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Fair Value of Financial Assets and Liabilities - Fair Value Measurement of Assets and Liabilities, Recurring (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Derivative asset notational amounts | $ 1,068 | $ 948
Variation margin | 606 | 1,712
Cash and Cash Equivalents | Constellation Energy Generation, LLC |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 1,676 | 349
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 1,676 | 349
Cash and Cash Equivalents | CEG Parent |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 142 | 54
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 142 | 54
Restricted cash | Constellation Energy Generation, LLC |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 64 | 49
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 64 | 49
Cash | CEG Parent |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 1 | 2
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 1 | 2
NDT fund investments subtotal |  |
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Net liabilities | 131 | 115
Fair Value, Recurring |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 130 | 42
DPP consideration | 1,766 | 1,216
Deferred compensation obligation | (98) | (69)
Total liabilities measured at fair value | (941) | (1,120)
Total net assets | 20,469 | 19,164
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 130 | 42
Fair Value, Recurring | Mark-to-market derivative liabilities subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (843) | (1,051)
Fair Value, Recurring | Economic hedges |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (9,806) | (12,571)
Fair Value, Recurring | Proprietary trading |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (1) | (2)
Fair Value, Recurring | Effect of netting and allocation of collateral |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | 8,964 | 11,522
Fair Value, Recurring | NDT fund investments subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 17,798 | 16,398
Fair Value, Recurring | Cash equivalents |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 419 | 443
Fair Value, Recurring | Equities NDT |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 7,589 | 6,565
Fair Value, Recurring | Fixed income |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 4,041 | 3,843
Fair Value, Recurring | Private credit |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 133 | 151
Fair Value, Recurring | Rabbi trust investments |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 94 | 82
Fair Value, Recurring | Investments in equities |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 258 | 372
Fair Value, Recurring | Mark-to-market derivative assets subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 1,364 | 2,174
Fair Value, Recurring | Economic hedges |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 9,436 | 11,294
Fair Value, Recurring | Proprietary trading |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 1 | 2
Fair Value, Recurring | Effect of netting and allocation of collateral |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | (8,073) | (9,122)
Total assets measured at fair value | Fair Value, Recurring |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Total assets | 21,410 | 20,284
Level 1 | Fair Value, Recurring |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 130 | 42
DPP consideration | 0 | 0
Total assets | 8,598 | 7,769
Deferred compensation obligation | 0 | 0
Total liabilities measured at fair value | (66) | (94)
Total net assets | 8,532 | 7,675
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 130 | 42
Level 1 | Fair Value, Recurring | Mark-to-market derivative liabilities subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (66) | (94)
Level 1 | Fair Value, Recurring | Economic hedges |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (1,509) | (2,681)
Level 1 | Fair Value, Recurring | Proprietary trading |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | 0 | 0
Level 1 | Fair Value, Recurring | Effect of netting and allocation of collateral |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | 1,443 | 2,587
Level 1 | Fair Value, Recurring | NDT fund investments subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 8,043 | 6,973
Level 1 | Fair Value, Recurring | Cash equivalents |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 267 | 356
Level 1 | Fair Value, Recurring | Equities NDT |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 5,567 | 4,574
Level 1 | Fair Value, Recurring | Fixed income |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 2,209 | 2,043
Level 1 | Fair Value, Recurring | Private credit |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 0 | 0
Level 1 | Fair Value, Recurring | Rabbi trust investments |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 55 | 48
Level 1 | Fair Value, Recurring | Investments in equities |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 258 | 372
Level 1 | Fair Value, Recurring | Mark-to-market derivative assets subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 112 | 334
Level 1 | Fair Value, Recurring | Economic hedges |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 1,412 | 2,330
Level 1 | Fair Value, Recurring | Proprietary trading |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 0 | 0
Level 1 | Fair Value, Recurring | Effect of netting and allocation of collateral |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | (1,300) | (1,996)
Level 2 | Fair Value, Recurring |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 0 | 0
DPP consideration | 1,766 | 1,216
Total assets | 5,907 | 5,475
Deferred compensation obligation | (98) | (69)
Total liabilities measured at fair value | (292) | (681)
Total net assets | 5,615 | 4,794
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 0 | 0
Level 2 | Fair Value, Recurring | Mark-to-market derivative liabilities subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (194) | (612)
Level 2 | Fair Value, Recurring | Economic hedges |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (4,657) | (7,154)
Level 2 | Fair Value, Recurring | Proprietary trading |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | 0 | 0
Level 2 | Fair Value, Recurring | Effect of netting and allocation of collateral |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | 4,463 | 6,542
Level 2 | Fair Value, Recurring | NDT fund investments subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 3,640 | 3,600
Level 2 | Fair Value, Recurring | Cash equivalents |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 152 | 87
Level 2 | Fair Value, Recurring | Equities NDT |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 2,021 | 1,990
Level 2 | Fair Value, Recurring | Fixed income |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 1,467 | 1,523
Level 2 | Fair Value, Recurring | Private credit |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 0 | 0
Level 2 | Fair Value, Recurring | Rabbi trust investments |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 38 | 33
Level 2 | Fair Value, Recurring | Investments in equities |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 0 | 0
Level 2 | Fair Value, Recurring | Mark-to-market derivative assets subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 463 | 626
Level 2 | Fair Value, Recurring | Economic hedges |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 4,466 | 5,821
Level 2 | Fair Value, Recurring | Proprietary trading |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 0 | 0
Level 2 | Fair Value, Recurring | Effect of netting and allocation of collateral |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | (4,003) | (5,195)
Level 3 | Fair Value, Recurring |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 0 | 0
DPP consideration | 0 | 0
Total assets | 1,289 | 1,644
Deferred compensation obligation | 0 | 0
Total liabilities measured at fair value | (583) | (345)
Total net assets | 706 | 1,299
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract] |  |
Cash equivalents, fair value disclosure | 0 | 0
Level 3 | Fair Value, Recurring | Mark-to-market derivative liabilities subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (583) | (345)
Level 3 | Fair Value, Recurring | Economic hedges |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (3,640) | (2,736)
Level 3 | Fair Value, Recurring | Proprietary trading |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | (1) | (2)
Level 3 | Fair Value, Recurring | Effect of netting and allocation of collateral |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative liabilities | 3,058 | 2,393
Level 3 | Fair Value, Recurring | NDT fund investments subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 499 | 429
Level 3 | Fair Value, Recurring | Cash equivalents |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 0 | 0
Level 3 | Fair Value, Recurring | Equities NDT |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 1 | 1
Level 3 | Fair Value, Recurring | Fixed income |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 365 | 277
Level 3 | Fair Value, Recurring | Private credit |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 133 | 151
Level 3 | Fair Value, Recurring | Rabbi trust investments |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 1 | 1
Level 3 | Fair Value, Recurring | Investments in equities |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Investments, fair value disclosure | 0 | 0
Level 3 | Fair Value, Recurring | Mark-to-market derivative assets subtotal |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 789 | 1,214
Level 3 | Fair Value, Recurring | Economic hedges |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 3,558 | 3,143
Level 3 | Fair Value, Recurring | Proprietary trading |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | 1 | 2
Level 3 | Fair Value, Recurring | Effect of netting and allocation of collateral |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Mark-to-market derivative assets | (2,770) | (1,931)
Assets measured at NAV | Fair Value, Recurring |  |
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] |  |
Total assets | $ 5,616 | $ 5,396

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -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 (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a 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. 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