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Revenue (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of revenue from contracts with customers [Abstract]  
Disaggregation Of Revenue
The majority of the Company's revenues are derived from the sale of physical power, capacity and environmental attributes, leasing of power facilities, and from asset optimization activities, which the Company disaggregates into the following groups for the purpose of determining how economic factors affect the recognition of revenue.
Year ended Dec. 31, 2021HydroWind and
Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		Corporate and OtherTotal
Revenues from contracts with customers
  Power and other(3)
28 207 395 24 — — 654 
  Environmental attributes— 28 — — — — 28 
Revenue from contracts with customers28 235 395 24 — — 682 
Revenue from leases(4)
— — 19 — — — 19 
Revenue from derivatives and other
   trading activities		— (25)(118)138 211 4 210 
Merchant revenue and other(3)(5)
355 95 813 547 — — 1,810 
Total revenue383 305 1,109 709 211 4 2,721 
Revenues from contracts with customers
Timing of revenue recognition
   At a point in time— 28 2 23 — — 53 
   Over time28 207 393 1 — — 629 
Total revenue from contracts with customers28 235 395 24 — — 682 
(1) This segment 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. Refer to Note 1 for further details.
(2) This segment includes the segment previously known as Centralia and the facilities not converted to gas previously in the Alberta Thermal. Refer to Note 1 for further details.
(3) The Alberta PPAs for certain facilities included in the Hydro, Gas and Energy Transition segments with the Balancing Pool expired at Dec. 31, 2020. These facilities began operating on a merchant basis in the Alberta market on Jan. 1, 2021.
(4) Total rental income, including contingent rent related to certain PPAs and other long-term contracts that meet the criteria of operating leases.
(5) Includes merchant revenue, government incentives and other miscellaneous.
Year ended Dec. 31, 2020HydroWind and
Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		Corporate and OtherTotal
Revenues from contracts with customers
  Power and other141 238 465 156 — — 1,000 
  Environmental attributes— 23 — — — — 23 
Revenue from contracts with customers141 261 465 156 — — 1,023 
Revenue from leases(3)
— — 123 — — — 123 
Revenue from derivatives and
   other trading activities		— (2)(8)283 122 12 407 
Merchant revenue and other(4)
11 70 207 265 — (5)548 
Total revenue152 329 787 704 122 7 2,101 
Revenues from contracts with customers
Timing of revenue recognition
   At a point in time— 25 7 26 — — 58 
   Over time141 236 458 130 — — 965 
Total revenue from contracts with customers141 261 465 156 — — 1,023 
(1) This segment 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. Refer to Note 1 for further details.
(2) This segment includes the segment previously known as Centralia and the facilities not converted to gas previously in the Alberta Thermal. Refer to Note 1 for further details.
(3) Total rental income, including contingent rent related to certain PPAs and other long-term contracts that meet the criteria of operating leases.
(4) Includes merchant revenue, government incentives and other miscellaneous.
Year ended Dec. 31, 2019HydroWind and
Solar
Gas(1)
Energy Transition(2)
Energy
Marketing		Corporate and OtherTotal
Revenues from contracts with customers
  Power and other142 221 497 185 — — 1,045 
  Environmental attributes— 23 — — — — 23 
Revenue from contracts with customers142 244 497 185 — — 1,068 
Revenue from leases(3)
— — 130 — — — 130 
Revenue from derivatives and
   other trading activities		— 18 (15)160 129 4 296 
Merchant revenue and other(4)
14 50 239 560 — (10)853 
Total revenue156 312 851 905 129 (6)2,347 
Revenues from contracts with customers
Timing of revenue recognition
   At a point in time— 27 5 46 — — 78 
   Over time142 217 492 139 — — 990 
Total revenue from contracts with customers142 244 497 185 — — 1,068 
(1) This segment 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. Refer to Note 1 for further details.
(2) This segment includes the segment previously known as Centralia and the facilities not converted to gas previously in the Alberta Thermal. Refer to Note 1 for further details.
(3) Total rental income, including contingent rent related to certain PPAs and other long-term contracts that meet the criteria of operating leases.
(4) Includes merchant revenue, government incentives and other miscellaneous.
Changes In Contract Liabilities The Company has recognized the following revenue-related contract liabilities:
Contract liabilities20212020
Balance, beginning of the year15 15 
Amounts transferred to revenue included in opening balance(1)(1)
Consideration received8 1 
Increases due to amounts billed to customers— 2 
Changes in transaction price11 — 
Performance obligations satisfied(1)(2)
Balance, end of year32 15 
Current portion19 1 
Long-term portion13 14