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Net realized and unrealized gains and losses on derivative transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Commodity contracts: [Abstract]
Electricity	$ (17)	$ (130)	$ (187)
Natural Gas	30	357	(388)
Realized And Unrealized Losses Net Commodity Contracts, Foreign Currency	$ (1)	$ (1)	$ 1

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- Definition

Commodity contracts: [Abstract]

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No definition available.

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- Definition

Realized and unrealized gains and losses, net on commodity contracts related to electricity not designated as hedging instruments included in purchased power and fuel expense in the statement of income.

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No definition available.

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- Definition

Realized And Unrealized Gains And Losses Net Commodity Contracts, Foreign Currency

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No definition available.

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- Definition

Realized and unrealized gains and losses, net on commodity contracts related to natural gas not designated as hedging instruments included in purchased power and fuel expense in the statement of income.

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No definition available.

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