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Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) - Level 3 $ in Millions | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Cash collateral received | $ 203 | $ 136
Economic Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Mark-to-market derivatives—Economic hedges | $ (221) | $ (137)
Economic Hedges | Minimum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Forward power price | 2.37 | 2.57
Forward gas price | (0.14) | 2.09
Economic Hedges | Minimum | Option Model |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Volatility percentage | 0.17 | 0.23
Economic Hedges | Maximum | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Forward power price | 174 | 140
Forward gas price | 14 | 15
Economic Hedges | Maximum | Option Model |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Volatility percentage | 0.91 | 1.41
Economic Hedges | Average | Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Forward power price | 54 | 49
Forward gas price | 4.09 | 3.68
Economic Hedges | Average | Option Model |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Volatility percentage | 0.54 | 0.57

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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 + Details
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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 -Paragraph 3 -Subparagraph (c) -SubTopic 20 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 20 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-10 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 + Details
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