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Revenue (Tables) | 12 Months Ended
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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, 2021 | Hydro | Wind and Solar | Gas(1) | Energy Transition(2) | Energy Marketing | Corporate and Other | Total
Revenues from contracts with customers |  |  |  |  |  |  |
Power and other(3) | 28 |  | 207 |  | 395 |  | 24 |  | — |  | — |  | 654 |
Environmental attributes | — |  | 28 |  | — |  | — |  | — |  | — |  | 28 |
Revenue from contracts with customers | 28 |  | 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 revenue | 383 |  | 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 time | 28 |  | 207 |  | 393 |  | 1 |  | — |  | — |  | 629 |
Total revenue from contracts with customers | 28 |  | 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, 2020 | Hydro | Wind and Solar | Gas(1) | Energy Transition(2) | Energy Marketing | Corporate and Other | Total
Revenues from contracts with customers |  |  |  |  |  |  |
Power and other | 141 |  | 238 |  | 465 |  | 156 |  | — |  | — |  | 1,000 |
Environmental attributes | — |  | 23 |  | — |  | — |  | — |  | — |  | 23 |
Revenue from contracts with customers | 141 |  | 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 revenue | 152 |  | 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 time | 141 |  | 236 |  | 458 |  | 130 |  | — |  | — |  | 965 |
Total revenue from contracts with customers | 141 |  | 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, 2019 | Hydro | Wind and Solar | Gas(1) | Energy Transition(2) | Energy Marketing | Corporate and Other | Total
Revenues from contracts with customers |  |  |  |  |  |  |
Power and other | 142 |  | 221 |  | 497 |  | 185 |  | — |  | — |  | 1,045 |
Environmental attributes | — |  | 23 |  | — |  | — |  | — |  | — |  | 23 |
Revenue from contracts with customers | 142 |  | 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 revenue | 156 |  | 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 time | 142 |  | 217 |  | 492 |  | 139 |  | — |  | — |  | 990 |
Total revenue from contracts with customers | 142 |  | 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 liabilities | 2021 | 2020
Balance, beginning of the year | 15 |  | 15 |
Amounts transferred to revenue included in opening balance | (1) |  | (1) |
Consideration received | 8 |  | 1 |
Increases due to amounts billed to customers | — |  | 2 |
Changes in transaction price | 11 |  | — |
Performance obligations satisfied | (1) |  | (2) |
Balance, end of year | 32 |  | 15 |
Current portion | 19 |  | 1 |
Long-term portion | 13 |  | 14 |

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