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Revenue
 12 Months Ended
Dec. 31, 2023
Disclosure of revenue from contracts with customers [Abstract]  
Revenue Revenue
A. Disaggregation of Revenue
The majority of the Company's revenues are derived from the sale of 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, 2023HydroWind and
Solar		GasEnergy TransitionEnergy
Marketing		CorporateTotal
Revenues from contracts with customers
Power and other
30 190 400 12 — — 632 
Environmental attributes(1)
14 26 — — — — 40 
Revenue from contracts with customers44 216 400 12 — — 672 
Revenue from leases(2)
— — 32 — — — 32 
Revenue from derivatives and other trading activities(3)
44 (2)(172)251 220 — 341 
Revenue from merchant sales434 104 1,247 488 — — 2,273 
Other(4)
11 18 7 — — 1 37 
Total revenue533 336 1,514 751 220 1 3,355 
Revenues from contracts with customers
Timing of revenue recognition
At a point in time
14 26 — 12 — — 52 
Over time
30 190 400 — — — 620 
Total revenue from contracts with customers
44 216 400 12 — — 672 
(1)The environmental attributes represent environmental attribute sales not bundled with power and other sales.
(2)Total lease income from long-term contracts that meet the criteria of operating leases.
(3)Represents realized and unrealized gains or losses from hedging and derivative positions. Volatility and pricing in commodity markets can vary significantly from period to period and impact movements in derivative positions.
(4) Other revenue includes production tax credits related to US wind facilities and other miscellaneous revenues.
Year ended Dec. 31, 2022HydroWind and
Solar		GasEnergy TransitionEnergy
Marketing		Corporate Total
Revenues from contracts with customers
Power and other
33 220 462 10 — — 725 
Environmental attributes(1)
1 50 — — — — 51 
Revenue from contracts with customers34 270 462 10 — — 776 
Revenue from leases(2)
— — 32 — — — 32 
Revenue from derivatives and other trading activities(3)
— (121)(821)243 160 (2)(541)
Revenue from merchant sales564 119 1,529 461 — — 2,673 
Other(4)
8 21 7 — — — 36 
Total revenue606 289 1,209 714 160 (2)2,976 
Revenues from contracts with customers
Timing of revenue recognition
At a point in time
1 50 — 12 — — 63 
Over time
33 220 462 (2)— — 713 
Total revenue from contracts with customers34 270 462 10 — — 776 
(1)The environmental attributes represent environmental attribute sales not bundled with power and other sales.
(2)Total lease income from long-term contracts that meet the criteria of operating leases.
(3)Represents realized and unrealized gains or losses from hedging and derivative positions. Volatility and pricing in commodity markets can vary significantly from period to period and impact movements in derivative positions.
(4)Other revenue includes production tax credits related to US wind facilities and other miscellaneous revenues.
Year ended Dec. 31, 2021HydroWind and
Solar		GasEnergy TransitionEnergy
Marketing		Corporate Total
Revenues from contracts with customers
Power and other
28 207 395 24 — — 654 
Environmental attributes(1)
— 28 — — — — 28 
Revenue from contracts with customers28 235 395 24 — — 682 
Revenue from leases(2)
— — 19 — — — 19 
Revenue from derivatives and other trading activities(3)
— (22)(118)138 211 4 213 
Revenue from merchant sales345 35 808 546 — — 1,734 
Other(4)
10 57 5 1 — — 73 
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 time
28 207 393 1 — — 629 
Total revenue from contracts with customers28 235 395 24 — — 682 
(1)The environmental attributes represent environmental attribute sales not bundled with power and other sales.
(2)Total lease income from long-term contracts that meet the criteria of operating leases.
(3)Represents realized and unrealized gains or losses from hedging and derivative positions. Volatility and pricing in commodity markets can vary significantly from period to period and impact movements in derivative positions.
(4)Other revenue includes production tax credits related to US wind facilities and other miscellaneous revenues.
B. Performance Obligations
The performance obligations in the Company's contracts with its customers include the provision of electricity and steam capacity; the delivery of electricity, thermal energy and environmental attributes; the provision of operation and maintenance services and water management services; and the supply of byproducts from coal generation.
The aggregate amount of transaction prices allocated to remaining performance obligations (contract revenues that have not yet been recognized) as at Dec. 31, 2023, is approximately $2,700 million, with approximately $510 million expected to be recognized during the period 2024-2026; $505 million for the period of 2027-2029; $725 million for the period of 2030-2034; and $960 million for 2035 and thereafter.
These amounts exclude revenues related to contracts that qualify for the invoice practical expedient and future revenues that are related to constrained variable consideration. In many of the Company’s contracts, elements of the transaction price are considered constrained, such as for variable revenues dependent upon future production volumes that are driven by customer or market demand or market prices that are subject to factors outside the Company’s influence. As a result, the amounts of future revenues disclosed above represent only a portion of future revenues that are expected to be realized by the Company from its contractual portfolio.