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Accounting for Derivative Instruments and Hedging Activities - Volume Buy/Sell of Company's Open Derivative Transactions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) BTU MWh	Dec. 31, 2023 USD ($) MWh BTU
Long | Interest
Derivative [Line Items]
Notional amount | $	$ 1,769	$ 2,467
Commodity Contracts | Short | Power
Derivative [Line Items]
Notional amount, energy measure | MWh	25	23
Commodity Contracts | Short | Natural Gas
Derivative [Line Items]
Notional amount, energy measure | BTU	11	17

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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+ References

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

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