
Goodwill258 175 — — 30 — 463 
(1) Includes the segments previously known as Australian Gas and North American Gas and the gas generation assets from the segment previously known as Alberta Thermal.
(2) Includes the segment previously known as Centralia and the coal generation assets from the segment previously known as Alberta Thermal.
Disclosure of components in other non-current assets
Additions to non-current assets are as follows:
Year ended Dec. 31, 2021HydroWind
and
Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		CorporateTotal
Additions to non-current assets:     
 PP&E29 166 167 90 — 28 480 
 Intangible assets— — — 1 — 8 9 
Year ended Dec. 31, 2020HydroWind
and
Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		CorporateTotal
Additions to non-current assets:     
 PP&E22 174 199 78 — 13 486 
 Intangible assets— — — 1 — 13 14 
Year ended Dec. 31, 2019HydroWind
and
Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		CorporateTotal
Additions to non-current assets:     
 PP&E23 229 74 90 — 1 417 
 Intangible assets— — — 2 — 12 14 
(1) Includes the segments previously known as Australian Gas and North American Gas and the gas generation assets from the segment previously known as Alberta Thermal.
(2) Includes the segment previously known as Centralia and the coal generation assets from the segment previously known as Alberta Thermal.
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. 31202120202019
Depreciation and amortization expense on the Consolidated Statements of
  Earnings (Loss)		529 654 590 
Depreciation included in fuel, carbon compliance and purchased power (Note 6)190 144 119 
Depreciation and amortization on the Consolidated Statements of Cash Flows719 798 709 
Disclosure of geographical areas Revenues
Year ended Dec. 31202120202019
Canada1,854 1,227 1,460 
US731 716 727 
Australia136 158 160 
Total revenue2,721 2,101 2,347 
II. Non-Current Assets
Property, plant and
equipment		Right-of-use assetsIntangible assetsOther assets
As at Dec. 3120212020202120202021202020212020
Canada4,051 4,661 52 107 141 185 15 74 
US860 737 39 30 85 94 61 61 
Australia409 424 4 4 30 34 66 71 
Total5,320 5,822 95 141 256 313 142 206