Constellation Energy (CEG) 10-Q 4 May 23 2023 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2023	Apr. 28, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-41137
Entity Registrant Name	CONSTELLATION ENERGY CORPORATION
Entity Tax Identification Number	87-1210716
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	1310 Point Street
Entity Address, City or Town	Baltimore
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21231-3380
City Area Code	(833)
Local Phone Number	883-0162
Title of 12(b) Security	Common Stock, without par value
Trading Symbol	CEG
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding		324,411,457
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001868275
Amendment Flag	false
Constellation Energy Generation, LLC
Document Information [Line Items]
Entity File Number	333-85496
Entity Registrant Name	CONSTELLATION ENERGY GENERATION, LLC
Entity Tax Identification Number	23-3064219
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	200 Exelon Way
Entity Address, City or Town	Kennett Square
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19348-2473
City Area Code	(833)
Local Phone Number	883-0162
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0001168165

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income, Parent - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating revenues
Operating revenues	$ 7,565	$ 5,431
Operating revenues from affiliates	0	160
Total operating revenues	7,565	5,591
Operating expenses
Purchased power and fuel	5,729	3,545
Purchased power and fuel from affiliates	0	5
Operating and maintenance	1,432	1,161
Operating and maintenance from affiliates	0	44
Depreciation and amortization	267	280
Taxes other than income taxes	132	137
Total operating expenses	7,560	5,172
Gain on sales of assets and businesses	26	16
Operating income	31	435
Other income and (deductions)
Interest expense, net	(107)	(55)
Interest expense to affiliates	0	(1)
Other, net	314	(318)
Total other income and (deductions)	207	(374)
Income before income taxes	238	61
Income taxes	131	(53)
Equity in losses of unconsolidated affiliates	(5)	(3)
Net income	102	111
Net income attributable to noncontrolling interests	6	5
Net income attributable to common shareholders	96	106
Comprehensive income, net of income taxes
Net income	102	111
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost	(1)	(1)
Actuarial loss reclassified to periodic cost	6	18
Pension and non-pension postretirement benefit plan valuation adjustment	(53)	0
Unrealized gain on foreign currency translation	0	4
Other comprehensive (loss) income, net of income taxes	(48)	21
Comprehensive income	54	132
Comprehensive income attributable to noncontrolling interests	6	5
Comprehensive income attributable to common shareholders	$ 48	$ 127
Average shares of common stock outstanding:
Basic (in shares)	328,000	327,000
Assumed exercise and/or distributions of stock-based awards (in shares)	0	1,000
Diluted (in shares)	328,000	328,000
Earnings per average common share
Basic (in dollars per share)	$ 0.29	$ 0.32
Diluted (in dollars per share)	$ 0.29	$ 0.32

Consolidated Statements of Cash

Consolidated Statements of Cash Flows, Parent - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net income	$ 102	$ 111
Adjustments to reconcile net income to net cash flows (used in) provided by operating activities
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	605	602
Gain on sales of assets and businesses	(26)	(16)
Deferred income taxes and amortization of ITCs	(33)	(307)
Net fair value changes related to derivatives	273	75
Net realized and unrealized (gains) losses on NDT funds	(187)	271
Net realized and unrealized losses on equity investments	5	20
Other non-cash operating activities	54	256
Changes in assets and liabilities:
Accounts receivable	513	(78)
Receivables from and payables to affiliates, net	0	20
Inventories	168	82
Accounts payable and accrued expenses	(1,516)	36
Option premiums paid, net	(23)	(31)
Collateral (posted) received, net	(261)	1,169
Income taxes	163	254
Pension and non-pension postretirement benefit contributions	(10)	(204)
Other assets and liabilities	(761)	(909)
Net cash flows (used in) provided by operating activities	(934)	1,351
Cash flows from investing activities
Capital expenditures	(660)	(410)
Proceeds from NDT fund sales	1,977	1,130
Investment in NDT funds	(2,030)	(1,193)
Collection of DPP, net	926	853
Proceeds from sales of assets and businesses	24	28
Other investing activities	(18)	(4)
Net cash flows provided by investing activities	219	404
Cash flows from financing activities
Change in short-term borrowings	(754)	(702)
Proceeds from short-term borrowings with maturities greater than 90 days	500	0
Repayments of short-term borrowings with maturities greater than 90 days	(200)	(300)
Issuance of long-term debt	1,353	2
Retirement of long-term debt	(30)	(1,058)
Retirement of long-term debt to affiliate	0	(258)
Contributions from Exelon	0	1,750
Dividends paid on common stock	(93)	(46)
Repurchases of common stock	(231)	0
Other financing activities	(22)	(23)
Net cash flows provided by (used in) financing activities	523	(635)
(Decrease) increase in cash, restricted cash, and cash equivalents	(192)	1,120
Cash, restricted cash, and cash equivalents at beginning of period	528	576
Cash, restricted cash, and cash equivalents at end of period	336	1,696
Supplemental cash flow information
Increase (decrease) in capital expenditures not paid	11	(119)
Increase in DPP	794	918
Increase in PP&E related to ARO update	$ 0	$ 335

Consolidated Balance Sheets, Pa

Consolidated Balance Sheets, Parent - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents		$ 237	$ 422
Restricted cash and cash equivalents		99	106
Accounts receivable
Customer accounts receivable (net of allowance for credit losses of $47 and $46 as of March 31, 2023 and December 31, 2022, respectively)		2,147	2,585
Other accounts receivable (net of allowance for credit losses of $5 as of March 31, 2023 and December 31, 2022)		542	731
Mark-to-market derivative assets		1,952	2,368
Inventories, net
Natural gas, oil and emission allowances		259	429
Materials and supplies		1,085	1,076
Renewable energy credits		720	617
Other		1,067	1,026
Total current assets		8,108	9,360
Property, plant, and equipment (net of accumulated depreciation and amortization of $16,861 and $16,726 as of March 31, 2023 and December 31, 2022, respectively)		20,074	19,822
Deferred debits and other assets
Nuclear decommissioning trust funds		14,606	14,114
Investments		223	202
Mark-to-market derivative assets		1,125	1,261
Deferred income taxes		45	44
Other		1,977	2,106
Total deferred debits and other assets		17,976	17,727
Total assets	[1]	46,158	46,909
Current liabilities
Short-term borrowings		705	1,159
Long-term debt due within one year		161	143
Accounts payable		1,558	2,828
Accrued expenses		743	906
Mark-to-market derivative liabilities		1,573	1,558
Renewable energy credit obligation		865	901
Other		342	344
Total current liabilities		5,947	7,839
Long-term debt		5,763	4,466
Deferred credits and other liabilities
Deferred income taxes and unamortized ITCs		2,982	3,031
Asset retirement obligations		12,831	12,699
Pension obligations		645	605
Non-pension postretirement benefit obligations		633	609
Spent nuclear fuel obligation		1,244	1,230
Payables related to Regulatory Agreement Units		3,069	2,897
Mark-to-market derivative liabilities		700	983
Other		1,258	1,178
Total deferred credits and other liabilities		23,362	23,232
Total liabilities	[1]	35,072	35,537
Commitments and contingencies (Note 12)
Shareholders' equity
Common stock (No par value, 1,000 shares authorized, 324 shares and 327 shares outstanding as of March 31, 2023 and December 31, 2022, respectively)		13,029	13,274
Retained deficit		(493)	(496)
Accumulated other comprehensive loss, net		(1,808)	(1,760)
Total shareholders’ equity		10,728	11,018
Noncontrolling interests		358	354
Total equity		11,086	11,372
Total liabilities and equity		$ 46,158	$ 46,909
[1]Our consolidated assets include $2,506 million and $2,641 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Our consolidated liabilities include $1,033 million and $1,041 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs for which the VIE creditors do not have recourse to us. See Note 14 — Variable Interest Entities for additional information.

Consolidated Balance Sheets, _2

Consolidated Balance Sheets, Parent (Parenthetical) - USD ($) shares in Millions, $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Allowance for credit losses		$ 47	$ 46
Allowance for other credit losses		5	5
Accumulated depreciation and amortization		$ 16,861	$ 16,726
Common stock, par value (in dollars per share)		$ 0	$ 0
Common stock, shares authorized (in shares)		1,000	1,000
Common stock, shares outstanding (in shares)		324	327
Total assets	[1]	$ 46,158	$ 46,909
Total liabilities	[1]	35,072	35,537
Variable Interest Entity, Primary Beneficiary
Total assets		2,701	2,842
Total liabilities		1,034	1,042
Variable Interest Entity, Primary Beneficiary | Nonrecourse
Total liabilities		1,033	1,041
Variable Interest Entity, Primary Beneficiary | Asset Pledged as Collateral
Total assets		$ 2,506	$ 2,641
[1]Our consolidated assets include $2,506 million and $2,641 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Our consolidated liabilities include $1,033 million and $1,041 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs for which the VIE creditors do not have recourse to us. See Note 14 — Variable Interest Entities for additional information.

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity, Parent - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Retained Deficit	Accumulated Other Comprehensive Loss, net	Noncontrolling Interests	Predecessor Member's Equity	[1]
Beginning Balance (in shares) at Dec. 31, 2021		0
Beginning balance at Dec. 31, 2021	$ 11,614	$ 0	$ 0	$ (31)	$ 395	$ 11,250
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	151					151
Separation-related adjustments	(197)			(2,006)	7	1,802
Changes in equity of noncontrolling interests	(7)				(7)
Ending Balance (in shares) at Jan. 31, 2022		326,664
Ending balance at Jan. 31, 2022	0	$ 13,203	0	0	0	(13,203)
Beginning Balance (in shares) at Dec. 31, 2021		0
Beginning balance at Dec. 31, 2021	11,614	$ 0	0	(31)	395	11,250
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	111
Other comprehensive loss, net of income taxes	21
Ending Balance (in shares) at Mar. 31, 2022		326,699
Ending balance at Mar. 31, 2022	11,505	$ 13,212	(91)	(2,016)	400	0
Beginning Balance (in shares) at Jan. 31, 2022		326,664
Beginning balance at Jan. 31, 2022	0	$ 13,203	0	0	0	(13,203)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(40)		(45)		5
Employee incentive plan (in shares)		35
Employee incentive plans	9	$ 9
Common stock dividends	(46)		(46)
Other comprehensive loss, net of income taxes	21			21
Ending Balance (in shares) at Mar. 31, 2022		326,699
Ending balance at Mar. 31, 2022	$ 11,505	$ 13,212	(91)	(2,016)	400	$ 0
Beginning Balance (in shares) at Dec. 31, 2022	327,000	327,130
Beginning balance at Dec. 31, 2022	$ 11,372	$ 13,274	(496)	(1,760)	354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	102		96		6
Employee incentive plan (in shares)		528
Employee incentive plans	6	$ 6
Changes in equity of noncontrolling interests	(2)				(2)
Common stock dividends	$ (93)		(93)
Common stock repurchased (in shares)	(3,200)	(3,239)
Common stock repurchased	$ (251)	$ (251)
Other comprehensive loss, net of income taxes	$ (48)			(48)
Ending Balance (in shares) at Mar. 31, 2023	324,000	324,419
Ending balance at Mar. 31, 2023	$ 11,086	$ 13,029	$ (493)	$ (1,808)	$ 358
[1]Represents Constellation’s predecessor member's equity prior to the separation transaction. Upon completion of the separation, the predecessor member's equity was transferred to CEG Parent’s Common stock. See Note 1 — Basis of Presentation for additional information on the separation.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity, Parent (Parenthetical) - $ / shares	2 Months Ended	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Common stock dividends (in dollars per share)	$ 0.14	$ 0.28

Consolidated Statements of Op_2

Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating revenues
Operating revenues	$ 7,565	$ 5,431
Operating revenues from affiliates	0	160
Total operating revenues	7,565	5,591
Operating expenses
Purchased power and fuel	5,729	3,545
Purchased power and fuel from affiliates	0	5
Operating and maintenance	1,432	1,161
Operating and maintenance from affiliates	0	44
Depreciation and amortization	267	280
Taxes other than income taxes	132	137
Total operating expenses	7,560	5,172
Gain on sales of assets and businesses	26	16
Operating income	31	435
Other income and (deductions)
Interest expense, net	(107)	(55)
Interest expense to affiliates	0	(1)
Other, net	314	(318)
Total other income and (deductions)	207	(374)
Income before income taxes	238	61
Income taxes	131	(53)
Equity in losses of unconsolidated affiliates	(5)	(3)
Net income	102	111
Net income attributable to noncontrolling interests	6	5
Net income attributable to common shareholders	96	106
Comprehensive income, net of income taxes
Net income	102	111
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost	(1)	(1)
Actuarial loss reclassified to periodic cost	6	18
Pension and non-pension postretirement benefit plan valuation adjustment	(53)	0
Unrealized gain on foreign currency translation	0	4
Other comprehensive (loss) income, net of income taxes	(48)	21
Comprehensive income	54	132
Comprehensive income attributable to noncontrolling interests	6	5
Comprehensive income attributable to common shareholders	48	127
Constellation Energy Generation, LLC
Operating revenues
Operating revenues	7,565	5,431
Operating revenues from affiliates	0	160
Total operating revenues	7,565	5,591
Operating expenses
Purchased power and fuel	5,729	3,545
Purchased power and fuel from affiliates	0	5
Operating and maintenance	1,432	1,161
Operating and maintenance from affiliates	0	44
Depreciation and amortization	267	280
Taxes other than income taxes	132	137
Total operating expenses	7,560	5,172
Gain on sales of assets and businesses	26	16
Operating income	31	435
Other income and (deductions)
Interest expense, net	(107)	(55)
Interest expense to affiliates	0	(1)
Other, net	314	(318)
Total other income and (deductions)	207	(374)
Income before income taxes	238	61
Income taxes	131	(53)
Equity in losses of unconsolidated affiliates	(5)	(3)
Net income	102	111
Net income attributable to noncontrolling interests	6	5
Net income attributable to common shareholders	96	106
Comprehensive income, net of income taxes
Net income	102	111
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost	(1)	(1)
Actuarial loss reclassified to periodic cost	6	18
Pension and non-pension postretirement benefit plan valuation adjustment	(53)	0
Unrealized gain on foreign currency translation	0	4
Other comprehensive (loss) income, net of income taxes	(48)	21
Comprehensive income	54	132
Comprehensive income attributable to noncontrolling interests	6	5
Comprehensive income attributable to common shareholders	$ 48	$ 127

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net income	$ 102	$ 111
Adjustments to reconcile net income to net cash flows (used in) provided by operating activities
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	605	602
Gain on sales of assets and businesses	(26)	(16)
Deferred income taxes and amortization of ITCs	(33)	(307)
Net fair value changes related to derivatives	273	75
Net realized and unrealized (gains) losses on NDT funds	(187)	271
Net realized and unrealized losses on equity investments	5	20
Other non-cash operating activities	(54)	(256)
Changes in assets and liabilities:
Accounts receivable	513	(78)
Receivables from and payables to affiliates, net	0	20
Inventories	168	82
Accounts payable and accrued expenses	(1,516)	36
Option premiums paid, net	(23)	(31)
Collateral (posted) received, net	(261)	1,169
Income taxes	163	254
Pension and non-pension postretirement benefit contributions	(10)	(204)
Other assets and liabilities	(761)	(909)
Net cash flows (used in) provided by operating activities	(934)	1,351
Cash flows from investing activities
Capital expenditures	(660)	(410)
Proceeds from NDT fund sales	1,977	1,130
Investment in NDT funds	(2,030)	(1,193)
Collection of DPP, net	926	853
Proceeds from sales of assets and businesses	24	28
Other investing activities	(18)	(4)
Net cash flows provided by investing activities	219	404
Cash flows from financing activities
Change in short-term borrowings	(754)	(702)
Proceeds from short-term borrowings with maturities greater than 90 days	500	0
Repayments of short-term borrowings with maturities greater than 90 days	(200)	(300)
Issuance of long-term debt	1,353	2
Retirement of long-term debt	(30)	(1,058)
Retirement of long-term debt to affiliate	0	(258)
Contributions from Exelon	0	1,750
Other financing activities	(22)	(23)
Net cash flows provided by (used in) financing activities	523	(635)
(Decrease) increase in cash, restricted cash, and cash equivalents	(192)	1,120
Cash, restricted cash, and cash equivalents at beginning of period	528	576
Cash, restricted cash, and cash equivalents at end of period	336	1,696
Supplemental cash flow information
Increase (decrease) in capital expenditures not paid	11	(119)
Increase in DPP	794	918
Increase in PP&E related to ARO update	0	335
Constellation Energy Generation, LLC
Cash flows from operating activities
Net income	102	111
Adjustments to reconcile net income to net cash flows (used in) provided by operating activities
Depreciation, amortization, and accretion, including nuclear fuel and energy contract amortization	605	602
Gain on sales of assets and businesses	(26)	(16)
Deferred income taxes and amortization of ITCs	(33)	(307)
Net fair value changes related to derivatives	273	75
Net realized and unrealized (gains) losses on NDT funds	(187)	271
Net realized and unrealized losses on equity investments	5	20
Other non-cash operating activities	(40)	(247)
Changes in assets and liabilities:
Accounts receivable	513	(71)
Receivables from and payables to affiliates, net	(78)	31
Inventories	168	82
Accounts payable and accrued expenses	(1,514)	7
Option premiums paid, net	(23)	(31)
Collateral (posted) received, net	(261)	1,169
Income taxes	163	254
Pension and non-pension postretirement benefit contributions	(10)	(204)
Other assets and liabilities	(737)	(901)
Net cash flows (used in) provided by operating activities	(1,000)	1,339
Cash flows from investing activities
Capital expenditures	(660)	(410)
Proceeds from NDT fund sales	1,977	1,130
Investment in NDT funds	(2,030)	(1,193)
Collection of DPP, net	926	853
Proceeds from sales of assets and businesses	24	28
Other investing activities	(18)	(4)
Net cash flows provided by investing activities	219	404
Cash flows from financing activities
Change in short-term borrowings	(754)	(702)
Proceeds from short-term borrowings with maturities greater than 90 days	500	0
Repayments of short-term borrowings with maturities greater than 90 days	(200)	(300)
Issuance of long-term debt	1,353	2
Retirement of long-term debt	(30)	(1,058)
Retirement of long-term debt to affiliate	0	(258)
Distributions to member	(249)	(46)
Contributions from Exelon	0	1,750
Other financing activities	(13)	(23)
Net cash flows provided by (used in) financing activities	607	(635)
(Decrease) increase in cash, restricted cash, and cash equivalents	(174)	1,108
Cash, restricted cash, and cash equivalents at beginning of period	501	576
Cash, restricted cash, and cash equivalents at end of period	327	1,684
Supplemental cash flow information
Increase (decrease) in capital expenditures not paid	11	(119)
Increase in DPP	794	918
Increase in PP&E related to ARO update	$ 0	$ 335

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents		$ 237	$ 422
Restricted cash and cash equivalents		99	106
Accounts receivable
Customer accounts receivable (net of allowance for credit losses of $47 and $46 as of March 31, 2023 and December 31, 2022, respectively)		2,147	2,585
Other accounts receivable (net of allowance for credit losses of $5 as of March 31, 2023 and December 31, 2022)		542	731
Mark-to-market derivative assets		1,952	2,368
Inventories, net
Natural gas, oil, and emission allowances		259	429
Materials and supplies		1,085	1,076
Renewable energy credits		720	617
Other		1,067	1,026
Total current assets		8,108	9,360
Property, plant, and equipment (net of accumulated depreciation and amortization of $16,861 and $16,726 as of March 31, 2023 and December 31, 2022, respectively)		20,074	19,822
Deferred debits and other assets
Nuclear decommissioning trust funds		14,606	14,114
Investments		223	202
Mark-to-market derivative assets		1,125	1,261
Deferred income taxes		45	44
Other		1,977	2,106
Total deferred debits and other assets		17,976	17,727
Total assets	[1]	46,158	46,909
Current liabilities
Short-term borrowings		705	1,159
Long-term debt due within one year		161	143
Accounts payable		1,558	2,828
Accrued expenses		743	906
Mark-to-market derivative liabilities		1,573	1,558
Renewable energy credit obligation		865	901
Other		342	344
Total current liabilities		5,947	7,839
Long-term debt		5,763	4,466
Deferred credits and other liabilities
Deferred income taxes and unamortized ITCs		2,982	3,031
Asset retirement obligations		12,831	12,699
Pension obligations		645	605
Non-pension postretirement benefit obligations		633	609
Spent nuclear fuel obligation		1,244	1,230
Payables related to Regulatory Agreement Units		3,069	2,897
Mark-to-market derivative liabilities		700	983
Other		1,258	1,178
Total deferred credits and other liabilities		23,362	23,232
Total liabilities	[1]	35,072	35,537
Commitments and contingencies
Member’s equity
Undistributed earnings		(493)	(496)
Accumulated other comprehensive loss, net		(1,808)	(1,760)
Total liabilities and equity		46,158	46,909
Constellation Energy Generation, LLC
Current assets
Cash and cash equivalents		236	403
Restricted cash and cash equivalents		91	98
Accounts receivable
Customer accounts receivable (net of allowance for credit losses of $47 and $46 as of March 31, 2023 and December 31, 2022, respectively)		2,147	2,585
Other accounts receivable (net of allowance for credit losses of $5 as of March 31, 2023 and December 31, 2022)		529	718
Mark-to-market derivative assets		1,952	2,368
Receivables from affiliates		39	0
Inventories, net
Natural gas, oil, and emission allowances		259	429
Materials and supplies		1,085	1,076
Renewable energy credits		720	617
Other		1,067	1,026
Total current assets		8,125	9,320
Property, plant, and equipment (net of accumulated depreciation and amortization of $16,861 and $16,726 as of March 31, 2023 and December 31, 2022, respectively)		20,074	19,822
Deferred debits and other assets
Nuclear decommissioning trust funds		14,606	14,114
Investments		223	202
Mark-to-market derivative assets		1,125	1,261
Deferred income taxes		45	44
Other		1,977	2,106
Total deferred debits and other assets		17,976	17,727
Total assets	[2]	46,175	46,869
Current liabilities
Short-term borrowings		705	1,159
Long-term debt due within one year		161	143
Accounts payable		1,543	2,810
Accrued expenses		687	869
Payables to affiliates		6	45
Mark-to-market derivative liabilities		1,573	1,558
Renewable energy credit obligation		865	901
Other		325	344
Total current liabilities		5,865	7,829
Long-term debt		5,763	4,466
Deferred credits and other liabilities
Deferred income taxes and unamortized ITCs		2,982	3,031
Asset retirement obligations		12,831	12,699
Pension obligations		645	605
Non-pension postretirement benefit obligations		633	609
Spent nuclear fuel obligation		1,244	1,230
Payables related to Regulatory Agreement Units		3,069	2,897
Mark-to-market derivative liabilities		700	983
Other		1,226	1,106
Total deferred credits and other liabilities		23,330	23,160
Total liabilities	[2]	34,958	35,455
Commitments and contingencies
Member’s equity
Membership interest		12,256	12,408
Undistributed earnings		411	412
Accumulated other comprehensive loss, net		(1,808)	(1,760)
Total member’s equity		10,859	11,060
Noncontrolling interests		358	354
Total equity		11,217	11,414
Total liabilities and equity		$ 46,175	$ 46,869
[1]Our consolidated assets include $2,506 million and $2,641 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Our consolidated liabilities include $1,033 million and $1,041 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs for which the VIE creditors do not have recourse to us. See Note 14 — Variable Interest Entities for additional information.[2]Our consolidated assets include $2,506 million and $2,641 million as of March 31, 2023 and December 31, 2022, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Our consolidated liabilities include $1,033 million and $1,041 million as of March 31, 2023 and December 31, 2022, respectively, of certain VIEs for which the VIE creditors do not have recourse to us. See Note 14 — Variable Interest Entities for additional information.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Allowance for credit losses		$ 47	$ 46
Allowance for other credit losses		(5)	(5)
Accumulated depreciation and amortization		16,861	16,726
Total assets	[1]	46,158	46,909
Total liabilities	[1]	35,072	35,537
Variable Interest Entity, Primary Beneficiary
Total assets		2,701	2,842
Total liabilities		1,034	1,042
Variable Interest Entity, Primary Beneficiary | Nonrecourse
Total liabilities		1,033	1,041
Variable Interest Entity, Primary Beneficiary | Asset Pledged as Collateral
Total assets		2,506	2,641
Constellation Energy Generation, LLC
Allowance for credit losses		47	46
Allowance for other credit losses		(5)	(5)
Accumulated depreciation and amortization		16,861	16,726
Total assets	[2]	46,175	46,869
Total liabilities	[2]	34,958	35,455
Constellation Energy Generation, LLC | Variable Interest Entity, Primary Beneficiary | Nonrecourse
Total liabilities		1,033	1,041
Constellation Energy Generation, LLC | Variable Interest Entity, Primary Beneficiary | Asset Pledged as Collateral
Total assets		$ 2,506	$ 2,641
[1]Our consolidated assets include $2,506 million and $2,641 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Our consolidated liabilities include $1,033 million and $1,041 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs for which the VIE creditors do not have recourse to us. See Note 14 — Variable Interest Entities for additional information.[2]Our consolidated assets include $2,506 million and $2,641 million as of March 31, 2023 and December 31, 2022, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Our consolidated liabilities include $1,033 million and $1,041 million as of March 31, 2023 and December 31, 2022, respectively, of certain VIEs for which the VIE creditors do not have recourse to us. See Note 14 — Variable Interest Entities for additional information.

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Undistributed Earnings	Accumulated Other Comprehensive Loss, net	Noncontrolling Interests	Constellation Energy Generation, LLC	Constellation Energy Generation, LLC Membership Interest	Constellation Energy Generation, LLC Undistributed Earnings	Constellation Energy Generation, LLC Accumulated Other Comprehensive Loss, net	Constellation Energy Generation, LLC Noncontrolling Interests
Beginning Balance at Dec. 31, 2021					$ 11,614	$ 10,482	$ 768	$ (31)	$ 395
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 111				111		106		5
Separation-related adjustments					(166)	1,844	(11)	(2,006)	7
Changes in equity of noncontrolling interests					(7)				(7)
Distributions to member					(46)		(46)
Other comprehensive loss, net of income taxes	21				21			21
Ending Balance at Mar. 31, 2022					11,527	12,326	817	(2,016)	400
Beginning Balance at Dec. 31, 2022					11,414	12,408	412	(1,760)	354
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	102	$ 96		$ 6	102		96		6
Changes in equity of noncontrolling interests	(2)			$ (2)	(2)				(2)
Distributions to member					(249)	(152)	(97)
Other comprehensive loss, net of income taxes	$ (48)		$ (48)		(48)			(48)
Ending Balance at Mar. 31, 2023					$ 11,217	$ 12,256	$ 411	$ (1,808)	$ 358

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Description of Business We are a producer of clean energy and a supplier of energy products and services. Our generating capacity includes primarily nuclear, wind, solar, natural gas and hydroelectric assets. Through our integrated business operations, we sell electricity, natural gas, and other energy related products and sustainable solutions to various types of customers, including distribution utilities, municipalities, cooperatives, and commercial, industrial, governmental, and residential customers in markets across multiple geographic regions. We have five reportable segments: Mid-Atlantic, Midwest, New York, ERCOT and Other Power Regions. Basis of Presentation On February 21, 2021, the board of directors of Exelon authorized management to pursue a plan to separate its competitive generation and customer-facing energy businesses (separation), conducted through Constellation Energy Generation, LLC (“Constellation”, formerly Exelon Generation Company, LLC) and its subsidiaries, into an independent, publicly-traded company. CEG Parent, a direct, wholly owned subsidiary of Exelon, was newly formed for the purpose of consummating the separation and had not engaged in any business activities nor had any assets or liabilities prior to the separation. On February 1, 2022, the separation was completed and CEG Parent holds all the interests in Constellation previously held by Exelon. As an individual registrant, Constellation has historically filed consolidated financial statements to reflect its financial position and operating results as a stand-alone, wholly owned subsidiary of Exelon. The accompanying Consolidated Financial Statements as of March 31, 2023 and for the three months ended March 31, 2023 and 2022 are unaudited but, in our opinion include all adjustments that are considered necessary for a fair statement of the financial statements in accordance with GAAP. All adjustments are of a normal, recurring nature, except as otherwise disclosed. The Consolidated Financial Statements include the accounts of our subsidiaries and all intercompany transactions have been eliminated. CEG Parent's prior period financial statements have been adjusted to reflect the balances of Constellation in accordance with applicable guidance. Constellation's December 31, 2022 Consolidated Balance Sheet was derived from audited financial statements. The interim financial statements are to be read in conjunction with prior annual financial statements and notes. Financial results for interim periods are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2023. These Combined Notes to Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Amounts disclosed relate to CEG Parent and Constellation unless specifically noted as relating to CEG Parent only. Unless otherwise indicated or the context otherwise requires, references herein to the terms “we,” “us,” and “our” refer collectively to CEG Parent and Constellation. Separation from Exelon On February 1, 2022, Exelon completed the separation through a pro-rata distribution of all of the outstanding shares of CEG Parent's common stock, no par value, on the basis of one such share for every three shares of Exelon common stock held on January 20, 2022, the record date of the distribution. CEG Parent is an independent, publicly traded company listed on the Nasdaq Stock Market under the symbol “CEG”, and regular-way trading began on February 2, 2022. Exelon no longer retains any ownership interest in CEG Parent or Constellation. Prior to completion of the separation, our financial statements include certain transactions with affiliates of Exelon, which are disclosed as related party transactions. After February 1, 2022, all transactions with Exelon or its affiliates are no longer related party transactions. In order to govern the ongoing relationships with Exelon after the separation, and to facilitate an orderly transition, we entered into several agreements with Exelon, including a Separation Agreement, TSA, EMA, and TMA. Pursuant to the Separation Agreement, we received a cash contribution of $1.75 billion from Exelon on January 31, 2022, the proceeds of which were used to settle $258 million of an intercompany loan from Exelon and $200 million of short-term debt outstanding prior to separation, in addition to a $192 million contribution to our pension plans. We also entered into two new five-year facility agreements providing $4.5 billion of capacity. The amounts Exelon billed us for services pursuant to the TSA were $50 million and $56 million for the three months ended March 31, 2023 and 2022, respectively and the amounts we billed Exelon for services pursuant to the TSA were $6 million and $9 million for the three months ended March 31, 2023 and 2022, respectively. See Note 1 — Basis of Presentation of our 2022 Form 10-K for additional information on the separation from Exelon. Summary of Significant Accounting Policies See Note 1 — Basis of Presentation of our 2022 Form 10-K for additional information on significant accounting policies.

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2023
Regulated Operations [Abstract]
Regulatory Matters	Regulatory Matters As discussed in Note 3 — Regulatory Matters of our 2022 Form 10-K, we are involved in various regulatory and legislative proceedings. The following discusses developments in 2023 and updates to the 2022 Form 10-K. PJM Performance Bonuses On December 23, 2022, and continuing through the morning of December 25, 2022, winter storm Elliott blanketed the entirety of PJM’s footprint with record low temperatures and extreme weather conditions. A significant portion of PJM's fossil generation fleet failed to perform as reserves were called. PJM issued invoices in April 2023 that reflected generator’s gross bonuses and non-performance charges. In accordance with its tariff, funds collected from those charges are redistributed to generating resources that overperformed during the event, including our nuclear fleet. As a result of additional information received, we recognized an increase in revenue of $38 million (pre-tax) during the three months ended March 31, 2023. Our total estimated receivable for performance bonuses (net of non-performance charges) is $148 million as of March 31, 2023, and continues to require the application of significant judgement and assumptions that include potential impacts of generator defaults and litigation. It is reasonably possible that the ultimate impact to our consolidated financial statements could differ materially once these uncertainties are resolved. Impacts of the February 2021 Extreme Cold Weather Event and Texas-based Generating Assets Outages In February 2021, our Texas-based generating assets within the ERCOT market, specifically Colorado Bend II, Wolf Hollow II, and Handley, experienced outages because of extreme cold weather conditions. In addition, those weather conditions drove increased demand for service, dramatically increased wholesale power prices, and increased gas prices in certain regions. In response to the high demand and significantly reduced total generation on the system during the event, the PUCT directed ERCOT to use an administrative price cap of $9,000/MWh during firm load shedding. We intervened in a third-party notice of appeal in the Court of Appeals for the Third District of Texas ("Third Court of Appeals") challenging the validity of the PUCT’s action administratively setting prices at $9,000/MWh. Additionally, we filed a request for declaratory judgment in Texas district court, which is being stayed at pending the outcome of that case. On March 17, 2023, the Third Court of Appeals reversed the PUCT’s orders directing ERCOT to use an administrative price cap of $9,000/MWh during firm load shedding, finding that the PUCT violated Texas law by exceeding its authority granted by the legislature. The PUCT and aligned parties appealed the decision to the Supreme Court of Texas. We cannot reasonably predict the outcome of these proceedings or the potential financial statement impact. New England Regulatory Matters Mystic Units 8 and 9 Cost of Service Agreement. The Mystic Cost of Service Agreement (“Mystic COS”) requires an annual process whereby we identify and support our projected costs under the agreement and/or true-up previous projections to the actual costs incurred. The first annual process resulted in a filing at FERC on September 15, 2021 and included our projection of capital expenditures to be recovered under the Mystic COS between June 1, 2022 and December 31, 2022. On April 28, 2022, FERC issued an order setting for settlement and/or hearing the issue of whether our projected 2022 capital expenditures can be recovered. On February 6, 2023, we reached a settlement in principle with certain parties to the proceeding, and an offer of settlement was filed at FERC on March 15, 2023 , where it remains pending. No party contested the settlement. If approved, the settlement would reduce the recovery we receive for capital projects over the term of the Mystic COS. The settlement would also eliminate the possibility that we would need to refund certain costs recovered under the COS Agreement for the EMT facility if the EMT facility continues operating post-Cost-of-Service (the "EMT Clawback" issue), thus resolving an issue remanded to FERC by the D.C. Circuit in the August 2022 decision. We do not expect the outcome of this offer of settlement to have a material financial statement impact. On September 15, 2022, we made our second annual filing at FERC, which included (1) our projection of capital expenditures to be recovered under the Mystic COS between January 1, 2023 and December 31, 2023, and (2) an updated projection of the Annual Fixed Revenue Requirement, the Maximum Monthly Fixed Cost Payment, and the Fixed Operating and Maintenance/Return on Investment component of the Monthly Fuel Cost Charge, including an update to rate base for the period between January 1, 2018 and December 31, 2021. That filing is currently pending at FERC. On March 28, 2023, FERC issued an order on remand from the D.C. Circuit’s August 2022 decision ("FERC Remand Order"). The D.C. Circuit’s August 2022 decision remanded back to FERC certain issues related to the Mystic COS. The FERC Remand Order affirmed that 91% of EMT’s fixed costs will be recovered via the Mystic COS, subject to the reinstatement of a margin sharing mechanism on forward sales of vapor. It also granted our motion to hold in abeyance the EMT Clawback issue, as that matter will be resolved by the settlement agreement filed at FERC in March 2023 if FERC approves the settlement. No party sought rehearing of the FERC Remand Order. Operating License Renewals

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers We recognize revenue from contracts with customers to depict the transfer of goods or services to customers at an amount that we expect to be entitled to in exchange for those goods or services. Our primary sources of revenue include competitive sales of power, natural gas, and other energy-related products and sustainable solutions. See Note 4 — Revenue from Contracts with Customers of our 2022 Form 10-K for additional information regarding the primary sources of revenue. Contract Balances Contract Assets We record contract assets for the revenue recognized on the construction and installation of energy efficiency assets and new power generating facilities before we have an unconditional right to bill for and receive the consideration from the customer. These contract assets are subsequently reclassified to receivables when the right to payment becomes unconditional. We record contract assets and contract receivables in Other current assets and Customer accounts receivable, net, respectively, in the Consolidated Balance Sheets. The following table provides a rollforward of the contract assets reflected in the Consolidated Balance Sheets for the three months ended March 31, 2023 and 2022. Contract Assets Balance as of December 31, 2022 $ 130 Amounts reclassified to receivables (11) Revenues recognized 31 Balance as of March 31, 2023 $ 150 Balance as of December 31, 2021 $ 149 Amounts reclassified to receivables (16) Revenues recognized 9 Balance as of March 31, 2022 $ 142 Contract Liabilities We record contract liabilities when consideration is received or due prior to the satisfaction of the performance obligations. We record contract liabilities in Other current liabilities and Other deferred credits and other liabilities in the Consolidated Balance Sheets. These contract liabilities primarily relate to upfront consideration received or due for equipment service plans, the Mystic COS, and the Illinois ZEC program. The Mystic COS includes upfront consideration received or due that differs from the recognized earnings over the cost of the service period. The Illinois ZEC program introduces an annual cap on the total consideration to be received by us for each delivery period. The ZEC price is established on a per MWh of production basis with a maximum annual cap for total compensation to be received in a delivery period, while requiring delivery of all ZECs produced by our participating facilities during each delivery period. ZECs delivered to Illinois utilities in excess of the annual cost cap may be paid in subsequent years if the payments do not exceed the prescribed annual cost cap for that year. The following table provides a rollforward of the contract liabilities reflected in the Consolidated Balance Sheets for the three months ended March 31, 2023 and 2022. Contract Liabilities Balance as of December 31, 2022 $ 47 Consideration received or due 131 Revenues recognized (115) Balance as of March 31, 2023 $ 63 Balance as of December 31, 2021 $ 75 Consideration received or due 50 Revenues recognized (63) Balance as of March 31, 2022 $ 62 The following table reflects revenues recognized in the three months ended March 31, 2023 and 2022, which were included in contract liabilities at December 31, 2022 and 2021, respectively: Three Months Ended March 31, 2023 2022 Revenues recognized $ 10 $ 28 Transaction Price Allocated to Remaining Performance Obligations The following table shows the amounts of future revenues expected to be recorded in each year for performance obligations that are unsatisfied or partially unsatisfied as of March 31, 2023. This disclosure only includes contracts for which the total consideration is fixed and determinable at contract inception. The average contract term varies by customer type and commodity, but ranges from one month to several years. This disclosure excludes our power and gas sales contracts as they contain variable volumes and/or variable pricing. 2023 2024 2025 2026 2027 and thereafter Total Remaining performance obligations $ 195 $ 82 $ 32 $ 15 $ 136 $ 460 Revenue Disaggregation We disaggregate the revenue recognized from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. See Note 4 — Segment Information for the presentation of revenue disaggregation.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are determined based on information used by the CODM in deciding how to evaluate performance and allocate resources. We have five reportable segments consisting of the Mid-Atlantic, Midwest, New York, ERCOT, and all other power regions referred to collectively as “Other Power Regions.” The basis for our reportable segments is the integrated management of our electricity business that is located in different geographic regions, and largely representative of the footprints of ISO/RTO and/or NERC regions, which utilize multiple supply sources to provide electricity through various distribution channels (wholesale and retail). Our hedging strategies and risk metrics are also aligned to these same geographic regions. Descriptions of each of our five reportable segments are as follows: • Mid-Atlantic represents operations in the eastern half of PJM, which includes New Jersey, Maryland, Virginia, West Virginia, Delaware, the District of Columbia, and parts of Pennsylvania and North Carolina. • Midwest represents operations in the western half of PJM and the United States footprint of MISO, excluding MISO’s Southern Region. • New York represents operations within NYISO. • ERCOT represents operations within Electric Reliability Council of Texas that covers a majority of the state of Texas. • Other Power Regions: • New England represents operations within ISO-NE. • South represents operations in FRCC, MISO’s Southern Region, and the remaining portions of SERC not included within MISO or PJM. • West represents operations in WECC, which includes CAISO. • Canada represents operations across the entire country of Canada and includes AESO, OIESO, and the Canadian portion of MISO. The CODM evaluates the performance of our electric business activities and allocates resources based on Operating revenues net of Purchased power and fuel expense (RNF). We believe this is a useful measurement of operational performance, although it is not a presentation defined under GAAP and may not be comparable to other companies’ presentations of similarly titled measures or deemed more useful than the GAAP information provided elsewhere in these financial statements. Our operating revenues include all sales to third parties and affiliate sales to Exelon's utility subsidiaries prior to the separation. Purchased power costs include all costs associated with the procurement and supply of electricity including capacity, energy, and ancillary services. Fuel expense includes the fuel costs for our owned generation and fuel costs associated with tolling agreements. The results of our other business activities are not regularly reviewed by the CODM and are therefore not classified as operating segments or included in the regional reportable segment amounts. These activities include wholesale and retail sales of natural gas, as well as other miscellaneous business activities that are not significant to our overall results of operations. Further, our unrealized mark-to-market gains and losses on economic hedging activities and our amortization of certain intangible assets and liabilities relating to commodity contracts recorded at fair value from mergers and acquisitions are also excluded from the regional reportable segment amounts. The CODM does not use a measure of total assets in making decisions regarding allocating resources to or assessing the performance of these reportable segments. The following tables disaggregate the revenue recognized from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. The disaggregation of revenues reflects our two primary products of power sales and natural gas sales, with further disaggregation of power sales provided by geographic region. The following tables also show the reconciliation of reportable segment revenues and RNF to our total revenues and RNF for the three months ended March 31, 2023 and 2022. Three Months Ended March 31, 2023 Revenues from external customers Contracts with customers Other (a) Total Intersegment Revenues Total Revenues Mid-Atlantic $ 1,413 $ (137) $ 1,276 $ (31) $ 1,245 Midwest 1,195 (165) 1,030 2 1,032 New York 464 37 501 34 535 ERCOT 200 (32) 168 1 169 Other Power Regions 1,518 279 1,797 (6) 1,791 Total Competitive Businesses Electric Revenues 4,790 (18) 4,772 — 4,772 Competitive Businesses Natural Gas Revenues 895 590 1,485 — 1,485 Competitive Businesses Other Revenues (b) 148 1,160 1,308 — 1,308 Total Consolidated Operating Revenues $ 5,833 $ 1,732 $ 7,565 $ — $ 7,565 Three Months Ended March 31, 2022 Revenues from external customers (c) Contracts with customers Other (a) Total Intersegment Revenues Total Revenues Mid-Atlantic $ 1,154 $ (50) $ 1,104 $ — $ 1,104 Midwest 1,248 (51) 1,197 — 1,197 New York 494 (135) 359 6 365 ERCOT 163 72 235 — 235 Other Power Regions 1,421 512 1,933 (6) 1,927 Total Competitive Businesses Electric Revenues 4,480 348 4,828 — 4,828 Competitive Businesses Natural Gas Revenues 811 634 1,445 — 1,445 Competitive Businesses Other Revenues (b) 86 (768) (682) — (682) Total Consolidated Operating Revenues $ 5,377 $ 214 $ 5,591 $ — $ 5,591 __________ (a) Includes revenues from derivatives and leases. (b) Represents activities not allocated to a region. See text above for a description of included activities. Includes unrealized mark-to-market gains of $929 million and losses of $921 million for the three months ended March 31, 2023 and 2022, respectively, and the elimination of intersegment revenues. (c) Includes all wholesale and retail electric sales to third parties and affiliate sales to Exelon's utility subsidiaries prior to the separation on February 1, 2022. See Note 16 - Related Party Transactions for additional information. Three Months Ended March 31, 2023 Three Months Ended March 31, 2022 RNF from external customers Intersegment RNF Total RNF from external customers (a) Intersegment Total Mid-Atlantic $ 722 $ (31) $ 691 $ 509 $ (1) $ 508 Midwest 690 (1) 689 785 — 785 New York 225 36 261 260 8 268 ERCOT 53 (1) 52 106 (27) 79 Other Power Regions 256 (8) 248 297 (10) 287 Total RNF for Reportable Segments 1,946 (5) 1,941 1,957 (30) 1,927 Other (b) (110) 5 (105) 84 30 114 Total RNF $ 1,836 $ — $ 1,836 $ 2,041 $ — $ 2,041 __________ (a) Includes purchases and sales from/to third parties and affiliate sales to Exelon's utility subsidiaries prior to the separation on February 1, 2022. See Note 16 - Related Party Transactions for additional information. (b) Other represents activities not allocated to a region. See text above for a description of included activities. Primarily includes: • Unrealized mark-to-market losses of $266 million and $92 million for the three months ended March 31, 2023 and 2022, respectively. • The elimination of intersegment RNF.

Accounts Receivable

Accounts Receivable	3 Months Ended
	Mar. 31, 2023
Receivables [Abstract]
Accounts Receivable	Accounts Receivable Unbilled Customer Revenue We recorded $364 million and $564 million of unbilled customer revenues in Customer accounts receivables, net in the Consolidated Balance Sheets as of March 31, 2023 and December 31, 2022, respectively. Sales of Customer Accounts Receivable On April 8, 2020, NER, a bankruptcy remote, special purpose entity, which is wholly owned by us, entered into a revolving accounts receivable financing arrangement with a number of financial institutions and a commercial paper conduit (the "Purchasers") to sell certain customer accounts receivable (the "Facility"). On August 16, 2022, we entered into an amendment on the Facility, which increased the maximum funding limit of the Facility from $900 million to $1.1 billion and extended the term of the Facility through August 15, 2025, unless renewed by the mutual consent of the parties in accordance with its terms. Under the Facility, NER may sell eligible short-term customer accounts receivable to the Purchasers in exchange for cash and subordinated interest. The transfers are reported as sales of receivables in the consolidated financial statements. The subordinated interest in collections upon the receivables sold to the Purchasers is referred to as the DPP, which is reflected in Other current assets in the Consolidated Balance Sheets. The Facility requires the balance of eligible receivables to be maintained at or above the balance of cash proceeds received from the Purchasers. To the extent the eligible receivables decrease below such balance, we are required to repay cash to the Purchasers. When eligible receivables exceed cash proceeds, we have the ability to increase the cash received up to the maximum funding limit. These cash inflows and outflows impact the DPP. The following tables summarize the impact of the sale of certain receivables: As of March 31, 2023 As of December 31, 2022 Derecognized receivables transferred at fair value $ 1,474 $ 1,615 Cash proceeds received 1,100 1,100 DPP 374 515 Three Months Ended March 31, 2023 2022 Loss on sale of receivables (a) $ 20 $ 10 __________ (a) Reflected in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. This represents the amount by which the accounts receivable sold into the Facility are discounted, limited to credit losses. Three Months Ended March 31, 2023 2022 Proceeds from new transfers (a) $ 1,957 $ 1,654 Cash collections received on DPP 926 853 Cash collections reinvested in the Facility 2,883 2,507 __________ (a) Customer accounts receivable sold into the Facility were $2,750 million and $2,572 million for the three months ended March 31, 2023 and 2022, respectively. Our risk of loss following the transfer of accounts receivable is limited to the DPP outstanding. Payment of DPP is not subject to significant risks other than delinquencies and credit losses on accounts receivable transferred. We continue to service the receivables sold in exchange for a servicing fee. We did not record a servicing asset or liability as the servicing fees were not material. We recognize the cash proceeds received upon sale in Cash flows from operating activities in the Consolidated Statements of Cash Flows. The collection and reinvestment of DPP is recognized in Cash flows from investing activities in the Consolidated Statements of Cash Flows. See Note 11 — Fair Value of Financial Assets and Liabilities and Note 14 — Variable Interest Entities for additional information. Other Sales of Customer Accounts Receivables We are required, under supplier tariffs, to sell customer receivables to utility companies. The following table presents the total receivables sold. Three Months Ended March 31, 2023 2022 Total receivables sold $ 184 $ 69

Nuclear Decommissioning

Nuclear Decommissioning	3 Months Ended
	Mar. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]
Nuclear Decommissioning	Nuclear Decommissioning Nuclear Decommissioning Asset Retirement Obligations We have a legal obligation to decommission our nuclear power plants following the permanent cessation of operations. To estimate our nuclear decommissioning obligations, we use a probability-weighted, discounted cash flow model which, on a unit-by-unit basis, considers multiple outcome scenarios that include significant estimates and assumptions, and are based on decommissioning cost studies, cost escalation rates, probabilistic cash flow models, and discount rates. We update our AROs annually, unless circumstances warrant more frequent updates, based on our review of updated cost studies and our annual evaluation of cost escalation factors and probabilities assigned to various scenarios. The financial statement impact for changes in the ARO, on an individual unit basis, due to the changes in and timing of estimated cash flows generally result in a corresponding change in the unit’s ARC in Property, plant, and equipment in the Consolidated Balance Sheets. If the ARO decreases for a Non-Regulatory Agreement unit without any remaining ARC, the corresponding change is recorded as a decrease in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. The following table provides a rollforward of the nuclear decommissioning AROs reflected in the Consolidated Balance Sheets from December 31, 2022 to March 31, 2023: Balance as of December 31, 2022 (a) $ 12,500 Accretion expense 139 Costs incurred related to decommissioning plants (8) Balance as of March 31, 2023 (a) $ 12,631 __________ (a) Includes $36 million and $40 million as the current portion of the ARO as of March 31, 2023 and December 31, 2022, respectively, which is included in Other current liabilities in the Consolidated Balance Sheets. NDT Funds We had NDT funds totaling $14,676 million and $14,127 million as of March 31, 2023 and December 31, 2022, respectively. The NDT funds also include $70 million and $13 million for the current portion of the NDT funds as of March 31, 2023 and December 31, 2022, respectively, which are included in Other current assets in the Consolidated Balance Sheets. See Note 15 — Supplemental Financial Information for additional information on activities of the NDT funds. Accounting Implications of the Regulatory Agreement Units See Note 1 — Basis of Presentation and Note 10 — Asset Retirement Obligations of our 2022 Form 10-K for additional information on the Regulatory Agreement Units. The following table presents our noncurrent payables to ComEd and PECO which are recorded as Payables related to Regulatory Agreement Units as of March 31, 2023 and December 31, 2022: March 31, 2023 December 31, 2022 ComEd $ 2,804 $ 2,660 PECO 265 237 Payables related to Regulatory Agreement Units $ 3,069 $ 2,897 NRC Minimum Funding Requirements NRC regulations require that licensees of nuclear generating facilities demonstrate reasonable assurance that funds will be available in specified minimum amounts to decommission the facility at the end of its life. We filed our biennial decommissioning funding status report with the NRC on March 23, 2023 for all units, including our shutdown units, except for Zion Station which is included in a separate report to the NRC submitted by ZionSolutions, LLC. The status report demonstrated adequate decommissioning funding assurance as of December 31, 2022 for all units except for Peach Bottom Unit 1. As a former PECO plant, financial assurance for decommissioning Peach Bottom Unit 1 is provided by the NDT fund, collections from PECO customers, and the ability to adjust those collections in accordance with the approved PAPUC tariff. See Note 10 — Asset Retirement Obligations of our 2022 Form 10-K for information regarding the amount collected from PECO customers for decommissioning costs. Impact of Separation from Exelon Satisfying a condition precedent, on December 16, 2021, the NYPSC authorized our separation from Exelon and accepted the terms of a Joint Proposal that became binding upon closing of the separation on February 1, 2022. As part of the Joint Proposal, among other items, we have projected completion of radiological decommissioning and site restoration activities necessary to achieve a partial site release from the NRC (release of the site for unrestricted use, except for any on-site dry cask storage) within 20 years from the end of licensed life for each of our Ginna and FitzPatrick units and from the end of licensed life for the last of the NMP operating units. While there is flexibility under the Joint Proposal, there was an increase to the AROs associated with our New York nuclear plants during the first quarter of 2022. The Joint Proposal also required a contribution of $15 million to the NDT for NMP Unit 2 in January 2022 and requires various financial assurance mechanisms through the duration of decommissioning and site restoration, including a minimum NDT balance for each unit, adjusted for specific stages of decommissioning, and a parent guaranty for site restoration costs updated annually as site restoration progresses, which must be replaced with a third-party surety bond or equivalent financial instrument in the event we fall below investment grade. See Note 1 — Basis of Presentation for additional information.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Rate Reconciliation The effective income tax rate from continuing operations varies from the U.S. federal statutory rate principally due to the following: Three Months Ended March 31, 2023 (a) 2022 (a) U.S. federal statutory rate 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 3.3 55.2 Qualified NDT fund income and losses 33.7 (127.5) Amortization of investment tax credit, including deferred taxes on basis differences (0.7) (9.2) Production tax credits and other credits (0.8) (34.8) Noncontrolling interests — (1.0) Other (1.5) 9.4 Effective income tax rate (b) 55.0 % (86.9) % __________ (a) Positive percentages represent income tax expense. Negative percentages represent income tax benefit. (b) The effective tax rate in 2023 is primarily due to the impacts of realized and unrealized NDT income on Income before income taxes. The effective tax rate in 2022 is primarily due to the impacts of unrealized NDT losses on Income before income taxes and one-time income tax adjustments. Other Tax Matters Tax Matters Agreement In connection with the separation, we entered into a TMA with Exelon. The TMA governs the respective rights, responsibilities, and obligations between us and Exelon after the separation with respect to tax liabilities and benefits, tax attributes, tax returns, tax contests and other tax sharing regarding U.S. federal, state, local and foreign income taxes, other tax matters and related tax returns. Responsibility and Indemnification for Taxes . As a former subsidiary of Exelon, we have joint and several liability with Exelon to the IRS and certain state jurisdictions relating to federal and state tax filings we were included in prior to the separation. The TMA specifies the portion of this tax liability for which we bear contractual responsibility. Specifically, we are liable for our share of certain taxes required to be paid by Exelon with respect to taxable years or periods (or portions thereof) ending on or prior to the separation to the extent that we would have been responsible for such taxes under the Exelon tax sharing agreement then existing. As of March 31, 2023 and December 31, 2022, our Consolidated Balance Sheets reflect a payable of $32 million for tax liabilities where we maintain contractual responsibility to Exelon, with $18 million in Other accounts receivable and $50 million in Noncurrent other liabilities. Tax Refunds and Attributes . The TMA provides for the allocation of certain pre-closing tax attributes between us and Exelon, along with our share of refunds for taxes claimed by Exelon for periods prior to separation. Upon separation, certain attributes that were generated by our business were allocated to Exelon, and under the TMA, Exelon will reimburse Constellation when those attributes are utilized. As of March 31, 2023 , our Consolidated Balance Sheet reflects receivables of $212 million and $319 million in Other accounts receivable and Other deferred debits and other assets, respectively. As of December 31, 2022 , our Consolidated Balance Sheet reflected receivables of $168 million and $362 million in Other accounts receivable and Other deferred debits and other assets, respectively.

Retirement Benefits

Retirement Benefits	3 Months Ended
	Mar. 31, 2023
Retirement Benefits [Abstract]
Retirement Benefits	Retirement Benefits Defined Benefit Pension and OPEB During the first quarter of 2023, we received an updated valuation of our pension and OPEB obligations to reflect actual census data as of January 1, 2023. This valuation resulted in increases to the pension and OPEB obligations totaling $48 million and $21 million, respectively, with an offset to accumulated other comprehensive loss of $53 million (after-tax). The key assumptions used in the updated valuation of our pension and OPEB obligations, such as discount rate and expected long-term rate of return on plan assets, were unchanged from those used as of December 31, 2022. Components of Net Periodic Benefit Costs (Credits) We report the service cost and other non-service cost (credit) components of net periodic benefit costs (credits) for all plans separately in our Consolidated Statements of Operations and Comprehensive Income. Effective February 1, 2022, the service cost component is included in Operating and maintenance expense and Property, plant, and equipment, net (where criteria for capitalization of direct labor has been met) while the non-service cost (credit) components are included in Other, net, in accordance with single employer plan accounting. Prior to separation, we were allocated our portion of pension and OPEB service and non-service costs (credits) from Exelon, which was included in Operating and maintenance expense. Our portion of the total net periodic benefit costs allocated to us from Exelon in 2022 prior to separation was not material and remains in total Operating and maintenance expense. The following tables present the components of our net periodic benefit costs (credits), prior to capitalization and co-owner allocations, for the three months ended March 31, 2023 and 2022: Pension Benefits OPEB Total Pension Benefits and OPEB Three Months Ended March 31, Three Months Ended March 31, Three Months Ended March 31, 2023 2022 2023 2022 2023 2022 Components of net periodic benefit cost Service cost $ 22 $ 33 $ 4 $ 6 $ 26 $ 39 Non-service components of pension benefits & OPEB (credit) cost Interest cost 99 70 18 13 117 83 Expected return on assets (127) (137) (11) (14) (138) (151) Amortization of: Prior service cost (credit) — — (2) (2) (2) (2) Actuarial loss (gain) 12 38 (3) — 9 38 Non-service components of pension benefits & OPEB (credit) cost (16) (29) 2 (3) (14) (32) Net periodic benefit cost (a,b) $ 6 $ 4 $ 6 $ 3 $ 12 $ 7 __________ (a) The pension benefit and OPEB service costs reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2023 totaled $24 million. The pension benefit and OPEB non-service costs (credits) reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2023 totaled ($14) million. (b) The pension benefit and OPEB service costs reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2022 totaled $30 million. The pension benefit and OPEB non-service costs (credits) reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2022 totaled ($25) million.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments We use derivative instruments to manage commodity price risk, interest rate risk, and foreign exchange risk related to ongoing business operations. Authoritative guidance requires that derivative instruments be recognized as either assets or liabilities at fair value, with changes in fair value of the derivative recognized in earnings immediately. Other accounting treatments are available through special election and designation, provided they meet specific, restrictive criteria both at the time of designation and on an ongoing basis. These alternative permissible accounting treatments include NPNS, cash flow hedges, and fair value hedges. All derivative economic hedges related to commodities, referred to as economic hedges, are recorded at fair value through earnings. For all NPNS derivative instruments, accounts receivable or accounts payable are recorded when derivatives settle and revenue or expense is recognized in earnings as the underlying physical commodity is sold or delivered. Authoritative guidance about offsetting assets and liabilities requires the fair value of derivative instruments to be shown in the Combined Notes to Consolidated Financial Statements on a gross basis, even when the derivative instruments are subject to legally enforceable master netting agreements and qualify for net presentation in the Consolidated Balance Sheets. A master netting agreement is an agreement between two counterparties that may have derivative and non-derivative contracts with each other providing for the net settlement of all referenced contracts via one payment stream, which takes place as the contracts deliver, when collateral is requested or in the event of default. In the tables below, which present fair value balances, our energy-related economic hedges and proprietary trading derivatives are shown gross. The impact of the netting of fair value balances with the same counterparty that are subject to legally enforceable master netting agreements, as well as netting of cash collateral, including margin on exchange positions, is aggregated in the collateral and netting columns. Our use of cash collateral is generally unrestricted unless we are downgraded below investment grade. Commodity Price Risk We employ established policies and procedures to manage our risks associated with market fluctuations in commodity prices by entering into physical and financial derivative contracts, including swaps, futures, forwards, options, and short-term and long-term commitments to purchase and sell energy and commodity products. We believe these instruments, which are either determined to be non-derivative or classified as economic hedges, mitigate exposure to fluctuations in commodity prices. To the extent the amount of energy we produce or procure differs from the amount of energy we have contracted to sell, we are exposed to market fluctuations in the prices of electricity, natural gas and oil, and other commodities. We use a variety of derivative and non-derivative instruments to manage the commodity price risk of our electric generation facilities, including power and gas sales, fuel and power purchases, natural gas transportation and pipeline capacity agreements, and other energy-related products marketed and purchased. To manage these risks, we may enter into fixed-price derivative or non-derivative contracts to hedge the variability in future cash flows from expected sales of power and gas and purchases of power and fuel. The objectives for executing such hedges include fixing the price for a portion of anticipated future electricity sales at a level that provides an acceptable return. We are also exposed to differences between the locational settlement prices of certain economic hedges and the hedged generating units. This price difference is actively managed through other instruments which include derivative congestion products, whose changes in fair value are recognized in earnings each period, and auction revenue rights, which are accounted for on an accrual basis. Additionally, we are exposed to certain market risks through our proprietary trading activities. The proprietary trading activities are a complement to our energy marketing portfolio but represent a small portion of our overall energy marketing activities and are subject to limits established by our RMC. The following tables provide a summary of the derivative fair value balances recorded as of March 31, 2023 and December 31, 2022: March 31, 2023 Economic Proprietary Collateral (a)(b) Netting (a) Total Mark-to-market derivative assets (current assets) $ 10,189 $ 5 $ 362 $ (8,627) $ 1,929 Mark-to-market derivative assets (noncurrent assets) 4,236 — 153 (3,275) 1,114 Total mark-to-market derivative assets 14,425 5 515 (11,902) 3,043 Mark-to-market derivative liabilities (current liabilities) (10,641) (3) 443 8,628 (1,573) Mark-to-market derivative liabilities (noncurrent liabilities) (4,179) — 205 3,274 (700) Total mark-to-market derivative liabilities (14,820) (3) 648 11,902 (2,273) Total mark-to-market derivative net assets (liabilities) $ (395) $ 2 $ 1,163 $ — $ 770 December 31, 2022 Mark-to-market derivative assets (current assets) $ 15,296 $ 10 $ 161 $ (13,123) $ 2,344 Mark-to-market derivative assets (noncurrent assets) 5,100 — 217 (4,074) 1,243 Total mark-to-market derivative assets 20,396 10 378 (17,197) 3,587 Mark-to-market derivative liabilities (current liabilities) (15,049) (6) 374 13,123 (1,558) Mark-to-market derivative liabilities (noncurrent liabilities) (5,203) — 146 4,074 (983) Total mark-to-market derivative liabilities (20,252) (6) 520 17,197 (2,541) Total mark-to-market derivative net assets (liabilities) $ 144 $ 4 $ 898 $ — $ 1,046 _________ (a) We net all available amounts allowed in our Consolidated Balance Sheets in accordance with authoritative guidance for derivatives. These amounts include unrealized derivative transactions with the same counterparty under legally enforceable master netting agreements and cash collateral. In some cases we may have other offsetting exposures, subject to a master netting or similar agreement, such as trade receivables and payables, transactions that do not qualify as derivatives, letters of credit and other forms of non-cash collateral. These amounts are not material as of March 31, 2023 and December 31, 2022 and not reflected in the tables above. (b) Includes $295 million of variation margin posted and $836 million of variation margin held from the exchanges as of March 31, 2023 and December 31, 2022, respectively. Economic Hedges (Commodity Price Risk) For the three months ended March 31, 2023 and 2022, we recognized the following net pre-tax commodity mark-to-market gains (losses) which are also located in the Net fair value changes related to derivatives line in the Consolidated Statements of Cash Flows. Three Months Ended March 31, 2023 2022 Income Statement Location Gains (Losses) Operating revenues $ 930 $ (919) Purchased power and fuel (1,193) 826 Total $ (263) $ (93) In general, increases and decreases in forward market prices have a positive and negative impact, respectively, on owned and contracted generation positions that have not been hedged. For merchant revenues not already hedged via comprehensive state programs, such as the CMC in Illinois, historically we have used a three-year ratable sales plan to align our hedging strategy with our financial objectives. As a result, our prompt three-year merchant revenues have been hedged on an approximate rolling 90%/60%/30% basis. We may also enter into transactions that are outside of this ratable hedging program. As of March 31, 2023, the percentage of expected generation hedged for the Mid-Atlantic, Midwest, New York, and ERCOT reportable segments is 95%-98% and 77%-80% for 2023 and 2024, respectively. Interest Rate and Foreign Exchange Risk We utilize interest rate swaps to manage our interest rate exposure and foreign currency derivatives to manage foreign exchange rate exposure associated with international commodity purchases in currencies other than U.S. dollars, both of which are treated as economic hedges. The notional amounts were $493 million and $524 million as of March 31, 2023 and December 31, 2022, respectively. The following table provides the mark-to-market derivative assets and liabilities as of March 31, 2023 and December 31, 2022: March 31, 2023 December 31, 2022 Economic Netting(a) Total Economic Netting(a) Total Mark-to-market derivative assets (current assets) $ 25 $ (2) $ 23 $ 29 $ (5) $ 24 Mark-to-market derivative assets (noncurrent assets) 11 — 11 18 — 18 Total mark-to-market derivative assets 36 (2) 34 47 (5) 42 Mark-to-market derivative liabilities (current liabilities) (2) 2 — (5) 5 — Mark-to-market derivative liabilities (noncurrent liabilities) — — — — — — Total mark-to-market derivative liabilities (2) 2 — (5) 5 — Total mark-to-market derivative net assets (liabilities) $ 34 $ — $ 34 $ 42 $ — $ 42 _________ (a) We net all available amounts in our Consolidated Balance Sheets in accordance with authoritative guidance for derivatives. These amounts include unrealized derivative transactions with the same counterparty under legally enforceable master netting agreements. The mark-to-market gains and losses associated with management of interest rate and foreign currency exchange rate risk for the three months ended March 31, 2023 and 2022 were not material. Credit Risk We would be exposed to credit-related losses in the event of non-performance by counterparties on executed derivative instruments. The credit exposure of derivative contracts, before collateral, is represented by the fair value of contracts as of the reporting date. For commodity derivatives, we enter into enabling agreements that allow for payment netting with our counterparties, which reduces our exposure to counterparty risk by providing for the offset of amounts payable to the counterparty against amounts receivable from the counterparty. Typically, each enabling agreement is for a specific commodity and, with respect to each individual counterparty, netting is limited to t ransactions involving that specific commodity product, except where master netting agreements exist with a counterparty that allows for cross product netting. In addition to payment netting language in the enabling agreement, our credit department establishes credit limits, margining thresholds and collateral requirements for each counterparty, which are defined in the derivative contracts. Counterparty credit limits are based on an internal credit review process that considers a variety of factors, including the results of a scoring model, leverage, liquidity, profitability, credit ratings by credit rating agencies, and risk management capabilities. To the extent that a counterparty’s margining thresholds are exceeded, the counterparty is required to post collateral with us as specified in each enabling agreement. Our credit department monitors current and forward credit exposure to counterparties and their affiliates, both on an individual and an aggregate basis. The following tables provide information on the credit exposure for all derivative instruments, NPNS and payables and receivables, net of collateral and instruments that are subject to master netting agreements, as of March 31, 2023. The tables further delineate that exposure by credit rating of the counterparties and provide guidance on the concentration of credit risk to individual counterparties. The amounts in the tables below exclude credit risk exposure from individual retail counterparties, nuclear fuel procurement contracts, and exposure through RTOs, ISOs, NYMEX, ICE, NASDAQ, NGX, and Nodal commodity exchanges. Rating as of March 31, 2023 Total Credit Collateral (a) Net Number of Net Exposure of Investment grade $ 950 $ 63 $ 887 — $ — Non-investment grade 8 — 8 — — No external ratings Internally rated — investment grade 179 — 179 — — Internally rated — non-investment grade 325 30 295 — — Total $ 1,462 $ 93 $ 1,369 — $ — Net Credit Exposure by Type of Counterparty As of March 31, 2023 Investor-owned utilities, marketers, power producers $ 1,074 Energy cooperatives and municipalities 174 Financial Institutions 27 Other 94 Total $ 1,369 __________ (a) As of March 31, 2023, credit collateral held from counterparties where we had credit exposure included $41 million of cash and $52 million of letters of credit. The credit collateral does not include non-liquid collateral. Credit-Risk-Related Contingent Features As part of the normal course of business, we routinely enter into physically or financially settled contracts for the purchase and sale of electric capacity, electricity, fuels, emissions allowances, and other energy-related products. Certain of our derivative instruments contain provisions that require us to post collateral. We also enter into commodity transactions on exchanges where the exchanges act as the counterparty to each trade. Transactions on the exchanges must adhere to comprehensive collateral and margining requirements. This collateral may be posted in the form of cash or credit support with thresholds contingent upon our credit rating from each of the major credit rating agencies. The collateral and credit support requirements vary by contract and by counterparty. These credit-risk-related contingent features stipulate that if we were to be downgraded or lose our investment grade credit rating (based on our senior unsecured debt rating), we would be required to provide additional collateral. This incremental collateral requirement allows for the offsetting of derivative instruments that are assets with the same counterparty, where the contractual right of offset exists under applicable master netting agreements. In the absence of expressly agreed-to provisions that specify the collateral that must be provided, collateral requested will be a function of the facts and circumstances of the situation at the time of the demand. In this case, we believe an amount of several months of future payments (i.e., capacity payments) rather than a calculation of fair value is the best estimate for the contingent collateral obligation, which has been factored into the disclosure below. The aggregate fair value of all derivative instruments with credit-risk-related contingent features in a liability position that are not fully collateralized (excluding transactions on the exchanges that are fully collateralized) is detailed in the table below: Credit-Risk-Related Contingent Features March 31, 2023 December 31, 2022 Gross fair value of derivative contracts containing this feature (a) $ (2,683) $ (4,736) Offsetting fair value of in-the-money contracts under master netting arrangements (b) 987 2,048 Net fair value of derivative contracts containing this feature (c) $ (1,696) $ (2,688) __________ (a) Amount represents the gross fair value of out-of-the-money derivative contracts containing credit-risk-related contingent features ignoring the effects of master netting agreements. (b) Amount represents the offsetting fair value of in-the-money derivative contracts under legally enforceable master netting agreements with the same counterparty, which reduces the amount of any liability for which we could potentially be required to post collateral. (c) Amount represents the net fair value of out-of-the-money derivative contracts containing credit-risk-related contingent features after considering the mitigating effects of offsetting positions under master netting arrangements and reflects the actual net liability upon which any potential contingent collateral obligations would be based. As of March 31, 2023 and December 31, 2022, we posted or held the following amounts of cash collateral and letters of credit on derivative contracts with external counterparties, after giving consideration to offsetting derivative and non-derivative positions under master netting agreements. March 31, 2023 December 31, 2022 Cash collateral posted (a) $ 1,898 $ 1,636 Letters of credit posted (a) 672 947 Cash collateral held (a) 755 765 Letters of credit held (a) 71 115 Additional collateral required in the event of a credit downgrade below investment grade (at BB+/Ba1)(b)(c) 2,405 3,337 __________ (a) The cash collateral and letters of credit amounts are inclusive of NPNS contracts. (b) Certain of our contracts contain provisions that allow a counterparty to request additional collateral when there has been a subjective determination that our credit quality has deteriorated, generally termed “adequate assurance.” Due to the subjective nature of these provisions, we estimate the amount of collateral that we may ultimately be required to post in relation to the maximum exposure with the counterparty. (c) The downgrade collateral is inclusive of all contracts in a liability position regardless of accounting treatment. We entered into supply forward contracts with certain utilities with one-sided collateral postings only from us. If market prices fall below the benchmark price levels in these contracts, the utilities are not required to post collateral. However, when market prices rise above the benchmark price levels, counterparty suppliers, including us, are required to post collateral once certain unsecured credit limits are exceeded.

Debt and Credit Agreements

Debt and Credit Agreements	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Debt and Credit Agreements	Debt and Credit Agreements Short-Term Borrowings We meet our short-term liquidity requirements primarily through the issuance of commercial paper. We may use our credit facility for general corporate purposes, including meeting short-term funding requirements and the issuance of letters of credit. Commercial Paper The following table reflects our commercial paper program supported by the revolving credit agreements as of March 31, 2023 and December 31, 2022: Outstanding Commercial Weighted Average Interest Rate on March 31, 2023 December 31, 2022 March 31, 2023 December 31, 2022 $ 205 $ 959 5.09 % 4.90 % Credit Agreements On February 1, 2022, we entered into a new credit agreement establishing a $3.5 billion five-year revolving credit facility at a variable interest rate of SOFR plus 1.275% and on February 9, 2022 we entered into a $1 billion five-year liquidity facility with the primary purpose of supporting our letter of credit issuances. Many of our bilateral credit agreements remain in effect. See below for additional details. As of March 31, 2023, we had the following aggregate bank commitments, credit facility borrowings and available capacity under our respective credit facilities: Available Capacity as of March 31, 2023 Facility Type Aggregate Bank Facility Draws Outstanding Actual To Support Syndicated Revolver $ 3,500 $ — $ 196 $ 3,304 $ 3,099 Bilaterals (a) 1,310 — 785 525 — Liquidity Facility 971 — 576 295 (b) — Project Finance 131 — 108 23 — Total $ 5,912 $ — $ 1,665 $ 4,147 $ 3,099 __________ (a) On January 20, 2023, a bilateral credit agreement initiated on August 24, 2022 decreased from $100 million to $10 million. On March 29, 2023, we initiated a new bilateral credit agreement for $100 million, with a maturity date of March 29, 2025. On January 31, 2023, a bilateral credit agreement initiated on May 15, 2020 increased from $200 million to $250 million, and on March 31, 2023 this agreement increased to $300 million. On April 4, 2023, a bilateral credit agreement initiated on January 5, 2016 was extended for three years to April 3, 2026. (b) The maximum amount of the bank commitment is not to exceed $971 million. The aggregate available capacity of the facility is subject to market fluctuations based on the value of U.S. Treasury Securities which determines the amount of collateral held in the trust. We may post additional collateral to borrow up to the maximum bank commitment. As of March 31, 2023, without posting additional collateral, the actual availability of facility, prior to outstanding letters of credit was $871 million. Short-Term Loan Agreements On March 31, 2020, we entered into a term loan agreement for $300 million. We repaid $100 million of the term loan on March 29, 2022. The remaining $200 million from the loan agreement was renewed on March 29, 2022 and repaid on March 29, 2023. Pursuant to the loan agreement, loans made thereunder bore interest at a variable rate equal to SOFR plus 0.80% and all indebtedness thereunder was unsecured. The loan was reflected in Short-term borrowings in the Consolidated Balance Sheet as of December 31, 2022. On January 26, 2023, we entered into a term loan agreement for $100 million. The loan agreement has an expiration of January 24, 2024. Pursuant to the loan agreement, loans made thereunder bear interest at a variable rate equal to SOFR plus 0.8% and all indebtedness thereunder is unsecured. The loan was reflected in Short-term borrowings in the Consolidated Balance Sheet as of March 31, 2023. On February 9, 2023, we entered into a term loan agreement for $400 million. The loan agreement has an expiration of February 8, 2024. Pursuant to the loan agreement, loans made thereunder bear interest at a variable rate equal to SOFR plus 1.05% and all indebtedness thereunder is unsecured. The loan was reflected in Short-term borrowings in the Consolidated Balance Sheet as of March 31, 2023. Long-Term Debt Debt Issuances and Redemptions During the three months ended March 31, 2023, the following long-term debt was issued: Type Interest Rate Maturity Amount Use of Proceeds 2028 Senior Notes 5.60 % March 1, 2028 $ 750 To fund general corporate purposes, including repayment of short-term borrowings 2033 Senior Notes 5.80 % March 1, 2033 600 To fund general corporate purposes, including repayment of short-term borrowings Energy Efficiency Project Financing (a) 2.20% - 4.96% May 31, 2023 - May 1, 2024 3 Funding to install energy conservation measures __________ (a) For Energy Efficiency Project Financing, the maturity dates represent the expected date of project completion, upon which the respective customer assumes the outstanding debt. On April 3, 2023, we completed separate reofferings for six issues of tax-exempt pollution control revenue refunding bonds (the Bonds) totaling, in the aggregate, $435 million in principal amount. The Bonds bear interest at term rates ranging from 4.10% to 4.45%. The proceeds will be used to fund general corporate purposes, including repayment of short-term borrowings. During the three months ended March 31, 2023, the following long-term debt was redeemed: Type Interest Rate Maturity Amount Continental Wind Nonrecourse Debt 6.00% February 28, 2033 $ 15 West Medway II Nonrecourse Debt 1 month LIBOR + 2.875% March 31, 2026 7 Antelope Valley DOE Nonrecourse Debt 2.29% - 3.56% January 5, 2037 6 RPG Nonrecourse Debt 4.11% March 31, 2035 2 Long-Term Debt from Affiliates In connection with the debt obligations assumed by Exelon as part of the 2012 merger, Exelon and our subsidiaries assumed intercompany loan agreements that mirror the terms and amounts of the third-party debt obligations of Exelon, resulting in intercompany notes payable to Exelon. In connection with the separation, on January 31, 2022, we paid cash to Exelon Corporate in the amount of $258 million to settle the intercompany loan with the difference of $61 million recorded to membership interest. Debt Covenants As of March 31, 2023, we are in compliance with all debt covenants.

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities	Fair Value of Financial Assets and Liabilities We measure and classify fair value measurements in accordance with the hierarchy as defined by GAAP. The hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three levels as follows: • Level 1 — quoted prices (unadjusted) in active markets for identical assets or liabilities that we have the ability to liquidate as of the reporting date. • Level 2 — inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data. • Level 3 — unobservable inputs, such as internally developed pricing models or third-party valuations for the asset or liability due to little or no market activity for the asset or liability. Fair Value of Financial Liabilities Recorded at Amortized Cost The following table presents the carrying amounts and fair values of the short-term liabilities, long-term debt, and the SNF obligation as of March 31, 2023 and December 31, 2022. We have no financial liabilities classified as Level 1. The carrying amounts of the short-term liabilities as presented in the Consolidated Balance Sheets are representative of their fair value (Level 2) because of the short-term nature of these instruments. March 31, 2023 December 31, 2022 Carrying Amount Fair Value Carrying Amount Fair Value Level 2 Level 3 Total Level 2 Level 3 Total Long-term debt, including amounts due within one year $ 5,924 $ 5,123 $ 861 $ 5,984 $ 4,609 $ 3,688 $ 859 $ 4,547 SNF Obligation 1,244 1,082 — 1,082 1,230 1,021 — 1,021 Valuation Techniques Used to Determine Fair Value Our valuation techniques used to measure the fair value of the assets and liabilities are in accordance with the policies discussed in Note 18 — Fair Value of Financial Assets and Liabilities of our 2022 Form 10-K. Valuation Techniques Used to Determine Net Asset Value Certain NDT Fund Investments are not classified within the fair value hierarchy and are included under the heading “Not subject to leveling” in the table below. These investments are measured at fair value using NAV per share as a practical expedient and include commingled funds, mutual funds which are not publicly quoted, managed private credit funds, private equity and real estate funds. For commingled funds and mutual funds, which are not publicly quoted, the fair value is primarily derived from the quoted prices in active markets on the underlying securities and can typically be redeemed monthly with 30 or less days of notice and without further restrictions. For managed private credit funds, the fair value is determined using a combination of valuation models including cost models, market models, and income models and typically cannot be redeemed until maturity of the term loan. Private equity and real estate investments include those in limited partnerships that invest in operating companies and real estate holding companies that are not publicly traded on a stock exchange, such as, leveraged buyouts, growth capital, venture capital, distressed investments, investments in natural resources, and direct investments in pools of real estate properties. These investments typically cannot be redeemed and are generally liquidated over a period of 8 to 10 years from the initial investment date, which is based on our understanding of the investment funds. Private equity and real estate valuations are reported by the fund manager and are based on the valuation of the underlying investments, which include inputs such as cost, operating results, discounted future cash flows, market based comparable data, and independent appraisals from sources with professional qualifications. These valuation inputs are unobservable. Recurring Fair Value Measurements The following tables present assets and liabilities measured and recorded at fair value in the Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of March 31, 2023 and December 31, 2022: As of March 31, 2023 As of December 31, 2022 Level 1 Level 2 Level 3 Not subject to leveling Total Level 1 Level 2 Level 3 Not subject to leveling Total Assets Cash equivalents (a) $ 30 $ — $ — $ — $ 30 $ 41 $ — $ — $ — $ 41 NDT fund investments Cash equivalents (b) 530 85 — — 615 349 88 — — 437 Equities 3,971 1,592 — 1,144 6,707 3,462 1,498 — 1,421 6,381 Fixed income Corporate debt (c) — 860 266 — 1,126 — 885 264 — 1,149 U.S. Treasury and agencies 1,883 57 — — 1,940 1,996 46 — — 2,042 Foreign governments — 46 — — 46 — 39 — — 39 State and municipal debt — 52 — — 52 — 53 — — 53 Other 22 19 — 1,820 1,861 21 21 — 1,649 1,691 Fixed income subtotal 1,905 1,034 266 1,820 5,025 2,017 1,044 264 1,649 4,974 Private credit — — 155 626 781 — — 159 643 802 Private equity — — — 681 681 — — — 687 687 Real estate — — — 977 977 — — — 1014 1,014 NDT fund investments subtotal (d)(e) 6,406 2,711 421 5,248 14,786 5,828 2,630 423 5,414 14,295 Rabbi trust investments Cash equivalents 1 — — — 1 1 — — — 1 Mutual funds 41 — — — 41 39 — — — 39 Life insurance contracts — 29 1 — 30 — 27 1 — 28 Rabbi trust investments subtotal 42 29 1 — 72 40 27 1 — 68 Investments in equities 5 — — — 5 6 — — — 6 Commodity derivative assets Economic hedges 2,729 7,322 4,410 — 14,461 3,505 11,353 5,585 — 20,443 Proprietary trading — 2 3 — 5 — 4 6 — 10 Effect of netting and allocation of (f)(g) (2,334) (6,397) (2,658) — (11,389) (2,951) (10,348) (3,525) — (16,824) Commodity derivative assets subtotal 395 927 1,755 — 3,077 554 1,009 2,066 — 3,629 DPP consideration — 374 — — 374 — 515 — — 515 Total assets 6,878 4,041 2,177 5,248 18,344 6,469 4,181 2,490 5,414 18,554 Liabilities Commodity derivative liabilities Economic hedges (2,804) (8,099) (3,919) — (14,822) (3,171) (11,498) (5,588) — (20,257) Proprietary trading — (2) (1) — (3) — (4) (2) — (6) Effect of netting and allocation of collateral (f)(g) 2,771 6,869 2,912 — 12,552 3,279 10,700 3,743 — 17,722 Commodity derivative liabilities subtotal (33) (1,232) (1,008) — (2,273) 108 (802) (1,847) — (2,541) Deferred compensation obligation — (57) — — (57) — (57) — — (57) Total liabilities (33) (1,289) (1,008) — (2,330) 108 (859) (1,847) — (2,598) Total net assets (liabilities) $ 6,845 $ 2,752 $ 1,169 $ 5,248 $ 16,014 $ 6,577 $ 3,322 $ 643 $ 5,414 $ 15,956 __________ (a) CEG Parent has $38 million and $49 million of Level 1 cash equivalents as of March 31, 2023 and December 31, 2022, respectively. We exclude cash of $222 million and $390 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $75 million and $70 million as of March 31, 2023 and December 31, 2022, respectively. CEG Parent excludes an additional $1 million and $19 million of cash as of March 31, 2023 and December 31, 2022, respectively. (b) Includes $106 million and $99 million of cash received from outstanding repurchase agreements as of March 31, 2023 and December 31, 2022, respectively, and is offset by an obligation to repay upon settlement of the agreement as discussed in (e) below. (c) Includes investments in equities sold short of ($46) million and ($45) million as of March 31, 2023 and December 31, 2022, respectively, held in an investment vehicle primarily to hedge the equity option component of convertible debt. (d) Includes net derivative assets of less than $1 million and $1 million, which have total notional amounts of $530 million and $494 million as of March 31, 2023 and December 31, 2022, respectively. The notional principal amounts for these instruments provide one measure of the transaction volume outstanding as of the periods ended and do not represent the amount of our exposure to credit or market loss. (e) Excludes net liabilities of $110 million and $168 million as of March 31, 2023 and December 31, 2022, respectively, which include certain derivative assets that have notional amounts of $163 million and $59 million as of March 31, 2023 and December 31, 2022, respectively. These items consist of receivables related to pending securities sales, interest and dividend receivables, repurchase agreement obligations, and payables related to pending securities purchases. The repurchase agreements are generally short-term in nature with durations generally of 30 days or less. (f) Net collateral posted to counterparties totaled $437 million, $472 million, and $254 million allocated to Level 1, Level 2, and Level 3 mark-to-market derivatives, respectively, as of March 31, 2023. Net collateral posted to counterparties totaled $328 million, $352 million, and $218 million allocated to Level 1, Level 2, and Level 3 mark-to-market derivatives, respectively, as of December 31, 2022. (g) Includes $295 million of variation margin posted and $836 million of variation margin held from the exchanges as of March 31, 2023 and December 31, 2022, respectively. As of March 31, 2023, we have outstanding commitments to invest in private credit, private equity, and real estate investments of $231 million, $126 million, and $376 million, respectively. These commitments will be funded by our existing NDT funds. We hold investments without readily determinable fair values with carrying amounts of $56 million and $46 million as of March 31, 2023 and December 31, 2022, respectively. Changes in fair value, cumulative adjustments, and impairments were not material for the three months ended March 31, 2023 and the year ended December 31, 2022. Reconciliation of Level 3 Assets and Liabilities The following tables present the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis during the three months ended March 31, 2023 and 2022: For the Three Months Ended March 31, 2023 NDT Fund Investments Mark-to-Market Life Insurance Contracts Total Balance as of January 1, 2023 $ 423 $ 219 $ 1 $ 643 Total realized / unrealized gains Included in net income — 506 (a) — 506 Change in collateral — 35 — 35 Purchases, sales, issuances and settlements Purchases — 66 — 66 Sales — (4) — (4) Settlements (2) — — (2) Transfers into Level 3 — (8) (b) — (8) Transfers out of Level 3 — (67) (b) — (67) Balance as of March 31, 2023 $ 421 $ 747 $ 1 $ 1,169 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of March 31, 2023 $ — $ 712 $ — $ 712 For the Three Months Ended March 31, 2022 NDT Fund Investments Mark-to-Market Life Insurance Contracts Total Balance as of January 1, 2022 $ 464 $ (94) $ — $ 370 Total realized / unrealized losses Included in net income — (1,011) (a) — (1,011) Included in noncurrent payables to affiliates (2) — — (2) Change in collateral — (262) (262) Impacts of separation — — 3 3 Purchases, sales, issuances and settlements Purchases — 49 — 49 Sales — (26) — (26) Settlements — — — — Transfers into Level 3 — 101 (b) — 101 Transfers out of Level 3 — (35) (b) — (35) Balance as of March 31, 2022 $ 462 $ (1,278) $ 3 $ (813) The amount of total losses included in income attributed to the change in unrealized losses related to assets and liabilities as of March 31, 2022 $ — $ (1,019) $ — $ (1,019) __________ (a) Includes a reduction of $206 million for realized gains and an addition of $8 million for realized losses due to the settlement of derivative contracts for the three months ended March 31, 2023, and 2022 respectively. (b) Transfers into and out of Level 3 generally occur when the contract tenor becomes less or more observable, respectively, primarily due to changes in market liquidity or assumptions for certain commodity contracts. The following tables present the income statement classification of the total realized and unrealized gains (losses) included in income for Level 3 assets and liabilities measured at fair value on a recurring basis during the three months ended March 31, 2023 and 2022: For the Three Months Ended March 31, Operating Purchased Other, net 2023 2022 2023 2022 2023 2022 Total gains (losses) included in net income $ 547 $ (1,021) $ (41) $ 10 $ — $ — Total unrealized gains (losses) 839 (1,221) (127) 202 — — Mark-to-Market Derivatives The following table presents the significant inputs to the forward curve used to value level 3 mark-to-market derivative positions: Type of trade Fair Value as of March 31, 2023 Fair Value as of December 31, 2022 Valuation Unobservable 2023 Range & Arithmetic Average 2022 Range & Arithmetic Average Mark-to-market derivatives—Economic hedges (a)(b) $ 491 $ (3) Discounted Cash Flow Forward power $(0.75) - $196 $55 $0.63 - $283 $72 Forward gas $1.75 - $17 $4.01 $1.67 - $26 $4.57 Option Volatility 114% - 119% 116% 97% - 119% 111% __________ (a) The valuation techniques, unobservable inputs, ranges, and arithmetic averages are the same for the asset and liability positions. (b) The fair values do not include cash collateral posted on level 3 positions of $254 million and $218 million as of March 31, 2023 and December 31, 2022, respectively. The inputs listed above, which are as of the balance sheet date, would have a direct impact on the fair values of the above instruments if they were adjusted. The significant unobservable inputs used in the fair value measurement of our commodity derivatives are forward commodity prices and price volatility for options. Increases (decreases) in the forward commodity price in isolation would result in significantly higher (lower) fair values for long positions (contracts that give us the obligation or option to purchase a commodity), with offsetting impacts to short positions (contracts that give us the obligation or right to sell a commodity). Increases (decreases) in volatility would increase (decrease) the value for the holder of the option (writer of the option). Generally, a change in the estimate of forward commodity prices is unrelated to a change in the estimate of volatility of prices. An increase to the heat rate or renewable factors would increase the fair value accordingly. Generally, interrelationships exist between market prices of natural gas and power; i.e. an increase in natural gas pricing would have a similar impact on forward power markets. See Note 9 — Derivative Financial Instruments for additional information on mark-to-market derivatives.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Commercial Commitments. Commercial commitments as of March 31, 2023, representing commitments potentially triggered by future events, were as follows: Expiration within Total 2023 2024 2025 2026 2027 2028 and beyond Letters of credit $ 1,665 $ 1,382 $ 245 $ — $ — $ 38 $ — Surety bonds (a) 986 842 144 — — — — Total commercial commitments $ 2,651 $ 2,224 $ 389 $ — $ — $ 38 $ — __________ (a) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds. Environmental Remediation Matters General. Our operations have in the past, and may in the future, require substantial expenditures to comply with environmental laws. Additionally, under Federal and state environmental laws, we are generally liable for the costs of remediating environmental contamination of property now or formerly owned by us and of property contaminated by hazardous substances generated by us. We own or lease several real estate parcels, including parcels on which our operations or the operations of others may have resulted in contamination by substances that are considered hazardous under environmental laws. In addition, we are currently involved in proceedings relating to sites where hazardous substances have been deposited and may be subject to additional proceedings in the future. Unless otherwise disclosed, we cannot reasonably estimate whether we will incur significant liabilities for additional investigation and remediation costs at these or additional sites identified by us, environmental agencies, or others. Additional costs could have a material, unfavorable impact on our financial statements. We had accrued undiscounted amounts for environmental liabilities of $129 million and $119 million as of March 31, 2023 and December 31, 2022, respectively, in Accrued expenses and Other deferred credits and other liabilities in the Consolidated Balance Sheets. Cotter Corporation. The EPA has advised Cotter Corporation (N.S.L.) (Cotter), a former ComEd subsidiary, that it is potentially liable in connection with radiological contamination at two sites in Missouri. In 2000, ComEd sold Cotter to an unaffiliated third-party. As part of the sale, ComEd agreed to indemnify Cotter for any liability arising from these two Missouri superfund sites, West Lake Landfill and Latty Avenue. In connection with Exelon’s 2001 corporate restructuring, this responsibility to indemnify Cotter was transferred to us, and ultimately retained by us per the terms of our separation from Exelon. See Note 1 — Basis of Presentation for additional information on the separation and Note 19 - Commitments and Contingencies of our 2022 Form 10-K for additional information on the West Lake Landfill. Latty Avenue and Vicinity Properties. In August 2011, Cotter was notified by the DOJ that Cotter is considered a PRP with respect to the government’s clean-up costs for contamination attributable to low level radioactive residues at a former storage and reprocessing facility named Latty Avenue near St. Louis, Missouri. Latty Avenue was investigated and remediated by the United States Army Corps of Engineers pursuant to funding under the Formerly Utilized Sites Remedial Action Program. On August 3, 2020, the DOJ advised Cotter that it is seeking approximately $90 million from all the PRPs. In December 2021, a good faith offer was submitted to the government. After subsequent communications with DOJ, Cotter proposed, and DOJ agreed to consider mediation to facilitate a settlement. Pursuant to a series of agreements since 2011, the DOJ and Cotter have extended the Statute of Limitations through August 31, 2023. We have determined that a loss associated with this matter is probable and have recorded an estimated liability, included in the total amount as discussed above, that reflects management's best estimate of Cotter's allocable share of the cost. It is reasonably possible that Cotter's allocable share could differ significantly, which could have a material impact on our consolidated financial statements. In April 2023, Cotter was informed by the DOJ about potential additional liability for all PRPs of approximately $90 million associated with the Latty Avenue site as well as certain allegedly contaminated properties in the vicinity of Latty Avenue, for which the government claims that Cotter is a PRP. We are in the process of obtaining additional information from the DOJ to evaluate this potential liability. It is reasonably possible that Cotter's allocable share could have a material unfavorable impact on our consolidated financial statements. Litigation and Regulatory Matters Asbestos Personal Injury Claims. We maintain a reserve for claims associated with asbestos-related personal injury actions at certain facilities that are currently owned by us or were previously owned by ComEd, PECO, or BGE. The estimated liabilities are recorded on an undiscounted basis and exclude the estimated legal costs associated with handling these matters, which could be material. At March 31, 2023 and December 31, 2022, we recorded estimated liabilities of approximately $91 million and $95 million, respectively, in total for asbestos-related bodily injury claims. As of March 31, 2023, approximately $23 million of this amount related to 257 open claims presented to us, while the remaining $68 million is for estimated future asbestos-related bodily injury claims anticipated to arise through 2055, based on actuarial assumptions and analyses, which are updated on an annual basis. On a quarterly basis, we monitor actual experience against the number of forecasted claims to be received and expected claim payments and evaluate whether adjustments to the estimated liabilities are necessary. Impacts of the February 2021 Extreme Cold Weather Event and Texas-based Generating Assets Outages. Beginning on February 15, 2021, our Texas-based generating assets within the ERCOT market, specifically Colorado Bend II, Wolf Hollow II, and Handley, experienced outages as a result of extreme cold weather conditions. In addition, those weather conditions drove increased demand for service, dramatically increased wholesale power prices, and also increased gas prices in certain regions. See Note 2 — Regulatory Matters for additional information. Various lawsuits have been filed against us since March 2021 related to these events, including: • On March 5, 2021, we, along with more than 150 power generators and transmission and distribution companies, were sued by approximately 160 individually named plaintiffs, purportedly on behalf of all Texans who allegedly suffered loss of life or sustained personal injury, property damage or other losses as a result of the weather events. The plaintiffs alleged that the defendants failed to properly prepare for the cold weather and failed to properly conduct their operations, seeking compensatory as well as punitive damages. Thereafter, numerous other plaintiffs filed multiple lawsuits against more than 300 defendants, including us, involving similar allegations of liability and claims of personal injury and property damage all arising out of the February weather events. These additional lawsuits allege wrongful death, property damage, or other losses. Co-defendants in these lawsuits include ERCOT, transmission and distribution utilities and other generators. On December 28, 2021, approximately 130 insurance companies which insured Texas homeowners and businesses filed a subrogation lawsuit against multiple defendants alleging that defendants were at fault for the energy failure that resulted from the winter storm, causing significant property damage to the insureds. Subsequently, several hundred other insurance companies filed similar claims. All of these cases were combined in a Multi-District-Litigation (MDL) pending in Texas state court, which established a bellwether process to consider initial motions to dismiss by the different industry groups of defendants. Defendants filed Motions to Dismiss the amended complaints in five bellwether cases in July 2022. Briefing was completed in September 2022, and oral argument was held on October 11 and 12, 2022. On February 3, 2023, the court granted the motions to dismiss pertaining to us in part and denied them in part, leaving the plaintiffs' negligence and nuisance claims to proceed. As a result, we remain a defendant in the lawsuits, although we, along with the other generators, have sought relief from the court of appeals in Texas. Since the motions to dismiss were partially denied, thousands of new claimants, many in multiple mass tort actions, have filed lawsuits in various Texas state courts naming us, among other defendants. The expectation is these lawsuits will be transferred to the MDL. To date, we have been served with only some of the newly filed claims, many of which appear to be duplicative of previous lawsuits. Once reconstituted, the MDL is expected to now involve over 200 cases brought by over 16,000 plaintiffs, including more than 500 insurance companies, and we are defendants in the majority of them. We dispute liability and deny that we are responsible for any of plaintiffs’ alleged claims and are vigorously contesting them. No loss contingencies have been reflected in the consolidated financial statements with respect to these matters, nor can we currently estimate a range of loss. It is reasonably possible, however, that resolution of these matters could have a material, unfavorable impact on our consolidated financial statements. General. We are involved in various other litigation matters that are being defended and handled in the ordinary course of business. The assessment of whether a loss is probable or reasonably possible, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. We maintain accruals for such losses that are probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of reasonably possible loss, particularly where (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss.

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2023
Equity [Abstract]
Shareholders' Equity	Shareholders' Equity Share Repurchase Program (CEG Parent) On February 16, 2023, as part of our capital allocation plan, our Board of Directors announced a share repurchase program with a $1 billion purchase authority without expiration. Share repurchases may be made through a variety of methods, which may include open market or privately negotiated transactions, provided that the amounts spent do not exceed what is authorized. Any repurchased shares are constructively retired and cancelled. The program does not obligate us to acquire a minimum number of shares during any period and our repurchase of CEG's common stock may be limited, suspended, or discounted at any time at our discretion and without prior notice. Repurchases under this program commenced in March 2023. During the three months ended March 31, 2023, we repurchased from the open market 3.2 million shares of our common stock for a total cost of $251 million at an average price per share of $76.73. As of March 31, 2023, there was $749 million of remaining authority to repurchase shares. No other repurchase plans or programs have been authorized by our Board of Directors. Changes in Accumulated Other Comprehensive Loss (All Registrants) The following tables present changes in AOCI, net of tax, by component: Three Months Ended March 31, 2023 Losses on Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items(a) Foreign Currency Items Total Beginning balance $ (9) $ (1,725) $ (26) $ (1,760) OCI before reclassifications — (53) — (53) Amounts reclassified from AOCI — 5 — 5 Net current-period OCI — (48) — (48) Ending balance $ (9) $ (1,773) $ (26) $ (1,808) Three Months Ended March 31, 2022 Losses on Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items(a) Foreign Currency Items Total Beginning balance $ (8) $ — $ (23) $ (31) Separation-related adjustments — (2,006) — (2,006) OCI before reclassifications — — 4 4 Amounts reclassified from AOCI — 17 — 17 Net current-period OCI — (1,989) 4 (1,985) Ending balance $ (8) $ (1,989) $ (19) $ (2,016) __________ (a) AOCI amounts are included in the computation of net periodic pension and OPEB cost. See Note 8 — Retirement Benefits for additional information. See our Statements of Operations and Comprehensive Income for individual components of AOCI. The following table presents income tax (expense) benefit allocated to each component of our other comprehensive loss: Three Months Ended March 31, 2023 2022 Pension and non-pension postretirement benefit plans: Actuarial loss reclassified to periodic benefit cost $ (2) $ (6) Pension and non-pension postretirement benefit plans valuation adjustment 18 680

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2023
Variable Interest Entity [Abstract]
Variable Interest Entities	Variable Interest Entities At March 31, 2023 and December 31, 2022, we consolidated several VIEs or VIE groups for which we are the primary beneficiary (see Consolidated VIEs below) and had significant interests in several other VIEs for which we do not have the power to direct the entities’ activities and, accordingly, we were not the primary beneficiary (see Unconsolidated VIEs below). Consolidated and unconsolidated VIEs are aggregated to the extent that the entities have similar risk profiles. Consolidated VIEs The table below shows the carrying amounts and classification of the consolidated VIEs’ assets and liabilities included in the consolidated financial statements as of March 31, 2023 and December 31, 2022. The assets, except as noted in the footnotes to the table below, can only be used to settle obligations of the VIEs. The liabilities, except as noted in the footnotes to the table below, are such that creditors, or beneficiaries, do not have recourse to our general credit. March 31, 2023 December 31, 2022 Cash and cash equivalents $ 55 $ 51 Restricted cash and cash equivalents 32 46 Accounts receivable Customer 27 20 Other 7 9 Inventories, net Materials and supplies 13 12 Other current assets 406 549 Total current assets 540 687 Property, plant and equipment, net 1,977 1,965 Other noncurrent assets 184 190 Total noncurrent assets 2,161 2,155 Total assets (a) $ 2,701 $ 2,842 Long-term debt due within one year $ 61 $ 60 Accounts payable 42 17 Accrued expenses 11 23 Other current liabilities 1 2 Total current liabilities 115 102 Long-term debt 741 764 Asset retirement obligations 175 173 Other noncurrent liabilities 3 3 Total noncurrent liabilities 919 940 Total liabilities (b) $ 1,034 $ 1,042 __________ (a) Our balances include unrestricted assets f or current unamortized energy contract assets of $23 million and $23 million, disclosed within other current assets in the table above, noncurrent unamortized energy contract assets of $172 million and $178 million, disclosed within other noncurrent assets in the table above as of March 31, 2023 and December 31, 2022, respectively. (b) Our balances include liabilities with recourse of $1 million as of March 31, 2023 and December 31, 2022. As of March 31, 2023 and December 31, 2022, our consolidated VIEs included the following: Consolidated VIE or VIE groups: Reason entity is a VIE: Reason we are the primary beneficiary: CRP - A collection of wind and solar project entities. We have a 51% equity ownership in CRP. See additional discussion below. Similar structure to a limited partnership and the limited partners do not have kick out rights with respect to the general partner. We conduct the operational activities. Bluestem Wind Energy Holdings, LLC - A Tax Equity structure which is consolidated by CRP. Similar structure to a limited partnership and the limited partners do not have kick out rights with respect to the general partner. We conduct the operational activities. Antelope Valley - A solar generating facility, which is 100% owned by us. Antelope Valley sells all of its output to PG&E through a PPA. The PPA contract absorbs variability through a performance guarantee. We conduct all activities. NER - A bankruptcy remote, special purpose entity which is 100% owned by us, which purchases certain of our customer accounts receivable arising from the sale of retail electricity. NER’s assets will be available first and foremost to satisfy the claims of the creditors of NER. Refer to Note 5 —Accounts Receivable for additional information on the sale of receivables. Equity capitalization is insufficient to support its operations. We conduct all activities. CRP - CRP is a collection of wind and solar project entities and some of these project entities are VIEs that are consolidated by CRP. While we or CRP own 100% of the solar entities and 100% of the majority of the wind entities, it has been determined that the wholly owned solar and wind entities are VIEs because the entities' customers absorb price variability from the entities through fixed price power and/or REC purchase agreements. Additionally, for the wind entities that have minority interests, it has been determined that these entities are VIEs because the governance rights of some investors are not proportional to their financial rights. We are the primary beneficiary of these solar and wind entities that qualify as VIEs because we control operations and direct all activities of the facilities. There is limited recourse to us related to certain solar and wind entities. In 2017, our interests in CRP were contributed to and are pledged for the CR non-recourse debt project financing structure. Refer to Note 17 — Debt and Credit Agreements of our 2022 Form 10-K for additional information. Unconsolidated VIEs Our variable interests in unconsolidated VIEs generally include equity investments and energy purchase and sale contracts. For the equity investments, the carrying amount of the investments is reflected in the Consolidated Balance Sheets in Investments. For the energy purchase and sale contracts (commercial agreements), the carrying amount of assets and liabilities in the Consolidated Balance Sheets that relate to our involvement with the VIEs are predominantly related to working capital accounts and generally represent the amounts owed by, or owed to, us for the deliveries associated with the current billing cycles under the commercial agreements. As of March 31, 2023 and December 31, 2022, we had significant unconsolidated variable interests in several VIEs for which we were not the primary beneficiary. These interests include certain equity method investments and certain commercial agreements. The following table presents summary information about our significant unconsolidated VIE entities: March 31, 2023 December 31, 2022 Commercial Equity Total Commercial Equity Total Total assets (a) $ 713 $ — $ 713 $ 715 $ — $ 715 Total liabilities (a) 63 — 63 54 — 54 Our ownership interest in VIE (a) — — — — — — Other ownership interests in VIE (a) 650 — 650 661 — 661 __________ (a) These items represent amounts on the unconsolidated VIE balance sheets, not in the Consolidated Balance Sheets. These items are included to provide information regarding the relative size of the unconsolidated VIEs. We do not have any exposure to loss as we do not have a carrying amount in the equity investment VIEs as o f March 31, 2023 and December 31, 2022. As of March 31, 2023 and December 31, 2022 the unconsolidated VIEs consist of: Unconsolidated VIE groups: Reason entity is a VIE: Reason we are not the primary beneficiary: Equity investments in distributed energy companies. We sold this investment in the fourth quarter of 2022 resulting in it no longer being classified as an unconsolidated VIE. Similar structures to a limited partnership and the limited partners do not have kick-out rights with respect to the general partner. We do not conduct the operational activities. Energy Purchase and Sale agreements - We have several energy purchase and sale agreements with generating facilities. PPA contracts that absorb variability through fixed pricing. We do not conduct the operational activities.

Supplemental Financial Informat

Supplemental Financial Information	3 Months Ended
	Mar. 31, 2023
Supplemental Financial Information [Abstract]
Supplemental Financial Information	Supplemental Financial Information Supplemental Statement of Operations Information The following tables provide additional information about material items recorded in the Consolidated Statements of Operations and Comprehensive Income. Operating revenues Three Months Ended March 31, 2023 2022 Operating lease income $ 4 $ 4 Variable lease income 58 56 Taxes other than income taxes Three Months Ended March 31, 2023 2022 Gross receipts (a) $ 33 $ 30 Property 56 70 Payroll 34 33 __________ (a) Represent gross receipts taxes related to our retail operations. The offsetting collection of gross receipts taxes from customers is recorded in Operating revenues in the Consolidated Statements of Operations and Comprehensive Income. Other, net Three Months Ended March 31, 2023 2022 Decommissioning-related activities: Net realized income on NDT funds (a) Regulatory Agreement Units $ 314 $ 174 Non-Regulatory Agreement Units 194 85 Net unrealized (losses) gains on NDT funds Regulatory Agreement Units 29 (537) Non-Regulatory Agreement Units 18 (337) Regulatory offset to NDT fund-related activities (b) (275) 291 Decommissioning-related activities 280 (324) Investment Income 16 3 Non-service net periodic benefit credit (c) 14 18 Net realized and unrealized losses from equity investments (5) (20) __________ (a) Realized income includes interest, dividends and realized gains and losses on sales of NDT fund investments. (b) Includes the elimination of decommissioning-related activities and the elimination of income taxes related to all NDT fund activity for the Regulatory Agreement Units. (c) Prior to separation, we were allocated our portion of pension and OPEB non-service credits (costs) from Exelon, which was included in Operating and maintenance expense. Effective February 1, 2022, the non-service credit (cost) components are included in Other, net, in accordance with single employer plan accounting. See Note 8 — Retirement Benefits for additional information. Supplemental Cash Flow Information The following tables provide additional information about material items recorded within our Consolidated Statements of Cash Flows. Depreciation, amortization and accretion Three Months Ended March 31, 2023 2022 Property, plant, and equipment (a) $ 262 $ 270 Amortization of intangible assets, net (a) 5 10 Amortization of energy contract assets and liabilities (b) 9 9 Nuclear fuel (c) 186 181 ARO accretion (d) 143 132 Total depreciation, amortization, and accretion $ 605 $ 602 __________ (a) Included in Depreciation and amortization expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Included in Operating revenues or Purchased power and fuel expense in the Consolidated Statements of Operations and Comprehensive Income. (c) Included in Purchased power and fuel expense in the Consolidated Statements of Operations and Comprehensive Income. (d) Included in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. Other non-cash operating activities CEG Parent Constellation Three Months Ended March 31, Three Months Ended March 31, 2023 2022 2023 2022 Pension and non-pension postretirement benefit costs $ 12 $ 7 $ 12 $ 7 Other decommissioning-related activity (a) (136) 6 (136) 6 Energy-related options (b) 93 188 93 188 Long-term incentive plan 12 9 — — Amortization of operating ROU asset 8 17 8 17 Loss on sale of receivables 20 10 20 10 Fair value adjustments related to gas imbalances 31 26 31 26 __________ (a) Includes the elimination of decommissioning-related activities for the Regulatory Agreement Units, including the elimination of operating revenues, ARO accretion, ARC amortization, investment income, and income taxes related to all NDT fund activity for these units. (b) Includes option premiums reclassified to realized at the settlement of the underlying contracts and recorded to results of operations. The following table provides a reconciliation of cash, restricted cash, and cash equivalents reported within our Consolidated Balance Sheets that sum to the total of the same amounts in the Consolidated Statements of Cash Flows. CEG Parent Constellation March 31, 2023 Cash and cash equivalents $ 237 $ 236 Restricted cash and cash equivalents 99 91 Total cash, restricted cash, and cash equivalents $ 336 $ 327 December 31, 2022 Cash and cash equivalents $ 422 $ 403 Restricted cash and cash equivalents 106 98 Total cash, restricted cash, and cash equivalents $ 528 $ 501 March 31, 2022 Cash and cash equivalents $ 1,605 $ 1,605 Restricted cash and cash equivalents 91 79 Total cash, restricted cash, and cash equivalents $ 1,696 $ 1,684 December 31, 2021 Cash and cash equivalents $ 504 $ 504 Restricted cash and cash equivalents 72 72 Total cash, restricted cash, and cash equivalents $ 576 $ 576 For additional information on restricted cash see Note 1 — Basis of Presentation of our 2022 Form 10-K. Supplemental Balance Sheet Information The following table provides additional information about material items recorded within our Consolidated Balance Sheets. Accrued expenses March 31, 2023 CEG Parent Constellation Compensation-related accruals (a) $ 274 $ 220 Taxes accrued 327 325 December 31, 2022 Compensation-related accruals (a) $ 540 $ 502 Taxes accrued 257 257 __________ (a) Primarily includes accrued payroll, bonuses and other incentives, vacation, and benefits.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Prior to completion of the separation on February 1, 2022, we engaged in transactions with affiliates of Exelon in the normal course of business, these affiliate transactions are summarized in the tables below. After February 1, 2022, all transactions with Exelon or its affiliates are no longer related party transactions. Operating Revenues from Affiliates The following table presents our Operating revenues from affiliates: Three Months Ended March 31, 2022 (a) ComEd (b) $ 58 PECO (b) 33 BGE (b) 18 PHI 51 Pepco (b) 39 DPL (b) 10 ACE (b) 2 Total operating revenues from affiliates $ 160 __________ (a) Represents only January 2022 activity prior to separation on February 1, 2022. (b) See Note 24 - Related Party Transactions of our 2022 Form 10-K for additional information on the Exelon utility subsidiaries. Service Company Costs for Corporate Support We received a variety of corporate support services from Exelon. Through its business services subsidiary, BSC, Exelon provided support services at cost, including legal, human resources, financial, information technology, and supply management services. The costs of BSC were directly charged or allocated to us. Certain of these services continue after the separation and are covered by the TSA. The operating and maintenance service company costs from affiliates allocated to us prior to the separation were $44 million for the three months ended March 31, 2022. The capitalized service company costs allocated to us prior to the separation were $15 million for the three months ended March 31, 2022. See Note 1 — Basis of Presentation for additional information on the separation from Exelon.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation On February 21, 2021, the board of directors of Exelon authorized management to pursue a plan to separate its competitive generation and customer-facing energy businesses (separation), conducted through Constellation Energy Generation, LLC (“Constellation”, formerly Exelon Generation Company, LLC) and its subsidiaries, into an independent, publicly-traded company. CEG Parent, a direct, wholly owned subsidiary of Exelon, was newly formed for the purpose of consummating the separation and had not engaged in any business activities nor had any assets or liabilities prior to the separation. On February 1, 2022, the separation was completed and CEG Parent holds all the interests in Constellation previously held by Exelon. As an individual registrant, Constellation has historically filed consolidated financial statements to reflect its financial position and operating results as a stand-alone, wholly owned subsidiary of Exelon. The accompanying Consolidated Financial Statements as of March 31, 2023 and for the three months ended March 31, 2023 and 2022 are unaudited but, in our opinion include all adjustments that are considered necessary for a fair statement of the financial statements in accordance with GAAP. All adjustments are of a normal, recurring nature, except as otherwise disclosed. The Consolidated Financial Statements include the accounts of our subsidiaries and all intercompany transactions have been eliminated. CEG Parent's prior period financial statements have been adjusted to reflect the balances of Constellation in accordance with applicable guidance. Constellation's December 31, 2022 Consolidated Balance Sheet was derived from audited financial statements. The interim financial statements are to be read in conjunction with prior annual financial statements and notes. Financial results for interim periods are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2023. These Combined Notes to Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Amounts disclosed relate to CEG Parent and Constellation unless specifically noted as relating to CEG Parent only. Unless otherwise indicated or the context otherwise requires, references herein to the terms “we,” “us,” and “our” refer collectively to CEG Parent and Constellation.
Separation from Exelon	Separation from Exelon On February 1, 2022, Exelon completed the separation through a pro-rata distribution of all of the outstanding shares of CEG Parent's common stock, no par value, on the basis of one such share for every three shares of Exelon common stock held on January 20, 2022, the record date of the distribution. CEG Parent is an independent, publicly traded company listed on the Nasdaq Stock Market under the symbol “CEG”, and regular-way trading began on February 2, 2022. Exelon no longer retains any ownership interest in CEG Parent or Constellation. Prior to completion of the separation, our financial statements include certain transactions with affiliates of Exelon, which are disclosed as related party transactions. After February 1, 2022, all transactions with Exelon or its affiliates are no longer related party transactions.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Contract with Customer, Contract Asset, Contract Liability, and Receivable	The following table provides a rollforward of the contract assets reflected in the Consolidated Balance Sheets for the three months ended March 31, 2023 and 2022. Contract Assets Balance as of December 31, 2022 $ 130 Amounts reclassified to receivables (11) Revenues recognized 31 Balance as of March 31, 2023 $ 150 Balance as of December 31, 2021 $ 149 Amounts reclassified to receivables (16) Revenues recognized 9 Balance as of March 31, 2022 $ 142 The following table provides a rollforward of the contract liabilities reflected in the Consolidated Balance Sheets for the three months ended March 31, 2023 and 2022. Contract Liabilities Balance as of December 31, 2022 $ 47 Consideration received or due 131 Revenues recognized (115) Balance as of March 31, 2023 $ 63 Balance as of December 31, 2021 $ 75 Consideration received or due 50 Revenues recognized (63) Balance as of March 31, 2022 $ 62
Contract with Customer, Prior Year Contract Revenues Recognized in Current Year	The following table reflects revenues recognized in the three months ended March 31, 2023 and 2022, which were included in contract liabilities at December 31, 2022 and 2021, respectively: Three Months Ended March 31, 2023 2022 Revenues recognized $ 10 $ 28
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table shows the amounts of future revenues expected to be recorded in each year for performance obligations that are unsatisfied or partially unsatisfied as of March 31, 2023. This disclosure only includes contracts for which the total consideration is fixed and determinable at contract inception. The average contract term varies by customer type and commodity, but ranges from one month to several years. This disclosure excludes our power and gas sales contracts as they contain variable volumes and/or variable pricing. 2023 2024 2025 2026 2027 and thereafter Total Remaining performance obligations $ 195 $ 82 $ 32 $ 15 $ 136 $ 460

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Revenue from External Customers by Geographic Areas	The following tables disaggregate the revenue recognized from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. The disaggregation of revenues reflects our two primary products of power sales and natural gas sales, with further disaggregation of power sales provided by geographic region. The following tables also show the reconciliation of reportable segment revenues and RNF to our total revenues and RNF for the three months ended March 31, 2023 and 2022. Three Months Ended March 31, 2023 Revenues from external customers Contracts with customers Other (a) Total Intersegment Revenues Total Revenues Mid-Atlantic $ 1,413 $ (137) $ 1,276 $ (31) $ 1,245 Midwest 1,195 (165) 1,030 2 1,032 New York 464 37 501 34 535 ERCOT 200 (32) 168 1 169 Other Power Regions 1,518 279 1,797 (6) 1,791 Total Competitive Businesses Electric Revenues 4,790 (18) 4,772 — 4,772 Competitive Businesses Natural Gas Revenues 895 590 1,485 — 1,485 Competitive Businesses Other Revenues (b) 148 1,160 1,308 — 1,308 Total Consolidated Operating Revenues $ 5,833 $ 1,732 $ 7,565 $ — $ 7,565 Three Months Ended March 31, 2022 Revenues from external customers (c) Contracts with customers Other (a) Total Intersegment Revenues Total Revenues Mid-Atlantic $ 1,154 $ (50) $ 1,104 $ — $ 1,104 Midwest 1,248 (51) 1,197 — 1,197 New York 494 (135) 359 6 365 ERCOT 163 72 235 — 235 Other Power Regions 1,421 512 1,933 (6) 1,927 Total Competitive Businesses Electric Revenues 4,480 348 4,828 — 4,828 Competitive Businesses Natural Gas Revenues 811 634 1,445 — 1,445 Competitive Businesses Other Revenues (b) 86 (768) (682) — (682) Total Consolidated Operating Revenues $ 5,377 $ 214 $ 5,591 $ — $ 5,591 __________ (a) Includes revenues from derivatives and leases. (b) Represents activities not allocated to a region. See text above for a description of included activities. Includes unrealized mark-to-market gains of $929 million and losses of $921 million for the three months ended March 31, 2023 and 2022, respectively, and the elimination of intersegment revenues. (c) Includes all wholesale and retail electric sales to third parties and affiliate sales to Exelon's utility subsidiaries prior to the separation on February 1, 2022. See Note 16 - Related Party Transactions for additional information. Three Months Ended March 31, 2023 Three Months Ended March 31, 2022 RNF from external customers Intersegment RNF Total RNF from external customers (a) Intersegment Total Mid-Atlantic $ 722 $ (31) $ 691 $ 509 $ (1) $ 508 Midwest 690 (1) 689 785 — 785 New York 225 36 261 260 8 268 ERCOT 53 (1) 52 106 (27) 79 Other Power Regions 256 (8) 248 297 (10) 287 Total RNF for Reportable Segments 1,946 (5) 1,941 1,957 (30) 1,927 Other (b) (110) 5 (105) 84 30 114 Total RNF $ 1,836 $ — $ 1,836 $ 2,041 $ — $ 2,041 __________ (a) Includes purchases and sales from/to third parties and affiliate sales to Exelon's utility subsidiaries prior to the separation on February 1, 2022. See Note 16 - Related Party Transactions for additional information. (b) Other represents activities not allocated to a region. See text above for a description of included activities. Primarily includes: • Unrealized mark-to-market losses of $266 million and $92 million for the three months ended March 31, 2023 and 2022, respectively. • The elimination of intersegment RNF.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	3 Months Ended
	Mar. 31, 2023
Receivables [Abstract]
Purchases and Sales of Accounts Receivable	The following tables summarize the impact of the sale of certain receivables: As of March 31, 2023 As of December 31, 2022 Derecognized receivables transferred at fair value $ 1,474 $ 1,615 Cash proceeds received 1,100 1,100 DPP 374 515 Three Months Ended March 31, 2023 2022 Loss on sale of receivables (a) $ 20 $ 10 __________ (a) Reflected in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. This represents the amount by which the accounts receivable sold into the Facility are discounted, limited to credit losses. Three Months Ended March 31, 2023 2022 Proceeds from new transfers (a) $ 1,957 $ 1,654 Cash collections received on DPP 926 853 Cash collections reinvested in the Facility 2,883 2,507 __________ (a) Customer accounts receivable sold into the Facility were $2,750 million and $2,572 million for the three months ended March 31, 2023 and 2022, respectively. Three Months Ended March 31, 2023 2022 Total receivables sold $ 184 $ 69

Nuclear Decommissioning (Tables

Nuclear Decommissioning (Tables)	3 Months Ended
	Mar. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation	The following table provides a rollforward of the nuclear decommissioning AROs reflected in the Consolidated Balance Sheets from December 31, 2022 to March 31, 2023: Balance as of December 31, 2022 (a) $ 12,500 Accretion expense 139 Costs incurred related to decommissioning plants (8) Balance as of March 31, 2023 (a) $ 12,631 __________ (a) Includes $36 million and $40 million as the current portion of the ARO as of March 31, 2023 and December 31, 2022, respectively, which is included in Other current liabilities in the Consolidated Balance Sheets.
Related Party Transactions - Noncurrent Receivables from/Payables to affiliates	The following table presents our noncurrent payables to ComEd and PECO which are recorded as Payables related to Regulatory Agreement Units as of March 31, 2023 and December 31, 2022: March 31, 2023 December 31, 2022 ComEd $ 2,804 $ 2,660 PECO 265 237 Payables related to Regulatory Agreement Units $ 3,069 $ 2,897

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation	The effective income tax rate from continuing operations varies from the U.S. federal statutory rate principally due to the following: Three Months Ended March 31, 2023 (a) 2022 (a) U.S. federal statutory rate 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 3.3 55.2 Qualified NDT fund income and losses 33.7 (127.5) Amortization of investment tax credit, including deferred taxes on basis differences (0.7) (9.2) Production tax credits and other credits (0.8) (34.8) Noncontrolling interests — (1.0) Other (1.5) 9.4 Effective income tax rate (b) 55.0 % (86.9) % __________ (a) Positive percentages represent income tax expense. Negative percentages represent income tax benefit.

Retirement Benefits (Tables)

Retirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2023
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs	The following tables present the components of our net periodic benefit costs (credits), prior to capitalization and co-owner allocations, for the three months ended March 31, 2023 and 2022: Pension Benefits OPEB Total Pension Benefits and OPEB Three Months Ended March 31, Three Months Ended March 31, Three Months Ended March 31, 2023 2022 2023 2022 2023 2022 Components of net periodic benefit cost Service cost $ 22 $ 33 $ 4 $ 6 $ 26 $ 39 Non-service components of pension benefits & OPEB (credit) cost Interest cost 99 70 18 13 117 83 Expected return on assets (127) (137) (11) (14) (138) (151) Amortization of: Prior service cost (credit) — — (2) (2) (2) (2) Actuarial loss (gain) 12 38 (3) — 9 38 Non-service components of pension benefits & OPEB (credit) cost (16) (29) 2 (3) (14) (32) Net periodic benefit cost (a,b) $ 6 $ 4 $ 6 $ 3 $ 12 $ 7 __________ (a) The pension benefit and OPEB service costs reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2023 totaled $24 million. The pension benefit and OPEB non-service costs (credits) reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2023 totaled ($14) million. (b) The pension benefit and OPEB service costs reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2022 totaled $30 million. The pension benefit and OPEB non-service costs (credits) reflected in the Consolidated Statements of Operations and Comprehensive Income for the three months ended March 31, 2022 totaled ($25) million.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of the Derivative Fair Value	The following tables provide a summary of the derivative fair value balances recorded as of March 31, 2023 and December 31, 2022: March 31, 2023 Economic Proprietary Collateral (a)(b) Netting (a) Total Mark-to-market derivative assets (current assets) $ 10,189 $ 5 $ 362 $ (8,627) $ 1,929 Mark-to-market derivative assets (noncurrent assets) 4,236 — 153 (3,275) 1,114 Total mark-to-market derivative assets 14,425 5 515 (11,902) 3,043 Mark-to-market derivative liabilities (current liabilities) (10,641) (3) 443 8,628 (1,573) Mark-to-market derivative liabilities (noncurrent liabilities) (4,179) — 205 3,274 (700) Total mark-to-market derivative liabilities (14,820) (3) 648 11,902 (2,273) Total mark-to-market derivative net assets (liabilities) $ (395) $ 2 $ 1,163 $ — $ 770 December 31, 2022 Mark-to-market derivative assets (current assets) $ 15,296 $ 10 $ 161 $ (13,123) $ 2,344 Mark-to-market derivative assets (noncurrent assets) 5,100 — 217 (4,074) 1,243 Total mark-to-market derivative assets 20,396 10 378 (17,197) 3,587 Mark-to-market derivative liabilities (current liabilities) (15,049) (6) 374 13,123 (1,558) Mark-to-market derivative liabilities (noncurrent liabilities) (5,203) — 146 4,074 (983) Total mark-to-market derivative liabilities (20,252) (6) 520 17,197 (2,541) Total mark-to-market derivative net assets (liabilities) $ 144 $ 4 $ 898 $ — $ 1,046 _________ (a) We net all available amounts allowed in our Consolidated Balance Sheets in accordance with authoritative guidance for derivatives. These amounts include unrealized derivative transactions with the same counterparty under legally enforceable master netting agreements and cash collateral. In some cases we may have other offsetting exposures, subject to a master netting or similar agreement, such as trade receivables and payables, transactions that do not qualify as derivatives, letters of credit and other forms of non-cash collateral. These amounts are not material as of March 31, 2023 and December 31, 2022 and not reflected in the tables above. (b) Includes $295 million of variation margin posted and $836 million of variation margin held from the exchanges as of March 31, 2023 and December 31, 2022, respectively. The following table provides the mark-to-market derivative assets and liabilities as of March 31, 2023 and December 31, 2022: March 31, 2023 December 31, 2022 Economic Netting(a) Total Economic Netting(a) Total Mark-to-market derivative assets (current assets) $ 25 $ (2) $ 23 $ 29 $ (5) $ 24 Mark-to-market derivative assets (noncurrent assets) 11 — 11 18 — 18 Total mark-to-market derivative assets 36 (2) 34 47 (5) 42 Mark-to-market derivative liabilities (current liabilities) (2) 2 — (5) 5 — Mark-to-market derivative liabilities (noncurrent liabilities) — — — — — — Total mark-to-market derivative liabilities (2) 2 — (5) 5 — Total mark-to-market derivative net assets (liabilities) $ 34 $ — $ 34 $ 42 $ — $ 42 _________
Economic Hedges (Commodity Price Risk)	For the three months ended March 31, 2023 and 2022, we recognized the following net pre-tax commodity mark-to-market gains (losses) which are also located in the Net fair value changes related to derivatives line in the Consolidated Statements of Cash Flows. Three Months Ended March 31, 2023 2022 Income Statement Location Gains (Losses) Operating revenues $ 930 $ (919) Purchased power and fuel (1,193) 826 Total $ (263) $ (93)
Disclosure of Credit Derivatives	The following tables provide information on the credit exposure for all derivative instruments, NPNS and payables and receivables, net of collateral and instruments that are subject to master netting agreements, as of March 31, 2023. The tables further delineate that exposure by credit rating of the counterparties and provide guidance on the concentration of credit risk to individual counterparties. The amounts in the tables below exclude credit risk exposure from individual retail counterparties, nuclear fuel procurement contracts, and exposure through RTOs, ISOs, NYMEX, ICE, NASDAQ, NGX, and Nodal commodity exchanges. Rating as of March 31, 2023 Total Credit Collateral (a) Net Number of Net Exposure of Investment grade $ 950 $ 63 $ 887 — $ — Non-investment grade 8 — 8 — — No external ratings Internally rated — investment grade 179 — 179 — — Internally rated — non-investment grade 325 30 295 — — Total $ 1,462 $ 93 $ 1,369 — $ — Net Credit Exposure by Type of Counterparty As of March 31, 2023 Investor-owned utilities, marketers, power producers $ 1,074 Energy cooperatives and municipalities 174 Financial Institutions 27 Other 94 Total $ 1,369 __________ (a) As of March 31, 2023, credit collateral held from counterparties where we had credit exposure included $41 million of cash and $52 million of letters of credit. The credit collateral does not include non-liquid collateral.
Fair Value of Derivatives with Credit- Risk Related Contingent Features	The aggregate fair value of all derivative instruments with credit-risk-related contingent features in a liability position that are not fully collateralized (excluding transactions on the exchanges that are fully collateralized) is detailed in the table below: Credit-Risk-Related Contingent Features March 31, 2023 December 31, 2022 Gross fair value of derivative contracts containing this feature (a) $ (2,683) $ (4,736) Offsetting fair value of in-the-money contracts under master netting arrangements (b) 987 2,048 Net fair value of derivative contracts containing this feature (c) $ (1,696) $ (2,688) __________ (a) Amount represents the gross fair value of out-of-the-money derivative contracts containing credit-risk-related contingent features ignoring the effects of master netting agreements. (b) Amount represents the offsetting fair value of in-the-money derivative contracts under legally enforceable master netting agreements with the same counterparty, which reduces the amount of any liability for which we could potentially be required to post collateral. (c) Amount represents the net fair value of out-of-the-money derivative contracts containing credit-risk-related contingent features after considering the mitigating effects of offsetting positions under master netting arrangements and reflects the actual net liability upon which any potential contingent collateral obligations would be based.
Cash Collateral and Letters of Credit on Derivative Contracts	As of March 31, 2023 and December 31, 2022, we posted or held the following amounts of cash collateral and letters of credit on derivative contracts with external counterparties, after giving consideration to offsetting derivative and non-derivative positions under master netting agreements. March 31, 2023 December 31, 2022 Cash collateral posted (a) $ 1,898 $ 1,636 Letters of credit posted (a) 672 947 Cash collateral held (a) 755 765 Letters of credit held (a) 71 115 Additional collateral required in the event of a credit downgrade below investment grade (at BB+/Ba1)(b)(c) 2,405 3,337 __________ (a) The cash collateral and letters of credit amounts are inclusive of NPNS contracts. (b) Certain of our contracts contain provisions that allow a counterparty to request additional collateral when there has been a subjective determination that our credit quality has deteriorated, generally termed “adequate assurance.” Due to the subjective nature of these provisions, we estimate the amount of collateral that we may ultimately be required to post in relation to the maximum exposure with the counterparty.

Debt and Credit Agreements (Tab

Debt and Credit Agreements (Tables)	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Schedule of Short-term Debt	The following table reflects our commercial paper program supported by the revolving credit agreements as of March 31, 2023 and December 31, 2022: Outstanding Commercial Weighted Average Interest Rate on March 31, 2023 December 31, 2022 March 31, 2023 December 31, 2022 $ 205 $ 959 5.09 % 4.90 %
Schedule of Line of Credit Facilities	As of March 31, 2023, we had the following aggregate bank commitments, credit facility borrowings and available capacity under our respective credit facilities: Available Capacity as of March 31, 2023 Facility Type Aggregate Bank Facility Draws Outstanding Actual To Support Syndicated Revolver $ 3,500 $ — $ 196 $ 3,304 $ 3,099 Bilaterals (a) 1,310 — 785 525 — Liquidity Facility 971 — 576 295 (b) — Project Finance 131 — 108 23 — Total $ 5,912 $ — $ 1,665 $ 4,147 $ 3,099 __________ (a) On January 20, 2023, a bilateral credit agreement initiated on August 24, 2022 decreased from $100 million to $10 million. On March 29, 2023, we initiated a new bilateral credit agreement for $100 million, with a maturity date of March 29, 2025. On January 31, 2023, a bilateral credit agreement initiated on May 15, 2020 increased from $200 million to $250 million, and on March 31, 2023 this agreement increased to $300 million. On April 4, 2023, a bilateral credit agreement initiated on January 5, 2016 was extended for three years to April 3, 2026. (b) The maximum amount of the bank commitment is not to exceed $971 million. The aggregate available capacity of the facility is subject to market fluctuations based on the value of U.S. Treasury Securities which determines the amount of collateral held in the trust. We may post additional collateral to borrow up to the maximum bank commitment. As of March 31, 2023, without posting additional collateral, the actual availability of facility, prior to outstanding letters of credit was $871 million.
Schedule of Long-term Debt Instruments	During the three months ended March 31, 2023, the following long-term debt was issued: Type Interest Rate Maturity Amount Use of Proceeds 2028 Senior Notes 5.60 % March 1, 2028 $ 750 To fund general corporate purposes, including repayment of short-term borrowings 2033 Senior Notes 5.80 % March 1, 2033 600 To fund general corporate purposes, including repayment of short-term borrowings Energy Efficiency Project Financing (a) 2.20% - 4.96% May 31, 2023 - May 1, 2024 3 Funding to install energy conservation measures __________ (a) For Energy Efficiency Project Financing, the maturity dates represent the expected date of project completion, upon which the respective customer assumes the outstanding debt. During the three months ended March 31, 2023, the following long-term debt was redeemed: Type Interest Rate Maturity Amount Continental Wind Nonrecourse Debt 6.00% February 28, 2033 $ 15 West Medway II Nonrecourse Debt 1 month LIBOR + 2.875% March 31, 2026 7 Antelope Valley DOE Nonrecourse Debt 2.29% - 3.56% January 5, 2037 6 RPG Nonrecourse Debt 4.11% March 31, 2035 2

Fair Value of Financial Asset_2

Fair Value of Financial Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value of Financial Liabilities Recorded at Amortized Cost	The following table presents the carrying amounts and fair values of the short-term liabilities, long-term debt, and the SNF obligation as of March 31, 2023 and December 31, 2022. We have no financial liabilities classified as Level 1. The carrying amounts of the short-term liabilities as presented in the Consolidated Balance Sheets are representative of their fair value (Level 2) because of the short-term nature of these instruments. March 31, 2023 December 31, 2022 Carrying Amount Fair Value Carrying Amount Fair Value Level 2 Level 3 Total Level 2 Level 3 Total Long-term debt, including amounts due within one year $ 5,924 $ 5,123 $ 861 $ 5,984 $ 4,609 $ 3,688 $ 859 $ 4,547 SNF Obligation 1,244 1,082 — 1,082 1,230 1,021 — 1,021
Assets and Liabilities Measured and Recorded at Fair Value on Recurring Basis	The following tables present assets and liabilities measured and recorded at fair value in the Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy as of March 31, 2023 and December 31, 2022: As of March 31, 2023 As of December 31, 2022 Level 1 Level 2 Level 3 Not subject to leveling Total Level 1 Level 2 Level 3 Not subject to leveling Total Assets Cash equivalents (a) $ 30 $ — $ — $ — $ 30 $ 41 $ — $ — $ — $ 41 NDT fund investments Cash equivalents (b) 530 85 — — 615 349 88 — — 437 Equities 3,971 1,592 — 1,144 6,707 3,462 1,498 — 1,421 6,381 Fixed income Corporate debt (c) — 860 266 — 1,126 — 885 264 — 1,149 U.S. Treasury and agencies 1,883 57 — — 1,940 1,996 46 — — 2,042 Foreign governments — 46 — — 46 — 39 — — 39 State and municipal debt — 52 — — 52 — 53 — — 53 Other 22 19 — 1,820 1,861 21 21 — 1,649 1,691 Fixed income subtotal 1,905 1,034 266 1,820 5,025 2,017 1,044 264 1,649 4,974 Private credit — — 155 626 781 — — 159 643 802 Private equity — — — 681 681 — — — 687 687 Real estate — — — 977 977 — — — 1014 1,014 NDT fund investments subtotal (d)(e) 6,406 2,711 421 5,248 14,786 5,828 2,630 423 5,414 14,295 Rabbi trust investments Cash equivalents 1 — — — 1 1 — — — 1 Mutual funds 41 — — — 41 39 — — — 39 Life insurance contracts — 29 1 — 30 — 27 1 — 28 Rabbi trust investments subtotal 42 29 1 — 72 40 27 1 — 68 Investments in equities 5 — — — 5 6 — — — 6 Commodity derivative assets Economic hedges 2,729 7,322 4,410 — 14,461 3,505 11,353 5,585 — 20,443 Proprietary trading — 2 3 — 5 — 4 6 — 10 Effect of netting and allocation of (f)(g) (2,334) (6,397) (2,658) — (11,389) (2,951) (10,348) (3,525) — (16,824) Commodity derivative assets subtotal 395 927 1,755 — 3,077 554 1,009 2,066 — 3,629 DPP consideration — 374 — — 374 — 515 — — 515 Total assets 6,878 4,041 2,177 5,248 18,344 6,469 4,181 2,490 5,414 18,554 Liabilities Commodity derivative liabilities Economic hedges (2,804) (8,099) (3,919) — (14,822) (3,171) (11,498) (5,588) — (20,257) Proprietary trading — (2) (1) — (3) — (4) (2) — (6) Effect of netting and allocation of collateral (f)(g) 2,771 6,869 2,912 — 12,552 3,279 10,700 3,743 — 17,722 Commodity derivative liabilities subtotal (33) (1,232) (1,008) — (2,273) 108 (802) (1,847) — (2,541) Deferred compensation obligation — (57) — — (57) — (57) — — (57) Total liabilities (33) (1,289) (1,008) — (2,330) 108 (859) (1,847) — (2,598) Total net assets (liabilities) $ 6,845 $ 2,752 $ 1,169 $ 5,248 $ 16,014 $ 6,577 $ 3,322 $ 643 $ 5,414 $ 15,956 __________ (a) CEG Parent has $38 million and $49 million of Level 1 cash equivalents as of March 31, 2023 and December 31, 2022, respectively. We exclude cash of $222 million and $390 million as of March 31, 2023 and December 31, 2022, respectively, and restricted cash of $75 million and $70 million as of March 31, 2023 and December 31, 2022, respectively. CEG Parent excludes an additional $1 million and $19 million of cash as of March 31, 2023 and December 31, 2022, respectively. (b) Includes $106 million and $99 million of cash received from outstanding repurchase agreements as of March 31, 2023 and December 31, 2022, respectively, and is offset by an obligation to repay upon settlement of the agreement as discussed in (e) below. (c) Includes investments in equities sold short of ($46) million and ($45) million as of March 31, 2023 and December 31, 2022, respectively, held in an investment vehicle primarily to hedge the equity option component of convertible debt. (d) Includes net derivative assets of less than $1 million and $1 million, which have total notional amounts of $530 million and $494 million as of March 31, 2023 and December 31, 2022, respectively. The notional principal amounts for these instruments provide one measure of the transaction volume outstanding as of the periods ended and do not represent the amount of our exposure to credit or market loss. (e) Excludes net liabilities of $110 million and $168 million as of March 31, 2023 and December 31, 2022, respectively, which include certain derivative assets that have notional amounts of $163 million and $59 million as of March 31, 2023 and December 31, 2022, respectively. These items consist of receivables related to pending securities sales, interest and dividend receivables, repurchase agreement obligations, and payables related to pending securities purchases. The repurchase agreements are generally short-term in nature with durations generally of 30 days or less. (f) Net collateral posted to counterparties totaled $437 million, $472 million, and $254 million allocated to Level 1, Level 2, and Level 3 mark-to-market derivatives, respectively, as of March 31, 2023. Net collateral posted to counterparties totaled $328 million, $352 million, and $218 million allocated to Level 1, Level 2, and Level 3 mark-to-market derivatives, respectively, as of December 31, 2022. (g) Includes $295 million of variation margin posted and $836 million of variation margin held from the exchanges as of March 31, 2023 and December 31, 2022, respectively.
Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis during the three months ended March 31, 2023 and 2022: For the Three Months Ended March 31, 2023 NDT Fund Investments Mark-to-Market Life Insurance Contracts Total Balance as of January 1, 2023 $ 423 $ 219 $ 1 $ 643 Total realized / unrealized gains Included in net income — 506 (a) — 506 Change in collateral — 35 — 35 Purchases, sales, issuances and settlements Purchases — 66 — 66 Sales — (4) — (4) Settlements (2) — — (2) Transfers into Level 3 — (8) (b) — (8) Transfers out of Level 3 — (67) (b) — (67) Balance as of March 31, 2023 $ 421 $ 747 $ 1 $ 1,169 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities as of March 31, 2023 $ — $ 712 $ — $ 712 For the Three Months Ended March 31, 2022 NDT Fund Investments Mark-to-Market Life Insurance Contracts Total Balance as of January 1, 2022 $ 464 $ (94) $ — $ 370 Total realized / unrealized losses Included in net income — (1,011) (a) — (1,011) Included in noncurrent payables to affiliates (2) — — (2) Change in collateral — (262) (262) Impacts of separation — — 3 3 Purchases, sales, issuances and settlements Purchases — 49 — 49 Sales — (26) — (26) Settlements — — — — Transfers into Level 3 — 101 (b) — 101 Transfers out of Level 3 — (35) (b) — (35) Balance as of March 31, 2022 $ 462 $ (1,278) $ 3 $ (813) The amount of total losses included in income attributed to the change in unrealized losses related to assets and liabilities as of March 31, 2022 $ — $ (1,019) $ — $ (1,019) __________ (a) Includes a reduction of $206 million for realized gains and an addition of $8 million for realized losses due to the settlement of derivative contracts for the three months ended March 31, 2023, and 2022 respectively. (b) Transfers into and out of Level 3 generally occur when the contract tenor becomes less or more observable, respectively, primarily due to changes in market liquidity or assumptions for certain commodity contracts.
Total Realized and Unrealized Gains (Losses) Included in Income for Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the income statement classification of the total realized and unrealized gains (losses) included in income for Level 3 assets and liabilities measured at fair value on a recurring basis during the three months ended March 31, 2023 and 2022: For the Three Months Ended March 31, Operating Purchased Other, net 2023 2022 2023 2022 2023 2022 Total gains (losses) included in net income $ 547 $ (1,021) $ (41) $ 10 $ — $ — Total unrealized gains (losses) 839 (1,221) (127) 202 — —
Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis, Valuation Technique	The following table presents the significant inputs to the forward curve used to value level 3 mark-to-market derivative positions: Type of trade Fair Value as of March 31, 2023 Fair Value as of December 31, 2022 Valuation Unobservable 2023 Range & Arithmetic Average 2022 Range & Arithmetic Average Mark-to-market derivatives—Economic hedges (a)(b) $ 491 $ (3) Discounted Cash Flow Forward power $(0.75) - $196 $55 $0.63 - $283 $72 Forward gas $1.75 - $17 $4.01 $1.67 - $26 $4.57 Option Volatility 114% - 119% 116% 97% - 119% 111% __________ (a) The valuation techniques, unobservable inputs, ranges, and arithmetic averages are the same for the asset and liability positions. (b) The fair values do not include cash collateral posted on level 3 positions of $254 million and $218 million as of March 31, 2023 and December 31, 2022, respectively.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Other Commitments	Commercial commitments as of March 31, 2023, representing commitments potentially triggered by future events, were as follows: Expiration within Total 2023 2024 2025 2026 2027 2028 and beyond Letters of credit $ 1,665 $ 1,382 $ 245 $ — $ — $ 38 $ — Surety bonds (a) 986 842 144 — — — — Total commercial commitments $ 2,651 $ 2,224 $ 389 $ — $ — $ 38 $ — __________

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2023
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Income (Loss)	The following tables present changes in AOCI, net of tax, by component: Three Months Ended March 31, 2023 Losses on Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items(a) Foreign Currency Items Total Beginning balance $ (9) $ (1,725) $ (26) $ (1,760) OCI before reclassifications — (53) — (53) Amounts reclassified from AOCI — 5 — 5 Net current-period OCI — (48) — (48) Ending balance $ (9) $ (1,773) $ (26) $ (1,808) Three Months Ended March 31, 2022 Losses on Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items(a) Foreign Currency Items Total Beginning balance $ (8) $ — $ (23) $ (31) Separation-related adjustments — (2,006) — (2,006) OCI before reclassifications — — 4 4 Amounts reclassified from AOCI — 17 — 17 Net current-period OCI — (1,989) 4 (1,985) Ending balance $ (8) $ (1,989) $ (19) $ (2,016) __________ (a) AOCI amounts are included in the computation of net periodic pension and OPEB cost. See Note 8 — Retirement Benefits for additional information. See our Statements of Operations and Comprehensive Income for individual components of AOCI. The following table presents income tax (expense) benefit allocated to each component of our other comprehensive loss: Three Months Ended March 31, 2023 2022 Pension and non-pension postretirement benefit plans: Actuarial loss reclassified to periodic benefit cost $ (2) $ (6) Pension and non-pension postretirement benefit plans valuation adjustment 18 680

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2023
Variable Interest Entity [Abstract]
Consolidated VIEs- Assets and Liabilities	The table below shows the carrying amounts and classification of the consolidated VIEs’ assets and liabilities included in the consolidated financial statements as of March 31, 2023 and December 31, 2022. The assets, except as noted in the footnotes to the table below, can only be used to settle obligations of the VIEs. The liabilities, except as noted in the footnotes to the table below, are such that creditors, or beneficiaries, do not have recourse to our general credit. March 31, 2023 December 31, 2022 Cash and cash equivalents $ 55 $ 51 Restricted cash and cash equivalents 32 46 Accounts receivable Customer 27 20 Other 7 9 Inventories, net Materials and supplies 13 12 Other current assets 406 549 Total current assets 540 687 Property, plant and equipment, net 1,977 1,965 Other noncurrent assets 184 190 Total noncurrent assets 2,161 2,155 Total assets (a) $ 2,701 $ 2,842 Long-term debt due within one year $ 61 $ 60 Accounts payable 42 17 Accrued expenses 11 23 Other current liabilities 1 2 Total current liabilities 115 102 Long-term debt 741 764 Asset retirement obligations 175 173 Other noncurrent liabilities 3 3 Total noncurrent liabilities 919 940 Total liabilities (b) $ 1,034 $ 1,042 __________ (a) Our balances include unrestricted assets f or current unamortized energy contract assets of $23 million and $23 million, disclosed within other current assets in the table above, noncurrent unamortized energy contract assets of $172 million and $178 million, disclosed within other noncurrent assets in the table above as of March 31, 2023 and December 31, 2022, respectively. (b) Our balances include liabilities with recourse of $1 million as of March 31, 2023 and December 31, 2022.
Schedule of Variable Interest Entities	As of March 31, 2023 and December 31, 2022, our consolidated VIEs included the following: Consolidated VIE or VIE groups: Reason entity is a VIE: Reason we are the primary beneficiary: CRP - A collection of wind and solar project entities. We have a 51% equity ownership in CRP. See additional discussion below. Similar structure to a limited partnership and the limited partners do not have kick out rights with respect to the general partner. We conduct the operational activities. Bluestem Wind Energy Holdings, LLC - A Tax Equity structure which is consolidated by CRP. Similar structure to a limited partnership and the limited partners do not have kick out rights with respect to the general partner. We conduct the operational activities. Antelope Valley - A solar generating facility, which is 100% owned by us. Antelope Valley sells all of its output to PG&E through a PPA. The PPA contract absorbs variability through a performance guarantee. We conduct all activities. NER - A bankruptcy remote, special purpose entity which is 100% owned by us, which purchases certain of our customer accounts receivable arising from the sale of retail electricity. NER’s assets will be available first and foremost to satisfy the claims of the creditors of NER. Refer to Note 5 —Accounts Receivable for additional information on the sale of receivables. Equity capitalization is insufficient to support its operations. We conduct all activities. The following table presents summary information about our significant unconsolidated VIE entities: March 31, 2023 December 31, 2022 Commercial Equity Total Commercial Equity Total Total assets (a) $ 713 $ — $ 713 $ 715 $ — $ 715 Total liabilities (a) 63 — 63 54 — 54 Our ownership interest in VIE (a) — — — — — — Other ownership interests in VIE (a) 650 — 650 661 — 661 __________ (a) These items represent amounts on the unconsolidated VIE balance sheets, not in the Consolidated Balance Sheets. These items are included to provide information regarding the relative size of the unconsolidated VIEs. We do not have any exposure to loss as we do not have a carrying amount in the equity investment VIEs as o f March 31, 2023 and December 31, 2022. As of March 31, 2023 and December 31, 2022 the unconsolidated VIEs consist of: Unconsolidated VIE groups: Reason entity is a VIE: Reason we are not the primary beneficiary: Equity investments in distributed energy companies. We sold this investment in the fourth quarter of 2022 resulting in it no longer being classified as an unconsolidated VIE. Similar structures to a limited partnership and the limited partners do not have kick-out rights with respect to the general partner. We do not conduct the operational activities. Energy Purchase and Sale agreements - We have several energy purchase and sale agreements with generating facilities. PPA contracts that absorb variability through fixed pricing. We do not conduct the operational activities.

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	3 Months Ended
	Mar. 31, 2023
Supplemental Financial Information [Abstract]
Supplemental Statement of Operations Information	The following tables provide additional information about material items recorded in the Consolidated Statements of Operations and Comprehensive Income. Operating revenues Three Months Ended March 31, 2023 2022 Operating lease income $ 4 $ 4 Variable lease income 58 56 Taxes other than income taxes Three Months Ended March 31, 2023 2022 Gross receipts (a) $ 33 $ 30 Property 56 70 Payroll 34 33 __________ (a) Represent gross receipts taxes related to our retail operations. The offsetting collection of gross receipts taxes from customers is recorded in Operating revenues in the Consolidated Statements of Operations and Comprehensive Income.
Schedule of Other Nonoperating Income, by Component	Other, net Three Months Ended March 31, 2023 2022 Decommissioning-related activities: Net realized income on NDT funds (a) Regulatory Agreement Units $ 314 $ 174 Non-Regulatory Agreement Units 194 85 Net unrealized (losses) gains on NDT funds Regulatory Agreement Units 29 (537) Non-Regulatory Agreement Units 18 (337) Regulatory offset to NDT fund-related activities (b) (275) 291 Decommissioning-related activities 280 (324) Investment Income 16 3 Non-service net periodic benefit credit (c) 14 18 Net realized and unrealized losses from equity investments (5) (20) __________ (a) Realized income includes interest, dividends and realized gains and losses on sales of NDT fund investments. (b) Includes the elimination of decommissioning-related activities and the elimination of income taxes related to all NDT fund activity for the Regulatory Agreement Units. (c) Prior to separation, we were allocated our portion of pension and OPEB non-service credits (costs) from Exelon, which was included in Operating and maintenance expense. Effective February 1, 2022, the non-service credit (cost) components are included in Other, net, in accordance with single employer plan accounting. See Note 8 — Retirement Benefits for additional information.
Cash Flow Supplemental Disclosures	The following tables provide additional information about material items recorded within our Consolidated Statements of Cash Flows. Depreciation, amortization and accretion Three Months Ended March 31, 2023 2022 Property, plant, and equipment (a) $ 262 $ 270 Amortization of intangible assets, net (a) 5 10 Amortization of energy contract assets and liabilities (b) 9 9 Nuclear fuel (c) 186 181 ARO accretion (d) 143 132 Total depreciation, amortization, and accretion $ 605 $ 602 __________ (a) Included in Depreciation and amortization expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Included in Operating revenues or Purchased power and fuel expense in the Consolidated Statements of Operations and Comprehensive Income. (c) Included in Purchased power and fuel expense in the Consolidated Statements of Operations and Comprehensive Income. (d) Included in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. Other non-cash operating activities CEG Parent Constellation Three Months Ended March 31, Three Months Ended March 31, 2023 2022 2023 2022 Pension and non-pension postretirement benefit costs $ 12 $ 7 $ 12 $ 7 Other decommissioning-related activity (a) (136) 6 (136) 6 Energy-related options (b) 93 188 93 188 Long-term incentive plan 12 9 — — Amortization of operating ROU asset 8 17 8 17 Loss on sale of receivables 20 10 20 10 Fair value adjustments related to gas imbalances 31 26 31 26 __________ (a) Includes the elimination of decommissioning-related activities for the Regulatory Agreement Units, including the elimination of operating revenues, ARO accretion, ARC amortization, investment income, and income taxes related to all NDT fund activity for these units. (b) Includes option premiums reclassified to realized at the settlement of the underlying contracts and recorded to results of operations. The following table provides a reconciliation of cash, restricted cash, and cash equivalents reported within our Consolidated Balance Sheets that sum to the total of the same amounts in the Consolidated Statements of Cash Flows. CEG Parent Constellation March 31, 2023 Cash and cash equivalents $ 237 $ 236 Restricted cash and cash equivalents 99 91 Total cash, restricted cash, and cash equivalents $ 336 $ 327 December 31, 2022 Cash and cash equivalents $ 422 $ 403 Restricted cash and cash equivalents 106 98 Total cash, restricted cash, and cash equivalents $ 528 $ 501 March 31, 2022 Cash and cash equivalents $ 1,605 $ 1,605 Restricted cash and cash equivalents 91 79 Total cash, restricted cash, and cash equivalents $ 1,696 $ 1,684 December 31, 2021 Cash and cash equivalents $ 504 $ 504 Restricted cash and cash equivalents 72 72 Total cash, restricted cash, and cash equivalents $ 576 $ 576
Supplemental Balance Sheet Information	The following table provides additional information about material items recorded within our Consolidated Balance Sheets. Accrued expenses March 31, 2023 CEG Parent Constellation Compensation-related accruals (a) $ 274 $ 220 Taxes accrued 327 325 December 31, 2022 Compensation-related accruals (a) $ 540 $ 502 Taxes accrued 257 257 __________ (a) Primarily includes accrued payroll, bonuses and other incentives, vacation, and benefits.

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2023
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	The following table presents our Operating revenues from affiliates: Three Months Ended March 31, 2022 (a) ComEd (b) $ 58 PECO (b) 33 BGE (b) 18 PHI 51 Pepco (b) 39 DPL (b) 10 ACE (b) 2 Total operating revenues from affiliates $ 160 __________ (a) Represents only January 2022 activity prior to separation on February 1, 2022. (b) See Note 24 - Related Party Transactions of our 2022 Form 10-K for additional information on the Exelon utility subsidiaries.

Basis of Presentation (Details)

Basis of Presentation (Details) $ in Millions		3 Months Ended
	Jan. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 USD ($) segment	Mar. 31, 2023 USD ($) Reportable_segment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jan. 20, 2022
Significant Accounting Policies Additional Narrative Information [Line Items]
Number of reportable segments			5	5
Conversion ratio							0.3333
Contributions from Exelon	$ 1,750	$ 0			$ 1,750
Intercompany loan		3,069	$ 3,069	$ 3,069		$ 2,897
Short-term borrowings	$ 200	705	705	705		$ 1,159
Credit facility term	5 years
Credit facility	$ 4,500	5,912	$ 5,912	$ 5,912
Billings from related party		50			56
Billings to related party		$ 6			$ 9
Pension Benefits
Significant Accounting Policies Additional Narrative Information [Line Items]
Contributions from Exelon	192
Exelon Consolidation
Significant Accounting Policies Additional Narrative Information [Line Items]
Intercompany loan	$ 258

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($)			3 Months Ended
	Mar. 28, 2023	Feb. 15, 2021	Mar. 31, 2023	Mar. 31, 2022
Regulatory Matters Additional Narrative Information [Line Items]
Increase in revenue			$ 7,565,000,000	$ 5,431,000,000
Winter Storm Elliott
Regulatory Matters Additional Narrative Information [Line Items]
Increase in revenue			38,000,000
Receivable for performance bonuses, net			$ 148,000,000
FERC
Regulatory Matters Additional Narrative Information [Line Items]
Percentage of fixed costs recoverable	91%
ERCOT | Extreme Cold Weather Conditions
Regulatory Matters Additional Narrative Information [Line Items]
Administrative price cap		$ 9,000

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Contract Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Change in Contract with Customer [Roll Forward]
Beginning Balance - Contract Assets	$ 130	$ 149
Amounts reclassified to receivables	(11)	(16)
Revenues recognized	31	9
Ending Balance - Contract Assets	$ 150	$ 142

Revenue from Contracts with C_4

Revenue from Contracts with Customer - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Contract with Customer, Liability [Roll Forward]
Beginning Balance - Contract Liabilities	$ 47	$ 75
Consideration received or due	131	50
Revenues recognized	(115)	(63)
Ending Balance - Contract Liabilities	$ 63	$ 62

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Performance Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues recognized	$ 7,565	$ 5,591
Remaining performance obligations	460
Contract Liability
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues recognized	10	$ 28
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 195
Remaining performance obligations, timing	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 82
Remaining performance obligations, timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 32
Remaining performance obligations, timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 15
Remaining performance obligations, timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 136
Remaining performance obligations, timing	1 year

Segment Information - Narrative

Segment Information - Narrative (Details) - 3 months ended Mar. 31, 2023	segment	Reportable_segment
Segment Reporting [Abstract]
Number of reportable segments	5	5

Segment Information - Generatio

Segment Information - Generation Total Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total operating revenues	$ 7,565	$ 5,591
Mid-Atlantic
Segment Reporting Information [Line Items]
Total operating revenues	1,245	1,104
Midwest
Segment Reporting Information [Line Items]
Total operating revenues	1,032	1,197
New York
Segment Reporting Information [Line Items]
Total operating revenues	535	365
ERCOT
Segment Reporting Information [Line Items]
Total operating revenues	169	235
Other Power Regions
Segment Reporting Information [Line Items]
Total operating revenues	1,791	1,927
Total Competitive Businesses Electric Revenues
Segment Reporting Information [Line Items]
Total operating revenues	4,772	4,828
Competitive Businesses Natural Gas Revenues
Segment Reporting Information [Line Items]
Total operating revenues	1,485	1,445
Competitive Businesses Other Revenues
Segment Reporting Information [Line Items]
Total operating revenues	1,308	(682)
Unrealized mark-to-market gains (losses)	929	(921)
Total Consolidated Operating Revenues
Segment Reporting Information [Line Items]
Total operating revenues	7,565	5,591
Operating Segments | Mid-Atlantic
Segment Reporting Information [Line Items]
Total operating revenues	1,276	1,104
Operating Segments | Midwest
Segment Reporting Information [Line Items]
Total operating revenues	1,030	1,197
Operating Segments | New York
Segment Reporting Information [Line Items]
Total operating revenues	501	359
Operating Segments | ERCOT
Segment Reporting Information [Line Items]
Total operating revenues	168	235
Operating Segments | Other Power Regions
Segment Reporting Information [Line Items]
Total operating revenues	1,797	1,933
Operating Segments | Total Competitive Businesses Electric Revenues
Segment Reporting Information [Line Items]
Total operating revenues	4,772	4,828
Operating Segments | Competitive Businesses Natural Gas Revenues
Segment Reporting Information [Line Items]
Total operating revenues	1,485	1,445
Operating Segments | Competitive Businesses Other Revenues
Segment Reporting Information [Line Items]
Unrealized mark-to-market gains (losses)	(266)	(92)
Operating Segments | Total Consolidated Operating Revenues
Segment Reporting Information [Line Items]
Total operating revenues	7,565	5,591
Intersegment Revenues | Mid-Atlantic
Segment Reporting Information [Line Items]
Total operating revenues	(31)	0
Intersegment Revenues | Midwest
Segment Reporting Information [Line Items]
Total operating revenues	2	0
Intersegment Revenues | New York
Segment Reporting Information [Line Items]
Total operating revenues	34	6
Intersegment Revenues | ERCOT
Segment Reporting Information [Line Items]
Total operating revenues	1	0
Intersegment Revenues | Other Power Regions
Segment Reporting Information [Line Items]
Total operating revenues	(6)	(6)
Intersegment Revenues | Total Competitive Businesses Electric Revenues
Segment Reporting Information [Line Items]
Total operating revenues	0	0
Intersegment Revenues | Competitive Businesses Natural Gas Revenues
Segment Reporting Information [Line Items]
Total operating revenues	0	0
Intersegment Revenues | Competitive Businesses Other Revenues
Segment Reporting Information [Line Items]
Total operating revenues	0	0
Intersegment Revenues | Total Consolidated Operating Revenues
Segment Reporting Information [Line Items]
Total operating revenues	0	0
Corporate, Non-Segment | Competitive Businesses Other Revenues
Segment Reporting Information [Line Items]
Total operating revenues	1,308	(682)
Contracts with customers | Operating Segments | Mid-Atlantic
Segment Reporting Information [Line Items]
Total operating revenues	1,413	1,154
Contracts with customers | Operating Segments | Midwest
Segment Reporting Information [Line Items]
Total operating revenues	1,195	1,248
Contracts with customers | Operating Segments | New York
Segment Reporting Information [Line Items]
Total operating revenues	464	494
Contracts with customers | Operating Segments | ERCOT
Segment Reporting Information [Line Items]
Total operating revenues	200	163
Contracts with customers | Operating Segments | Other Power Regions
Segment Reporting Information [Line Items]
Total operating revenues	1,518	1,421
Contracts with customers | Operating Segments | Total Competitive Businesses Electric Revenues
Segment Reporting Information [Line Items]
Total operating revenues	4,790	4,480
Contracts with customers | Operating Segments | Competitive Businesses Natural Gas Revenues
Segment Reporting Information [Line Items]
Total operating revenues	895	811
Contracts with customers | Operating Segments | Total Consolidated Operating Revenues
Segment Reporting Information [Line Items]
Total operating revenues	5,833	5,377
Contracts with customers | Corporate, Non-Segment | Competitive Businesses Other Revenues
Segment Reporting Information [Line Items]
Total operating revenues	148	86
Other | Operating Segments | Mid-Atlantic
Segment Reporting Information [Line Items]
Total operating revenues	(137)	(50)
Other | Operating Segments | Midwest
Segment Reporting Information [Line Items]
Total operating revenues	(165)	(51)
Other | Operating Segments | New York
Segment Reporting Information [Line Items]
Total operating revenues	37	(135)
Other | Operating Segments | ERCOT
Segment Reporting Information [Line Items]
Total operating revenues	(32)	72
Other | Operating Segments | Other Power Regions
Segment Reporting Information [Line Items]
Total operating revenues	279	512
Other | Operating Segments | Total Competitive Businesses Electric Revenues
Segment Reporting Information [Line Items]
Total operating revenues	(18)	348
Other | Operating Segments | Competitive Businesses Natural Gas Revenues
Segment Reporting Information [Line Items]
Total operating revenues	590	634
Other | Operating Segments | Total Consolidated Operating Revenues
Segment Reporting Information [Line Items]
Total operating revenues	1,732	214
Other | Corporate, Non-Segment | Competitive Businesses Other Revenues
Segment Reporting Information [Line Items]
Total operating revenues	$ 1,160	$ (768)

Segment Information - Generat_2

Segment Information - Generation Total Revenues Net of Purchased Power and Fuel Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Mid-Atlantic
Segment Reporting Information [Line Items]
Revenue Net of Purchase Power And Fuel	$ 691	$ 508
Midwest
Segment Reporting Information [Line Items]
Revenue Net of Purchase Power And Fuel	689	785
New York
Segment Reporting Information [Line Items]
Revenue Net of Purchase Power And Fuel	261	268
ERCOT
Segment Reporting Information [Line Items]
Revenue Net of Purchase Power And Fuel	52	79
Other Power Regions
Segment Reporting Information [Line Items]
Revenue Net of Purchase Power And Fuel	248	287
Total Competitive Businesses Electric Revenues
Segment Reporting Information [Line Items]
Revenue Net of Purchase Power And Fuel	1,941	1,927
Other
Segment Reporting Information [Line Items]
Revenue Net of Purchase Power And Fuel	(105)	114
Unrealized mark-to-market gains (losses)	929	(921)
Total Consolidated Operating Revenues
Segment Reporting Information [Line Items]
Revenue Net of Purchase Power And Fuel	1,836	2,041
Operating Segments | Mid-Atlantic
Segment Reporting Information [Line Items]
RNF from external customers	722	509
Operating Segments | Midwest
Segment Reporting Information [Line Items]
RNF from external customers	690	785
Operating Segments | New York
Segment Reporting Information [Line Items]
RNF from external customers	225	260
Operating Segments | ERCOT
Segment Reporting Information [Line Items]
RNF from external customers	53	106
Operating Segments | Other Power Regions
Segment Reporting Information [Line Items]
RNF from external customers	256	297
Operating Segments | Total Competitive Businesses Electric Revenues
Segment Reporting Information [Line Items]
RNF from external customers	1,946	1,957
Operating Segments | Other
Segment Reporting Information [Line Items]
RNF from external customers	(110)	84
Unrealized mark-to-market gains (losses)	(266)	(92)
Operating Segments | Total Consolidated Operating Revenues
Segment Reporting Information [Line Items]
RNF from external customers	1,836	2,041
Intersegment Revenues | Mid-Atlantic
Segment Reporting Information [Line Items]
Intersegment Revenue Net Of Purchase Power And Fuel	(31)	(1)
Intersegment Revenues | Midwest
Segment Reporting Information [Line Items]
Intersegment Revenue Net Of Purchase Power And Fuel	(1)	0
Intersegment Revenues | New York
Segment Reporting Information [Line Items]
Intersegment Revenue Net Of Purchase Power And Fuel	36	8
Intersegment Revenues | ERCOT
Segment Reporting Information [Line Items]
Intersegment Revenue Net Of Purchase Power And Fuel	(1)	(27)
Intersegment Revenues | Other Power Regions
Segment Reporting Information [Line Items]
Intersegment Revenue Net Of Purchase Power And Fuel	(8)	(10)
Intersegment Revenues | Total Competitive Businesses Electric Revenues
Segment Reporting Information [Line Items]
Intersegment Revenue Net Of Purchase Power And Fuel	(5)	(30)
Intersegment Revenues | Other
Segment Reporting Information [Line Items]
Intersegment Revenue Net Of Purchase Power And Fuel	5	30
Intersegment Revenues | Total Consolidated Operating Revenues
Segment Reporting Information [Line Items]
Intersegment Revenue Net Of Purchase Power And Fuel	$ 0	$ 0

Accounts Receivable - Narrative

Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Aug. 16, 2022	Jan. 31, 2022	Apr. 08, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenues	$ 364	$ 564
Credit facility	$ 5,912			$ 4,500
Sale of Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit facility			$ 1,100		$ 900

Accounts Receivable - Purchases

Accounts Receivable - Purchases and Sales of Accounts Receivable (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loss on sale of receivables	$ 20	$ 10
Proceeds from new transfers	1,957	1,654
Cash collections received on DPP and reinvested in the Facility	926	853
Cash collections reinvested in the Facility	2,883	2,507
Total receivables sold	184	69
Sale of Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Derecognized receivables transferred at fair value	1,474		$ 1,615
Cash proceeds received	1,100		1,100
DPP	374		$ 515
Customer accounts receivable sold into the Facility	$ 2,750	$ 2,572

Nuclear Decommissioning - Nucle

Nuclear Decommissioning - Nuclear Decommissioning Asset Retirement Obligation Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion expense	$ 143	$ 132
Nuclear Decommissioning
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO beginning balance	12,500
Accretion expense	139
Costs incurred related to decommissioning plants	(8)
ARO ending balance	12,631
Current portion of ARO	$ 36		$ 40

Nuclear Decommissioning - Narra

Nuclear Decommissioning - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Jan. 31, 2022
Asset Retirement Obligations [Line Items]
Nuclear decommissioning trust funds	$ 14,606	$ 14,114
Nine Mile Point
Asset Retirement Obligations [Line Items]
Nuclear decommissioning trust funds			$ 15
Assets, Total
Asset Retirement Obligations [Line Items]
Nuclear decommissioning trust funds	14,676	14,127
Other Current Assets
Asset Retirement Obligations [Line Items]
Nuclear decommissioning trust funds	$ 70	$ 13

Nuclear Decommissioning - Noncu

Nuclear Decommissioning - Noncurrent Related Party Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Asset Retirement Obligations [Line Items]
Payables related to Regulatory Agreement Units	$ 3,069	$ 2,897
ComEd
Asset Retirement Obligations [Line Items]
Payables related to Regulatory Agreement Units	2,804	2,660
PECO
Asset Retirement Obligations [Line Items]
Payables related to Regulatory Agreement Units	$ 265	$ 237

Income Taxes - Reconciliation t

Income Taxes - Reconciliation to Effective Tax Rate (Details)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21%	21%
Increase (decrease) due to:
State income taxes, net of federal income tax benefit	3.30%	55.20%
Qualified NDT fund income and losses	33.70%	(127.50%)
Effective Income Tax Rate Reconciliation, Investment Tax Credit Amortization, Percent	(0.70%)	(9.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	(0.80%)	(34.80%)
Noncontrolling interests	0%	(1.00%)
Other	(1.50%)	9.40%
Effective income tax rate	55%	(86.90%)

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Other	$ 542	$ 731
Other deferred debits and other assets	1,977	2,106
Separation from Parent
Income Taxes [Line Items]
Payable for tax liabilities upon separation	32	32
Other	212	168
Other deferred debits and other assets	319	362
Separation from Parent | Other Receivables, Net, Current
Income Taxes [Line Items]
Payable for tax liabilities upon separation	18	18
Separation from Parent | Other Noncurrent Liabilities
Income Taxes [Line Items]
Payable for tax liabilities upon separation	$ 50	$ 50

Retirement Benefits - Net Benef

Retirement Benefits - Net Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Contribution Plan Disclosure [Line Items]
Service cost	$ 26	$ 39
Interest cost	117	83
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(138)	(151)
Prior service cost (credit)	(2)	(2)
Actuarial loss (gain)	9	38
Non-service components of pension benefits & OPEB (credit) cost	(14)	(32)
Net periodic benefit cost	12	7
Pension Benefits
Defined Contribution Plan Disclosure [Line Items]
Service cost	22	33
Interest cost	99	70
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(127)	(137)
Prior service cost (credit)	0	0
Actuarial loss (gain)	12	38
Non-service components of pension benefits & OPEB (credit) cost	(16)	(29)
Net periodic benefit cost	6	4
OPEB
Defined Contribution Plan Disclosure [Line Items]
Service cost	4	6
Interest cost	18	13
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(11)	(14)
Prior service cost (credit)	(2)	(2)
Actuarial loss (gain)	(3)	0
Non-service components of pension benefits & OPEB (credit) cost	2	(3)
Net periodic benefit cost	6	3
Pension Plan and Other Postretirement Benefits Plan
Defined Contribution Plan Disclosure [Line Items]
Non-service components of pension benefits & OPEB (credit) cost	(14)	(25)
Net periodic benefit cost	$ 24	$ 30

Retirement Benefits - Narrative

Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Contribution Plan Disclosure [Line Items]
Offset to accumulated other comprehensive loss (after tax)	$ 53	$ 0
Pension Benefits
Defined Contribution Plan Disclosure [Line Items]
Increase in obligation	48
OPEB
Defined Contribution Plan Disclosure [Line Items]
Increase in obligation	$ 21

Derivative Financial Instrume_3

Derivative Financial Instruments - Summary of Derivative Fair Value Balances (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	$ 1,952	$ 2,368
Mark-to-market derivative assets (noncurrent assets)	1,125	1,261
Mark-to-market derivative liabilities (current liabilities)	(1,573)	(1,558)
Mark-to-market derivative liabilities (noncurrent liabilities)	(700)	(983)
Variation margin	295	836
Commodity Contract
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	1,929	2,344
Mark-to-market derivative assets (noncurrent assets)	1,114	1,243
Total mark-to-market derivative assets	3,043	3,587
Mark-to-market derivative liabilities (current liabilities)	(1,573)	(1,558)
Mark-to-market derivative liabilities (noncurrent liabilities)	(700)	(983)
Total mark-to-market derivative liabilities	(2,273)	(2,541)
Total mark-to-market derivative net assets (liabilities)	770	1,046
Commodity Contract | Collateral
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	362	161
Mark-to-market derivative assets (noncurrent assets)	153	217
Total mark-to-market derivative assets	515	378
Mark-to-market derivative liabilities (current liabilities)	443	374
Mark-to-market derivative liabilities (noncurrent liabilities)	205	146
Total mark-to-market derivative liabilities	648	520
Total mark-to-market derivative net assets (liabilities)	1,163	898
Commodity Contract | Netting
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	(8,627)	(13,123)
Mark-to-market derivative assets (noncurrent assets)	(3,275)	(4,074)
Total mark-to-market derivative assets	(11,902)	(17,197)
Mark-to-market derivative liabilities (current liabilities)	8,628	13,123
Mark-to-market derivative liabilities (noncurrent liabilities)	3,274	4,074
Total mark-to-market derivative liabilities	11,902	17,197
Total mark-to-market derivative net assets (liabilities)	0	0
Commodity Contract | Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	10,189	15,296
Mark-to-market derivative assets (noncurrent assets)	4,236	5,100
Total mark-to-market derivative assets	14,425	20,396
Mark-to-market derivative liabilities (current liabilities)	(10,641)	(15,049)
Mark-to-market derivative liabilities (noncurrent liabilities)	(4,179)	(5,203)
Total mark-to-market derivative liabilities	(14,820)	(20,252)
Total mark-to-market derivative net assets (liabilities)	(395)	144
Commodity Contract | Not Designated as Hedging Instrument, Propriety Trading
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	5	10
Mark-to-market derivative assets (noncurrent assets)	0	0
Total mark-to-market derivative assets	5	10
Mark-to-market derivative liabilities (current liabilities)	(3)	(6)
Mark-to-market derivative liabilities (noncurrent liabilities)	0	0
Total mark-to-market derivative liabilities	(3)	(6)
Total mark-to-market derivative net assets (liabilities)	2	4
Interest Rate Swap
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	23	24
Mark-to-market derivative assets (noncurrent assets)	11	18
Total mark-to-market derivative assets	34	42
Mark-to-market derivative liabilities (current liabilities)	0	0
Mark-to-market derivative liabilities (noncurrent liabilities)	0	0
Total mark-to-market derivative liabilities	0	0
Total mark-to-market derivative net assets (liabilities)	34	42
Interest Rate Swap | Netting
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	(2)	(5)
Mark-to-market derivative assets (noncurrent assets)	0	0
Total mark-to-market derivative assets	(2)	(5)
Mark-to-market derivative liabilities (current liabilities)	2	5
Mark-to-market derivative liabilities (noncurrent liabilities)	0	0
Total mark-to-market derivative liabilities	2	5
Total mark-to-market derivative net assets (liabilities)	0	0
Interest Rate Swap | Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Mark-to-market derivative assets (current assets)	25	29
Mark-to-market derivative assets (noncurrent assets)	11	18
Total mark-to-market derivative assets	36	47
Mark-to-market derivative liabilities (current liabilities)	(2)	(5)
Mark-to-market derivative liabilities (noncurrent liabilities)	0	0
Total mark-to-market derivative liabilities	(2)	(5)
Total mark-to-market derivative net assets (liabilities)	$ 34	$ 42

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Derivative [Line Items]
Total	$ (273)	$ (75)
Not Designated as Hedging Instrument, Economic Hedge | Commodity Contract
Derivative [Line Items]
Total	(263)	(93)
Not Designated as Hedging Instrument, Economic Hedge | Commodity Contract | Operating revenues
Derivative [Line Items]
Total	930	(919)
Not Designated as Hedging Instrument, Economic Hedge | Commodity Contract | Purchased power and fuel
Derivative [Line Items]
Total	$ (1,193)	$ 826

Derivative Financial Instrume_5

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Not Designated as Hedging Instrument, Economic Hedge | Interest Rate Swap
Derivative [Line Items]
Notional amount	$ 493	$ 524
Minimum
Derivative [Line Items]
Expected generation hedged in next twelve months	95%
Expected generation hedged in year two	77%
Maximum
Derivative [Line Items]
Expected generation hedged in next twelve months	98%
Expected generation hedged in year two	80%

Derivative Financial Instrume_6

Derivative Financial Instruments - Summary of Credit Risk Exposure (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) counterparty
Derivative [Line Items]
Cash collateral	$ 41
Letters of credit held	52
Total Exposure Before Credit Collateral
Derivative [Line Items]
Total	1,462
Total Exposure Before Credit Collateral | Internally rated — investment grade
Derivative [Line Items]
Total	179
Total Exposure Before Credit Collateral | Internally rated — non-investment grade
Derivative [Line Items]
Total	325
Total Exposure Before Credit Collateral | Investment grade
Derivative [Line Items]
Total	950
Total Exposure Before Credit Collateral | Non-investment grade
Derivative [Line Items]
Total	8
Credit Collateral
Derivative [Line Items]
Total	93
Credit Collateral | Internally rated — investment grade
Derivative [Line Items]
Total	0
Credit Collateral | Internally rated — non-investment grade
Derivative [Line Items]
Total	30
Credit Collateral | Investment grade
Derivative [Line Items]
Total	63
Credit Collateral | Non-investment grade
Derivative [Line Items]
Total	0
Net Exposure
Derivative [Line Items]
Total	1,369
Net Exposure | Investor-owned utilities, marketers, power producers
Derivative [Line Items]
Total	1,074
Net Exposure | Energy cooperatives and municipalities
Derivative [Line Items]
Total	174
Net Exposure | Financial Institutions
Derivative [Line Items]
Total	27
Net Exposure | Other
Derivative [Line Items]
Total	94
Net Exposure | Internally rated — investment grade
Derivative [Line Items]
Total	179
Net Exposure | Internally rated — non-investment grade
Derivative [Line Items]
Total	295
Net Exposure | Investment grade
Derivative [Line Items]
Total	887
Net Exposure | Non-investment grade
Derivative [Line Items]
Total	$ 8
Number of Counterparties Greater than 10% of Net Exposure
Derivative [Line Items]
Number of counterparties | counterparty	0
Number of Counterparties Greater than 10% of Net Exposure | Internally rated — investment grade
Derivative [Line Items]
Number of counterparties | counterparty	0
Number of Counterparties Greater than 10% of Net Exposure | Internally rated — non-investment grade
Derivative [Line Items]
Number of counterparties | counterparty	0
Number of Counterparties Greater than 10% of Net Exposure | Investment grade
Derivative [Line Items]
Number of counterparties | counterparty	0
Number of Counterparties Greater than 10% of Net Exposure | Non-investment grade
Derivative [Line Items]
Number of counterparties | counterparty	0
Net Exposure of Counterparties Greater than 10% of Net Exposure
Derivative [Line Items]
Total	$ 0
Net Exposure of Counterparties Greater than 10% of Net Exposure | Internally rated — investment grade
Derivative [Line Items]
Total	0
Net Exposure of Counterparties Greater than 10% of Net Exposure | Internally rated — non-investment grade
Derivative [Line Items]
Total	0
Net Exposure of Counterparties Greater than 10% of Net Exposure | Investment grade
Derivative [Line Items]
Total	0
Net Exposure of Counterparties Greater than 10% of Net Exposure | Non-investment grade
Derivative [Line Items]
Total	$ 0

Derivative Financial Instrume_7

Derivative Financial Instruments - Summary of Credit Risk Related Contingent Features (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross fair value of derivative contracts containing this feature	$ (2,683)	$ (4,736)
Offsetting fair value of in-the-money contracts under master netting arrangements	987	2,048
Net fair value of derivative contracts containing this feature	$ (1,696)	$ (2,688)

Derivative Financial Instrume_8

Derivative Financial Instruments - Summary of Cash Collateral and Letters of Credit (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral posted	$ 1,898	$ 1,636
Letters of credit posted	672	947
Cash collateral held	755	765
Letters of credit held	71	115
Additional collateral required in the event of a credit downgrade below investment grade (at BB+/Ba1)	$ 2,405	$ 3,337

Debt and Credit Agreements - Co

Debt and Credit Agreements - Commercial Paper Borrowings (Details) - Commercial Paper - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Outstanding Commercial Paper as of	$ 205	$ 959
Weighted Average Interest Rate on Commercial Paper Borrowings as of	5.09%	4.90%

Debt and Credit Agreements - Na

Debt and Credit Agreements - Narrative (Details) - USD ($) $ in Millions	Feb. 09, 2023	Jan. 26, 2023	Mar. 29, 2022	Feb. 01, 2022	Jan. 31, 2022	Apr. 03, 2023	Mar. 31, 2023	Dec. 31, 2022	Feb. 09, 2022	Mar. 31, 2020
Schedule of line of credit, short term, and long term debt [Line Items]
Credit facility					$ 4,500		$ 5,912
Short term loan agreement					200		705	$ 1,159
Exelon Corporate
Schedule of line of credit, short term, and long term debt [Line Items]
Repayments of related party debt					258
Revolving Credit Facility
Schedule of line of credit, short term, and long term debt [Line Items]
Credit facility				$ 3,500			3,500
Liquidity Facility
Schedule of line of credit, short term, and long term debt [Line Items]
Credit facility							$ 971		$ 1,000
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility
Schedule of line of credit, short term, and long term debt [Line Items]
Basis spread				1.275%
Term Loan | Unsecured Debt
Schedule of line of credit, short term, and long term debt [Line Items]
Short term loan agreement	$ 400	$ 100	$ 200							$ 300
Repayments of short-term debt			$ 100
Term Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Unsecured Debt
Schedule of line of credit, short term, and long term debt [Line Items]
Basis spread	1.05%	0.80%	0.80%
The Bonds | Subsequent Event
Schedule of line of credit, short term, and long term debt [Line Items]
Principal amount						$ 435
The Bonds | Subsequent Event | Minimum
Schedule of line of credit, short term, and long term debt [Line Items]
Interest rate						4.10%
The Bonds | Subsequent Event | Maximum
Schedule of line of credit, short term, and long term debt [Line Items]
Interest rate						4.45%
Related Party Debt
Schedule of line of credit, short term, and long term debt [Line Items]
Membership interest					$ 61

Debt and Credit Agreements - Su

Debt and Credit Agreements - Summary of Bank Commitments, Credit Facility Borrowings and Available Capacity (Details) - USD ($) $ in Millions	Mar. 31, 2023	Mar. 29, 2023	Jan. 20, 2023	Aug. 24, 2022	Feb. 09, 2022	Feb. 01, 2022	Jan. 31, 2022	Jan. 31, 2021	May 15, 2020
Short-term Debt [Line Items]
Aggregate Bank Commitment	$ 5,912						$ 4,500
Facility Draws	0
Outstanding Letters of Credit	1,665
Actual Available Capacity	4,147
To Support Additional Commercial Paper Available Capacity	3,099
Revolving Credit Facility
Short-term Debt [Line Items]
Aggregate Bank Commitment	3,500					$ 3,500
Facility Draws	0
Outstanding Letters of Credit	196
Actual Available Capacity	3,304
To Support Additional Commercial Paper Available Capacity	3,099
Bilateral Credit Agreements
Short-term Debt [Line Items]
Aggregate Bank Commitment	1,310
Facility Draws	0
Outstanding Letters of Credit	785
Actual Available Capacity	525
To Support Additional Commercial Paper Available Capacity	0
Liquidity Facility
Short-term Debt [Line Items]
Aggregate Bank Commitment	971				$ 1,000
Facility Draws	0
Outstanding Letters of Credit	576
Actual Available Capacity	295
To Support Additional Commercial Paper Available Capacity	0
Liquidity Facility | No Additional Collateral Posted
Short-term Debt [Line Items]
Actual Available Capacity	871
Secured debt
Short-term Debt [Line Items]
Aggregate Bank Commitment	131
Facility Draws	0
Outstanding Letters of Credit	108
Actual Available Capacity	23
To Support Additional Commercial Paper Available Capacity	0
Bilateral Credit Agreement, August 2022
Short-term Debt [Line Items]
Aggregate Bank Commitment			$ 10	$ 100
Bilateral Credit Agreement, March 2023
Short-term Debt [Line Items]
Aggregate Bank Commitment		$ 100
Bilateral Credit Agreement, May 2020
Short-term Debt [Line Items]
Aggregate Bank Commitment	$ 300							$ 250	$ 200

Debt and Credit Agreements - _2

Debt and Credit Agreements - Summary of Outstanding Long-term Debt (Details) $ in Millions	Mar. 31, 2023 USD ($)
Energy Efficiency Project Financing
Debt Instrument [Line Items]
Amount	$ 3
Minimum | Energy Efficiency Project Financing
Debt Instrument [Line Items]
Interest Rate	2.20%
Maximum | Energy Efficiency Project Financing
Debt Instrument [Line Items]
Interest Rate	4.96%
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Interest Rate	5.60%
Amount	$ 750
Senior Notes | 2033 Senior Notes
Debt Instrument [Line Items]
Interest Rate	5.80%
Amount	$ 600
Nonrecourse | Continental Wind
Debt Instrument [Line Items]
Interest Rate	6%
Amount	$ 15
Nonrecourse | West Medway II, LLC
Debt Instrument [Line Items]
Interest Rate	2.875%
Amount	$ 7
Nonrecourse | Antelope Valley DOE Loan
Debt Instrument [Line Items]
Amount	$ 6
Nonrecourse | RPG Debt
Debt Instrument [Line Items]
Interest Rate	4.11%
Amount	$ 2
Nonrecourse | Minimum | Antelope Valley DOE Loan
Debt Instrument [Line Items]
Interest Rate	2.29%
Nonrecourse | Maximum | Antelope Valley DOE Loan
Debt Instrument [Line Items]
Interest Rate	3.56%

Fair Value of Financial Asset_3

Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
SNF Obligation	$ 1,244	$ 1,230
Carrying Amount
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including amounts due within one year	5,924	4,609
SNF Obligation	1,244	1,230
Fair Value
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including amounts due within one year	5,984	4,547
SNF Obligation	1,082	1,021
Fair Value | Level 2
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including amounts due within one year	5,123	3,688
SNF Obligation	1,082	1,021
Fair Value | Level 3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt, including amounts due within one year	861	859
SNF Obligation	$ 0	$ 0

Fair Value of Financial Asset_4

Fair Value of Financial Assets and Liabilities - Fair Value Measurement of Assets and Liabilities, Recurring (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Net derivative assets	$ 1	$ 1
Derivative asset notational amounts	530	494
Variation margin	295	836
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	222	390
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	222	390
Cash and Cash Equivalents | CEG Parent
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	38	49
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	38	49
Restricted cash | Constellation Energy Generation, LLC
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	75	70
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	75	70
Cash | CEG Parent
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	1	19
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	1	19
NDT fund investments subtotal | Maturity Less than 30 Days
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash	106	99
NDT fund investments subtotal
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Investments in equities sold short	(46)	(45)
Net liabilities	110	168
Notional amount	163	59
Fair Value, Recurring
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	30	41
DPP	374	515
Total assets	18,344	18,554
Deferred compensation obligation	(57)	(57)
Total liabilities	(2,330)	(2,598)
Total net assets (liabilities)	16,014	15,956
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	30	41
Fair Value, Recurring | Commodity derivative liabilities subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(2,273)	(2,541)
Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(14,822)	(20,257)
Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(3)	(6)
Fair Value, Recurring | Effect of netting and allocation of collateral
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	12,552	17,722
Fair Value, Recurring | NDT fund investments subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	14,786	14,295
Fair Value, Recurring | Cash equivalents NDT
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	615	437
Fair Value, Recurring | Equities NDT
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	6,707	6,381
Fair Value, Recurring | Fixed income subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	5,025	4,974
Fair Value, Recurring | Corporate debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,126	1,149
Fair Value, Recurring | U.S. Treasury and agencies
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,940	2,042
Fair Value, Recurring | Foreign governments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	46	39
Fair Value, Recurring | State and municipal debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	52	53
Fair Value, Recurring | Other
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,861	1,691
Fair Value, Recurring | Private credit
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	781	802
Fair Value, Recurring | Private equity
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	681	687
Fair Value, Recurring | Real estate
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	977	1,014
Fair Value, Recurring | Rabbi trust investments subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	72	68
Fair Value, Recurring | Cash equivalents
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1	1
Fair Value, Recurring | Mutual funds
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	41	39
Fair Value, Recurring | Life insurance contracts
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	30	28
Fair Value, Recurring | Investments in equities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	5	6
Fair Value, Recurring | Commodity derivative assets subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	3,077	3,629
Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	14,461	20,443
Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	5	10
Fair Value, Recurring | Effect of netting and allocation of collateral
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	(11,389)	(16,824)
Level 1
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Collateral posted (received) from counterparties	437	328
Level 1 | Fair Value, Recurring
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	30	41
DPP	0	0
Total assets	6,878	6,469
Deferred compensation obligation	0	0
Total liabilities		(108)
Total liabilities	(33)
Total net assets (liabilities)	6,845	6,577
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	30	41
Level 1 | Fair Value, Recurring | Commodity derivative liabilities subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(33)	108
Level 1 | Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(2,804)	(3,171)
Level 1 | Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity 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]
Commodity derivative liabilities	2,771	3,279
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	6,406	5,828
Level 1 | Fair Value, Recurring | Cash equivalents NDT
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	530	349
Level 1 | Fair Value, Recurring | Equities NDT
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	3,971	3,462
Level 1 | Fair Value, Recurring | Fixed income subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,905	2,017
Level 1 | Fair Value, Recurring | Corporate debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 1 | Fair Value, Recurring | U.S. Treasury and agencies
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,883	1,996
Level 1 | Fair Value, Recurring | Foreign governments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 1 | Fair Value, Recurring | State and municipal debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 1 | Fair Value, Recurring | Other
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	22	21
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 | Private equity
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 1 | Fair Value, Recurring | Real estate
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 subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	42	40
Level 1 | Fair Value, Recurring | Cash equivalents
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1	1
Level 1 | Fair Value, Recurring | Mutual funds
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	41	39
Level 1 | Fair Value, Recurring | Life insurance contracts
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 1 | Fair Value, Recurring | Investments in equities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	5	6
Level 1 | Fair Value, Recurring | Commodity derivative assets subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	395	554
Level 1 | Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	2,729	3,505
Level 1 | Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity 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]
Commodity derivative assets	(2,334)	(2,951)
Level 2
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Collateral posted (received) from counterparties	472	352
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	374	515
Total assets	4,041	4,181
Deferred compensation obligation	(57)	(57)
Total liabilities	(1,289)	(859)
Total net assets (liabilities)	2,752	3,322
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	0	0
Level 2 | Fair Value, Recurring | Commodity derivative liabilities subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(1,232)	(802)
Level 2 | Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(8,099)	(11,498)
Level 2 | Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(2)	(4)
Level 2 | Fair Value, Recurring | Effect of netting and allocation of collateral
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	6,869	10,700
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	2,711	2,630
Level 2 | Fair Value, Recurring | Cash equivalents NDT
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	85	88
Level 2 | Fair Value, Recurring | Equities NDT
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,592	1,498
Level 2 | Fair Value, Recurring | Fixed income subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,034	1,044
Level 2 | Fair Value, Recurring | Corporate debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	860	885
Level 2 | Fair Value, Recurring | U.S. Treasury and agencies
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	57	46
Level 2 | Fair Value, Recurring | Foreign governments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	46	39
Level 2 | Fair Value, Recurring | State and municipal debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	52	53
Level 2 | Fair Value, Recurring | Other
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	19	21
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 | Private equity
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 2 | Fair Value, Recurring | Real estate
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 subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	29	27
Level 2 | Fair Value, Recurring | Cash equivalents
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 2 | Fair Value, Recurring | Mutual funds
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 2 | Fair Value, Recurring | Life insurance contracts
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	29	27
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 | Commodity derivative assets subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	927	1,009
Level 2 | Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	7,322	11,353
Level 2 | Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	2	4
Level 2 | Fair Value, Recurring | Effect of netting and allocation of collateral
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	(6,397)	(10,348)
Level 3
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Collateral posted (received) from counterparties	254	218
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	0	0
Total assets	2,177	2,490
Deferred compensation obligation	0	0
Total liabilities	(1,008)	(1,847)
Total net assets (liabilities)	1,169	643
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	0	0
Level 3 | Fair Value, Recurring | Commodity derivative liabilities subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(1,008)	(1,847)
Level 3 | Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	(3,919)	(5,588)
Level 3 | Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity 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]
Commodity derivative liabilities	2,912	3,743
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	421	423
Level 3 | Fair Value, Recurring | Cash equivalents NDT
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	0	0
Level 3 | Fair Value, Recurring | Fixed income subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	266	264
Level 3 | Fair Value, Recurring | Corporate debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	266	264
Level 3 | Fair Value, Recurring | U.S. Treasury and agencies
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 3 | Fair Value, Recurring | Foreign governments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 3 | Fair Value, Recurring | State and municipal debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 3 | Fair Value, Recurring | Other
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 3 | Fair Value, Recurring | Private credit
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	155	159
Level 3 | Fair Value, Recurring | Private equity
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 3 | Fair Value, Recurring | Real estate
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 3 | Fair Value, Recurring | Rabbi trust investments subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1	1
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 | Mutual funds
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Level 3 | Fair Value, Recurring | Life insurance contracts
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 | Commodity derivative assets subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	1,755	2,066
Level 3 | Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	4,410	5,585
Level 3 | Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	3	6
Level 3 | Fair Value, Recurring | Effect of netting and allocation of collateral
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	(2,658)	(3,525)
Not subject to leveling | Fair Value, Recurring
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	0	0
DPP	0	0
Total assets	5,248	5,414
Deferred compensation obligation	0	0
Total liabilities	0	0
Total net assets (liabilities)	5,248	5,414
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis [Abstract]
Cash equivalents, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Commodity derivative liabilities subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	0	0
Not subject to leveling | Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	0	0
Not subject to leveling | Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	0	0
Not subject to leveling | Fair Value, Recurring | Effect of netting and allocation of collateral
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative liabilities	0	0
Not subject to leveling | Fair Value, Recurring | NDT fund investments subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	5,248	5,414
Not subject to leveling | Fair Value, Recurring | Cash equivalents NDT
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Equities NDT
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,144	1,421
Not subject to leveling | Fair Value, Recurring | Fixed income subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,820	1,649
Not subject to leveling | Fair Value, Recurring | Corporate debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | U.S. Treasury and agencies
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Foreign governments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | State and municipal debt
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Other
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	1,820	1,649
Not subject to leveling | Fair Value, Recurring | Private credit
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	626	643
Not subject to leveling | Fair Value, Recurring | Private equity
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	681	687
Not subject to leveling | Fair Value, Recurring | Real estate
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	977	1,014
Not subject to leveling | Fair Value, Recurring | Rabbi trust investments subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Cash equivalents
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Mutual funds
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Life insurance contracts
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Investments in equities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, fair value disclosure	0	0
Not subject to leveling | Fair Value, Recurring | Commodity derivative assets subtotal
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	0	0
Not subject to leveling | Fair Value, Recurring | Economic hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	0	0
Not subject to leveling | Fair Value, Recurring | Proprietary trading
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	0	0
Not subject to leveling | Fair Value, Recurring | Effect of netting and allocation of collateral
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Commodity derivative assets	$ 0	$ 0

Fair Value of Financial Asset_5

Fair Value of Financial Assets and Liabilities - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments without determinable fair values	$ 56	$ 46
Private credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding commitments	231
Private equity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding commitments	126
Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding commitments	$ 376

Fair Value of Financial Asset_6

Fair Value of Financial Assets and Liabilities - Fair Value Reconciliation of Level 3 Assets and Liabilities Measured on a Recurring Basis (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning Balance	$ 643	$ 370
Total realized / unrealized gains (losses)
Included in net income	506	(1,011)
Included in noncurrent payables to affiliates		(2)
Change in collateral	35	(262)
Impacts of separation		3
Purchases, sales, issuances and settlements
Purchases	66	49
Sales	(4)	(26)
Settlements	(2)	0
Transfers into Level 3	(8)	101
Transfers out of Level 3	(67)	(35)
Ending Balance	1,169	(813)
The amount of total (losses) gains included in income attributed to the change in unrealized (losses) gains related to assets and liabilities	712	(1,019)
NDT fund investments subtotal
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning Balance	423	464
Total realized / unrealized gains (losses)
Included in net income	0	0
Included in noncurrent payables to affiliates		(2)
Change in collateral	0	0
Impacts of separation		0
Purchases, sales, issuances and settlements
Purchases	0	0
Sales	0	0
Settlements	(2)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	421	462
The amount of total (losses) gains included in income attributed to the change in unrealized (losses) gains related to assets and liabilities	0	0
Mark-to-Market Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning Balance	219	(94)
Total realized / unrealized gains (losses)
Included in net income	506	(1,011)
Included in noncurrent payables to affiliates		0
Change in collateral	35	(262)
Impacts of separation		0
Purchases, sales, issuances and settlements
Purchases	66	49
Sales	(4)	(26)
Settlements	0	0
Transfers into Level 3	(8)	101
Transfers out of Level 3	(67)	(35)
Ending Balance	747	(1,278)
The amount of total (losses) gains included in income attributed to the change in unrealized (losses) gains related to assets and liabilities	712	(1,019)
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Realized gains (losses)	206	(8)
Life insurance contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning Balance	1	0
Total realized / unrealized gains (losses)
Included in net income	0	0
Included in noncurrent payables to affiliates		0
Change in collateral	0
Impacts of separation		3
Purchases, sales, issuances and settlements
Purchases	0	0
Sales	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	1	3
The amount of total (losses) gains included in income attributed to the change in unrealized (losses) gains related to assets and liabilities	$ 0	$ 0

Fair Value of Financial Asset_7

Fair Value of Financial Assets and Liabilities - Fair Value Assets and Liabilities Measure on a Recurring Basis Gain Loss Included in Earnings (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items]
Total (losses) gains included in net income	$ (506)	$ 1,011
Total unrealized (losses) gains	712	(1,019)
Operating revenues
Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items]
Total (losses) gains included in net income	547	(1,021)
Total unrealized (losses) gains	839	(1,221)
Purchased power and fuel
Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items]
Total (losses) gains included in net income	(41)	10
Total unrealized (losses) gains	(127)	202
Other, net
Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items]
Total (losses) gains included in net income	0	0
Total unrealized (losses) gains	$ 0	$ 0

Fair Value of Financial Asset_8

Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) - Level 3 $ in Millions	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Cash collateral received	$ 254	$ 218
Economic Hedges
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Mark-to-market derivatives—Economic hedges	$ 491	$ (3)
Economic Hedges | Minimum | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Forward power price	(0.75)	0.63
Forward gas price	1.75	1.67
Economic Hedges | Minimum | Option  Model
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Volatility percentage	1.14	0.97
Economic Hedges | Maximum | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Forward power price	196	283
Forward gas price	17	26
Economic Hedges | Maximum | Option  Model
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Volatility percentage	1.19	1.19
Economic Hedges | Average | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Forward power price	55	72
Forward gas price	4.01	4.57
Economic Hedges | Average | Option  Model
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Volatility percentage	1.16	1.11

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Commercial Commitments (Details) $ in Millions	Mar. 31, 2023 USD ($)
Guarantor Obligations [Line Items]
Total	$ 2,651
2023	2,224
2024	389
2025	0
2026	0
2027	38
2028 and beyond	0
Letters of credit
Guarantor Obligations [Line Items]
Total	1,665
2023	1,382
2024	245
2025	0
2026	0
2027	38
2028 and beyond	0
Surety bonds
Guarantor Obligations [Line Items]
Total	986
2023	842
2024	144
2025	0
2026	0
2027	0
2028 and beyond	$ 0

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) $ in Millions	Apr. 30, 2023 USD ($)	Mar. 31, 2023 USD ($) Open_claim	Dec. 31, 2022 USD ($)	Aug. 03, 2020 USD ($)
Commitments and Contingencies [Line Items]
Accrued undiscounted amounts		$ 129	$ 119
Estimated liabilities for asbestos-related bodily injury claims		91	$ 95
Open Claims
Commitments and Contingencies [Line Items]
Estimated liabilities for asbestos-related bodily injury claims		$ 23
Number of claims | Open_claim		257
Estimated Future Claims
Commitments and Contingencies [Line Items]
Estimated liabilities for asbestos-related bodily injury claims		$ 68
Latty Avenue
Commitments and Contingencies [Line Items]
Environmental loss contingencies				$ 90
Latty Avenue | Subsequent Event
Commitments and Contingencies [Line Items]
Environmental loss contingencies	$ 90

Shareholders' Equity - Narrativ

Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Feb. 16, 2023
Statement of Stockholders' Equity [Abstract]
Value of stock authorized for repurchase		$ 1,000
Common stock repurchased (in shares)	3.2
Common stock repurchased	$ 251
Common stock repurchased (in dollars per share)	$ 76.73
Remaining shares available for repurchase	749

Shareholders' Equity - Schedule

Shareholders' Equity - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended
	Jan. 31, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 11,614	$ 0	$ 11,372	$ 11,614
Separation-related adjustments	(197)
Other comprehensive (loss) income, net of income taxes		21	(48)	21
Ending balance	0	11,505	11,086	11,505
Losses on Cash Flow Hedges
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(8)		(9)	(8)
Separation-related adjustments				0
OCI before reclassifications			0	0
Amounts reclassified from AOCI			0	0
Other comprehensive (loss) income, net of income taxes			0	0
Ending balance		(8)	(9)	(8)
Pension and Non-Pension Postretirement Benefit Plan Items
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	0		(1,725)	0
Separation-related adjustments				(2,006)
OCI before reclassifications			(53)	0
Amounts reclassified from AOCI			5	17
Other comprehensive (loss) income, net of income taxes			(48)	(1,989)
Ending balance		(1,989)	(1,773)	(1,989)
Foreign Currency Items
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(23)		(26)	(23)
Separation-related adjustments				0
OCI before reclassifications			0	4
Amounts reclassified from AOCI			0	0
Other comprehensive (loss) income, net of income taxes			0	4
Ending balance		(19)	(26)	(19)
Total
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (31)		(1,760)	(31)
Separation-related adjustments				(2,006)
OCI before reclassifications			(53)	4
Amounts reclassified from AOCI			5	17
Other comprehensive (loss) income, net of income taxes			(48)	(1,985)
Ending balance		$ (2,016)	$ (1,808)	$ (2,016)

Shareholders' Equity - Income T

Shareholders' Equity - Income Taxes Allocated to Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Actuarial loss reclassified to periodic benefit cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension and non-pension postretirement benefit plans valuation adjustment	$ (2)	$ (6)
Pension and Non-Pension Postretirement Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pension and non-pension postretirement benefit plans valuation adjustment	$ 18	$ 680

Variable Interest Entities - As

Variable Interest Entities - Assets and Liabilities of Consolidated VIEs (Details) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents		$ 237	$ 422	$ 1,605	$ 504
Restricted cash and cash equivalents		99	106	$ 91	$ 72
Accounts receivable
Customer		2,147	2,585
Other		542	731
Inventories, net
Materials and supplies		1,085	1,076
Other current assets		1,067	1,026
Total current assets		8,108	9,360
Property, plant and equipment, net		20,074	19,822
Other noncurrent assets		1,977	2,106
Total assets	[1]	46,158	46,909
Current liabilities
Long-term debt due within one year		161	143
Accounts payable		1,558	2,828
Accrued expenses		743	906
Other current liabilities		342	344
Total current liabilities		5,947	7,839
Long-term debt		5,763	4,466
Other noncurrent liabilities		1,258	1,178
Total deferred credits and other liabilities		23,362	23,232
Total liabilities	[1]	35,072	35,537
Recourse
Current liabilities
Total liabilities		1	1
Variable Interest Entity, Primary Beneficiary
Current assets
Cash and cash equivalents		55	51
Restricted cash and cash equivalents		32	46
Accounts receivable
Customer		27	20
Other		7	9
Inventories, net
Materials and supplies		13	12
Other current assets		406	549
Total current assets		540	687
Property, plant and equipment, net		1,977	1,965
Other noncurrent assets		184	190
Total noncurrent assets		2,161	2,155
Total assets		2,701	2,842
Current liabilities
Long-term debt due within one year		61	60
Accounts payable		42	17
Accrued expenses		11	23
Other current liabilities		1	2
Total current liabilities		115	102
Long-term debt		741	764
Asset retirement obligations		175	173
Other noncurrent liabilities		3	3
Total deferred credits and other liabilities		919	940
Total liabilities		1,034	1,042
Unamortized energy contract assets, current		23	23
Unamortized energy contract assets, noncurrent		$ 172	$ 178
[1]Our consolidated assets include $2,506 million and $2,641 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Our consolidated liabilities include $1,033 million and $1,041 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs for which the VIE creditors do not have recourse to us. See Note 14 — Variable Interest Entities for additional information.

Variable Interest Entities - Na

Variable Interest Entities - Narrative (Details) - Constellation Energy Generation, LLC	Mar. 31, 2023	Dec. 31, 2022
EGRP
Variable Interest Entity [Line Items]
Equity ownership	51%	51%
Antelope Valley
Variable Interest Entity [Line Items]
Equity ownership	100%	100%
NER
Variable Interest Entity [Line Items]
Equity ownership	100%	100%
Solar project entities
Variable Interest Entity [Line Items]
Equity ownership	100%
Wind project entities
Variable Interest Entity [Line Items]
Equity ownership	100%

Variable Interest Entities - Su

Variable Interest Entities - Summary of Significant Unconsolidated VIEs (Details) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total assets	[1]	$ 46,158	$ 46,909
Total liabilities	[1]	35,072	35,537
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total assets		713	715
Total liabilities		63	54
Our ownership interest in VIE		0	0
Other ownership interests in VIE		650	661
Commercial Agreement VIEs | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total assets		713	715
Total liabilities		63	54
Our ownership interest in VIE		0	0
Other ownership interests in VIE		650	661
Equity Investment VIEs | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total assets		0	0
Total liabilities		0	0
Our ownership interest in VIE		0	0
Other ownership interests in VIE		$ 0	$ 0
[1]Our consolidated assets include $2,506 million and $2,641 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Our consolidated liabilities include $1,033 million and $1,041 million at March 31, 2023 and December 31, 2022, respectively, of certain VIEs for which the VIE creditors do not have recourse to us. See Note 14 — Variable Interest Entities for additional information.

Supplemental Financial Inform_3

Supplemental Financial Information - Summary of Taxes other than income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Supplemental Financial Information [Abstract]
Operating lease income	$ 4	$ 4
Variable lease income	58	56
Gross receipts	33	30
Property	56	70
Payroll	$ 34	$ 33

Supplemental Financial Inform_4

Supplemental Financial Information - Summary of Other Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Decommissioning-related activities:
Regulatory Agreement Units	$ 314	$ 174
Non-Regulatory Agreement Units	194	85
Regulatory Agreement Units	29	(537)
Non-Regulatory Agreement Units	18	(337)
Regulatory offset to NDT fund-related activities	(275)	291
Decommissioning-related activities	280	(324)
Investment Income	16	3
Non-service net periodic benefit credit	14	18
Net unrealized (losses) gains from equity investments	$ (5)	$ (20)

Supplemental Financial Inform_5

Supplemental Financial Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Depreciation, amortization and accretion
Property, plant, and equipment	$ 262	$ 270
Amortization of intangible assets, net	5	10
Nuclear fuel	186	181
ARO accretion	143	132
Total depreciation, amortization, and accretion	605	602
Other non-cash operating activities
Pension and non-pension postretirement benefit costs	12	7
Other decommissioning related-activity	(136)	6
Energy-related options	93	188
Long-term incentive plan	12	9
Amortization of operating ROU asset	8	17
Loss on sale of receivables	20	10
Fair value adjustments related to gas imbalances	31	26
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	237	1,605	$ 422	$ 504
Restricted cash and cash equivalents	99	91	106	72
Total cash, restricted cash, and cash equivalents	336	1,696	528	576
Constellation Energy Generation, LLC
Depreciation, amortization and accretion
Total depreciation, amortization, and accretion	605	602
Other non-cash operating activities
Pension and non-pension postretirement benefit costs	12	7
Other decommissioning related-activity	(136)	6
Energy-related options	93	188
Long-term incentive plan	0	0
Amortization of operating ROU asset	8	17
Loss on sale of receivables	20	10
Fair value adjustments related to gas imbalances	31	26
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	236	1,605	403	504
Restricted cash and cash equivalents	91	79	98	72
Total cash, restricted cash, and cash equivalents	327	1,684	$ 501	$ 576
Unamortized Energy Contracts
Depreciation, amortization and accretion
Amortization of energy contract assets and liabilities	$ 9	$ 9

Supplemental Financial Inform_6

Supplemental Financial Information - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Supplemental Balance Sheet Information [Line Items]
Compensation-related accruals	$ 274	$ 540
Taxes accrued	327	257
Constellation Energy Generation, LLC
Supplemental Balance Sheet Information [Line Items]
Compensation-related accruals	220	502
Taxes accrued	$ 325	$ 257

Related Party Transactions - Op

Related Party Transactions - Operating Revenues and Purchased Power and Fuel From Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Related Party Transaction [Line Items]
Total operating revenues from affiliates	$ 0	$ 160
ComEd
Related Party Transaction [Line Items]
Total operating revenues from affiliates		58
PECO
Related Party Transaction [Line Items]
Total operating revenues from affiliates		33
BGE
Related Party Transaction [Line Items]
Total operating revenues from affiliates		18
PHI
Related Party Transaction [Line Items]
Total operating revenues from affiliates		51
Pepco
Related Party Transaction [Line Items]
Total operating revenues from affiliates		39
DPL
Related Party Transaction [Line Items]
Total operating revenues from affiliates		10
ACE
Related Party Transaction [Line Items]
Total operating revenues from affiliates		$ 2

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	$ 0	$ 44
Other
Related Party Transaction [Line Items]
Operating and maintenance from affiliates		44
Capitalized service company costs		$ 15