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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
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