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Revenue (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure of revenue from contracts with customers [Abstract]  
Disclosure of disaggregation of revenue
The majority of the Company's revenues are derived from the sale of power, capacity and environmental and tax 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, 2024
HydroWind and
Solar		GasEnergy TransitionEnergy
Marketing
Corporate(1)
Total
Revenues from contracts with customers
Power and other
36 242 494 12 — — 784 
Environmental and tax attributes(2)
61 77 2 — — (34)106 
Revenue from contracts with customers97 319 496 12 — (34)890 
Revenue from derivatives and other trading activities(3)
16 (69)282 311 168 — 708 
Revenue from merchant sales287 71 546 291 — — 1,195 
Other(4)
9 15 26 2 — — 52 
Total revenue409 336 1,350 616 168 (34)2,845 
Revenues from contracts with customers
Timing of revenue recognition
At a point in time
61 28 — 12 — (34)67 
Over time
36 291 496 — — — 823 
Total revenue from contracts with customers
97 319 496 12 — (34)890 
(1)The elimination of intercompany sales is reflected in the Corporate segment.
(2)The environmental and tax attributes represent environmental attributes and production tax transfer sales not bundled with power and other sales.
(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 U.S. wind facilities subject to tax equity financing arrangements, total lease income from long-term contracts that meet the criteria of operating leases and other miscellaneous revenues.
Year ended Dec. 31, 2023HydroWind and
Solar		GasEnergy TransitionEnergy
Marketing		Corporate Total
Revenues from contracts with customers
Power and other(1)
30 204 400 12 — — 646 
Environmental and tax attributes(2)
14 26 — — — — 40 
Revenue from contracts with customers44 230 400 12 — — 686 
Revenue from derivatives and other trading activities(1)(3)
44 (16)(172)251 220 — 327 
Revenue from merchant sales434 104 1,247 488 — — 2,273 
Other(4)
11 18 39 — — 1 69 
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
30 204 400 — — — 634 
Total revenue from contracts with customers44 230 400 12 — — 686 
(1)In the Wind and Solar segment, $14 million of mark-to-market losses were reclassified from revenue from contracts with customers to revenue from derivatives and other trading activities to conform to the current period presentation.
(2)The environmental and tax attributes represent environmental attributes and production tax transfer sales not bundled with power and other sales.
(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 U.S. wind facilities subject to tax equity financing arrangements, total lease income from long-term contracts that meet the criteria of operating leases and other miscellaneous revenues.
Year ended Dec. 31, 2022
HydroWind and
Solar		GasEnergy TransitionEnergy
Marketing		Corporate Total
Revenues from contracts with customers
Power and other
33 220 462 10 — — 725 
Environmental and tax attributes(1)
1 50 — — — — 51 
Revenue from contracts with customers34 270 462 10 — — 776 
Revenue from derivatives and other trading activities(2)
— (121)(821)243 160 (2)(541)
Revenue from merchant sales564 119 1,529 461 — — 2,673 
Other(3)
8 21 39 — — — 68 
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 and tax attributes represent environmental attributes and production tax transfer sales not bundled with power and other sales.
(2)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.
(3)Other revenue includes production tax credits related to U.S. wind facilities subject to tax equity financing arrangements, total lease income from long-term contracts that meet the criteria of operating leases and other miscellaneous revenues.