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Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) - Level 3 $ in Millions	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Cash collateral received	$ 288	$ 462
Economic Hedges
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mark-to-market derivatives—Economic hedges	$ (82)	$ 407
Economic Hedges | Minimum | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Forward power price	4.28	9.64
Forward gas price	1.07	1.20
Economic Hedges | Minimum | Option Model
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Volatility percentage	0.11	0.23
Economic Hedges | Maximum | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Forward power price	138	216
Forward gas price	13	14
Economic Hedges | Maximum | Option Model
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Volatility percentage	0.75	2
Economic Hedges | Average | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Forward power price	47	48
Forward gas price	3.41	3.09
Economic Hedges | Average | Option Model
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Volatility percentage	0.45	0.87

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- Definition

Cash collateral received related to credit risk.

+ References

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- Definition

This element represents the forward power market price used to calculate the change in fair value of the derivative instrument.

+ References

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This element represents the forward power market price used to calculate the change in fair value of the derivative instrument.

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- Definition

Value of input used to measure net derivative asset (liability).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Definition

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 9
-SubTopic 20
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-9

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483466/210-20-50-3

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8

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