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Revenue (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of revenue from contracts with customers [Abstract]  
Disaggregation Of Revenue
The majority of the Corporation'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 Corporation disaggregates into the following groups for the purpose of determining how economic factors affect the recognition of revenue.
Year ended Dec. 31, 2020HydroWind
and
Solar
North American
Gas(1)
Australian
Gas
Alberta Thermal(2)
Centralia(2)
Energy
Marketing		Corporate and OtherTotal
Revenues from contracts with
customers		141 261 196 90 325 10 — — 1,023 
Revenue from leases(3)
— — 8 60 55 — — — 123 
Revenue from derivatives and
other trading activities		— (2)4 — (12)283 122 12 407 
Government incentives1 4 — — — — — — 5 
Revenue from other(4)
10 66 9 8 251 204 — (5)543 
Total revenue152 329 217 158 619 497 122 7 2,101 
Revenues from contracts with customers
Timing of revenue recognition
   At a point in time— 25 — — 23 10 — — 58 
   Over time141 236 196 90 302 — — — 965 
Total revenue from contracts
with customers		141 261 196 90 325 10 — — 1,023 
(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. In addition, during the third quarter of 2020, merchant revenue within this segment was reclassified from revenue from contracts with customers to revenue from other and prior periods were adjusted.
(2) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020.
(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 and other miscellaneous.

Year ended Dec. 31, 2019HydroWind
and
Solar
North American
Gas(1)
Australian
Gas
Alberta Thermal(2)
Centralia(2)
Energy
Marketing		Corporate and OtherTotal
Revenues from contracts with
customers		142 244 190 87 395 10 — — 1,068 
Revenue from leases(3)
— — — 65 65 — — — 130 
Revenue from derivatives and
other trading activities		— 18 2 — (17)160 129 4 296 
Government incentives— 8 — — — — — — 8 
Revenue from other(4)
14 42 17 8 373 401 — (10)845 
Total revenue156 312 209 160 816 571 129 (6)2,347 
Revenues from contracts with customers
Timing of revenue recognition
   At a point in time— 27 — — 41 10 — — 78 
   Over time142 217 190 87 354 — — — 990 
Total revenue from contracts with customers142 244 190 87 395 10 — — 1,068 
(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. In addition, during the third quarter of 2020, merchant revenue within this segment was reclassified from revenue from contracts with customers to revenue from other and prior periods were adjusted.
(2) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020.
(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 and other miscellaneous.
Year ended Dec. 31, 2018HydroWind and
Solar
North American Gas(1)
Australian
Gas
Alberta Thermal(2)
Centralia(2)
Energy
Marketing		CorporateTotal
Revenues from contracts with
customers		132 206 206 91 517 9 — — 1,161 
Revenue from leases(3)
7 27 — 68 68 — — — 170 
Revenue from derivatives and
other trading activities		— (20)4 — (1)115 67 — 165 
Government incentives— 16 — — — — — — 16 
Revenue from other(4)
17 53 22 6 328 318 — (7)737 
Total revenue156 282 232 165 912 442 67 (7)2,249 
Revenues from contracts with customers
Timing of revenue recognition
   At a point in time— 18 — — 38 9 — — 65 
   Over time132 188 206 91 479 — — — 1,096 
Total revenue from contracts with customers132 206 206 91 517 9 — — 1,161 
(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. In addition, during the third quarter of 2020, merchant revenue within this segment was reclassified from revenue from contracts with customers to revenue from other and prior periods were adjusted.
(2) The Canadian Coal segment was renamed Alberta Thermal and the US Coal segment was renamed Centralia in the third quarter of 2020.
(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 and other miscellaneous.
Changes In Contract Liabilities
The Corporation has recognized the following revenue-related contract liabilities:
Contract liabilities20202019
Balance, beginning of the year15 88 
IFRS 16 transition adjustments(1)
— 15 
Amounts transferred to revenue included in opening balance(1)(10)
Consideration received1 5 
Increases due to interest accrued and expensed during the period— 5 
Contract termination associated with the purchase of Keephills 3 (Note 4(R))
— (88)
Consideration paid2 — 
Performance obligations satisfied(2)— 
Balance, end of year15 15 
Current portion1 1 
Long-term portion14 14 
(1) In 2019, on transition to IFRS 16, some contracts that were previously considered leases under IAS 17 did not meet the definition of a lease under IFRS 16 and therefore were assessed under IFRS 15 and balances were transferred from deferred revenue to contract liabilities.