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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

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