Exelon (EXC) 10-Q 2 May 24 2024 Q1 Quarterly report Financial data

Cover Page

Cover Page	3 Months Ended
	Mar. 31, 2024 shares
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-16169
Entity Registrant Name	EXELON CORPORATION
Entity Tax Identification Number	23-2990190
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	10 South Dearborn Street
Entity Address, Address Line Two	P.O. Box 805379
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60680-5379
City Area Code	(800)
Local Phone Number	483-3220
Title of 12(b) Security	Common stock, without par value
Trading Symbol	EXC
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	1,000,025,124
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001109357
Amendment Flag	false
Commonwealth Edison Co
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-01839
Entity Registrant Name	COMMONWEALTH EDISON COMPANY
Entity Tax Identification Number	36-0938600
Entity Incorporation, State or Country Code	IL
Entity Address, Address Line One	10 South Dearborn Street
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60603-2300
City Area Code	(312)
Local Phone Number	394-4321
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	127,021,409
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000022606
Amendment Flag	false
PECO Energy Co
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	000-16844
Entity Registrant Name	PECO ENERGY COMPANY
Entity Tax Identification Number	23-0970240
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	P.O. Box 8699
Entity Address, Address Line Two	2301 Market Street
Entity Address, City or Town	Philadelphia
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19101-8699
City Area Code	(215)
Local Phone Number	841-4000
Title of 12(b) Security	Cumulative Preferred Security, Series D
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	170,478,507
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000078100
No Trading Symbol Flag	true
Amendment Flag	false
Baltimore Gas and Electric Company
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-01910
Entity Registrant Name	BALTIMORE GAS AND ELECTRIC COMPANY
Entity Tax Identification Number	52-0280210
Entity Incorporation, State or Country Code	MD
Entity Address, Address Line One	2 Center Plaza
Entity Address, Address Line Two	110 West Fayette Street
Entity Address, City or Town	Baltimore
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21201-3708
City Area Code	(410)
Local Phone Number	234-5000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	1,000
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000009466
Amendment Flag	false
Pepco Holdings LLC
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-31403
Entity Registrant Name	PEPCO HOLDINGS LLC
Entity Tax Identification Number	52-2297449
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	701 Ninth Street, N.W.
Entity Address, City or Town	Washington
Entity Address, State or Province	DC
Entity Address, Postal Zip Code	20068-0001
City Area Code	(202)
Local Phone Number	872-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001135971
Amendment Flag	false
Potomac Electric Power Company
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-01072
Entity Registrant Name	POTOMAC ELECTRIC POWER COMPANY
Entity Tax Identification Number	53-0127880
Entity Address, Address Line One	701 Ninth Street, N.W.
Entity Address, City or Town	Washington
Entity Address, State or Province	DC
Entity Address, Postal Zip Code	20068-0001
City Area Code	(202)
Local Phone Number	872-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	100
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000079732
Amendment Flag	false
Delmarva Power and Light Company
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-01405
Entity Registrant Name	DELMARVA POWER & LIGHT COMPANY
Entity Tax Identification Number	51-0084283
Entity Address, Address Line One	500 North Wakefield Drive
Entity Address, City or Town	Newark
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19702-5440
City Area Code	(202)
Local Phone Number	872-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	1,000
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000027879
Amendment Flag	false
Atlantic City Electric Company
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-03559
Entity Registrant Name	ATLANTIC CITY ELECTRIC COMPANY
Entity Tax Identification Number	21-0398280
Entity Incorporation, State or Country Code	NJ
Entity Address, Address Line One	500 North Wakefield Drive
Entity Address, City or Town	Newark
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19702-5440
City Area Code	(202)
Local Phone Number	872-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding	8,546,017
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000008192
Amendment Flag	false
DISTRICT OF COLUMBIA | Potomac Electric Power Company
Document Information [Line Items]
Entity Incorporation, State or Country Code	DC
VIRGINIA | Potomac Electric Power Company
Document Information [Line Items]
Entity Incorporation, State or Country Code	VA
VIRGINIA | Delmarva Power and Light Company
Document Information [Line Items]
Entity Incorporation, State or Country Code	VA
DELAWARE | Delmarva Power and Light Company
Document Information [Line Items]
Entity Incorporation, State or Country Code	DE

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - Exelon - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Revenues from alternative revenue programs		$ 106	$ 279
Total operating revenues		6,043	5,563
Operating expenses
Operating and maintenance		1,271	1,151
Depreciation and amortization		879	860
Taxes other than income taxes		371	355
Total operating expenses		4,931	4,457
Gain on sales of assets		2	0
Operating income		1,114	1,106
Other income and (deductions)
Interest expense, net		(462)	(406)
Other, net		75	109
Total other income and (deductions)		(393)	(303)
Income (Loss) before income taxes		721	803
Income taxes		63	134
Net income attributable to common shareholders		658	669
Net income		658	669
Other comprehensive income (loss), net of income taxes
Actuarial losses reclassified to periodic benefit cost		5	3
Pension and non-pension postretirement benefit plans valuation adjustments		(24)	(10)
Unrealized gains on cash flow hedges		33	6
Other comprehensive income (loss)		14	(1)
Comprehensive income		$ 672	$ 668
Average shares of common stock outstanding:
Basic average shares of common stock outstanding (in shares)		1,000	995
Assumed exercise and/or distributions of stock-based awards (in shares)	[1]	1	1
Diluted average shares of common stock outstanding (in shares)		1,001	996
Earnings Per Share [Abstract]
Basic earnings per average common share		$ 0.66	$ 0.67
Diluted earnings per average common share		$ 0.66	$ 0.67
PECO Energy Co
Operating revenues
Revenues from alternative revenue programs		$ (2)	$ (4)
Total operating revenues		1,054	1,112
Operating expenses
Operating and maintenance		235	219
Depreciation and amortization		104	98
Taxes other than income taxes		51	50
Total operating expenses		851	902
Gain on sales of assets		2	0
Operating income		205	210
Other income and (deductions)
Interest expense, net		(52)	(45)
Other, net		9	8
Total other income and (deductions)		(46)	(40)
Income (Loss) before income taxes		159	170
Income taxes		10	4
Net income		149	166
Related Party
Other income and (deductions)
Interest expense to affiliates		(6)	(6)
Related Party | PECO Energy Co
Operating expenses
Operating and maintenance from affiliates		58	51
Other income and (deductions)
Interest expense to affiliates		(3)	(3)
Electricity, US Regulated
Operating revenues
Electric operating revenues		5,198	4,462
Operating expenses
Purchased power and/or fuel		2,197	1,733
Electricity, US Regulated | PECO Energy Co
Operating revenues
Electric operating revenues		782	798
Operating expenses
Purchased power and/or fuel		306	330
Natural Gas, US Regulated
Operating revenues
Electric operating revenues		739	822
Operating expenses
Purchased power and/or fuel		213	358
Natural Gas, US Regulated | PECO Energy Co
Operating revenues
Electric operating revenues		272	316
Operating expenses
Purchased power and/or fuel		$ 97	$ 154
[1] The dilutive effects of stock-based compensation awards are calculated using the treasury stock method for all periods presented.

Consolidated Statements of Op_2

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - ComEd - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Revenues from alternative revenue programs	$ 106	$ 279
Total operating revenues	6,043	5,563
Operating expenses
Operating and maintenance	1,271	1,151
Depreciation and amortization	879	860
Taxes other than income taxes	371	355
Total operating expenses	4,931	4,457
Gain on sales of assets	2	0
Operating income	1,114	1,106
Other income and (deductions)
Interest expense, net	(462)	(406)
Other, net	75	109
Total other income and (deductions)	(393)	(303)
Income before income taxes	721	803
Income taxes	63	134
Net income	658	669
Related Party
Other income and (deductions)
Interest expense to affiliates	(6)	(6)
Commonwealth Edison Co
Operating revenues
Revenues from alternative revenue programs	19	153
Total operating revenues	2,095	1,667
Operating expenses
Operating and maintenance	318	254
Depreciation and amortization	362	338
Taxes other than income taxes	94	93
Total operating expenses	1,781	1,256
Operating income	314	411
Other income and (deductions)
Interest expense, net	(119)	(114)
Other, net	20	18
Total other income and (deductions)	(102)	(99)
Income before income taxes	212	312
Income taxes	19	71
Net income	193	241
Comprehensive income	193	241
Commonwealth Edison Co | Related Party
Operating revenues
Operating revenues from affiliates	2	3
Operating expenses
Operating and maintenance from affiliates	100	83
Other income and (deductions)
Interest expense to affiliates	(3)	(3)
Electricity, US Regulated
Operating revenues
Electric operating revenues	5,198	4,462
Operating expenses
Purchased power and/or fuel	2,197	1,733
Electricity, US Regulated | Commonwealth Edison Co
Operating revenues
Electric operating revenues	2,074	1,511
Operating expenses
Purchased power and/or fuel	907	488
Natural Gas, US Regulated
Operating revenues
Electric operating revenues	739	822
Operating expenses
Purchased power and/or fuel	$ 213	$ 358

Consolidated Statements of Op_3

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - PECO - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Revenues from alternative revenue programs	$ 106	$ 279
Total operating revenues	6,043	5,563
Operating expenses
Operating and maintenance	1,271	1,151
Depreciation and amortization	879	860
Taxes other than income taxes	371	355
Total operating expenses	4,931	4,457
Gain on sales of assets	2	0
Operating income	1,114	1,106
Other income and (deductions)
Interest expense, net	(462)	(406)
Other, net	75	109
Total other income and (deductions)	(393)	(303)
Income before income taxes	721	803
Income taxes	63	134
Net income	658	669
Related Party
Other income and (deductions)
Interest expense to affiliates	(6)	(6)
PECO Energy Co
Operating revenues
Revenues from alternative revenue programs	(2)	(4)
Total operating revenues	1,054	1,112
Operating expenses
Operating and maintenance	235	219
Depreciation and amortization	104	98
Taxes other than income taxes	51	50
Total operating expenses	851	902
Gain on sales of assets	2	0
Operating income	205	210
Other income and (deductions)
Interest expense, net	(52)	(45)
Other, net	9	8
Total other income and (deductions)	(46)	(40)
Income before income taxes	159	170
Income taxes	10	4
Net income	149	166
Comprehensive income	149	166
PECO Energy Co | Related Party
Operating revenues
Operating revenues from affiliates	2	2
Operating expenses
Operating and maintenance from affiliates	58	51
Other income and (deductions)
Interest expense to affiliates	(3)	(3)
Electricity, US Regulated
Operating revenues
Electric operating revenues	5,198	4,462
Operating expenses
Purchased power and/or fuel	2,197	1,733
Electricity, US Regulated | PECO Energy Co
Operating revenues
Electric operating revenues	782	798
Operating expenses
Purchased power and/or fuel	306	330
Natural Gas, US Regulated
Operating revenues
Electric operating revenues	739	822
Operating expenses
Purchased power and/or fuel	213	358
Natural Gas, US Regulated | PECO Energy Co
Operating revenues
Electric operating revenues	272	316
Operating expenses
Purchased power and/or fuel	$ 97	$ 154

Statements of Operations and Co

Statements of Operations and Comprehensive Income (Unaudited) - BGE - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Revenues from alternative revenue programs	$ 106	$ 279
Total operating revenues	6,043	5,563
Operating expenses
Operating and maintenance	1,271	1,151
Depreciation and amortization	879	860
Taxes other than income taxes	371	355
Total operating expenses	4,931	4,457
Operating income	1,114	1,106
Other income and (deductions)
Interest expense, net	(462)	(406)
Other, net	75	109
Total other income and (deductions)	(393)	(303)
Income before income taxes	721	803
Income taxes	63	134
Net income	658	669
Baltimore Gas and Electric Company
Operating revenues
Revenues from alternative revenue programs	43	65
Total operating revenues	1,297	1,257
Operating expenses
Operating and maintenance	205	168
Depreciation and amortization	150	167
Taxes other than income taxes	89	83
Total operating expenses	967	964
Operating income	330	293
Other income and (deductions)
Interest expense, net	(50)	(44)
Other, net	8	3
Total other income and (deductions)	(42)	(41)
Income before income taxes	288	252
Income taxes	24	52
Net income	264	200
Comprehensive income	264	200
Baltimore Gas and Electric Company | Related Party
Operating revenues
Operating revenues from affiliates	2	3
Operating expenses
Operating and maintenance from affiliates	59	54
Electricity, US Regulated
Operating revenues
Electric operating revenues	5,198	4,462
Operating expenses
Purchased power and/or fuel	2,197	1,733
Electricity, US Regulated | Baltimore Gas and Electric Company
Operating revenues
Electric operating revenues	857	780
Operating expenses
Purchased power and/or fuel	377	343
Natural Gas, US Regulated
Operating revenues
Electric operating revenues	739	822
Operating expenses
Purchased power and/or fuel	213	358
Natural Gas, US Regulated | Baltimore Gas and Electric Company
Operating revenues
Electric operating revenues	395	409
Operating expenses
Purchased power and/or fuel	$ 87	$ 149

Consolidated Statements of Op_4

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - PHI - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Revenues from alternative revenue programs	$ 106	$ 279
Total operating revenues	6,043	5,563
Operating expenses
Operating and maintenance	1,271	1,151
Depreciation and amortization	879	860
Taxes other than income taxes	371	355
Total operating expenses	4,931	4,457
Operating income	1,114	1,106
Other income and (deductions)
Interest expense, net	(462)	(406)
Other, net	75	109
Total other income and (deductions)	(393)	(303)
Income before income taxes	721	803
Income taxes	63	134
Net income	658	669
Comprehensive income	672	668
Pepco Holdings LLC
Operating revenues
Revenues from alternative revenue programs	46	65
Total operating revenues	1,606	1,536
Operating expenses
Operating and maintenance	274	267
Depreciation and amortization	246	241
Taxes other than income taxes	128	120
Total operating expenses	1,335	1,297
Operating income	271	239
Other income and (deductions)
Interest expense, net	(90)	(76)
Other, net	27	26
Total other income and (deductions)	(63)	(50)
Income before income taxes	208	189
Income taxes	40	34
Net income	168	155
Comprehensive income	168	155
Pepco Holdings LLC | Related Party
Operating revenues
Operating revenues from affiliates	3	3
Operating expenses
Operating and maintenance from affiliates	51	42
Electricity, US Regulated
Operating revenues
Electric operating revenues	5,198	4,462
Operating expenses
Purchased power and/or fuel	2,197	1,733
Electricity, US Regulated | Pepco Holdings LLC
Operating revenues
Electric operating revenues	1,485	1,371
Operating expenses
Purchased power and/or fuel	607	572
Natural Gas, US Regulated
Operating revenues
Electric operating revenues	739	822
Operating expenses
Purchased power and/or fuel	213	358
Natural Gas, US Regulated | Pepco Holdings LLC
Operating revenues
Electric operating revenues	72	97
Operating expenses
Purchased power and/or fuel	$ 29	$ 55

Statements of Operations and _2

Statements of Operations and Comprehensive Income (Unaudited) - Pepco - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Revenues from alternative revenue programs	$ 106	$ 279
Total operating revenues	6,043	5,563
Operating expenses
Operating and maintenance	1,271	1,151
Depreciation and amortization	879	860
Taxes other than income taxes	371	355
Total operating expenses	4,931	4,457
Gain on sales of assets	2	0
Operating income	1,114	1,106
Other income and (deductions)
Interest expense, net	(462)	(406)
Other, net	75	109
Total other income and (deductions)	(393)	(303)
Income before income taxes	721	803
Income taxes	63	134
Net income	658	669
Related Party
Other income and (deductions)
Interest expense to affiliates	(6)	(6)
Potomac Electric Power Company
Operating revenues
Revenues from alternative revenue programs	29	39
Total operating revenues	759	710
Operating expenses
Operating and maintenance	86	93
Depreciation and amortization	107	108
Taxes other than income taxes	102	94
Total operating expenses	640	610
Operating income	119	100
Other income and (deductions)
Interest expense, net	(45)	(39)
Other, net	15	16
Total other income and (deductions)	(30)	(23)
Income before income taxes	89	77
Income taxes	14	12
Net income	75	65
Comprehensive income	75	65
Potomac Electric Power Company | Related Party
Operating revenues
Operating revenues from affiliates	2	1
Operating expenses
Operating and maintenance from affiliates	64	57
Electricity, US Regulated
Operating revenues
Electric operating revenues	5,198	4,462
Operating expenses
Purchased power and/or fuel	2,197	1,733
Electricity, US Regulated | Potomac Electric Power Company
Operating revenues
Electric operating revenues	728	670
Operating expenses
Purchased power and/or fuel	281	258
Natural Gas, US Regulated
Operating revenues
Electric operating revenues	739	822
Operating expenses
Purchased power and/or fuel	$ 213	$ 358

Statements of Operations and _3

Statements of Operations and Comprehensive Income (Unaudited) - DPL - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Revenues from alternative revenue programs	$ 106	$ 279
Total operating revenues	6,043	5,563
Operating expenses
Operating and maintenance	1,271	1,151
Depreciation and amortization	879	860
Taxes other than income taxes	371	355
Total operating expenses	4,931	4,457
Operating income	1,114	1,106
Other income and (deductions)
Interest expense, net	(462)	(406)
Other, net	75	109
Total other income and (deductions)	(393)	(303)
Income before income taxes	721	803
Income taxes	63	134
Net income	658	669
Delmarva Power and Light Company
Operating revenues
Revenues from alternative revenue programs	4	9
Total operating revenues	491	474
Operating expenses
Operating and maintenance	51	46
Depreciation and amortization	61	60
Taxes other than income taxes	20	20
Total operating expenses	391	388
Operating income	100	86
Other income and (deductions)
Interest expense, net	(22)	(17)
Other, net	5	3
Total other income and (deductions)	(17)	(14)
Income before income taxes	83	72
Income taxes	17	12
Net income	66	60
Comprehensive income	66	60
Delmarva Power and Light Company | Related Party
Operating revenues
Operating revenues from affiliates	2	2
Operating expenses
Operating and maintenance from affiliates	44	41
Electricity, US Regulated
Operating revenues
Electric operating revenues	5,198	4,462
Operating expenses
Purchased power and/or fuel	2,197	1,733
Electricity, US Regulated | Delmarva Power and Light Company
Operating revenues
Electric operating revenues	413	366
Operating expenses
Purchased power and/or fuel	186	166
Natural Gas, US Regulated
Operating revenues
Electric operating revenues	739	822
Operating expenses
Purchased power and/or fuel	213	358
Natural Gas, US Regulated | Delmarva Power and Light Company
Operating revenues
Electric operating revenues	72	97
Operating expenses
Purchased power and/or fuel	$ 29	$ 55

Consolidated Statements of Op_5

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - ACE - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating revenues
Revenues from alternative revenue programs	$ 106	$ 279
Total operating revenues	6,043	5,563
Operating expenses
Operating and maintenance	1,271	1,151
Depreciation and amortization	879	860
Taxes other than income taxes	371	355
Total operating expenses	4,931	4,457
Gain on sales of assets	2	0
Operating income	1,114	1,106
Other income and (deductions)
Interest expense, net	(462)	(406)
Other, net	75	109
Total other income and (deductions)	(393)	(303)
Income before income taxes	721	803
Income taxes	63	134
Net income	658	669
Related Party
Other income and (deductions)
Interest expense to affiliates	(6)	(6)
Atlantic City Electric Company
Operating revenues
Revenues from alternative revenue programs	13	17
Total operating revenues	358	353
Operating expenses
Operating and maintenance	47	44
Depreciation and amortization	74	67
Taxes other than income taxes	2	2
Total operating expenses	303	298
Operating income	55	55
Other income and (deductions)
Interest expense, net	(20)	(16)
Other, net	5	5
Total other income and (deductions)	(15)	(11)
Income before income taxes	40	44
Income taxes	11	11
Net income	29	33
Comprehensive income	29	33
Atlantic City Electric Company | Related Party
Operating revenues
Operating revenues from affiliates	1	1
Operating expenses
Operating and maintenance from affiliates	40	37
Electricity, US Regulated
Operating revenues
Electric operating revenues	5,198	4,462
Operating expenses
Purchased power and/or fuel	2,197	1,733
Electricity, US Regulated | Atlantic City Electric Company
Operating revenues
Electric operating revenues	344	335
Operating expenses
Purchased power and/or fuel	140	148
Natural Gas, US Regulated
Operating revenues
Electric operating revenues	739	822
Operating expenses
Purchased power and/or fuel	$ 213	$ 358

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - Exelon - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 658	$ 669
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	880	860
Gain on sales of assets and businesses	(2)	0
Deferred income taxes and amortization of investment tax credits	46	113
Net fair value changes related to derivatives	1	0
Other non-cash operating activities	39	(138)
Changes in assets and liabilities:
Accounts receivable	(309)	106
Inventories	12	102
Accounts payable and accrued expenses	(238)	(482)
Collateral paid, net	7	(214)
Income taxes	21	23
Regulatory assets and liabilities, net	252	(324)
Pension and non-pension postretirement benefit contributions	(111)	(44)
Other assets and liabilities	(264)	(187)
Net cash flows provided by operating activities	992	484
Cash flows from investing activities
Capital expenditures	(1,767)	(1,881)
Proceeds from Sale of Property Held-for-sale	2	0
Other investing activities	(2)	10
Net cash flows used in investing activities	(1,767)	(1,871)
Cash flows from financing activities
Changes in short-term borrowings	(317)	(1,130)
Proceeds from short-term borrowings with maturities greater than 90 days	150	0
Repayments on short-term borrowings with maturities greater than 90 days	(150)	(150)
Issuance of long-term debt	2,625	3,925
Retirement of long-term debt	(901)	(857)
Dividends paid on common stock	(381)	(358)
Proceeds from employee stock plans	11	10
Other financing activities	(55)	(60)
Net cash flows provided by financing activities	982	1,380
Increase (decrease) in cash, restricted cash, and cash equivalents	207	(7)
Cash, restricted cash, and cash equivalents at beginning of period	1,101	1,090
Cash, restricted cash, and cash equivalents at end of period	1,308	1,083
Supplemental cash flow information
Decrease in capital expenditures not paid	$ (117)	$ (201)

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Unaudited) - ComEd - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 658	$ 669
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	880	860
Gain on sales of assets and businesses	(2)	0
Deferred income taxes and amortization of investment tax credits	46	113
Net fair value changes related to derivatives	1	0
Other non-cash operating activities	39	(138)
Changes in assets and liabilities:
Accounts receivable	(309)	106
Inventories	12	102
Accounts payable and accrued expenses	(238)	(482)
Collateral paid, net	7	(214)
Income taxes	21	23
Regulatory assets and liabilities, net	252	(324)
Pension and non-pension postretirement benefit contributions	(111)	(44)
Other assets and liabilities	(264)	(187)
Net cash flows provided by operating activities	992	484
Cash flows from investing activities
Capital expenditures	(1,767)	(1,881)
Other investing activities	(2)	10
Net cash flows used in investing activities	(1,767)	(1,871)
Cash flows from financing activities
Changes in short-term borrowings	(317)	(1,130)
Proceeds from short-term borrowings with maturities greater than 90 days	150	0
Repayments on short-term borrowings with maturities greater than 90 days	(150)	(150)
Issuance of long-term debt	2,625	3,925
Retirement of long-term debt	(901)	(857)
Dividends paid on common stock	(381)	(358)
Other financing activities	(55)	(60)
Net cash flows provided by financing activities	982	1,380
Increase in cash, restricted cash, and cash equivalents	207	(7)
Cash, restricted cash, and cash equivalents at beginning of period	1,101	1,090
Cash, restricted cash, and cash equivalents at end of period	1,308	1,083
Supplemental cash flow information
Decrease in capital expenditures not paid	(117)	(201)
Commonwealth Edison Co
Cash flows from operating activities
Net income	193	241
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	362	338
Deferred income taxes and amortization of investment tax credits	(1)	55
Other non-cash operating activities	(6)	(153)
Changes in assets and liabilities:
Accounts receivable	(133)	96
Receivables from and payables to affiliates, net	0	10
Inventories	(11)	(21)
Accounts payable and accrued expenses	(116)	(306)
Collateral paid, net	8	(4)
Income taxes	21	15
Regulatory assets and liabilities, net	315	(338)
Pension and non-pension postretirement benefit contributions	(5)	(23)
Other assets and liabilities	(67)	(22)
Net cash flows provided by operating activities	560	(112)
Cash flows from investing activities
Capital expenditures	(594)	(617)
Other investing activities	1	1
Net cash flows used in investing activities	(593)	(616)
Cash flows from financing activities
Changes in short-term borrowings	128	(18)
Repayments on short-term borrowings with maturities greater than 90 days	0	(150)
Issuance of long-term debt	0	975
Dividends paid on common stock	(194)	(187)
Contributions from parent	39	186
Other financing activities	1	(11)
Net cash flows provided by financing activities	(26)	795
Increase in cash, restricted cash, and cash equivalents	(59)	67
Cash, restricted cash, and cash equivalents at beginning of period	686	511
Cash, restricted cash, and cash equivalents at end of period	627	578
Supplemental cash flow information
Decrease in capital expenditures not paid	$ (74)	$ (35)

Consolidated Statements of Ca_3

Consolidated Statements of Cash Flows (Unaudited) - PECO - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 658	$ 669
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	880	860
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(2)	0
Deferred income taxes and amortization of investment tax credits	46	113
Other non-cash operating activities	39	(138)
Changes in assets and liabilities:
Accounts receivable	(309)	106
Inventories	12	102
Accounts payable and accrued expenses	(238)	(482)
Income taxes	21	23
Regulatory assets and liabilities, net	252	(324)
Pension and non-pension postretirement benefit contributions	(111)	(44)
Other assets and liabilities	(264)	(187)
Net cash flows provided by operating activities	992	484
Cash flows from investing activities
Capital expenditures	(1,767)	(1,881)
Other investing activities	(2)	10
Net cash flows used in investing activities	(1,767)	(1,871)
Cash flows from financing activities
Changes in short-term borrowings	(317)	(1,130)
Issuance of long-term debt	2,625	3,925
Retirement of long-term debt	(901)	(857)
Dividends paid on common stock	(381)	(358)
Other financing activities	(55)	(60)
Net cash flows provided by financing activities	982	1,380
Increase in cash, restricted cash, and cash equivalents	207	(7)
Cash, restricted cash, and cash equivalents at beginning of period	1,101	1,090
Cash, restricted cash, and cash equivalents at end of period	1,308	1,083
Supplemental cash flow information
Decrease in capital expenditures not paid	(117)	(201)
PECO Energy Co
Cash flows from operating activities
Net income	149	166
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	104	98
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(2)	0
Deferred income taxes and amortization of investment tax credits	(8)	(16)
Other non-cash operating activities	20	32
Changes in assets and liabilities:
Accounts receivable	(75)	36
Receivables from and payables to affiliates, net	4	8
Inventories	19	60
Accounts payable and accrued expenses	(63)	(176)
Income taxes	19	20
Regulatory assets and liabilities, net	(20)	15
Pension and non-pension postretirement benefit contributions	(2)	0
Other assets and liabilities	(104)	(75)
Net cash flows provided by operating activities	41	168
Cash flows from investing activities
Capital expenditures	(361)	(335)
Other investing activities	2	0
Net cash flows used in investing activities	(359)	(335)
Cash flows from financing activities
Changes in short-term borrowings	(165)	(94)
Dividends paid on common stock	(100)	(101)
Contributions from parent	580	330
Net cash flows provided by financing activities	315	135
Increase in cash, restricted cash, and cash equivalents	(3)	(32)
Cash, restricted cash, and cash equivalents at beginning of period	51	68
Cash, restricted cash, and cash equivalents at end of period	48	36
Supplemental cash flow information
Decrease in capital expenditures not paid	$ 5	$ (9)

Statements of Cash Flows (Unaud

Statements of Cash Flows (Unaudited) - BGE - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 658	$ 669
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	880	860
Deferred income taxes and amortization of investment tax credits	46	113
Other non-cash operating activities	39	(138)
Changes in assets and liabilities:
Accounts receivable	(309)	106
Inventories	12	102
Accounts payable and accrued expenses	(238)	(482)
Collateral paid, net	7	(214)
Income taxes	21	23
Regulatory assets and liabilities, net	252	(324)
Pension and non-pension postretirement benefit contributions	(111)	(44)
Other assets and liabilities	(264)	(187)
Net cash flows provided by operating activities	992	484
Cash flows from investing activities
Capital expenditures	(1,767)	(1,881)
Proceeds from Sale of Property Held-for-sale	2	0
Other investing activities	(2)	10
Net cash flows used in investing activities	(1,767)	(1,871)
Cash flows from financing activities
Changes in short-term borrowings	(317)	(1,130)
Proceeds from short-term borrowings with maturities greater than 90 days	150	0
Repayments on short-term borrowings with maturities greater than 90 days	(150)	(150)
Issuance of long-term debt	2,625	3,925
Retirement of long-term debt	(901)	(857)
Dividends paid on common stock	(381)	(358)
Proceeds from employee stock plans	11	10
Other financing activities	(55)	(60)
Net cash flows provided by financing activities	982	1,380
Increase in cash, restricted cash, and cash equivalents	207	(7)
Cash, restricted cash, and cash equivalents at beginning of period	1,101	1,090
Cash, restricted cash, and cash equivalents at end of period	1,308	1,083
Supplemental cash flow information
Decrease in capital expenditures not paid	(117)	(201)
Baltimore Gas and Electric Company
Cash flows from operating activities
Net income	264	200
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	150	167
Deferred income taxes and amortization of investment tax credits	(4)	24
Other non-cash operating activities	(21)	(32)
Changes in assets and liabilities:
Accounts receivable	(95)	43
Receivables from and payables to affiliates, net	2	(3)
Inventories	14	62
Accounts payable and accrued expenses	21	(96)
Collateral paid, net	0	(22)
Income taxes	29	29
Regulatory assets and liabilities, net	0	(31)
Pension and non-pension postretirement benefit contributions	(25)	(8)
Other assets and liabilities	(18)	(24)
Net cash flows provided by operating activities	317	309
Cash flows from investing activities
Capital expenditures	(324)	(350)
Other investing activities	8	3
Net cash flows used in investing activities	(316)	(347)
Cash flows from financing activities
Changes in short-term borrowings	70	(165)
Dividends paid on common stock	(92)	(80)
Contributions from parent	0	237
Net cash flows provided by financing activities	(22)	(8)
Increase in cash, restricted cash, and cash equivalents	(21)	(46)
Cash, restricted cash, and cash equivalents at beginning of period	48	67
Cash, restricted cash, and cash equivalents at end of period	27	21
Supplemental cash flow information
Decrease in capital expenditures not paid	$ (8)	$ (70)

Consolidated Statements of Ca_4

Consolidated Statements of Cash Flows (Unaudited) - PHI - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 658	$ 669
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	880	860
Deferred income taxes and amortization of investment tax credits	46	113
Other non-cash operating activities	39	(138)
Changes in assets and liabilities:
Accounts receivable	(309)	106
Inventories	12	102
Accounts payable and accrued expenses	(238)	(482)
Collateral paid, net	7	(214)
Income taxes	21	23
Regulatory assets and liabilities, net	252	(324)
Pension and non-pension postretirement benefit contributions	(111)	(44)
Other assets and liabilities	(264)	(187)
Net cash flows provided by operating activities	992	484
Cash flows from investing activities
Capital expenditures	(1,767)	(1,881)
Other investing activities	(2)	10
Net cash flows used in investing activities	(1,767)	(1,871)
Cash flows from financing activities
Changes in short-term borrowings	(317)	(1,130)
Issuance of long-term debt	2,625	3,925
Retirement of long-term debt	(901)	(857)
Other financing activities	(55)	(60)
Net cash flows provided by financing activities	982	1,380
Increase in cash, restricted cash, and cash equivalents	207	(7)
Cash, restricted cash, and cash equivalents at beginning of period	1,101	1,090
Cash, restricted cash, and cash equivalents at end of period	1,308	1,083
Supplemental cash flow information
Decrease in capital expenditures not paid	(117)	(201)
Pepco Holdings LLC
Cash flows from operating activities
Net income	168	155
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization	246	241
Deferred income taxes and amortization of investment tax credits	16	13
Other non-cash operating activities	9	(7)
Changes in assets and liabilities:
Accounts receivable	1	98
Inventories	(11)	4
Accounts payable and accrued expenses	(23)	(88)
Collateral paid, net	0	(189)
Income taxes	24	20
Regulatory assets and liabilities, net	(42)	27
Pension and non-pension postretirement benefit contributions	(72)	(7)
Other assets and liabilities	(27)	(11)
Net cash flows provided by operating activities	289	256
Cash flows from investing activities
Capital expenditures	(453)	(561)
Other investing activities	0	8
Net cash flows used in investing activities	(453)	(553)
Cash flows from financing activities
Changes in short-term borrowings	(394)	(414)
Issuance of long-term debt	925	450
Retirement of long-term debt	(400)	0
Changes in Exelon intercompany money pool	8	8
Distributions to member	(118)	(112)
Contributions from member	487	405
Other financing activities	(21)	(17)
Net cash flows provided by financing activities	487	320
Increase in cash, restricted cash, and cash equivalents	323	23
Cash, restricted cash, and cash equivalents at beginning of period	204	373
Cash, restricted cash, and cash equivalents at end of period	527	396
Supplemental cash flow information
Decrease in capital expenditures not paid	$ (11)	$ (76)

Statements of Cash Flows (Una_2

Statements of Cash Flows (Unaudited) - Pepco - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 658	$ 669
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	880	860
Deferred income taxes and amortization of investment tax credits	46	113
Other non-cash operating activities	39	(138)
Changes in assets and liabilities:
Accounts receivable	(309)	106
Inventories	12	102
Accounts payable and accrued expenses	(238)	(482)
Collateral paid, net	7	(214)
Income taxes	21	23
Regulatory assets and liabilities, net	252	(324)
Pension and non-pension postretirement benefit contributions	(111)	(44)
Other assets and liabilities	(264)	(187)
Net cash flows provided by operating activities	992	484
Cash flows from investing activities
Capital expenditures	(1,767)	(1,881)
Other investing activities	(2)	10
Net cash flows used in investing activities	(1,767)	(1,871)
Cash flows from financing activities
Changes in short-term borrowings	(317)	(1,130)
Issuance of long-term debt	2,625	3,925
Retirement of long-term debt	(901)	(857)
Dividends paid on common stock	(381)	(358)
Other financing activities	(55)	(60)
Net cash flows provided by financing activities	982	1,380
Increase in cash, restricted cash, and cash equivalents	207	(7)
Cash, restricted cash, and cash equivalents at beginning of period	1,101	1,090
Cash, restricted cash, and cash equivalents at end of period	1,308	1,083
Supplemental cash flow information
Decrease in capital expenditures not paid	(117)	(201)
Potomac Electric Power Company
Cash flows from operating activities
Net income	75	65
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	107	108
Deferred income taxes and amortization of investment tax credits	3	3
Other non-cash operating activities	(13)	(10)
Changes in assets and liabilities:
Accounts receivable	21	52
Receivables from and payables to affiliates, net	6	3
Inventories	(10)	(3)
Accounts payable and accrued expenses	0	(27)
Collateral paid, net	(1)	(25)
Income taxes	12	8
Regulatory assets and liabilities, net	6	(3)
Pension and non-pension postretirement benefit contributions	(4)	(4)
Other assets and liabilities	(19)	11
Net cash flows provided by operating activities	183	178
Cash flows from investing activities
Capital expenditures	(229)	(264)
Changes in PHI intercompany money pool	(134)	0
Other investing activities	0	8
Net cash flows used in investing activities	(363)	(256)
Cash flows from financing activities
Changes in short-term borrowings	(132)	(299)
Issuance of long-term debt	675	250
Retirement of long-term debt	(400)	0
Dividends paid on common stock	(51)	(48)
Contributions from parent	251	243
Other financing activities	(15)	(14)
Net cash flows provided by financing activities	328	132
Increase in cash, restricted cash, and cash equivalents	148	54
Cash, restricted cash, and cash equivalents at beginning of period	72	99
Cash, restricted cash, and cash equivalents at end of period	220	153
Supplemental cash flow information
Decrease in capital expenditures not paid	$ (11)	$ (43)

Statements of Cash Flows (Una_3

Statements of Cash Flows (Unaudited) - DPL - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 658	$ 669
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	880	860
Deferred income taxes and amortization of investment tax credits	46	113
Other non-cash operating activities	39	(138)
Changes in assets and liabilities:
Accounts receivable	(309)	106
Inventories	12	102
Accounts payable and accrued expenses	(238)	(482)
Collateral paid, net	7	(214)
Income taxes	21	23
Regulatory assets and liabilities, net	252	(324)
Other assets and liabilities	(264)	(187)
Net cash flows provided by operating activities	992	484
Cash flows from investing activities
Capital expenditures	(1,767)	(1,881)
Other investing activities	(2)	10
Net cash flows used in investing activities	(1,767)	(1,871)
Cash flows from financing activities
Changes in short-term borrowings	(317)	(1,130)
Issuance of long-term debt	2,625	3,925
Dividends paid on common stock	(381)	(358)
Other financing activities	(55)	(60)
Net cash flows provided by financing activities	982	1,380
Increase in cash, restricted cash, and cash equivalents	207	(7)
Cash, restricted cash, and cash equivalents at beginning of period	1,101	1,090
Cash, restricted cash, and cash equivalents at end of period	1,308	1,083
Supplemental cash flow information
Decrease in capital expenditures not paid	(117)	(201)
Delmarva Power and Light Company
Cash flows from operating activities
Net income	66	60
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	61	60
Deferred income taxes and amortization of investment tax credits	6	3
Other non-cash operating activities	12	(1)
Changes in assets and liabilities:
Accounts receivable	(7)	23
Receivables from and payables to affiliates, net	0	4
Inventories	1	10
Accounts payable and accrued expenses	16	(16)
Collateral paid, net	0	(120)
Income taxes	10	9
Regulatory assets and liabilities, net	(1)	27
Other assets and liabilities	6	1
Net cash flows provided by operating activities	170	60
Cash flows from investing activities
Capital expenditures	(134)	(134)
Net cash flows used in investing activities	(134)	(134)
Cash flows from financing activities
Changes in short-term borrowings	(63)	(115)
Issuance of long-term debt	175	125
Dividends paid on common stock	(45)	(42)
Contributions from parent	154	99
Other financing activities	(3)	(2)
Net cash flows provided by financing activities	218	65
Increase in cash, restricted cash, and cash equivalents	254	(9)
Cash, restricted cash, and cash equivalents at beginning of period	16	152
Cash, restricted cash, and cash equivalents at end of period	270	143
Supplemental cash flow information
Decrease in capital expenditures not paid	$ (6)	$ (3)

Consolidated Statements of Ca_5

Consolidated Statements of Cash Flows (Unaudited) - ACE - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income	$ 658	$ 669
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	880	860
Deferred income taxes and amortization of investment tax credits	46	113
Other non-cash operating activities	39	(138)
Changes in assets and liabilities:
Accounts receivable	(309)	106
Inventories	12	102
Accounts payable and accrued expenses	(238)	(482)
Collateral paid, net	7	(214)
Income taxes	21	23
Regulatory assets and liabilities, net	252	(324)
Pension and non-pension postretirement benefit contributions	(111)	(44)
Other assets and liabilities	(264)	(187)
Net cash flows provided by operating activities	992	484
Cash flows from investing activities
Capital expenditures	(1,767)	(1,881)
Other investing activities	(2)	10
Net cash flows used in investing activities	(1,767)	(1,871)
Cash flows from financing activities
Changes in short-term borrowings	(317)	(1,130)
Issuance of long-term debt	2,625	3,925
Dividends paid on common stock	(381)	(358)
Other financing activities	(55)	(60)
Net cash flows provided by financing activities	982	1,380
Increase in cash, restricted cash, and cash equivalents	207	(7)
Cash, restricted cash, and cash equivalents at beginning of period	1,101	1,090
Cash, restricted cash, and cash equivalents at end of period	1,308	1,083
Supplemental cash flow information
Decrease in capital expenditures not paid	(117)	(201)
Atlantic City Electric Company
Cash flows from operating activities
Net income	29	33
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization, and accretion	74	67
Deferred income taxes and amortization of investment tax credits	7	6
Other non-cash operating activities	2	(9)
Changes in assets and liabilities:
Accounts receivable	(12)	24
Receivables from and payables to affiliates, net	(5)	(1)
Inventories	(3)	(3)
Accounts payable and accrued expenses	(1)	(15)
Collateral paid, net	1	(44)
Income taxes	3	5
Regulatory assets and liabilities, net	(47)	3
Pension and non-pension postretirement benefit contributions	(7)	(1)
Other assets and liabilities	(13)	(21)
Net cash flows provided by operating activities	28	44
Cash flows from investing activities
Capital expenditures	(89)	(161)
Net cash flows used in investing activities	(89)	(161)
Cash flows from financing activities
Changes in short-term borrowings	(199)	0
Issuance of long-term debt	75	75
Changes in Exelon intercompany money pool	134	0
Dividends paid on common stock	(22)	(21)
Contributions from parent	81	63
Other financing activities	(2)	(1)
Net cash flows provided by financing activities	67	116
Increase in cash, restricted cash, and cash equivalents	6	(1)
Cash, restricted cash, and cash equivalents at beginning of period	21	72
Cash, restricted cash, and cash equivalents at end of period	27	71
Supplemental cash flow information
Decrease in capital expenditures not paid	$ 4	$ (30)

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - Exelon - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445	$ 522
Restricted cash and cash equivalents	489	482	$ 381
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventories, net
Fossil fuel	37	94
Materials and supplies	751	707
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	3,382	3,232
Investments	263	251
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Long-term debt due within one year	503	1,403
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Mark-to-market derivative liabilities	29	74
Unamortized energy contract liabilities	7	8
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Pension obligations	1,569	1,571
Non-pension postretirement benefit obligations	523	527
Asset retirement obligations	270	267
Mark-to-market derivative liabilities	80	106
Unamortized energy contract liabilities	25	27
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Shareholders’ equity
Common stock	21,129	21,114
Treasury stock, at cost	(123)	(123)
Retained earnings	5,767	5,490
Accumulated other comprehensive loss, net	(712)	(726)
Total shareholders’ equity	26,061	25,755
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Long-term debt to financing trusts	390	390
Nonrelated Party
Current liabilities
Accounts payable	$ 2,814	$ 2,846

Consolidated Balance Sheets - E

Consolidated Balance Sheets - Exelon (Parentheticals) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Accumulated depreciation and amortization	$ 17,711	$ 17,251
Common stock (in dollars)	$ 0	$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares outstanding (in shares)	1,000	999
Treasury stock, common (in shares)	2	2

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) - ComEd - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445
Restricted cash and cash equivalents	489	482
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventories, net
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	3,382	3,232
Investments	263	251
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Long-term Debt and Lease Obligation, Current	503	1,403
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Mark-to-market derivative liabilities	29	74
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Asset retirement obligations	270	267
Non-pension postretirement benefit obligations	523	527
Mark-to-market derivative liabilities	80	106
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Shareholders’ equity
Common stock	21,129	21,114
Retained earnings	5,767	5,490
Total shareholders’ equity	26,061	25,755
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Long-term debt to financing trusts	390	390
Nonrelated Party
Current liabilities
Accounts payable	2,814	2,846
Commonwealth Edison Co
Current assets
Cash and cash equivalents	100	110
Restricted cash and cash equivalents	428	402
Accounts receivable
Customer accounts receivable	1,003	860
Customer allowance for credit losses	(82)	(69)
Customer accounts receivable, net	921	791
Other accounts receivable	230	242
Other allowance for credit losses	(19)	(17)
Other accounts receivable, net	211	225
Inventories, net
Inventories, net	289	279
Regulatory assets	1,137	1,335
Other	141	123
Total current assets	3,230	3,268
Property, plant and equipment, net	29,371	29,088
Deferred debits and other assets
Regulatory assets	2,706	2,794
Goodwill	2,625	2,625
Receivable related to Regulatory Agreement Units	3,078	2,954
Investments	6	6
Prepaid pension asset	1,207	1,217
Total deferred debits and other assets	10,531	10,471
Total assets	43,132	42,827
Current liabilities
Short-term borrowings	730	602
Long-term Debt and Lease Obligation, Current	250	250
Accrued expenses	414	576
Customer deposits	122	118
Regulatory liabilities	191	191
Mark-to-market derivative liabilities	29	27
Total current liabilities	2,881	2,922
Long-term debt	11,237	11,236
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	5,384	5,327
Regulatory liabilities	7,697	7,493
Asset retirement obligations	150	149
Non-pension postretirement benefit obligations	163	161
Mark-to-market derivative liabilities	79	106
Other	935	865
Total deferred credits and other liabilities	14,408	14,101
Total liabilities	28,731	28,464
Commitments and contingencies
Shareholders’ equity
Common stock	1,588	1,588
Other paid-in capital	10,440	10,401
Retained earnings	2,373	2,374
Total shareholders’ equity	14,401	14,363
Total liabilities and shareholders’ equity	43,132	42,827
Commonwealth Edison Co | Related Party
Accounts receivable
Receivables from affiliates	3	3
Current liabilities
Accounts payable	72	72
Long-term debt to financing trusts	205	205
Commonwealth Edison Co | Nonrelated Party
Deferred debits and other assets
Other	909	875
Current liabilities
Accounts payable	859	867
Other	$ 214	$ 219

Consolidated Balance Sheets - C

Consolidated Balance Sheets - ComEd (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accumulated depreciation and amortization	$ 17,711	$ 17,251
Commonwealth Edison Co
Accumulated depreciation and amortization	$ 7,409	$ 7,222

Consolidated Balance Sheets (_3

Consolidated Balance Sheets (Unaudited) - PECO - USD ($) shares in Millions, $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445
Restricted cash and cash equivalents	489	482
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventories, net
Fossil fuel	37	94
Materials and supplies	751	707
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Receivable related to Regulatory Agreement Units	3,382	3,232
Investments	263	251
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Asset retirement obligations	270	267
Pension obligations	1,569	1,571
Non-pension postretirement benefit obligations	523	527
Mark-to-market derivative liabilities	80	106
Unamortized energy contract liabilities	25	27
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Common stock (in dollars)	$ 0	$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares outstanding (in shares)	1,000	999
Shareholders’ equity
Common stock	$ 21,129	$ 21,114
Treasury stock, common (in shares)	2	2
Treasury stock, at cost	$ (123)	$ (123)
Accumulated other comprehensive loss, net	(712)	(726)
Retained earnings	5,767	5,490
Total shareholders’ equity	26,061	25,755
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Long-term debt to financing trusts	390	390
Nonrelated Party
Current liabilities
Accounts payable	2,814	2,846
PECO Energy Co
Current assets
Cash and cash equivalents	39	42
Restricted cash and cash equivalents	9	9
Accounts receivable
Customer accounts receivable	562	527
Customer allowance for credit losses	(107)	(95)
Customer accounts receivable, net	455	432
Other accounts receivable	160	117
Other allowance for credit losses	(13)	(8)
Other accounts receivable, net	147	109
Inventories, net
Fossil fuel	22	50
Materials and supplies	76	67
Prepaid utility taxes	128	2
Regulatory assets	128	127
Other	78	63
Total current assets	1,082	903
Property, plant and equipment, net	13,399	13,128
Deferred debits and other assets
Regulatory assets	834	793
Receivable related to Regulatory Agreement Units	304	278
Investments	37	35
Prepaid pension asset	432	429
Total deferred debits and other assets	1,635	1,564
Total assets	16,116	15,595
Current liabilities
Short-term borrowings	0	165
Accrued expenses	198	236
Customer deposits	78	79
Renewable energy credits, current	54	36
Regulatory liabilities	83	92
Total current liabilities	1,009	1,182
Long-term debt	5,134	5,134
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,349	2,321
Regulatory liabilities	340	314
Asset retirement obligations	27	26
Non-pension postretirement benefit obligations	287	286
Other	88	79
Total deferred credits and other liabilities	3,091	3,026
Total liabilities	9,418	9,526
Commitments and contingencies
Shareholders’ equity
Common stock	4,630	4,050
Retained earnings	2,068	2,019
Total shareholders’ equity	6,698	6,069
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	16,116	15,595
PECO Energy Co | Related Party
Accounts receivable
Receivables from affiliates	0	2
Current liabilities
Accounts payable	41	39
Long-term debt to financing trusts	184	184
PECO Energy Co | Nonrelated Party
Deferred debits and other assets
Other	28	29
Current liabilities
Accounts payable	524	512
Other	$ 31	$ 23

Consolidated Balance Sheets - P

Consolidated Balance Sheets - PECO (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accumulated depreciation and amortization	$ 17,711	$ 17,251
PECO Energy Co
Accumulated depreciation and amortization	$ 4,149	$ 4,097

Balance Sheets (Unaudited) - BG

Balance Sheets (Unaudited) - BGE - USD ($) shares in Millions, $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445
Restricted cash and cash equivalents	489	482
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventories, net
Fossil fuel	37	94
Materials and supplies	751	707
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	3,382	3,232
Investments	263	251
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Long-term debt due within one year	503	1,403
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Mark-to-market derivative liabilities	29	74
Unamortized energy contract liabilities	7	8
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Asset retirement obligations	270	267
Pension obligations	1,569	1,571
Non-pension postretirement benefit obligations	523	527
Mark-to-market derivative liabilities	80	106
Unamortized energy contract liabilities	25	27
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Common stock (in dollars)	$ 0	$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares outstanding (in shares)	1,000	999
Shareholders’ equity
Common stock	$ 21,129	$ 21,114
Treasury stock, common (in shares)	2	2
Treasury stock, at cost	$ (123)	$ (123)
Accumulated other comprehensive loss, net	(712)	(726)
Retained earnings	5,767	5,490
Total shareholders’ equity	26,061	25,755
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Long-term debt to financing trusts	390	390
Nonrelated Party
Current liabilities
Accounts payable	2,814	2,846
Baltimore Gas and Electric Company
Current assets
Cash and cash equivalents	27	47
Restricted cash and cash equivalents	0	1
Accounts receivable
Customer accounts receivable	618	527
Customer allowance for credit losses	(52)	(46)
Customer accounts receivable, net	566	481
Other accounts receivable	104	106
Other allowance for credit losses	(7)	(7)
Other accounts receivable, net	97	99
Inventories, net
Fossil fuel	13	35
Materials and supplies	82	74
Prepaid utility taxes	54	56
Regulatory assets	237	229
Other	18	25
Total current assets	1,094	1,047
Property, plant and equipment, net	12,291	12,102
Deferred debits and other assets
Regulatory assets	742	727
Investments	10	9
Prepaid pension asset	253	248
Total deferred debits and other assets	1,059	1,035
Total assets	14,444	14,184
Current liabilities
Short-term borrowings	406	336
Accrued expenses	249	203
Customer deposits	115	114
Regulatory liabilities	26	27
Total current liabilities	1,195	1,093
Long-term debt	4,602	4,602
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,016	1,945
Regulatory liabilities	699	773
Asset retirement obligations	32	32
Non-pension postretirement benefit obligations	153	158
Other	85	91
Total deferred credits and other liabilities	2,985	2,999
Total liabilities	8,782	8,694
Commitments and contingencies
Shareholders’ equity
Common stock	3,246	3,246
Retained earnings	2,416	2,244
Total shareholders’ equity	5,662	5,490
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	14,444	14,184
Baltimore Gas and Electric Company | Related Party
Accounts receivable
Receivables from affiliates	0	0
Current liabilities
Accounts payable	37	35
Baltimore Gas and Electric Company | Nonrelated Party
Deferred debits and other assets
Other	54	51
Current liabilities
Accounts payable	338	344
Other	$ 24	$ 34

Balance Sheets - BGE (Parenthet

Balance Sheets - BGE (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accumulated depreciation and amortization	$ 17,711	$ 17,251
Baltimore Gas and Electric Company
Accumulated depreciation and amortization	$ 4,817	$ 4,744

Consolidated Balance Sheets (_4

Consolidated Balance Sheets (Unaudited) - PHI - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445
Restricted cash and cash equivalents	489	482
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventories, net
Fossil fuel	37	94
Materials and supplies	751	707
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Goodwill	6,630	6,630
Investments	263	251
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Long-term debt due within one year	503	1,403
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Unamortized energy contract liabilities	7	8
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Asset retirement obligations	270	267
Non-pension postretirement benefit obligations	523	527
Unamortized energy contract liabilities	25	27
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Members' Equity [Abstract]
Retained earnings	5,767	5,490
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Nonrelated Party
Current liabilities
Accounts payable	2,814	2,846
Pepco Holdings LLC
Current assets
Cash and cash equivalents	504	180
Restricted cash and cash equivalents	23	24
Accounts receivable
Customer accounts receivable	714	745
Customer allowance for credit losses	(105)	(107)
Customer accounts receivable, net	609	638
Other accounts receivable	321	310
Other allowance for credit losses	(57)	(50)
Other accounts receivable, net	264	260
Inventories, net
Fossil fuel	3	9
Materials and supplies	304	287
Regulatory assets	342	337
Other	82	100
Total current assets	2,135	1,838
Property, plant and equipment, net	19,121	18,851
Deferred debits and other assets
Regulatory assets	1,606	1,587
Goodwill	4,005	4,005
Investments	145	143
Prepaid pension asset	314	268
Total deferred debits and other assets	6,279	6,214
Total assets	27,535	26,903
Current liabilities
Short-term borrowings	0	394
Long-term debt due within one year	244	644
Accrued expenses	344	338
Customer deposits	104	100
Regulatory liabilities	89	71
Unamortized energy contract liabilities	7	8
PPA termination obligation	31	49
Total current liabilities	1,728	2,549
Long-term debt	8,909	8,004
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	3,071	3,031
Regulatory liabilities	878	904
Asset retirement obligations	56	55
Non-pension postretirement benefit obligations	37	40
Unamortized energy contract liabilities	25	27
Other	512	511
Total deferred credits and other liabilities	4,579	4,568
Total liabilities	15,216	15,121
Commitments and contingencies
Members' Equity [Abstract]
Membership interest	12,544	12,057
Retained earnings	(225)	(275)
Total members' equity	12,319	11,782
Total liabilities and shareholders’ equity	27,535	26,903
Pepco Holdings LLC | Related Party
Accounts receivable
Receivables from affiliates	4	3
Current liabilities
Accounts payable	60	59
Other	73	65
Pepco Holdings LLC | Nonrelated Party
Deferred debits and other assets
Other	209	211
Current liabilities
Accounts payable	668	683
Other	$ 108	$ 138

Consolidated Balance Sheets -_2

Consolidated Balance Sheets - PHI (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accumulated depreciation and amortization	$ 17,711	$ 17,251
Pepco Holdings LLC
Accumulated depreciation and amortization	$ 3,302	$ 3,175

Balance Sheets (Unaudited) - Pe

Balance Sheets (Unaudited) - Pepco - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445
Restricted cash and cash equivalents	489	482
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventories, net
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Investments	263	251
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Long-term debt due within one year	503	1,403
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Asset retirement obligations	270	267
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Shareholders’ equity
Common stock	21,129	21,114
Retained earnings	5,767	5,490
Total shareholders’ equity	26,061	25,755
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Nonrelated Party
Current liabilities
Accounts payable	2,814	2,846
Potomac Electric Power Company
Current assets
Cash and cash equivalents	198	48
Restricted cash and cash equivalents	22	24
Accounts receivable
Customer accounts receivable	349	369
Customer allowance for credit losses	(52)	(52)
Customer accounts receivable, net	297	317
Other accounts receivable	156	166
Other allowance for credit losses	(35)	(28)
Other accounts receivable, net	121	138
Inventories, net
Inventories, net	169	159
Regulatory assets	133	150
Other	35	51
Total current assets	1,110	889
Property, plant and equipment, net	9,584	9,430
Deferred debits and other assets
Regulatory assets	467	450
Investments	127	124
Prepaid pension asset	240	246
Total deferred debits and other assets	891	875
Total assets	11,585	11,194
Current liabilities
Short-term borrowings	0	132
Long-term debt due within one year	5	405
Accrued expenses	209	191
Customer deposits	49	47
Regulatory liabilities	23	15
Merger related obligation	23	25
Total current liabilities	685	1,229
Long-term debt	4,354	3,691
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,448	1,431
Regulatory liabilities	368	382
Asset retirement obligations	38	37
Other	273	280
Total deferred credits and other liabilities	2,127	2,130
Total liabilities	7,166	7,050
Commitments and contingencies
Shareholders’ equity
Common stock	3,326	3,075
Retained earnings	1,093	1,069
Total shareholders’ equity	4,419	4,144
Total liabilities and shareholders’ equity	11,585	11,194
Potomac Electric Power Company | Related Party
Accounts receivable
Receivables from affiliates	1	2
Receivable from PHI intercompany money pool	134	0
Current liabilities
Accounts payable	37	32
Potomac Electric Power Company | Nonrelated Party
Deferred debits and other assets
Other	57	55
Current liabilities
Accounts payable	304	321
Other	$ 35	$ 61

Balance Sheets (Unaudited) - _2

Balance Sheets (Unaudited) - Pepco (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accumulated depreciation and amortization	$ 17,711	$ 17,251
Potomac Electric Power Company
Accumulated depreciation and amortization	$ 4,341	$ 4,284

Balance Sheets (Unaudited) - DP

Balance Sheets (Unaudited) - DPL - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445
Restricted cash and cash equivalents	489	482
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventories, net
Fossil fuel	37	94
Materials and supplies	751	707
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Long-term debt due within one year	503	1,403
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Asset retirement obligations	270	267
Non-pension postretirement benefit obligations	523	527
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Shareholders’ equity
Common stock	21,129	21,114
Retained earnings	5,767	5,490
Total shareholders’ equity	26,061	25,755
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Nonrelated Party
Current liabilities
Accounts payable	2,814	2,846
Delmarva Power and Light Company
Current assets
Cash and cash equivalents	269	16
Restricted cash and cash equivalents	1	0
Accounts receivable
Customer accounts receivable	186	183
Customer allowance for credit losses	(17)	(19)
Customer accounts receivable, net	169	164
Other accounts receivable	51	52
Other allowance for credit losses	(8)	(8)
Other accounts receivable, net	43	44
Inventories, net
Fossil fuel	3	9
Materials and supplies	77	72
Prepaid utility taxes	13	24
Regulatory assets	56	54
Other	20	14
Total current assets	651	398
Property, plant and equipment, net	5,245	5,165
Deferred debits and other assets
Regulatory assets	212	218
Prepaid pension asset	132	135
Other	51	50
Total deferred debits and other assets	395	403
Total assets	6,291	5,966
Current liabilities
Short-term borrowings	0	63
Long-term debt due within one year	85	84
Accrued expenses	86	64
Customer deposits	32	31
Regulatory liabilities	61	50
Total current liabilities	464	497
Long-term debt	2,169	1,996
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	919	904
Regulatory liabilities	356	365
Asset retirement obligations	13	12
Non-pension postretirement benefit obligations	5	6
Other	97	93
Total deferred credits and other liabilities	1,390	1,380
Total liabilities	4,023	3,873
Commitments and contingencies
Shareholders’ equity
Common stock	1,609	1,455
Retained earnings	659	638
Total shareholders’ equity	2,268	2,093
Total liabilities and shareholders’ equity	6,291	5,966
Delmarva Power and Light Company | Related Party
Accounts receivable
Receivables from affiliates	0	1
Current liabilities
Accounts payable	25	25
Delmarva Power and Light Company | Nonrelated Party
Current liabilities
Accounts payable	157	159
Other	$ 18	$ 21

Balance Sheets - DPL (Parenthet

Balance Sheets - DPL (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accumulated depreciation and amortization	$ 17,711	$ 17,251
Delmarva Power and Light Company
Accumulated depreciation and amortization	$ 1,961	$ 1,925

Consolidated Balance Sheets (_5

Consolidated Balance Sheets (Unaudited) - ACE - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 720	$ 445
Accounts receivable
Customer accounts receivable	2,896	2,659
Customer allowance for credit losses	(346)	(317)
Customer accounts receivable, net	2,550	2,342
Other accounts receivable	1,131	1,101
Other allowance for credit losses	(96)	(82)
Other accounts receivable, net	1,035	1,019
Inventory, net
Regulatory assets	2,035	2,215
Other	595	473
Total current assets	8,212	7,777
Property, plant and equipment, net	74,604	73,593
Deferred debits and other assets
Regulatory assets	8,701	8,698
Other	1,419	1,365
Total deferred debits and other assets	20,395	20,176
Total assets	103,211	101,546
Current liabilities
Short-term borrowings	2,206	2,523
Long-term debt due within one year	503	1,403
Accrued expenses	1,076	1,375
Customer deposits	419	411
Regulatory liabilities	400	389
Other	516	557
Total current liabilities	7,975	9,591
Long-term debt	42,271	39,692
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	12,199	11,956
Regulatory liabilities	9,706	9,576
Non-pension postretirement benefit obligations	523	527
Other	2,142	2,088
Total deferred credits and other liabilities	26,514	26,118
Total liabilities	77,150	75,791
Commitments and contingencies
Shareholders’ equity
Common stock	21,129	21,114
Retained earnings	5,767	5,490
Total shareholders’ equity	26,061	25,755
Total liabilities and shareholders’ equity	103,211	101,546
Related Party
Current liabilities
Accounts payable	5	5
Nonrelated Party
Current liabilities
Accounts payable	2,814	2,846
Atlantic City Electric Company
Current assets
Cash and cash equivalents	27	21
Accounts receivable
Customer accounts receivable	178	194
Customer allowance for credit losses	(36)	(36)
Customer accounts receivable, net	142	158
Other accounts receivable	115	92
Other allowance for credit losses	(14)	(14)
Other accounts receivable, net	101	78
Inventory, net
Inventories, net	58	55
Regulatory assets	145	125
Other	7	5
Total current assets	484	445
Property, plant and equipment, net	4,232	4,192
Deferred debits and other assets
Regulatory assets	497	483
Prepaid pension asset	6	3
Other	34	34
Total deferred debits and other assets	537	520
Total assets	5,253	5,157
Current liabilities
Short-term borrowings	0	199
Long-term debt due within one year	154	154
Accrued expenses	45	42
Customer deposits	23	23
Regulatory liabilities	5	6
PPA termination obligation	31	49
Total current liabilities	620	702
Long-term debt	1,755	1,679
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	780	771
Regulatory liabilities	137	140
Non-pension postretirement benefit obligations	3	4
Other	58	49
Total deferred credits and other liabilities	978	964
Total liabilities	3,353	3,345
Commitments and contingencies
Shareholders’ equity
Common stock	1,911	1,830
Retained earnings	(11)	(18)
Total shareholders’ equity	1,900	1,812
Total liabilities and shareholders’ equity	5,253	5,157
Atlantic City Electric Company | Related Party
Accounts receivable
Receivables from affiliates	4	3
Current liabilities
Accounts payable	22	25
Other	134	0
Atlantic City Electric Company | Nonrelated Party
Current liabilities
Accounts payable	195	192
Other	$ 11	$ 12

Consolidated Balance Sheets - A

Consolidated Balance Sheets - ACE (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accumulated depreciation and amortization	$ 17,711	$ 17,251
Atlantic City Electric Company
Accumulated depreciation and amortization	$ 1,702	$ 1,684

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders Equity (Unaudited) - Exelon - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Treasury Stock, Common	Retained Earnings	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance (in shares) at Dec. 31, 2022	995,830
Beginning balance at Dec. 31, 2022	$ 24,744	$ 20,908	$ (123)	$ 4,597	$ (638)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669			669
Long -Term Incentive Plan Activity (shares)	306
Long-Term Incentive Plan Activity	$ 1	1
Employee stock purchase plan issuances (shares)	266
Employee stock purchase plan issuances	$ 12	12
Common stock dividends (in dollars per share)	$ 0.36
Common stock dividends	$ (359)			(359)
Other comprehensive income (loss), net of income taxes	$ (1)				(1)
Ending balance (in shares) at Mar. 31, 2023	996,402
Ending balance at Mar. 31, 2023	$ 25,066	20,921	(123)	4,907	(639)
Beginning balance (in shares) at Dec. 31, 2023	1,001,249
Beginning balance at Dec. 31, 2023	$ 25,755	21,114	(123)	5,490	(726)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 658			658
Long -Term Incentive Plan Activity (shares)	333
Long-Term Incentive Plan Activity	$ 2	2
Employee stock purchase plan issuances (shares)	276
Employee stock purchase plan issuances	$ 13	13
Common stock dividends (in dollars per share)	$ 0.38
Common stock dividends	$ (381)			(381)
Other comprehensive income (loss), net of income taxes	$ 14				14
Ending balance (in shares) at Mar. 31, 2024	1,001,858
Ending balance at Mar. 31, 2024	$ 26,061	$ 21,129	$ (123)	$ 5,767	$ (712)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders Equity - Exelon (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Common stock dividends (in dollars per share)	$ 0.38	$ 0.36

Consolidated Statements of Ch_3

Consolidated Statements of Changes in Shareholders Equity (Unaudited) - ComEd - USD ($) $ in Millions	Total	Retained Earnings	Commonwealth Edison Co	Commonwealth Edison Co Common Stock	Commonwealth Edison Co Other Paid-in-Capital [Member]	Commonwealth Edison Co Retained Earnings
Beginning Balance at Dec. 31, 2022			$ 13,364	$ 1,588	$ 9,746	$ 2,030
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	241			241
Common stock dividends	(359)	(359)	(187)			(187)
Contributions from parent			186		186
Ending Balance at Mar. 31, 2023			13,604	1,588	9,932	2,084
Beginning Balance at Dec. 31, 2023	25,755		14,363	1,588	10,401	2,374
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	658	658	193			193
Common stock dividends	(381)	$ (381)	(194)			(194)
Contributions from parent			39		39
Ending Balance at Mar. 31, 2024	$ 26,061		$ 14,401	$ 1,588	$ 10,440	$ 2,373

Consolidated Statements of Ch_4

Consolidated Statements of Changes in Shareholders Equity (Unaudited) - PECO - USD ($) $ in Millions	Total	Retained Earnings	PECO Energy Co	PECO Energy Co Common Stock	PECO Energy Co Retained Earnings
Beginning Balance at Dec. 31, 2022			$ 5,563	$ 3,702	$ 1,861
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	166		166
Common stock dividends	(359)	(359)	(101)		(101)
Contributions from parent			330	330
Ending Balance at Mar. 31, 2023			5,958	4,032	1,926
Beginning Balance at Dec. 31, 2023	25,755		6,069	4,050	2,019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	658	658	149		149
Common stock dividends	(381)	$ (381)	(100)		(100)
Contributions from parent			580	580
Ending Balance at Mar. 31, 2024	$ 26,061		$ 6,698	$ 4,630	$ 2,068

Statements of Changes in Shareh

Statements of Changes in Shareholders Equity (Unaudited) - BGE - USD ($) $ in Millions	Total	Retained Earnings	Baltimore Gas and Electric Company	Baltimore Gas and Electric Company Common Stock	Baltimore Gas and Electric Company Retained Earnings
Beginning Balance at Dec. 31, 2022			$ 4,936	$ 2,861	$ 2,075
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	200		200
Common stock dividends	(359)	(359)	(80)		(80)
Contributions from parent			237	237
Ending Balance at Mar. 31, 2023			5,293	3,098	2,195
Beginning Balance at Dec. 31, 2023	25,755		5,490	3,246	2,244
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	658	658	264		264
Common stock dividends	(381)	$ (381)	(92)		(92)
Ending Balance at Mar. 31, 2024	$ 26,061		$ 5,662	$ 3,246	$ 2,416

Consolidated Statements of Ch_5

Consolidated Statements of Changes in Member's Equity (Unaudited) - PHI - USD ($) $ in Millions	Total	Undistributed (Losses)/Gains	Pepco Holdings LLC	Pepco Holdings LLC Membership Interest	Pepco Holdings LLC Undistributed (Losses)/Gains
Beginning Balance at Dec. 31, 2022			$ 11,230	$ 11,582	$ (352)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	155		155
Distributions to member			(112)		(112)
Contributions from member			405	405
Ending Balance at Mar. 31, 2023			11,678	11,987	(309)
Beginning Balance at Dec. 31, 2023			11,782	12,057	(275)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 658	$ 658	168		168
Distributions to member			(118)		(118)
Contributions from member			487	487
Ending Balance at Mar. 31, 2024			$ 12,319	$ 12,544	$ (225)

Statements of Changes in Shar_2

Statements of Changes in Shareholders Equity (Unaudited) - Pepco - USD ($) $ in Millions	Total	Retained Earnings	Potomac Electric Power Company	Potomac Electric Power Company Common Stock	Potomac Electric Power Company Retained Earnings
Beginning Balance at Dec. 31, 2022			$ 3,782	$ 2,767	$ 1,015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	65		65
Common stock dividends	(359)	(359)	(48)		(48)
Contributions from parent			243	243
Ending Balance at Mar. 31, 2023			4,042	3,010	1,032
Beginning Balance at Dec. 31, 2023	25,755		4,144	3,075	1,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	658	658	75		75
Common stock dividends	(381)	$ (381)	(51)		(51)
Contributions from parent			251	251
Ending Balance at Mar. 31, 2024	$ 26,061		$ 4,419	$ 3,326	$ 1,093

Statements of Changes in Shar_3

Statements of Changes in Shareholders Equity (Unaudited) - DPL - USD ($) $ in Millions	Total	Retained Earnings	Delmarva Power and Light Company	Delmarva Power and Light Company Common Stock	Delmarva Power and Light Company Retained Earnings
Beginning Balance at Dec. 31, 2022			$ 1,950	$ 1,356	$ 594
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	60		60
Common stock dividends	(359)	(359)	(42)		(42)
Contributions from parent			99	99
Ending Balance at Mar. 31, 2023			2,067	1,455	612
Beginning Balance at Dec. 31, 2023	25,755		2,093	1,455	638
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	658	658	66		66
Common stock dividends	(381)	$ (381)	(45)		(45)
Contributions from parent			154	154
Ending Balance at Mar. 31, 2024	$ 26,061		$ 2,268	$ 1,609	$ 659

Consolidated Statements of Ch_6

Consolidated Statements of Changes in Shareholders Equity (Unaudited) - ACE - USD ($) $ in Millions	Total	Retained Earnings	Atlantic City Electric Company	Atlantic City Electric Company Common Stock	Atlantic City Electric Company Retained Earnings
Beginning Balance at Dec. 31, 2022			$ 1,753	$ 1,765	$ (12)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 669	$ 669	33		33
Common stock dividends	(359)	(359)	(21)		(21)
Contributions from parent			63	63
Ending Balance at Mar. 31, 2023			1,828	1,828	0
Beginning Balance at Dec. 31, 2023	25,755		1,812	1,830	(18)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	658	658	29		29
Common stock dividends	(381)	$ (381)	(22)		(22)
Contributions from parent			81	81
Ending Balance at Mar. 31, 2024	$ 26,061		$ 1,900	$ 1,911	$ (11)

Significant Accounting Policies

Significant Accounting Policies (All Registrants)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Significant Accounting Policies (All Registrants)	Significant Accounting Policies (All Registrants) Description of Business Exelon is a utility services holding company engaged in the energy transmission and distribution businesses through ComEd, PECO, BGE, Pepco, DPL, and ACE. Name of Registrant Business Service Territories Commonwealth Edison Company Purchase and regulated retail sale of electricity Northern Illinois, including the City of Chicago Transmission and distribution of electricity to retail customers PECO Energy Company Purchase and regulated retail sale of electricity and natural gas Southeastern Pennsylvania, including the City of Philadelphia (electricity) Transmission and distribution of electricity and distribution of natural gas to retail customers Pennsylvania counties surrounding the City of Philadelphia (natural gas) Baltimore Gas and Electric Company Purchase and regulated retail sale of electricity and natural gas Central Maryland, including the City of Baltimore (electricity and natural gas) Transmission and distribution of electricity and distribution of natural gas to retail customers Pepco Holdings LLC Utility services holding company engaged, through its reportable segments Pepco, DPL, and ACE Service Territories of Pepco, DPL, and ACE Potomac Electric Purchase and regulated retail sale of electricity District of Columbia, and major portions of Montgomery and Prince George’s Counties, Maryland Transmission and distribution of electricity to retail customers Delmarva Power & Purchase and regulated retail sale of electricity and natural gas Portions of Delaware and Maryland (electricity) Transmission and distribution of electricity and distribution of natural gas to retail customers Portions of New Castle County, Delaware (natural gas) Atlantic City Electric Company Purchase and regulated retail sale of electricity Portions of Southern New Jersey Transmission and distribution of electricity to retail customers Basis of Presentation This is a combined quarterly report of all Registrants. The Notes to the Consolidated Financial Statements apply to the Registrants as indicated parenthetically next to each corresponding disclosure. When appropriate, the Registrants are named specifically for their related activities and disclosures. Each of the Registrant’s Consolidated Financial Statements includes the accounts of its subsidiaries. All intercompany transactions have been eliminated. Through its business services subsidiary, BSC, Exelon provides its subsidiaries with a variety of support services at cost, including legal, human resources, financial, information technology, and supply management services. PHI also has a business services subsidiary, PHISCO, which provides a variety of support services at cost, including legal, finance, engineering, customer operations, distribution and transmission planning, asset management, system operations, and power procurement, to PHI operating companies. The costs of BSC and PHISCO are directly charged or allocated to the applicable subsidiaries. The results of Exelon’s corporate operations are presented as “Other” in the consolidated financial statements and include intercompany eliminations unless otherwise disclosed. The accompanying consolidated financial statements as of March 31, 2024 and for the three months ended March 31, 2024 and 2023 are unaudited but, in the opinion of each Registrant's management, the Registrants include all adjustments that are considered necessary for a fair statement of the Registrants’ respective financial statements in accordance with GAAP. All adjustments are of a normal, recurring nature, except as otherwise disclosed. The December 31, 2023 Consolidated Balance Sheets were derived from audited financial statements. The interim financial statements are to be read in conjunction with prior annual financial statements and notes. Additionally, 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, 2024. 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. New Accounting Standards (All Registrants) New Accounting Standards Issued and Not Yet Adopted as of March 31, 2024: The following new authoritative accounting guidance issued by the FASB has not yet been adopted and reflected by the Registrants in their consolidated financial statements as of March 31, 2024. Unless otherwise indicated, the Registrants are currently assessing the impacts such guidance may have (which could be material) in their Consolidated Balance Sheets, Consolidated Statements of Operations and Comprehensive Income, Consolidated Statements of Cash Flows and disclosures, as well as the potential to early adopt where applicable. The Registrants have assessed other FASB issuances of new standards which are not listed below given the current expectation that such standards will not significantly impact the Registrants' financial reporting. Segment Reporting (Issued November 2023). Improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The objective of the revised guidance is to introduce a new requirement to disclose significant segment expenses regularly provided to the CODM, extend certain annual disclosures to interim periods, clarify single reportable segment entities must apply ASC 280 in its entirety, permit more than one measure of segment profit or loss to be reported under certain conditions, and require disclosure of the title and position of the CODM. The standard is effective for annual periods beginning January 1, 2024 and interim periods beginning January 1, 2025, with early adoption permitted. The standard will be applied retrospectively. Improvement to Income Tax Disclosures (Issued December 2023).

Regulatory Matters (All Registr

Regulatory Matters (All Registrants)	3 Months Ended
	Mar. 31, 2024
Regulated Operations [Abstract]
Regulatory Matters (All Registrants)	Regulatory Matters (All Registrants) As discussed in Note 3 — Regulatory Matters of the 2023 Form 10-K, the Registrants are involved in rate and regulatory proceedings at FERC and their state commissions. The following discusses developments in 2024 and updates to the 2023 Form 10-K. Distribution Base Rate Case Proceedings The following tables show the completed and pending distribution base rate case proceedings in 2024. Completed Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Approved Revenue Requirement Increase Approved ROE Approval Date Rate Effective Date ComEd - Illinois January 17, 2023 Electric $ 1,487 $ 501 8.905% December 14, 2023 (a) January 1, 2024 $ 838 $ 810 8.905% April 18, 2024 (b) May 1, 2024 April 21, 2023 (c) Electric $ 247 $ 259 8.91% November 30, 2023 January 1, 2024 BGE - Maryland (d) February 17, 2023 Electric $ 313 $ 179 9.50% December 14, 2023 January 1, 2024 Natural Gas $ 289 $ 229 9.45% Pepco - Maryland (e) October 26, 2020 (amended March 31, 2021) Electric $ 104 $ 52 9.55% June 28, 2021 June 28, 2021 DPL - Maryland (f) May 19, 2022 Electric $ 38 $ 29 9.60% December 14, 2022 January 1, 2023 DPL - Delaware December 15, 2022 (amended September 29, 2023) Electric $ 39 $ 28 9.60% April 18, 2024 July 15, 2023 ACE - New Jersey (g) February 15, 2023 (amended August 21, 2023) Electric $ 92 $ 45 9.60% November 17, 2023 December 1, 2023 __________ (a) Reflects a four-year cumulative multi-year rate plan for January 1, 2024 to December 31, 2027. On December 14, 2023, the ICC approved year-over-year distribution revenue requirement increases in 2024-2027, with an amendatory order on January 10, 2024, of approximately $451 million effective January 1, 2024, $14 million effective January 1, 2025, $6 million effective January 1, 2026, and $30 million effective January 1, 2027, based on an ROE of 8.905%, an equity ratio of 50%, and year end 2022 rate base. The ICC rejected ComEd’s Grid Plan, requiring ComEd to file a revised Grid Plan by March 13, 2024, 90 days after the issuance of the December final order. The ICC also directed that the revised Grid Plan would be reviewed through further formal proceedings in that docket. On January 10, 2024, the ICC granted one portion of ComEd’s application for rehearing of the December 14, 2023 final order, and directed that a rehearing process extending no more than 150 days reconsider certain components of the revenue requirements for the test years (2024-2027), absent an approved Grid Plan. On January 10, 2024, ComEd also filed with the Illinois appellate court an appeal of various aspects of the ICC’s final order on which rehearing was denied, including the 8.905% ROE and 50% equity ratio and denial of any return on ComEd’s pension asset. On March 13, 2024, ComEd filed its revised Grid Plan (Refiled Grid Plan) with supporting testimony and schedules with the ICC. On March 15, 2024, ComEd filed a petition to adjust its MRP to authorize increased rates consistent with the Refiled Grid Plan. (b) Reflects four-year cumulative increase to the revenue requirement approved on December 14, 2023 and amended on January 10, 2024 of $810 million for January 1, 2024 to December 31, 2027 resulting from the rehearing on certain components of the rate plan. On February 16, 2024, ComEd filed a revised revenue request for an $838 million increase in its 2024-2027 revenue requirements based on the ICC’s limited scope for rehearing which included the value of the 2023 forecasted year-end rate base. On April 18, 2024, the ICC issued an order on the rehearing filing which increased the revenue requirements previously approved by the ICC in its January 10, 2024, amendatory order by $150 million in 2024, $186 million in 2025, $221 million in 2026 and $253 million in 2027. ComEd anticipates that the revenue requirements determined during the rehearing process will be further adjusted upon approval of the Refiled Grid Plan and the pending petition to adjust rates. (c) On November 30, 2023, the Delivery Reconciliation Amount for 2022 defined in Rider Delivery Service Pricing Reconciliation (Rider DSPR) was approved. The delivery reconciliation amount allows for the reconciliation of the revenue requirement in effect in the final years in which formula rates are determined and until such time as new rates are established under ComEd’s approved MRP. The 2023 filing reconciled the delivery service rates in effect in 2022 with the actual delivery service costs incurred in 2022. The reconciliation revenue requirement provides for a weighted average debt and equity return on distribution rate base of 6.48%, inclusive of an allowed ROE of 8.91%, reflecting the monthly yields on 30-year treasury bonds plus 580 basis points. (d) Reflects a three-year cumulative multi-year plan for January 1, 2024 through December 31, 2026. The MDPSC awarded BGE electric revenue requirement increases of $41 million, $113 million, and $25 million in 2024, 2025, and 2026, respectively, and natural gas revenue requirement increases of $126 million, $62 million, and $41 million in 2024, 2025, and 2026, respectively. Requested revenue requirement increases will be used to recover capital investments designed to increase the resilience of the electric and gas distribution systems and support Maryland's climate and regulatory initiatives. The MDPSC also approved a portion of the requested 2021 and 2022 reconciliation amounts, which will be recovered through separate electric and gas riders between March 2024 through February 2025. As such, the reconciliation amounts are not included in the approved revenue requirement increases. The 2021 reconciliation amounts are $13 million and $7 million for electric and gas, respectively, and the 2022 reconciliation amounts are $39 million and $15 million for electric and gas, respectively. In April 2024, BGE filed with the MDPSC its request for recovery of the 2023 reconciliation amounts of $79 million and $73 million for electric and gas, respectively, with supporting testimony and schedules. (e) Reflects a three-year cumulative multi-year plan for April 1, 2021 through March 31, 2024. The MDPSC awarded Pepco electric incremental revenue requirement increases of $21 million, $16 million, and $15 million, before offsets, for the 12-month periods ending March 31, 2022, 2023, and 2024, respectively. Pepco proposed to utilize certain tax benefits to fully offset the increase through 2023 and partially offset customer rate increases in 2024. However, the MDPSC only utilized the acceleration of refunds for certain tax benefits to fully offset the increases such that customer rates remain unchanged through March 31, 2022. On February 23, 2022, the MDPSC chose to offset 25% of the cumulative revenue requirement increase for the 12-month period ending March 31, 2023. In 2021, the MDPSC deferred a decision on whether to use certain tax benefits to offset the revenue requirement increases for the 12-month period ending March 31, 2024. In December 2022 Pepco proposed that tax benefits not be used to offset the revenue requirement increases for this period. On January 25, 2023, the MDPSC accepted Pepco’s recommendations not to use tax benefits to offset revenue requirement increases for the 12-month period ending March 31, 2024. (f) Reflects a three-year cumulative multi-year plan for January 1, 2023 through December 31, 2025. The MDPSC awarded DPL electric incremental revenue requirement increases of $17 million, $6 million, and $6 million for 2023, 2024, and 2025, respectively. (g) Requested and approved increases are before New Jersey sales and use tax. The NJBPU awarded ACE electric revenue requirement increases of $36 million and $9 million effective December 1, 2023 and February 1, 2024, respectively. Pending Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Requested ROE Expected Approval Timing ComEd - Illinois March 15, 2024 Electric (a) $ 670 8.905% December 2024 April 26, 2024 Electric (b) $ 627 9.89% December 2024 PECO - Pennsylvania March 28, 2024 Electric (c) $ 464 10.95% Fourth quarter of 2024 Natural Gas $ 111 11.15% Pepco - District of Columbia (d) April 13, 2023 (amended February 27, 2024) Electric $ 186 10.50% Third quarter of 2024 Pepco - Maryland (e) May 16, 2023 (amended February 23, 2024) Electric $ 186 10.50% Second quarter of 2024 __________ (a) On March 13, 2024, ComEd filed its Refiled Grid Plan with the ICC and on March 15, 2024, ComEd filed a petition to adjust its multi-year rate plan to be aligned with ComEd’s Refiled Grid Plan. The adjusted rate plan incorporates changes in the Refiled Grid Plan, which seeks a $670 million increase in revenue requirements over four years above those granted in the ICC’s January 10, 2024, amendatory order. The requested year-over-year increases are $302 million in 2024, $89 million in 2025, $136 million in 2026 and $143 million in 2027. A final order on both the Refiled Grid Plan and the adjusted rate plan petition is expected by December 2024 with new rates effective January 1, 2025. (b) On April 26, 2024, ComEd filed its proposed Delivery Reconciliation Amount of $627 million under Rider DSPR which allows for the reconciliation of the revenue requirement in effect. The 2024 filing reconciles those rates with the actual delivery service costs incurred in 2023. Final order is expected by December 2024 and the reconciliation amount will adjust customer rates in 2025. (c) PECO requested an annual electric revenue requirement increase of $464 million, which is partially offset by a one-time credit of $64 million in 2025. (d) Reflects a three-year cumulative multi-year plan for January 1, 2024 through December 31, 2026 submitted to the DCPSC. Pepco requested total electric revenue requirement increases of $116 million, $35 million, and $35 million in 2024, 2025, and 2026, respectively. Requested revenue requirement increases will be used to recover capital investments designed to advance system-readiness and support the District of Columbia’s climate and clean energy goals. (e) Reflects a three-year cumulative multi-year plan for April 1, 2024 through March 31, 2027 submitted to the MDPSC. Pepco requested total electric revenue requirement increases of $68 million, $53 million, and $51 million effective April 1, 2024, April 1, 2025, and April 1, 2026, respectively through its surrebuttal filing made on February 23, 2024. The plan contains a proposed nine-month extension period with a requested revenue requirement increase of $14 million effective April 1, 2027 through December 31, 2027. Requested revenue requirement increases will be used to recover capital investments designed to advance system-readiness and support Maryland's climate and clean energy goals. On August 7, 2023, the MDPSC issued an order approving a settlement agreement which allows Pepco to establish a revenue deferral mechanism to recover its full Commission-authorized year 1 increase between July 1, 2024 through March 31, 2025 and extend the procedural schedule to address intervenor resource constraints. Transmission Formula Rates The Utility Registrants' transmission rates are each established based on a FERC-approved formula. ComEd, BGE, Pepco, DPL, and ACE are required to file an annual update to the FERC-approved formula on or before May 15, and PECO is required to file on or before May 31, with the resulting rates effective on June 1 of the same year. The annual update for ComEd is based on prior year actual costs and current year projected capital additions (initial year revenue requirement). The update for ComEd also reconciles any differences between the revenue requirement in effect beginning June 1 of the prior year and actual costs incurred for that year (annual reconciliation). The annual update for BGE is based on prior year actual costs and current year projected capital additions, accumulated depreciation, depreciation and amortization expense, and accumulated deferred income taxes. The update for BGE also reconciles any differences between the actual costs and actual revenues for the calendar year (annual reconciliation). For 2024, the following increases/(decreases) were included in ComEd's and BGE's electric transmission formula rate updates: Registrant (a) Initial Revenue Requirement Increase Annual Reconciliation (Decrease) Total Revenue Requirement Increase Allowed Return on Rate Base (b) Allowed ROE (c) ComEd $ 32 $ (12) $ 20 8.14 % 11.50 % BGE $ 42 $ 13 $ 53 (d) 7.47 % 10.50 % __________ (a) All rates are effective June 1, 2024 - May 31, 2025, subject to review by interested parties pursuant to review protocols of ComEd's and BGE's tariffs. (b) Represents the weighted average debt and equity return on transmission rate bases. (c) The rate of return on common equity for ComEd and BGE includes a 50-basis-point incentive adder for being a member of a RTO. (d) The increase in BGE's transmission revenue requirement includes a $2 million reduction related to a FERC-approved dedicated facilities charge to recover the costs of providing transmission service to specifically designated load by BGE. Other State Regulatory Matters Illinois Regulatory Matters CEJA (Exelon and ComEd). On September 15, 2021, the Governor of Illinois signed into law CEJA. CEJA includes, among other features, (1) procurement of CMCs from qualifying nuclear-powered generating facilities, (2) a requirement to file a general rate case or a new four-year MRP no later than January 20, 2023 to establish rates effective after ComEd’s existing performance-based distribution formula rate sunsets, (3) requirements that ComEd and the ICC initiate and conduct various regulatory proceedings on subjects including ethics, spending, grid investments, and performance metrics. ComEd Electric Distribution Rates ComEd filed, and received approval for, its last performance-based electric distribution formula rate update under EIMA in 2022; those rates were in effect throughout 2023. On February 3, 2022, the ICC approved a tariff that establishes the process under which ComEd reconciled its 2022 and will reconcile its 2023 rate year revenue requirements with actual costs. Those reconciliation amounts are determined using the same process used for prior reconciliations under the performance-based electric distribution formula rate. Using that process, for the rate years 2022 and 2023 ComEd will ultimately collect revenues from customers reflecting each year’s actual recoverable costs, year-end rate base, and a weighted average debt and equity return on distribution rate base, with the ROE component based on the annual average of the monthly yields of the 30-year U.S. Treasury bonds plus 580 basis points. In April 2023, ComEd filed its first petition with the ICC to reconcile its 2022 actual costs with the approved revenue requirement that was in effect in 2022; the final order was issued on November 30, 2023, for rates beginning January 2024. On April 26, 2024, ComEd filed with the ICC its 2023 actual costs with the approved revenue requirement that was in effect in 2023; the final order is expected by December 2024, for rates beginning January 2025. Beginning in 2024, ComEd will recover from retail customers, subject to certain exceptions, the costs it incurs to provide electric delivery services either through its electric distribution rate or other recovery mechanisms authorized by CEJA. On January 17, 2023, ComEd filed a petition with the ICC seeking approval of a MRP for 2024-2027. The MRP supports a multi-year grid plan (Grid Plan), also filed on January 17, covering planned investments on the electric distribution system within ComEd’s service area through 2027. Costs incurred during each year of the MRP are subject to ICC review and the plan’s revenue requirement for each year will be reconciled with the actual costs that the ICC determines are prudently and reasonably incurred for that year. The reconciliation is subject to adjustment for certain costs, including a limitation on recovery of costs that are more than 105% of certain costs in the previously approved MRP revenue requirement, absent a modification of the rate plan itself. Thus, for example, the rate adjustments necessary to reconcile 2024 revenues to ComEd’s actual 2024 costs incurred would take effect in January 2026 after the ICC’s review during 2025. On May 22, 2023, direct testimony was filed by ICC staff and more than a dozen intervenors and intervenor groups. The testimonies addressed a wide variety of topics, including rate of return on equity, capital structure, grid planning, various distribution grid and information technology investments, and affordability and customer service. ComEd filed rebuttal testimony in June, which provided, among other things, defense of ComEd’s planned 2024-2027 capital investment and proposed cost of equity. ComEd also made voluntary adjustments and, per the ICC’s final beneficial electrification order requiring ComEd to recover beneficial electrification costs through the MRP, increased its total revenue requirement request from $1.472 billion to $1.545 billion. ComEd filed its reply brief on September 27, 2023, to adjust its total requested revenue requirement increase to $1.487 billion. On December 14, 2023, the ICC issued a final order. The ICC rejected ComEd’s Grid Plan as non-compliant with certain requirements of CEJA, and required ComEd to file a revised Grid Plan by March 13, 2024, 90 days after the issuance of the final order. In the absence of an approved Grid Plan, the ICC set ComEd’s forecast revenue requirements for 2024-2027 based on ComEd's approved year-end 2022 rate base. This results in a total cumulative revenue requirement increase of $501 million, a $986 million total revenue reduction from the requested cumulative revenue requirement increase but remains subject to annual reconciliation in accordance with CEJA. The final order approved the process and formulas associated with the MRP reconciliation mechanisms. The ICC did not approve a previously proposed phase-in of the ICC's approved year-over-year revenue increases, and it also denied ComEd's ability to earn a return on its pension asset. On December 22, 2023, ComEd filed an application for rehearing on several findings in the final order including the use of the 2022 year-end rate base to establish forecast revenue requirements for 2024-2027, ROE, pension asset return, and capital structure. On January 10, 2024, ComEd’s application for rehearing was denied on all issues except for the order’s use of the 2022 year-end rate base. On January 31, 2024, the ICC granted ComEd's motion seeking additional clarification on the scope on rehearing, generally accepting ComEd's proposal and confirming that the rehearing will determine if the forecasted year-end 2023 rate base should be used to set rates for 2024 through 2027 until a refiled Grid Plan is approved. A final rehearing order on that topic is statutorily required by early June 2024. On April 18, 2024, the ICC issued its final order on rehearing and approved increased revenue requirements for 2024-2027. On January 10, 2024, ComEd also filed an appeal in the Illinois Appellate Court of the issues on which rehearing was denied, including but not limited to the allowed ROE and denial of a return on ComEd’s pension asset. There is no deadline by when the appellate court must rule. On March 7, 2024, the ICC adopted an interim order on scheduling, which confirmed that it intends to issue a final order on ComEd’s Refiled Grid Plan by the end of 2024 and that it will implement rates that will go into effect January 1, 2025, inclusive of a Grid Plan. On March 13, 2024, ComEd filed its Refiled Grid Plan with supporting testimony and schedules with the ICC. The Refiled Grid Plan is designed to meet or exceed every requirement identified by the ICC in its December order that rejected ComEd’s initial Grid Plan. On March 15, 2024, ComEd filed a petition to adjust its MRP to authorize increased rates consistent with the Refiled Grid Plan. ComEd has completed and placed in service additional utility plant assets in 2023 and 2024 and will continue to complete and place in service additional utility plant assets prior to the approval of the new Grid Plan. There are still significant unknowns, but ComEd does not currently believe that it is probable that the initially uncollected depreciation or return on the recently completed plant will ultimately be disallowed . In January 2022, ComEd filed a request with the ICC proposing performance metrics that would be used in determining ROE incentives and penalties in the event ComEd filed a MRP in January 2023. On September 27, 2022, the ICC issued a final order approving seven performance metrics that provide symmetrical performance adjustments of 32 total basis points to ComEd’s rate of return on common equity based on the extent to which ComEd achieves the annual performance goals. On November 10, 2022, the ICC granted ComEd's application for rehearing, in part. On April 5, 2023, the ICC issued its final order on rehearing for the performance and tracking metrics proceeding, in which the ICC declined to adopt ComEd's proposed modifications to the reliability and peak load reduction performance metrics. Efforts are underway to implement the performance metrics, which took effect on January 1, 2024. ComEd will make its initial filing in 2025 to assess performance achieved under the metrics in 2024, and to determine any ROE adjustment, which would take effect in 2026. Carbon Mitigation Credit CEJA establishes decarbonization requirements for Illinois as well as programs to support the retention and development of emissions-free sources of electricity. ComEd is required to purchase CMCs from participating nuclear-powered generating facilities between June 1, 2022 and May 31, 2027. The price to be paid for each CMC was established through a competitive bidding process that included consumer-protection measures that capped the maximum acceptable bid amount and a formula that reduces CMC prices by an energy price index, the base residual auction capacity price in the ComEd zone of PJM, and the monetized value of any federal tax credit or other subsidy if applicable. The consumer protection measures contained in CEJA will result in net payments to ComEd ratepayers if the energy index, the capacity price and applicable federal tax credits or subsidy exceed the CMC contract price. In the June 2022 billing period, ComEd began issuing credits to its retail customers under its new CMC rider. A regulatory asset is recorded for the difference between customer credits issued and the credit to be received from the participating nuclear-powered generating facilities. The balance as of March 31, 2024 is $405 million. Under CEJA, the costs of procuring CMCs, including carrying costs, are recovered through a rider, the Rider Carbon-Free Resource Adjustment (Rider CFRA). As originally approved by the ICC, Rider CFRA provides for an annual reconciliation and true-up to actual costs incurred or credits received by ComEd to purchase CMCs, with any difference to be credited to or collected from ComEd’s retail customers in subsequent periods. The difference between the net payments to (or receivables from) ComEd ratepayers and the credits received by ComEd to purchase CMCs is recorded to Purchased power expense with an offset to the regulatory asset (or regulatory liability). On December 21, 2022, ComEd filed an amendment to Rider CFRA proposing that it recover costs or provide credits faster than the tariff allows, implement monthly reconciliations, and allow ComEd to adjust Rider CFRA rates based not only on anticipated differences but also past payments or credits, and implement monthly reconciliations beginning the June 2023 delivery period. The ICC approved the proposal on January 19, 2023. In addition, on March 24, 2023, ComEd submitted revisions to Rider CFRA which clarified the methodology for calculating interest to be included in the annual reconciliation associated with the June 2022 through May 2023 delivery year. The ICC approved the proposal on April 20, 2023. On February 2, 2024, ComEd filed a petition with the ICC to initiate the reconciliation proceeding for the costs incurred in connection with the procurement of CMCs during the delivery year beginning June 1, 2022 and extending through May 31, 2023. Beneficial Electrification Plan On March 23, 2023, the ICC issued its final order approving the beneficial electrification plan for ComEd. The ICC rejected ComEd’s request to treat a large portion of beneficial electrification costs as a regulatory asset and ordered ComEd to seek cost recovery through the multi-year rate plan filing for 2024 and 2025, and the final formula rate reconciliation docket for 2023, rather than through a separate charge. The order also authorized an overall annual budget of $77 million per year for the three-year plan period (2023 through 2025), with flexibility to roll forward unused funds to future years within the same plan period. On April 18, 2023, ComEd filed an application for rehearing in the beneficial electrification plan docket. The Chicago Transit Authority and City of Chicago, jointly, and the Office of the Illinois Attorney General (ILAG) also filed applications for rehearing. On April 27, 2023, ICC staff filed a motion for clarification, seeking clarification from the ICC on the precise budget described in the final order. On May 8, 2023, the ICC denied all applications for rehearing, and entered an amendatory order regarding the annual beneficial electrification plan budgets. ComEd has been directed to use good faith efforts to spend $77 million annually. ComEd subsequently filed its compliance filing in May 2023, detailing project related spending, clarifying the procedure that will be used to seek stakeholder feedback related to beneficial electrification pilot programs, and including the timeline for tariff changes required to implement the programs. ComEd and the ILAG both filed appeals of the ICC’s interim order that addressed the permissible scope of utility beneficial electrification programs outside of transportation and the rate impact cap. The ILAG also filed an appeal seeking reversal of portions of the ICC’s final decision. The final order partly mooted ComEd’s appeal of the interim order and ComEd has decided not to pursue the other issues. As such, ComEd moved to voluntarily dismiss its appeal and the appellate court granted that request. The ILAG consolidated their appeals and filed their opening brief on April 16, 2024. Any ruling on the appeals, even a negative ruling removing programs from the BE Plan or lowering the overall budget of the BE Plan, will only impact forward-looking costs. Energy Efficiency CEJA extends ComEd’s current cumulative annual energy efficiency MWh savings goals through 2040, adds expanded electrification measures to those goals, increases low-income commitments and adds a new performance adjustment to the energy efficiency formula rate. ComEd expects its annual spend to increase in 2023 through 2040 to achieve these energy efficiency MWh savings goals, which will be deferred as a separate regulatory asset that will be recovered through the energy efficiency formula rate over the weighted average useful life, as approved by the ICC, of the related energy efficiency measures. New Jersey Regulatory Matters Termination of Energy Procurement Provisions of PPAs (Exelon, PHI, and ACE). On December 22, 2021, ACE filed with the NJBPU a petition to terminate the provisions in the PPAs to purchase electricity from two coal-powered generation facilities located in the state of New Jersey. The petition was approved by the NJBPU on March 23, 2022. Upon closing of the transaction on March 31, 2022, ACE recognized a liability of $203 million for the contract termination fee, which is to be paid by the end of 2024, and recognized a corresponding regulatory asset of $203 million. As of March 31, 2024, the $31 million liability for the contract termination fee is included in Other current liabilities in Exelon's Consolidated Balance Sheet and PPA termination obligation in PHI's and ACE's Consolidated Balance Sheets. For the three months ended March 31, 2024 and 2023, ACE has respectively paid $18 million and $19 million of the liability, which is recorded in Changes in Other assets and liabilities in Exelon's, PHI's, and ACE's Consolidated Statements of Cash Flows. Other Federal Regulatory Matters FERC Audit (Exelon and ComEd). The Utility Registrants are subject to periodic audits and investigations by FERC. FERC’s Division of Audits and Accounting initiated a nonpublic audit of ComEd in April 2021 evaluating ComEd’s compliance with (1) approved terms, rates and conditions of its federally regulated service; (2) accounting requirements of the Uniform System of Accounts; (3) reporting requirements of the FERC Form 1; and (4) the requirements for record retention. The audit period extends back to January 1, 2017. On July 27, 2023, FERC issued a final audit report which included, among other things, findings and recommendations related to ComEd's methodology regarding the allocation of certain overhead costs to capitalized construction costs under FERC regulations, including a suggestion that refunds may be due to customers for amounts collected in previous years. On August 28, 2023, ComEd filed a formal notice of the issues it will contest. On December 14, 2023, FERC appointed a settlement judge for the contested overhead allocation findings and set the matter for a trial-type hearing. That hearing process has been held in abeyance while a formal settlement process, which began in February 2024, takes place. Based on the preliminary findings and the ongoing settlement process, ComEd determined that a loss was probable and recorded its regulatory liability to reflect its best estimate of that loss. The final outcome and resolution of any contested audit issues as well as a reasonable estimate of potential future losses cannot be accurately estimated at this stage; however, the final resolution of these matters could result in recognition of future losses, above the amounts currently accrued, that could be material to the Exelon and ComEd financial statements. Regulatory Assets and Liabilities The Utility Registrants' regulatory assets and liabilities have not changed materially since December 31, 2023, unless noted below. See Note 3 — Regulatory Matters of the 2023 Form 10-K for additional information on the specific regulatory assets and liabilities. ComEd. Regulatory assets decreased $286 million primarily due to a decrease of $268 million in the CMC regulatory asset. PECO. Regulatory liabilities increased $17 million primarily due to an increase of $26 million in the Decommissioning the regulatory agreement units regulatory liability. BGE. Regulatory liabilities decreased $75 million primarily due to a decrease of $75 million in the Deferred income taxes regulatory liability. ACE. Regulatory assets increased $34 million primarily due to an increase of $13 million in the Under-recovered revenue decoupling regulatory asset, an increase of $8 million in the Energy efficiency and demand response programs regulatory asset, and an increase of $8 million in the Deferred storm costs regulatory asset. Capitalized Ratemaking Amounts Not Recognized The following table presents authorized amounts capitalized for ratemaking purposes related to earnings on shareholders' investment that are not recognized for financial reporting purposes in the Registrants' Consolidated Balance Sheets. These amounts will be recognized as revenues in the related Consolidated Statements of Operations and Comprehensive Income in the periods they are billable to the Utility Registrants' customers. PECO had no related amounts at March 31, 2024 and December 31, 2023. Exelon ComEd (a) BGE (b) PHI Pepco (c) DPL (c) ACE (d) March 31, 2024 $ 106 $ 36 $ 30 $ 40 $ 27 $ 1 $ 12 December 31, 2023 110 32 33 45 34 1 10 __________ (a) Reflects ComEd's unrecognized equity returns earned for ratemaking purposes on its energy efficiency and electric distribution formula rate regulatory assets. (b) BGE's amount capitalized for ratemaking purposes primarily relates to earnings on shareholders' investment on their AMI programs and on investments in rate base included in the multi-year plan reconciliations. (c) Pepco's and DPL's authorized amounts capitalized for ratemaking purposes relate to earnings on share

Revenue from Contracts with Cus

Revenue from Contracts with Customers (All Registrants)	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers (All Registrants)	Revenue from Contracts with Customers (All Registrants) The Registrants recognize revenue from contracts with customers to depict the transfer of goods or services to customers at an amount that the entities expect to be entitled to in exchange for those goods or services. The primary sources of revenue include regulated electric and gas tariff sales, distribution, and transmission services. See Note 4 — Revenue from Contracts with Customers of the 2023 Form 10-K for additional information regarding the primary sources of revenue for the Registrants. Contract Liabilities The Registrants record contract liabilities when consideration is received or due prior to the satisfaction of the performance obligations. The Registrants record contract liabilities in Other current liabilities and Other noncurrent deferred credits and other liabilities in their Consolidated Balance Sheets. For Pepco, DPL, and ACE these contract liabilities primarily relate to upfront consideration received in the third quarter of 2020 for a collaborative arrangement ("Agreement") with an unrelated owner and manager of communication infrastructure, as well as additional consideration received for the payment option amendment ("Amendment") executed during the fourth quarter of 2023, which is discussed in further detail within Note 4 — Revenue from Contracts with Customers of the 2023 Form 10-K. The contract liability balance attributable to the Agreement and the Amendment is being recognized as Electric operating revenues over a 35 year period and 31 year period, respectively. The following table provides a rollforward of the contract liabilities reflected in Exelon's, PHI's, Pepco's, DPL's, and ACE's Consolidated Balance Sheets for the three months ended March 31, 2024 and 2023. At March 31, 2024 and December 31, 2023, ComEd's, PECO's, and BGE's contract liabilities were immaterial. Exelon (a) PHI (a) Pepco (a) DPL ACE Balance at December 31, 2023 $ 133 $ 133 $ 107 $ 13 $ 13 Revenues recognized (2) (2) (2) — — Balance at March 31, 2024 $ 131 $ 131 $ 105 $ 13 $ 13 Exelon (a) PHI (a) Pepco (a) DPL ACE Balance at December 31, 2022 $ 101 $ 101 $ 81 $ 10 $ 10 Revenues recognized (1) (1) (1) — — Balance at March 31, 2023 $ 100 $ 100 $ 80 $ 10 $ 10 __________ (a) Revenues recognized in the three months ended March 31, 2024 and 2023, were included in the contract liabilities at December 31, 2023 and 2022, respectively. 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, 2024. 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 the Utility Registrants' gas and electric tariff sales contracts and transmission revenue contracts as they generally have an original expected duration of one year or less and, therefore, do not contain any future, unsatisfied performance obligations to be included in this disclosure. Year Exelon PHI Pepco DPL ACE 2024 $ 4 $ 4 $ 4 $ — $ — 2025 7 7 5 1 1 2026 6 6 5 1 — 2027 5 5 5 — — 2028 and thereafter 109 109 86 11 12 Total $ 131 $ 131 $ 105 $ 13 $ 13 Revenue Disaggregation The Registrants disaggregate 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 the Registrants' revenue disaggregation.

Segment Information (All Regist

Segment Information (All Registrants)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Segment Information (All Registrants)	Segment Information (All Registrants) Operating segments for each of the Registrants are determined based on information used by the CODMs in deciding how to evaluate performance and allocate resources at each of the Registrants. Exelon has six reportable segments, which include ComEd, PECO, BGE, and PHI's three reportable segments consisting of Pepco, DPL, and ACE. ComEd, PECO, BGE, Pepco, DPL, and ACE each represent a single reportable segment, and as such, no separate segment information is provided for these Registrants. Exelon, ComEd, PECO, BGE, Pepco, DPL, and ACE's CODMs evaluate the performance of and allocate resources to the segments based on net income. An analysis and reconciliation of the Registrants’ reportable segment information to the respective information in the consolidated financial statements for the three months ended March 31, 2024 and 2023 is as follows: ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2024 Electric revenues $ 2,095 $ 782 $ 881 $ 1,532 $ — $ (6) $ 5,284 Natural gas revenues — 272 416 72 — (1) 759 Shared service and other revenues — — — 2 459 (461) — Total operating revenues $ 2,095 $ 1,054 $ 1,297 $ 1,606 $ 459 $ (468) $ 6,043 2023 Electric revenues $ 1,667 $ 795 $ 814 $ 1,436 $ — $ (5) $ 4,707 Natural gas revenues — 317 443 97 — (1) 856 Shared service and other revenues — — — 3 437 (440) — Total operating revenues $ 1,667 $ 1,112 $ 1,257 $ 1,536 $ 437 $ (446) $ 5,563 Intersegment revenues (c) : 2024 $ 2 $ 2 $ 2 $ 3 $ 457 $ (466) $ — 2023 3 2 3 3 434 (445) — Depreciation and amortization: 2024 $ 362 $ 104 $ 150 $ 246 $ 17 $ — $ 879 2023 338 98 167 241 16 — 860 Operating expenses: 2024 $ 1,781 $ 851 $ 967 $ 1,335 $ 472 $ (475) $ 4,931 2023 1,256 902 964 1,297 485 (447) 4,457 Interest expense, net: 2024 $ 122 $ 55 $ 50 $ 90 $ 151 $ — $ 468 2023 117 48 44 76 127 — 412 Income taxes: 2024 $ 19 $ 10 $ 24 $ 40 $ (30) $ — $ 63 2023 71 4 52 34 (27) — 134 Net income (loss): 2024 $ 193 $ 149 $ 264 $ 168 $ (116) $ — $ 658 2023 241 166 200 155 (93) — 669 Capital expenditures: 2024 $ 594 $ 361 $ 324 $ 453 $ 35 $ — $ 1,767 2023 617 335 350 561 18 — 1,881 Total assets: March 31, 2024 $ 43,132 $ 16,116 $ 14,444 $ 27,535 $ 6,376 $ (4,392) $ 103,211 December 31, 2023 42,827 15,595 14,184 26,903 6,374 (4,337) 101,546 __________ (a) Other primarily includes Exelon’s corporate operations, shared service entities, and other financing and investment activities. (b) Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in Taxes other than income taxes in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 14 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 15 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2024 Electric revenues $ 759 $ 419 $ 358 $ — $ (4) $ 1,532 Natural gas revenues — 72 — — — 72 Shared service and other revenues — — — 109 (107) 2 Total operating revenues $ 759 $ 491 $ 358 $ 109 $ (111) $ 1,606 2023 Electric revenues $ 710 $ 377 $ 353 $ — $ (4) $ 1,436 Natural gas revenues — 97 — — — 97 Shared service and other revenues — — — 102 (99) 3 Total operating revenues $ 710 $ 474 $ 353 $ 102 $ (103) $ 1,536 Intersegment revenues (c) : 2024 $ 2 $ 2 $ 1 $ 109 $ (111) $ 3 2023 1 2 1 102 (103) 3 Depreciation and amortization: 2024 $ 107 $ 61 $ 74 $ 4 $ — $ 246 2023 108 60 67 6 — 241 Operating expenses: 2024 $ 640 $ 391 $ 303 $ 111 $ (110) $ 1,335 2023 610 388 298 104 (103) 1,297 Interest expense, net: 2024 $ 45 $ 22 $ 20 $ 3 $ — $ 90 2023 39 17 16 4 — 76 Income taxes: 2024 $ 14 $ 17 $ 11 $ (2) $ — $ 40 2023 12 12 11 (1) — 34 Net income (loss): 2024 $ 75 $ 66 $ 29 $ (2) $ — $ 168 2023 65 60 33 (3) — 155 Capital expenditures: 2024 $ 229 $ 134 $ 89 $ 1 $ — $ 453 2023 264 134 161 2 — 561 Total assets: March 31, 2024 $ 11,585 $ 6,291 $ 5,253 $ 4,718 $ (312) $ 27,535 December 31, 2023 11,194 5,966 5,157 4,627 (41) 26,903 __________ (a) Other primarily includes PHI’s corporate operations, shared service entities, and other financing and investment activities. (b) Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in Taxes other than income taxes in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 14 — Supplemental Financial Information for additional information on total utility taxes. (c) Includes intersegment revenues with ComEd, PECO, and BGE, which are eliminated at Exelon. Electric and Gas Revenue by Customer Class (Utility Registrants): The following tables disaggregate the Registrants' revenues 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. For the Utility Registrants, the disaggregation of revenues reflects the two primary utility services of electric sales and natural gas sales (where applicable), with further disaggregation of these tariff sales provided by major customer groups. Exelon’s disaggregated revenues are consistent with the Utility Registrants, but exclude any intercompany revenues. Three Months Ended March 31, 2024 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 918 $ 520 $ 534 $ 775 $ 345 $ 256 $ 174 Small commercial & industrial 594 126 90 158 46 62 50 Large commercial & industrial 320 57 132 340 262 29 49 Public authorities & electric railroads 17 7 7 20 11 4 5 Other (a) 227 74 93 192 64 63 67 Total electric revenues (b) $ 2,076 $ 784 $ 856 $ 1,485 $ 728 $ 414 $ 345 Natural gas revenues Residential $ — $ 193 $ 271 $ 46 $ — $ 46 $ — Small commercial & industrial — 64 47 17 — 17 — Large commercial & industrial — — 72 2 — 2 — Transportation — 8 — 5 — 5 — Other (c) — 7 5 2 — 2 — Total natural gas revenues (d) $ — $ 272 $ 395 $ 72 $ — $ 72 $ — Total revenues from contracts with customers $ 2,076 $ 1,056 $ 1,251 $ 1,557 $ 728 $ 486 $ 345 Other revenues Revenues from alternative revenue programs $ 19 $ (2) $ 43 $ 46 $ 29 $ 4 $ 13 Other electric revenues (e) — — 2 3 2 1 — Other natural gas revenues (e) — — 1 — — — — Total other revenues $ 19 $ (2) $ 46 $ 49 $ 31 $ 5 $ 13 Total revenues for reportable segments $ 2,095 $ 1,054 $ 1,297 $ 1,606 $ 759 $ 491 $ 358 Three Months Ended March 31, 2023 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 836 $ 519 $ 434 $ 639 $ 283 $ 210 $ 146 Small commercial & industrial 361 135 92 160 39 62 59 Large commercial & industrial 84 65 149 378 282 33 63 Public authorities & electric railroads 10 8 7 17 8 4 5 Other (a) 217 68 96 176 56 58 63 Total electric revenues (b) $ 1,508 $ 795 $ 778 $ 1,370 $ 668 $ 367 $ 336 Natural gas revenues Residential $ — $ 223 $ 278 $ 60 $ — $ 60 $ — Small commercial & industrial — 75 41 26 — 26 — Large commercial & industrial — 1 70 1 — 1 — Transportation — 8 — 4 — 4 — Other (c) — 9 19 6 — 6 — Total natural gas revenues (d) $ — $ 316 $ 408 $ 97 $ — $ 97 $ — Total revenues from contracts with customers $ 1,508 $ 1,111 $ 1,186 $ 1,467 $ 668 $ 464 $ 336 Other revenues Revenues from alternative revenue programs $ 153 $ (4) $ 65 $ 65 $ 39 $ 9 $ 17 Other electric revenues (e) 6 4 4 4 3 1 — Other natural gas revenues (e) — 1 2 — — — — Total other revenues $ 159 $ 1 $ 71 $ 69 $ 42 $ 10 $ 17 Total revenues for reportable segments $ 1,667 $ 1,112 $ 1,257 $ 1,536 $ 710 $ 474 $ 353 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2024 and 2023 respectively of: • $2 million, $3 million at ComEd • $2 million, $1 million at PECO • $1 million, $2 million at BGE • $3 million, $3 million at PHI • $2 million, $1 million at Pepco • $2 million, $2 million at DPL • $1 million, $1 million at ACE (c) Includes revenues from off-system natural gas sales. (d) Includes operating revenues from affiliates in 2024 and 2023 respectively of: • less than $1 million, $1 million at PECO • $1 million, $1 million at BGE (e) Includes late payment charge revenues.

Accounts Receivable (All Regist

Accounts Receivable (All Registrants)	3 Months Ended
	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Accounts Receivable (All Registrants)	Accounts Receivable (All Registrants) Allowance for Credit Losses on Accounts Receivable The following tables present the rollforward of Allowance for Credit Losses on Customer Accounts Receivable. Three Months Ended March 31, 2024 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at December 31, 2023 $ 317 $ 69 $ 95 $ 46 $ 107 $ 52 $ 19 $ 36 Plus: Current period provision for expected credit losses (a)(b)(c) 79 22 23 15 19 12 3 4 Less: Write-offs (d) , net of recoveries (e) 50 9 11 9 21 12 5 4 Balance at March 31, 2024 $ 346 $ 82 $ 107 $ 52 $ 105 $ 52 $ 17 $ 36 Three Months Ended March 31, 2023 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at December 31, 2022 $ 327 $ 59 $ 105 $ 54 $ 109 $ 47 $ 21 $ 41 Plus: Current period provision for expected credit losses 108 22 39 30 17 9 7 1 Less: Write-offs, net of recoveries 46 7 14 11 14 7 2 5 Balance at March 31, 2023 $ 389 $ 74 $ 130 $ 73 $ 112 $ 49 $ 26 $ 37 _________ (a) For PECO, the change in current period provision for expected credit losses is primarily a result of decreased receivable balances. (b) For BGE and DPL, the change in the current period provision for expected credit losses is primarily a result of changes in customer risk profile. (c) For ACE, the change in current period provision for expected credit losses is primarily a result of increased receivable balances. (d) For Pepco and DPL, the change in write-offs is primarily attributable to unfavorable customer payment behavior. (e) Recoveries were not material to the Registrants. The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable. Three Months Ended March 31, 2024 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at December 31, 2023 $ 82 $ 17 $ 8 $ 7 $ 50 $ 28 $ 8 $ 14 Plus: Current period provision for expected credit losses 18 3 5 2 8 7 — 1 Less: Write-offs, net of recoveries (a) 4 1 — 2 1 — — 1 Balance at March 31, 2024 $ 96 $ 19 $ 13 $ 7 $ 57 $ 35 $ 8 $ 14 Three Months Ended March 31, 2023 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at December 31, 2022 $ 82 $ 17 $ 9 $ 10 $ 46 $ 25 $ 7 $ 14 Plus: Current period provision for expected credit losses 14 2 3 4 5 3 1 1 Less: Write-offs, net of recoveries 5 1 1 2 1 — — 1 Balance at March 31, 2023 $ 91 $ 18 $ 11 $ 12 $ 50 $ 28 $ 8 $ 14 _________ (a) Recoveries were not material to the Registrants. Unbilled Customer Revenue The following table provides additional information about unbilled customer revenues recorded in the Registrants' Consolidated Balance Sheets at March 31, 2024 and December 31, 2023. Unbilled customer revenues (a) Exelon ComEd PECO BGE PHI Pepco DPL ACE March 31, 2024 $ 849 $ 344 $ 138 $ 171 $ 196 $ 96 $ 53 $ 47 December 31, 2023 991 351 185 208 247 109 64 74 __________ (a) Unbilled customer revenues are classified in Customer accounts receivable, net in the Registrants' Consolidated Balance Sheets. Other Purchases of Customer and Other Accounts Receivables The Utility Registrants are required, under separate legislation and regulations in Illinois, Pennsylvania, Maryland, District of Columbia, Delaware, and New Jersey, to purchase certain receivables from alternative retail electric and, as applicable, natural gas suppliers that participate in the utilities' consolidated billing. The following table presents the total receivables purchased. Total receivables purchased Exelon ComEd PECO BGE PHI Pepco DPL ACE Three months ended March 31, 2024 $ 1,060 $ 235 $ 297 $ 219 $ 309 $ 194 $ 60 $ 55 Three months ended March 31, 2023 1,108 240 309 245 314 210 56 48

Income Taxes (All Registrants)

Income Taxes (All Registrants)	3 Months Ended
	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes (All Registrants)	Income Taxes (All Registrants) 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, 2024 (a) Exelon ComEd (b) PECO (c) BGE (b) PHI Pepco DPL ACE U.S. Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 6.4 7.8 (0.6) 6.3 6.4 6.2 6.2 7.1 Plant basis differences (3.8) (0.9) (12.2) (1.2) (0.9) (1.3) (1.1) 0.1 Excess deferred tax amortization (14.7) (18.9) (2.3) (17.5) (6.8) (9.9) (5.4) (1.3) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — — (0.1) — (0.1) (0.1) Tax credits (0.4) (0.3) — (0.4) (0.3) (0.3) (0.3) (0.3) Other 0.3 0.4 0.4 0.1 (0.1) — 0.2 1.0 Effective income tax rate 8.7 % 9.0 % 6.3 % 8.3 % 19.2 % 15.7 % 20.5 % 27.5 % Three Months Ended March 31, 2023 (a) Exelon ComEd PECO (c) BGE PHI Pepco DPL ACE U.S. Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 6.0 7.9 (1.4) 6.4 6.0 5.4 6.3 6.9 Plant basis differences (4.0) (0.3) (15.2) (0.7) (1.8) (2.5) (1.0) (0.9) Excess deferred tax amortization (6.3) (5.7) (2.4) (5.4) (7.0) (8.4) (8.8) (2.0) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.1) (0.1) Tax credits (0.5) (0.3) — (0.5) (0.4) (0.4) (0.4) (0.3) Other 0.6 0.3 0.4 (0.1) 0.3 0.5 (0.3) 0.4 Effective income tax rate 16.7 % 22.8 % 2.4 % 20.6 % 18.0 % 15.6 % 16.7 % 25.0 % __________ (a) Positive percentages represent income tax expense. Negative percentages represent income tax benefit. (b) For ComEd, the lower effective tax rate is primarily due to CEJA which resulted in the acceleration of certain income tax benefits. For BGE, the lower effective tax rate is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. (c) For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions. Unrecognized Tax Benefits Exelon, PHI and ACE have the following unrecognized tax benefits at March 31, 2024 and December 31, 2023. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material. Exelon (a) PHI ACE March 31, 2024 $ 95 $ 51 $ 15 December 31, 2023 94 51 15 __________ (a) At March 31, 2024 and December 31, 2023, Exelon's unrecognized tax benefits is inclusive of $31 million related to Constellation's share of unrecognized tax benefits for periods prior to the separation. Exelon reflected an offsetting receivable of $31 million in Other deferred debits and other assets in the Consolidated Balance Sheet for these amounts. Other Tax Matters Tax Matters Agreement (Exelon) In connection with the separation, Exelon entered into a TMA with Constellation. The TMA governs the respective rights, responsibilities, and obligations between Exelon and Constellation after the separation with respect to tax liabilities, refunds and attributes for open tax years that Constellation was part of Exelon’s consolidated group for U.S. federal, state, and local tax purposes. Indemnification for Taxes. As a former subsidiary of Exelon, Constellation has joint and several liability with Exelon to the IRS and certain state jurisdictions relating to the taxable periods prior to the separation. The TMA specifies that Constellation is liable for their share of taxes required to be paid by Exelon with respect to taxable periods prior to the separation to the extent Constellation would have been responsible for such taxes under the existing Exelon tax sharing agreement. Tax Refunds. The TMA specifies that Constellation is entitled to their share of any future tax refunds claimed by Exelon with respect to taxable periods prior to the separation to the extent that Constellation would have received such tax refunds under the existing Exelon tax sharing agreement. Tax Attributes . At the date of separation certain tax attributes, primarily pre-closing tax credit carryforwards, that were generated by Constellation were required by law to be allocated to Exelon. The TMA provides that Exelon will reimburse Constellation when those allocated tax credit carryforwards are utilized. As of March 31, 2024, Exelon recorded a payable of $183 million and $331 million in Other current liabilities and Other deferred credits and other liabilities, respectively, in the Consolidated Balance Sheet for tax attribute carryforwards that are expected to be utilized and reimbursed to Constellation. Corporate Alternative Minimum Tax (All Registrants) On August 16, 2022, the IRA was signed into law and implements a new corporate alternative minimum tax (CAMT) that imposes a 15.0% tax on modified GAAP net income. Corporations are entitled to a tax credit (minimum tax credit) to the extent the CAMT liability exceeds the regular tax liability. This amount can be carried forward indefinitely and used in future years when regular tax exceeds the CAMT. Beginning in 2023, based on the existing statue, Exelon and each of the Utility Registrants will be subject to and will report the CAMT on a separate Registrant basis in the Consolidated Statements of Operations and Comprehensive Income and the Consolidated Balance Sheets. The deferred tax asset related to the minimum tax credit carryforward will be realized to the extent Exelon’s consolidated deferred tax liabilities exceed the minimum tax credit carryforward. Exelon’s deferred tax liabilities are expected to exceed the minimum tax credit carryforward for the foreseeable future and thus no valuation allowance is required. Exelon is continuing to assess the financial statement impacts of the IRA and will update estimates based on future guidance issued by the U.S. Treasury.

Retirement Benefits (All Regist

Retirement Benefits (All Registrants)	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Retirement Benefits (All Registrants)	Retirement Benefits (All Registrants) Defined Benefit Pension and OPEB The majority of the 2024 pension benefit cost for the Exelon-sponsored plans is calculated using an expected long-term rate of return on plan assets of 7.00% and a discount rate of 5.19%. The majority of the 2024 OPEB cost is calculated using an expected long-term rate of return on plan assets of 6.50% for funded plans and a discount rate of 5.17%. During the first quarter of 2024, Exelon received an updated valuation of its pension and OPEB to reflect actual census data as of January 1, 2024. This valuation resulted in an increase to the pension obligation of $98 million and a decrease to the OPEB obligation of $1 million. Additionally, AOCI increased by $25 million (after-tax) and regulatory assets and liabilities increased by $66 million and $2 million, respectively. A portion of the net periodic benefit cost for all plans is capitalized within the Consolidated Balance Sheets. The following table presents the components of Exelon's net periodic benefit costs, prior to capitalization, for the three months ended March 31, 2024 and 2023. Pension Benefits OPEB Three Months Ended March 31, Three Months Ended March 31, 2024 2023 2024 2023 Components of net periodic benefit cost Service cost $ 42 $ 39 $ 7 $ 6 Interest cost 141 145 24 25 Expected return on assets (184) (189) (21) (21) Amortization of: Prior service cost (credit) 1 1 (2) (2) Actuarial loss 53 41 — — Net periodic benefit cost $ 53 $ 37 $ 8 $ 8 The amounts below represent the Registrants' allocated pension and OPEB costs. For Exelon, the service cost component is included in Operating and maintenance expense and Property, plant, and equipment, net while the non-service cost components are included in Other, net and Regulatory assets. For the Utility Registrants, which apply multi-employer accounting, the service cost and non-service cost components are included in Operating and maintenance expense and Property, plant, and equipment, net in their consolidated financial statements. Three Months Ended March 31, Pension and OPEB Costs (Benefit) 2024 2023 Exelon $ 61 $ 45 ComEd 17 6 PECO — (3) BGE 15 14 PHI 23 24 Pepco 9 8 DPL 4 4 ACE 3 4 Defined Contribution Savings Plan The Registrants participate in a 401(k) defined contribution savings plan that is sponsored by Exelon. The plan is qualified under applicable sections of the IRC and allows employees to contribute a portion of their pre-tax and/or after-tax income in accordance with specified guidelines. All Registrants match a percentage of the employee contributions up to certain limits. The following table presents the employer contributions and employer matching contributions to the savings plan for the three months ended March 31, 2024 and 2023. Three Months Ended March 31, Savings Plan Employer Contributions 2024 2023 Exelon $ 22 $ 21 ComEd 10 9 PECO 3 3 BGE 3 2 PHI 2 3 Pepco 1 1 DPL 1 1 ACE — —

Derivative Financial Instrument

Derivative Financial Instruments (All Registrants)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments (All Registrants)	Derivative Financial Instruments (All Registrants) The Registrants use derivative instruments to manage commodity price risk and interest rate risk related to ongoing business operations. The Registrants do not execute derivatives for speculative or proprietary trading purposes. 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. At ComEd, derivative economic hedges related to commodities are recorded at fair value and offset by a corresponding regulatory asset or liability. At Exelon, derivative economic hedges related to interest rates are recorded at fair value and offsets are recorded to Electric operating revenues or Interest expense based on the activity the transaction is economically hedging. 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 consumed. At Exelon, derivative hedges that qualify and are designated as cash flow hedges are recorded at fair value and offsets are recorded to AOCI. ComEd’s use of cash collateral is generally unrestricted unless ComEd is downgraded below investment grade. Cash collateral held by PECO, BGE, Pepco, DPL, and ACE must be deposited in an unaffiliated major U.S. commercial bank or foreign bank with a U.S. branch office that meets certain qualifications. Commodity Price Risk The Utility Registrants employ established policies and procedures to manage their risks associated with market fluctuations in commodity prices by entering into physical and financial derivative contracts, which are either determined to be non-derivative or classified as economic hedges. The Utility Registrants procure electric and natural gas supply through a competitive procurement process approved by each of the respective state utility commissions. The Utility Registrants’ hedging programs are intended to reduce exposure to energy and natural gas price volatility and have no direct earnings impact as the costs are fully recovered from customers through regulatory-approved recovery mechanisms. The following table provides a summary of the Utility Registrants’ primary derivative hedging instruments, listed by commodity and accounting treatment. Registrant Commodity Accounting Treatment Hedging Instrument ComEd Electricity NPNS Fixed price contracts based on all requirements in the IPA procurement plans. Electricity Changes in fair value of economic hedge recorded to an offsetting regulatory asset or liability (a) 20-year floating-to-fixed energy swap contracts beginning June 2012 based on the renewable energy resource procurement requirements in the Illinois Settlement Legislation of approximately 1.3 million MWhs per year. PECO Electricity NPNS Fixed price contracts for default supply requirements through full requirements contracts. Gas NPNS Fixed price contracts to cover about 10% of planned natural gas purchases in support of projected firm sales. BGE Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. Gas NPNS Fixed price contracts for between 10-20% of forecasted system supply requirements for flowing (i.e., non-storage) gas for the November through March period. Pepco Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. DPL Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. Gas NPNS Fixed and index priced contracts through full requirements contracts. Gas Changes in fair value of economic hedge recorded to an offsetting regulatory asset or liability (b) Exchange traded future contracts for up to 50% of estimated monthly purchase requirements each month, including purchases for storage injections. ACE Electricity NPNS Fixed price contracts for all BGS requirements through full requirements contracts. __________ (a) See Note 3 — Regulatory Matters of the 2023 Form 10-K for additional information. (b) The fair value of the DPL economic hedge is not material at March 31, 2024 and December 31, 2023. The fair value of derivative economic hedges is presented in Other current assets and current and noncurrent Mark-to-market derivative liabilities in Exelon's and ComEd's Consolidated Balance Sheets. Interest Rate and Other Risk (Exelon) Exelon Corporate uses a combination of fixed-rate and variable-rate debt to manage interest rate exposure. Exelon Corporate may utilize interest rate derivatives to lock in rate levels in anticipation of future financings, which are typically designated as cash flow hedges. In addition, Exelon Corporate utilized interest rate swaps to manage interest rate exposure and manage potential fluctuations in Electric operating revenues at the corporate level in consolidation. These interest rate swaps are accounted for as economic hedges. A hypothetical 50 basis point change in the interest rates associated with Exelon's interest rate swaps as of March 31, 2024 would result in an immaterial impact to Exelon's Consolidated Net Income. Below is a summary of the interest rate hedge balances at March 31, 2024 and December 31, 2023 . March 31, 2024 Derivatives Designated Economic Hedges Total Other deferred debits (noncurrent assets) $ 2 $ — $ 2 Total derivative assets 2 — 2 Mark-to-market derivative liabilities (noncurrent liabilities) (1) — (1) Total mark-to-market derivative liabilities (1) — (1) Total mark-to-market derivative net assets $ 1 $ — $ 1 December 31, 2023 Derivatives Designated Economic Hedges Total Other current assets $ 11 $ 1 $ 12 Total derivative assets 11 1 12 Mark-to-market derivative liabilities (current liabilities) (24) (22) (46) Total mark-to-market derivative liabilities (24) (22) (46) Total mark-to-market derivative net assets $ (13) $ (21) $ (34) Cash Flow Hedges (Interest Rate Risk) For derivative instruments that qualify and are designated as cash flow hedges, the changes in fair value each period are initially recorded in AOCI and reclassified into earnings when the underlying transaction affects earnings. In February 2024, Exelon terminated the previously issued floating-to-fixed swaps with a total notional of $1.3 billion upon issuance of $1.7 billion of debt. See Note 9 – Debt and Credit Agreements for additional information on the debt issuance. Prior to the termination, the 2024 year-to-date AOCI derivative gain was $33 million (net of tax). The settlements resulted in a cash receipt of $30 million. The accumulated AOCI gain of $23 million (net of tax) is being amortized into Interest expense in Exelon's Consolidated Statement of Operations and Comprehensive Income over the 5-year and 10-year terms of the swaps. During the first quarter of 2024, Exelon Corporate entered into $145 million notional of 5-year maturity floating-to-fixed swaps and $145 million notional of 10-year maturity floating-to-fixed swaps, for a total notional of $290 million designated as cash flow hedges. The following table provides the notional amounts outstanding held by Exelon at March 31, 2024 and December 31, 2023. March 31, 2024 December 31, 2023 5-year maturity floating-to-fixed swaps $ 145 $ 655 10-year maturity floating-to-fixed swaps 145 655 Total $ 290 $ 1,310 The related AOCI derivative gains for the three months ended March 31, 2024 and 2023 were immaterial, respectively. See Note 13 – Changes in Accumulated Other Comprehensive Income (Loss) for additional information. Economic Hedges (Interest Rate and Other Risk) Exelon Corporate executes derivative instruments to mitigate exposure to fluctuations in interest rates but for which the fair value or cash flow hedge elections were not made. For derivatives intended to serve as economic hedges, fair value is recorded on the balance sheet and changes in fair value each period are recognized in earnings or as a regulatory asset or liability, if regulatory requirements are met, each period. Exelon Corporate entered into floating-to-fixed interest rate cap swaps to manage a portion of interest rate exposure in connection with existing borrowings. As of December 31, 2023, Exelon held $1,000 million notional of floating-to-fixed interest rate cap swaps, which matured in March 2024. Exelon received payments on the interest rate cap when the floating rate exceeded the fixed rate. Settlements received are immaterial as of March 31, 2024. Additionally, to manage potential fluctuations in Electric operating revenues related to ComEd's distribution formula rate, Exelon Corporate entered into a total $4,875 million of notional of 30-year constant maturity treasury interest rate (Corporate 30-year treasury) swaps from 2022 through 2023. The Corporate 30-year treasury swaps matured on December 31, 2023 and Exelon recorded a Mark-to-market liability of $22 million for the final settlement amount, which was paid in January 2024. Exelon Corporate recognized the following net pre-tax mark-to-market (losses) which are also recognized in Net fair value changes related to derivatives in Exelon's Consolidated Statements of Cash Flows. Three Months Ended March 31, 2024 Three Months Ended March 31, 2023 Income Statement Location Gain (Loss) Gain (Loss) Electric operating revenues $ — $ 1 Interest expense — (1) Total $ — $ — Credit Risk The Registrants 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 at the reporting date. The Utility Registrants have contracts to procure electric and natural gas supply that provide suppliers with a certain amount of unsecured credit. If the exposure on the supply contract exceeds the amount of unsecured credit, the suppliers may be required to post collateral. The net credit exposure is mitigated primarily by the ability to recover procurement costs through customer rates. The amount of cash collateral received from external counterparties remained relatively consistent as of March 31, 2024 due to stable energy prices. The following table reflects the Registrants' cash collateral held from external counterparties, which is recorded in Other current liabilities on their respective Consolidated Balance Sheets, as of March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Exelon $ 156 $ 148 ComEd 154 146 PECO (a) — — BGE 1 1 PHI 1 1 Pepco (b) — 1 DPL 1 — ACE 1 — __________ (a) PECO had less than one million in cash collateral held with external parties at March 31, 2024 and December 31, 2023. (b) Pepco had less than one million in cash collateral held with external parties at March 31, 2024.

Debt and Credit Agreements (All

Debt and Credit Agreements (All Registrants)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Debt and Credit Agreements (All Registrants)	Debt and Credit Agreements (All Registrants) Short-Term Borrowings Exelon Corporate, ComEd, and BGE meet their short-term liquidity requirements primarily through the issuance of commercial paper. PECO meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings from the Exelon intercompany money pool. Pepco, DPL, and ACE meet their short-term liquidity requirements primarily through the issuance of commercial paper and borrowings from the PHI intercompany money pool. PHI Corporate meets its short-term liquidity requirements primarily through the issuance of short-term notes and borrowings from the Exelon intercompany money pool. The Registrants may use their respective credit facilities for general corporate purposes, including meeting short-term funding requirements and the issuance of letters of credit. Commercial Paper The following table reflects the Registrants' commercial paper programs supported by the revolving credit agreements at March 31, 2024 and December 31, 2023. Outstanding Commercial Average Interest Rate on Commercial Paper Issuer March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Exelon (a) $ 1,307 $ 1,624 5.53 % 5.58 % ComEd $ 330 $ 202 5.43 % 5.53 % PECO $ — $ 165 — % 5.57 % BGE $ 406 $ 336 5.57 % 5.59 % PHI (b) $ — $ 394 — % 5.60 % Pepco $ — $ 132 — % 5.59 % DPL $ — $ 63 — % 5.60 % ACE $ — $ 199 — % 5.60 % __________ (a) Exelon Corporate had $571 million and $527 million in outstanding commercial paper borrowings at March 31, 2024 and December 31, 2023, respectively. (b) Represents the consolidated amounts of Pepco, DPL, and ACE. Revolving Credit Agreements Exelon Corporate and the Utility Registrants each have a 5-year revolving credit facility. The following table reflects the credit agreements: Borrower Aggregate Bank Commitment Interest Rate Exelon Corporate $ 900 SOFR plus 1.275 % ComEd $ 1,000 SOFR plus 1.000 % PECO $ 600 SOFR plus 0.900 % BGE $ 600 SOFR plus 0.900 % Pepco $ 300 SOFR plus 1.075 % DPL $ 300 SOFR plus 1.000 % ACE $ 300 SOFR plus 1.000 % Exelon Corporate and the Utility Registrants had no outstanding amounts on the revolving credit facilities as of March 31, 2024. The Utility Registrants have credit facility agreements, arranged at minority and community banks, which are solely utilized to issue letters of credit. The facility agreements have aggregate commitments of $40 million, $40 million, $15 million, $15 million, $15 million, and $15 million, at ComEd, PECO, BGE, Pepco, DPL, and ACE, respectively. These facilities expire on October 4, 2024. See Note 16 — Debt and Credit Agreements of the 2023 Form 10-K for additional information on the Registrants' credit facilities. Short-Term Loan Agreements On March 23, 2017, Exelon Corporate entered into a term loan agreement for $500 million. The loan agreement was renewed in the first quarter of 2024 and was bifurcated into two tranches of $350 million and $150 million on March 14, 2024. The agreements will expire on March 14, 2025. Pursuant to the loan agreements, loans made thereunder bear interest at a variable rate equal to SOFR plus 1.05% and all indebtedness thereunder is unsecured. The loan agreement is reflected in Exelon's Consolidated Balance Sheets within Short-term borrowings. On May 9, 2023, ComEd entered into a 364-day term loan agreement for $400 million with a variable rate equal to SOFR plus 1.00% and an expiration date of May 7, 2024. On May 1, 2024, ComEd entered into an agreement to extend the $400 million term loan through the expiration date of June 28, 2024. Interest on the extended loan will be based on a variable rate equal to SOFR plus 1.00%. The original proceeds from the loan were used to repay outstanding commercial paper obligations and for general corporate purposes. The loan agreement is reflected in Exelon's and ComEd's Consolidated Balance Sheets within Short-term borrowings. Long-Term Debt Issuance of Long-Term Debt During the three months ended March 31, 2024, the following long-term debt was issued: Company Type Interest Rate Maturity Amount Use of Proceeds Exelon Notes 5.15% March 15, 2029 $650 Repay Exelon SMBC Term Loan, outstanding commercial paper, and for general corporate purposes. Exelon Notes 5.45% March 15, 2034 $650 Repay Exelon SMBC Term Loan, outstanding commercial paper, and for general corporate purposes. Exelon Notes 5.60% March 15, 2053 $400 Repay Exelon SMBC Term Loan, outstanding commercial paper, and for general corporate purposes. Pepco First Mortgage Bonds 5.20% March 15, 2034 $375 Refinance existing indebtedness, refinance outstanding commercial paper obligations, and for general corporate purposes. Pepco First Mortgage Bonds 5.50% March 15, 2054 $300 Refinance existing indebtedness, refinance outstanding commercial paper obligations, and for general corporate purposes. DPL First Mortgage Bonds 5.24% March 20, 2034 $100 Repay existing indebtedness and for general corporate purposes. DPL First Mortgage Bonds 5.55% March 20, 2054 $75 Repay existing indebtedness and for general corporate purposes. ACE (a) First Mortgage Bonds 5.55% March 20, 2054 $75 Repay existing indebtedness and for general corporate purposes. __________ (a) On March 20, 2024, ACE entered into a purchase agreement of First Mortgage Bonds of $75 million and $100 million at 5.29% and 5.49% due on August 28, 2034 and August 28, 2039, respectively. The closing date of the issuance is expected to occur in August 2024. Debt Covenants As of March 31, 2024, the Registrants are in compliance with debt covenants.

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities (All Registrants)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities (All Registrants)	Fair Value of Financial Assets and Liabilities (All Registrants) Exelon measures and classifies 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 the Registrants 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. Exelon’s valuation techniques used to measure the fair value of the assets and liabilities shown in the tables below are in accordance with the policies discussed in Note 17 — Fair Value of Financial Assets and Liabilities of the 2023 Form 10-K. Fair Value of Financial Liabilities Recorded at Amortized Cost The following tables present the carrying amounts and fair values of the Registrants’ short-term liabilities, long-term debt, and trust preferred securities (long-term debt to financing trusts or junior subordinated debentures) as of March 31, 2024 and December 31, 2023. The Registrants have no financial liabilities measured using the NAV practical expedient. The carrying amounts of the Registrants’ short-term liabilities as presented in their Consolidated Balance Sheets are representative of their fair value (Level 2) because of the short-term nature of these instruments. March 31, 2024 December 31, 2023 Carrying Amount Fair Value Carrying Amount Fair Value Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Long-Term Debt, including amounts due within one year (a) Exelon $ 42,774 $ — $ 34,426 $ 3,613 $ 38,039 $ 41,095 $ — $ 33,804 $ 3,442 $ 37,246 ComEd 11,487 — 9,910 — 9,910 11,486 — 10,210 — 10,210 PECO 5,134 — 4,391 — 4,391 5,134 — 4,562 — 4,562 BGE 4,602 — 4,015 — 4,015 4,602 — 4,145 — 4,145 PHI 9,153 — 4,356 3,613 7,969 8,648 — 4,160 3,442 7,602 Pepco 4,359 — 2,549 1,570 4,119 4,096 — 2,311 1,600 3,911 DPL 2,254 — 668 1,274 1,942 2,080 — 694 1,134 1,828 ACE 1,909 — 929 768 1,697 1,833 — 939 708 1,647 Long-Term Debt to Financing Trusts Exelon $ 390 $ — $ — $ 392 $ 392 $ 390 $ — $ — $ 390 $ 390 ComEd 205 — — 209 209 205 — — 208 208 PECO 184 — — 183 183 184 — — 182 182 __________ (a) Includes unamortized debt issuance costs, unamortized debt discount and premium, net, purchase accounting fair value adjustments, and finance lease liabilities which are not fair valued. Refer to Note 16 — Debt and Credit Agreements of the 2023 Form 10-K for unamortized debt issuance costs, unamortized debt discount and premium, net, and purchase accounting fair value adjustments and Note 10 — Leases of the 2023 Form 10-K for finance lease liabilities. Recurring Fair Value Measurements The following tables present assets and liabilities measured and recorded at fair value in the Registrants' Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy at March 31, 2024 and December 31, 2023. Exelon and the Utility Registrants have immaterial and no financial assets or liabilities measured using the NAV practical expedient, respectively: Exelon At March 31, 2024 At December 31, 2023 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 883 $ — $ — $ 883 $ 618 $ — $ — $ 618 Rabbi trust investments Cash equivalents 68 — — 68 67 — — 67 Mutual funds 57 — — 57 53 — — 53 Fixed income — 7 — 7 — 7 — 7 Life insurance contracts — 65 43 108 — 61 43 104 Rabbi trust investments subtotal 125 72 43 240 120 68 43 231 Interest rate derivative assets Derivatives designated as hedging instruments — 2 — 2 — 11 — 11 Economic hedges — — — — — 1 — 1 Interest rate derivative assets subtotal — 2 — 2 — 12 — 12 Total assets 1,008 74 43 1,125 738 80 43 861 Liabilities Commodity derivative liabilities — — (108) (108) — — (133) (133) Interest rate derivative liabilities Derivatives designated as hedging instruments — (1) — (1) — (24) — (24) Economic hedges — — — — — (22) — (22) Interest rate derivative liabilities subtotal — (1) — (1) — (46) — (46) Deferred compensation obligation — (75) — (75) — (75) — (75) Total liabilities — (76) (108) (184) — (121) (133) (254) Total net assets (liabilities) $ 1,008 $ (2) $ (65) $ 941 $ 738 $ (41) $ (90) $ 607 __________ (a) Exelon excludes cash of $271 million and $334 million at March 31, 2024 and December 31, 2023, respectively, and restricted cash of $154 million and $149 million at March 31, 2024 and December 31, 2023, respectively, and includes long-term restricted cash of $99 million and $174 million at March 31, 2024 and December 31, 2023, respectively, which is reported in Other deferred debits and other assets in the Consolidated Balance Sheets. ComEd, PECO, and BGE ComEd PECO BGE At March 31, 2024 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 398 $ — $ — $ 398 $ 14 $ — $ — $ 14 $ — $ — $ — $ — Rabbi trust investments Mutual funds — — — — 10 — — 10 10 — — 10 Life insurance contracts — — — — — 19 — 19 — — — — Rabbi trust investments subtotal — — — — 10 19 — 29 10 — — 10 Total assets 398 — — 398 24 19 — 43 10 — — 10 Liabilities Commodity derivative liabilities (b) — — (108) (108) — — — — — — — — Deferred compensation obligation — (9) — (9) — (9) — (9) — (4) — (4) Total liabilities — (9) (108) (117) — (9) — (9) — (4) — (4) Total net assets (liabilities) $ 398 $ (9) $ (108) $ 281 $ 24 $ 10 $ — $ 34 $ 10 $ (4) $ — $ 6 ComEd PECO BGE At December 31, 2023 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 453 $ — $ — $ 453 $ 9 $ — $ — $ 9 $ — $ — $ — $ — Rabbi trust investments Mutual funds — — — — 9 — — 9 9 — — 9 Life insurance contracts — — — — — 18 — 18 — — — — Rabbi trust investments subtotal — — — — 9 18 — 27 9 — — 9 Total assets 453 — — 453 18 18 — 36 9 — — 9 Liabilities Commodity derivative liabilities (b) — — (133) (133) — — — — — — — — Deferred compensation obligation — (8) — (8) — (8) — (8) — (4) — (4) Total liabilities — (8) (133) (141) — (8) — (8) — (4) — (4) Total net assets (liabilities) $ 453 $ (8) $ (133) $ 312 $ 18 $ 10 $ — $ 28 $ 9 $ (4) $ — $ 5 __________ (a) ComEd excludes cash of $75 million and $86 million at March 31, 2024 and December 31, 2023, respectively, and restricted cash of $154 million and $147 million at March 31, 2024 and December 31, 2023, respectively. Additionally, ComEd includes long-term restricted cash of $99 million and $174 million at March 31, 2024 and December 31, 2023, respectively, which is reported in Other deferred debits and other assets in the Consolidated Balance Sheets. PECO excludes cash of $34 million and $42 million at March 31, 2024 and December 31, 2023, respectively. BGE excludes cash of $27 million and $47 million at March 31, 2024 and December 31, 2023, respectively, and restricted cash of zero and $1 million at March 31, 2024 and December 31, 2023, respectively. (b) The Level 3 balance consists of the current and noncurrent liability of $29 million and $79 million, respectively, at March 31, 2024 and $27 million and $106 million, respectively, at December 31, 2023 related to floating-to-fixed energy swap contracts with unaffiliated suppliers. PHI, Pepco, DPL, and ACE At March 31, 2024 At December 31, 2023 PHI Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 438 $ — $ — $ 438 $ 107 $ — $ — $ 107 Rabbi trust investments Cash equivalents 65 — — 65 64 — — 64 Mutual funds 9 — — 9 9 — — 9 Fixed income — 7 — 7 — 7 — 7 Life insurance contracts — 22 41 63 — 21 41 62 Rabbi trust investments subtotal 74 29 41 144 73 28 41 142 Total assets 512 29 41 582 180 28 41 249 Liabilities Deferred compensation obligation — (12) — (12) — (13) — (13) Total liabilities — (12) — (12) — (13) — (13) Total net assets $ 512 $ 17 $ 41 $ 570 $ 180 $ 15 $ 41 $ 236 Pepco DPL ACE At March 31, 2024 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 192 $ — $ — $ 192 $ 241 $ — $ — $ 241 $ — $ — $ — $ — Rabbi trust investments Cash equivalents 64 — — 64 — — — — — — — — Life insurance contracts — 22 41 63 — — — — — — — — Rabbi trust investments subtotal 64 22 41 127 — — — — — — — — Total assets 256 22 41 319 241 — — 241 — — — — Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 256 $ 21 $ 41 $ 318 $ 241 $ — $ — $ 241 $ — $ — $ — $ — Pepco DPL ACE At December 31, 2023 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 23 $ — $ — $ 23 $ 1 $ — $ — $ 1 $ — $ — $ — $ — Rabbi trust investments Cash equivalents 63 — — 63 — — — — — — — — Life insurance contracts — 21 41 62 — — — — — — — — Rabbi trust investments subtotal 63 21 41 125 — — — — — — — — Total assets 86 21 41 148 1 — — 1 — — — — Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 86 $ 20 $ 41 $ 147 $ 1 $ — $ — $ 1 $ — $ — $ — $ — __________ (a) PHI excludes cash of $89 million and $96 million at March 31, 2024 and December 31, 2023, respectively, and restricted cash of zero and $1 million at March 31, 2024 and December 31, 2023, respectively. Pepco excludes cash of $28 million and $48 million at March 31, 2024 and December 31, 2023, respectively, and restricted cash of zero and $1 million at March 31, 2024 and December 31, 2023, respectively. DPL excludes cash of $29 million and $15 million at March 31, 2024 and December 31, 2023, respectively. ACE excludes cash of $27 million and $21 million at March 31, 2024 and December 31, 2023, respectively. 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, 2024 and 2023: Exelon ComEd PHI and Pepco Three Months Ended March 31, 2024 Total Commodity Life Insurance Contracts Balance at December 31, 2023 $ (90) $ (133) $ 41 Total realized / unrealized gains (losses) Included in net income (a) — — — Included in regulatory assets/liabilities 25 25 (b) — Balance at March 31, 2024 $ (65) $ (108) (c) $ 41 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities at March 31, 2024 $ — $ — $ — Exelon ComEd PHI and Pepco Three Months Ended March 31, 2023 Total Commodity Life Insurance Contracts Balance at December 31, 2022 $ (44) $ (84) $ 40 Total realized / unrealized gains (losses) Included in net income (a) 1 — 1 Included in regulatory assets/liabilities (14) (14) (b) — Balance at March 31, 2023 $ (57) $ (98) $ 41 The amount of total gains included in income attributed to the change in unrealized gain related to assets and liabilities at March 31, 2023 $ 1 $ — $ 1 __________ (a) Classified in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Includes $13 million of increases in fair value and an increase for realized gains due to settlements of $12 million recorded in Purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended March 31, 2024. Includes $25 million of decreases in fair value and an increase for realized losses due to settlements of $11 million recorded in Purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended March 31, 2023. (c) The balance of the current and noncurrent asset was effectively zero as of March 31, 2024. The balance consists of a current and noncurrent liability of $29 million and $79 million, respectively, as of March 31, 2024. Commodity Derivatives (Exelon and ComEd) The table below discloses the significant unobservable inputs to the forward curve used to value mark-to-market derivatives. Type of trade Fair Value at March 31, 2024 Fair Value at December 31, 2023 Valuation Unobservable 2024 Range & Arithmetic Average 2023 Range & Arithmetic Average Commodity derivatives $ (108) $ (133) Discounted Forward power price (a) $22.68 - $84.62 $46.94 $30.27 - $73.71 $43.35 ________ (a) An increase to the forward power price would increase the fair value.

Commitments and Contingencies (

Commitments and Contingencies (All Registrants)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies (All Registrants)	Commitments and Contingencies (All Registrants) The following is an update to the current status of commitments and contingencies set forth in Note 18 — Commitments and Contingencies of the 2023 Form 10-K. Commitments PHI Merger Commitments (Exelon, PHI, Pepco, DPL, and ACE). Approval of the PHI Merger in Delaware, New Jersey, Maryland, and the District of Columbia was conditioned upon Exelon and PHI agreeing to certain commitments. The following amounts represent total commitment costs that have been recorded since the acquisition date and the total remaining obligations for Exelon, PHI, Pepco, DPL, and ACE at March 31, 2024: Description Exelon PHI Pepco DPL ACE Total commitments $ 513 $ 320 $ 120 $ 89 $ 111 Remaining commitments (a) 35 31 28 2 1 __________ (a) Remaining commitments extend through 2026 and include escrow funds, charitable contributions, and rate credits. Commercial Commitments (All Registrants). The Registrants’ commercial commitments at March 31, 2024, representing commitments potentially triggered by future events were as follows: Expiration within Total 2024 2025 2026 2027 2028 2029 and beyond Exelon Letters of credit (a) $ 32 $ 24 $ 8 $ — $ — $ — $ — Surety bonds (b) 194 181 13 — — — — Financing trust guarantees (c) 378 — — — — 78 300 Guaranteed lease residual values (d) 25 — 3 5 4 6 7 Total commercial commitments $ 629 $ 205 $ 24 $ 5 $ 4 $ 84 $ 307 ComEd Letters of credit (a) $ 17 $ 14 $ 3 $ — $ — $ — $ — Surety bonds (b) 36 34 2 — — — — Financing trust guarantees (c) 200 — — — — — 200 Total commercial commitments $ 253 $ 48 $ 5 $ — $ — $ — $ 200 PECO Letters of credit (a) $ 3 $ — $ 3 $ — $ — $ — $ — Surety bonds (b) 2 1 1 — — — — Financing trust guarantees (c) 178 — — — — 78 100 Total commercial commitments $ 183 $ 1 $ 4 $ — $ — $ 78 $ 100 BGE Letters of credit (a) $ 7 $ 7 $ — $ — $ — $ — $ — Surety bonds (b) 3 2 1 — — — — Total commercial commitments $ 10 $ 9 $ 1 $ — $ — $ — $ — PHI Surety bonds (b) $ 96 $ 91 $ 5 $ — $ — $ — $ — Guaranteed lease residual values (d) 25 — 3 5 4 6 7 Total commercial commitments $ 121 $ 91 $ 8 $ 5 $ 4 $ 6 $ 7 Pepco Surety bonds (a) $ 85 $ 84 $ 1 $ — $ — $ — $ — Guaranteed lease residual values (d) 8 — 1 2 1 2 2 Total commercial commitments $ 93 $ 84 $ 2 $ 2 $ 1 $ 2 $ 2 DPL Surety bonds (b) $ 6 $ 3 $ 3 $ — $ — $ — $ — Guaranteed lease residual values (d) 10 — 1 2 2 2 3 Total commercial commitments $ 16 $ 3 $ 4 $ 2 $ 2 $ 2 $ 3 ACE Surety bonds (b) $ 5 $ 4 $ 1 $ — $ — $ — $ — Guaranteed lease residual values (d) 7 — 1 1 1 2 2 Total commercial commitments $ 12 $ 4 $ 2 $ 1 $ 1 $ 2 $ 2 __________ (a) Exelon and certain of its subsidiaries maintain non-debt letters of credit to provide credit support for certain transactions as requested by third parties. (b) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds. Historically, payments under the guarantees have not been made and the likelihood of payments being required is remote. (c) Reflects guarantee of ComEd and PECO securities held by ComEd Financing III, PECO Trust III, and PECO Trust IV. (d) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The lease term associated with these assets ranges from 1 to 9 years. The maximum potential obligation at the end of the minimum lease term would be $57 million guaranteed by Exelon and PHI, of which $19 million, $22 million, and $16 million is guaranteed by Pepco, DPL, and ACE, respectively. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote. Environmental Remediation Matters General (All Registrants). The Registrants’ 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, the Registrants are generally liable for the costs of remediating environmental contamination of property now or formerly owned by them and of property contaminated by hazardous substances generated by them. The Registrants own or lease a number of real estate parcels, including parcels on which their operations or the operations of others may have resulted in contamination by substances that are considered hazardous under environmental laws. In addition, the Registrants are currently involved in a number of proceedings relating to sites where hazardous substances have been deposited and may be subject to additional proceedings in the future. Unless otherwise disclosed, the Registrants cannot reasonably estimate whether they will incur significant liabilities for additional investigation and remediation costs at these or additional sites identified by the Registrants, environmental agencies or others, or whether such costs will be recoverable from third parties, including customers. Additional costs could have a material, unfavorable impact on the Registrants' financial statements. MGP Sites (All Registrants). ComEd, PECO, BGE, and DPL have identified sites where former MGP or gas purification activities have or may have resulted in actual site contamination. For some sites, there are additional PRPs that may share responsibility for the ultimate remediation of each location. • ComEd has 16 sites that are currently under some degree of active study and/or remediation. ComEd expects the majority of the remediation at these sites to continue through at least 2031. • PECO has 6 sites that are currently under some degree of active study and/or remediation. PECO expects the majority of the remediation at these sites to continue through at least 2025. • BGE has 4 sites that currently require some level of remediation and/or ongoing activity. BGE expects the majority of the remediation at these sites to continue through at least 2025. • DPL has 1 site that is currently under study and the required cost at the site is not expected to be material. The historical nature of the MGP and gas purification sites and the fact that many of the sites have been buried and built over, impacts the ability to determine a precise estimate of the ultimate costs prior to initial sampling and determination of the exact scope and method of remedial activity. Management determines its best estimate of remediation costs using all available information at the time of each study, including probabilistic and deterministic modeling for ComEd and PECO, and the remediation standards currently required by the applicable state environmental agency. Prior to completion of any significant clean up, each site remediation plan is approved by the appropriate state environmental agency. ComEd, pursuant to an ICC order, and PECO, pursuant to a PAPUC order, are currently recovering environmental remediation costs of former MGP facility sites through customer rates. While BGE and DPL do not have riders for MGP clean-up costs, they have historically received recovery of actual clean-up costs in distribution rates. At March 31, 2024 and December 31, 2023, the Registrants had accrued the following undiscounted amounts for environmental liabilities in Accrued expenses, Other current liabilities, and Other deferred credits and other liabilities in their respective Consolidated Balance Sheets: March 31, 2024 December 31, 2023 Total Environmental Portion of Total Related to Total Environmental Portion of Total Related to Exelon $ 413 $ 328 $ 428 $ 338 ComEd 293 292 303 302 PECO 27 25 27 25 BGE 14 11 14 11 PHI 76 — 81 — Pepco 74 — 79 — DPL 1 — 1 — ACE 1 — 1 — Benning Road Site (Exelon, PHI, and Pepco) . In September 2010, PHI received a letter from EPA identifying the Benning Road site as one of six land-based sites potentially contributing to contamination of the lower Anacostia River. A portion of the site, which is owned by Pepco, was formerly the location of an electric generating facility owned by Pepco subsidiary, Pepco Energy Services (PES), which became a part of Generation, following the 2016 merger between PHI and Exelon. This generating facility was deactivated in June 2012. The remaining portion of the site consists of a Pepco transmission and distribution service center that remains in operation. In December 2011, the U.S. District Court for the District of Columbia approved a Consent Decree entered into by Pepco and Pepco Energy Services (hereinafter "Pepco Entities") with the DOEE, which requires the Pepco Entities to conduct a Remedial Investigation and Feasibility Study (RI/FS) for the Benning Road site and an approximately 10 to 15-acre portion of the adjacent Anacostia River. The purpose of this RI/FS is to define the nature and extent of contamination from the Benning Road site and to evaluate remedial alternatives. Pursuant to an internal agreement between the Pepco Entities, since 2013, Pepco has performed the work required by the Consent Decree and has been reimbursed for that work by an agreed upon allocation of costs between the Pepco Entities. In September 2019, the Pepco Entities issued a draft “final” RI report which DOEE approved on February 3, 2020. The Pepco Entities are completing a FS to evaluate possible remedial alternatives for submission to DOEE. In October 2022, DOEE approved dividing the work to complete the landside portion of the FS from the waterside portion to expedite the overall schedule for completion of the project. The landside FS was approved by DOEE on March 15, 2024, and the waterside FS is scheduled to be complete and approved by DOEE by the end of the fourth quarter of 2024. Following the completion of each FS, DOEE will issue a Proposed Plan for public comment and then issue a Record of Decision (ROD) identifying the remedial actions determined to be necessary for the area in question. On October 3, 2023, DOEE and Pepco entered into an addendum to the Benning Consent Decree pursuant to which Pepco has agreed to fund or perform the remedial actions to be selected by DOEE for the landslide and water areas. This addendum to the Benning Consent Decree was entered by the Court on February 27, 2024 and became effective on that date. As part of the separation between Exelon and Constellation in February 2022, the internal agreement between the Pepco Entities for completion and payment for the remaining Consent Decree work was memorialized in a formal agreement for post-separation activities. A second post-separation assumption agreement between Exelon and Constellation transferred any of the potential remaining remediation liability, if any, of PES/Generation to a non-utility subsidiary of Exelon which going forward will be responsible for those liabilities. Exelon, PHI, and Pepco have determined that a loss associated with this matter is probable and have accrued an estimated liability, which is included in the table above. Anacostia River Tidal Reach (Exelon, PHI, and Pepco) . Contemporaneous with the Benning Road site RI/FS being performed by the Pepco Entities, DOEE and NPS have been conducting a separate RI/FS focused on the entire tidal reach of the Anacostia River extending from just north of the Maryland-District of Columbia boundary line to the confluence of the Anacostia and Potomac Rivers. The river-wide RI incorporated the results of the river sampling performed by the Pepco Entities as part of the Benning RI/FS, as well as similar sampling efforts conducted by owners of other sites adjacent to this segment of the river and supplemental river sampling conducted by DOEE’s contractor. On September 30, 2020, DOEE released its Interim ROD for the Anacostia River sediments. The Interim ROD reflects an adaptive management approach which will require several identified “hot spots” in the river to be addressed first while continuing to conduct studies and to monitor the river to evaluate improvements and determine potential future remediation plans. The adaptive management process chosen by DOEE is less intrusive, provides more long-term environmental certainty, is less costly, and allows for site specific remediation plans already underway, including the plan for the Benning Road site to proceed to conclusion. On July 15, 2022, Pepco received a letter from the District of Columbia's Office of the Attorney General (D.C. OAG) on behalf of DOEE conveying a settlement offer to resolve all PRPs' liability to the District of Columbia (District) for their past costs and their anticipated future costs to complete the work for the Interim ROD. Pepco responded on July 27, 2022 to enter into settlement discussions. On October 3, 2023, Pepco and the District entered into another consent decree (the “Anacostia River Consent Decree”) pursuant to which Pepco agreed to pay $47 million to resolve its liability to the District for all past costs to perform the river-wide RI/FS and all future costs to complete the work required by the Interim ROD. This amount will be paid in four equal annual installments beginning a year after the effective date of the Anacostia River Consent Decree. The funds will be deposited into the DOEE’s Clean Land Fund for the District’s costs of the Interim ROD work. The Anacostia River Consent Decree caps Pepco’s liability for these costs and provides Pepco with the right to seek contribution from other potentially responsible parties. The Anacostia River Consent Decree was signed by the judge for the U.S. District Court for the District of Columbia and became effective on April 11, 2024. Exelon, PHI, and Pepco have accrued a liability for Pepco’s payment obligations under the Anacostia Consent Decree and management's best estimate of its share of any other future Anacostia River response costs. Pepco has concluded that incremental exposure remains reasonably possible, but management cannot reasonably estimate a range of loss beyond the amounts recorded, which are included in the table above. In addition to the activities associated with the remedial process outlined above, CERCLA separately requires federal and state (here including Washington, D.C.) Natural Resource Trustees (federal or state agencies designated by the President or the relevant state, respectively, or Indian tribes) to conduct an assessment of any damages to natural resources within their jurisdiction as a result of the contamination that is being remediated. The Trustees can seek compensation from responsible parties for such damages, including restoration costs. During the second quarter of 2018, Pepco became aware that the Trustees are in the beginning stages of a NRD assessment, a process that often takes many years beyond the remedial decision to complete. Pepco has concluded that a loss associated with the eventual NRD assessment is reasonably possible. Due to the very early stage of the NRD process, Pepco cannot reasonably estimate the final range of loss potentially resulting from this process. As noted in the Benning Road Site disclosure above, as part of the separation of Exelon and Constellation in February 2022, an assumption agreement was executed transferring any potential future remediation liabilities associated with the Benning Site remediation to a non-utility subsidiary of Exelon. Similarly, any potential future liability associated with the Anacostia River Sediment Project (ARSP) was also assumed by this entity. Buzzard Point Site (Exelon, PHI, and Pepco). On December 8, 2022, Pepco received a letter from the D.C. OAG, alleging wholly past violations of the District's stormwater discharge and waste disposal requirements related to operations at the Buzzard Point facility, a 9-acre parcel of waterfront property in Washington, D.C. occupied by an active substation and former steam plant building. The letter also alleged wholly past violations by Pepco of stormwater discharge requirements related to its district-wide system of underground vaults. On October 3, 2023, Pepco entered into a Consent Order with the District of Columbia to resolve the alleged violations without any admission of liability. The Consent Order requires Pepco to pay a civil penalty of $10 million. In addition, Pepco has agreed to assess the environmental conditions at its Buzzard Point facility and conduct any remedial actions deemed necessary as a result of the assessment, and also to assess potential environmental impacts associated with the operation of its underground vaults. The Consent Order was lodged with the District of Columbia Superior Court in January 2024. The court signed and entered the Consent Order, and it became effective on February 2, 2024. Exelon, PHI, and Pepco have accrued a liability for the penalty payments and for the projected costs for the required environmental assessments and remediation. Pepco has concluded that incremental exposure is reasonably possible, but the range of loss cannot be reasonably estimated beyond the amounts included in the table above. Litigation and Regulatory Matters DPA and Related Matters (Exelon and ComEd). Exelon and ComEd received a grand jury subpoena in the second quarter of 2019 from the U.S. Attorney’s Office for the Northern District of Illinois (USAO) requiring production of information concerning their lobbying activities in the State of Illinois. On October 4, 2019, Exelon and ComEd received a second grand jury subpoena from the USAO requiring production of records of any communications with certain individuals and entities. On October 22, 2019, the SEC notified Exelon and ComEd that it had also opened an investigation into their lobbying activities. On July 17, 2020, ComEd entered into a DPA with the USAO to resolve the USAO investigation, which included a payment to the U.S. Treasury of $200 million, which was paid in November 2020. The three-year term of the DPA ended on July 17, 2023, and on that same date the court granted the USAO’s motion to dismiss the pending charge against ComEd that had been deferred by the DPA. On September 28, 2023, Exelon and ComEd reached a settlement with the SEC, concluding and resolving in its entirety the SEC investigation, which related to the conduct identified in the DPA that was entered into by ComEd in July 2020 and successfully exited in July 2023. Under the terms of the settlement, Exelon has agreed to pay a civil penalty of $46.2 million and Exelon and ComEd have agreed to cease and desist from committing or causing any violations and any future violations of specified provisions of the federal securities laws and rules promulgated thereunder. Exelon recorded an accrual for the full amount of the penalty in the second quarter of 2023, which was reflected in Operating and maintenance expense within Exelon's Consolidated Statements of Operations and Comprehensive Income and in Accrued expenses on the Consolidated Balance Sheets. Exelon paid the civil penalty in full on October 4, 2023. Subsequent to Exelon announcing the receipt of the USAO subpoenas, various lawsuits were filed, and various demand letters were received related to the subject of the subpoenas, the conduct described in the DPA and the SEC's investigation, including: • Four putative class action lawsuits against ComEd and Exelon were filed in federal court on behalf of ComEd customers in the third quarter of 2020 alleging, among other things, civil violations of federal racketeering laws. On September 9, 2021, the federal court granted ComEd and Exelon’s motion to dismiss and dismissed plaintiffs’ federal law claim with prejudice. The federal court also dismissed the related state law claims made by the federal plaintiffs on jurisdictional grounds. Plaintiffs appealed dismissal of the federal law claim to the Seventh Circuit Court of Appeals, and refiled their state law claims in state court. On August 22, 2022, the Seventh Circuit affirmed the dismissal of the consolidated federal cases in their entirety. The time to further appeal has passed and the Seventh Circuit’s decision is final. • Three putative class action lawsuits against ComEd and Exelon were filed in Illinois state court in the third quarter of 2020 seeking restitution and compensatory damages on behalf of ComEd customers. The cases were consolidated into a single action in October of 2020. ComEd and Exelon filed a motion to dismiss on January 11, 2021. On December 23, 2021, the state court granted ComEd and Exelon's motion to dismiss with prejudice. Plaintiffs appealed the court's ruling dismissing their complaint to the First District Court of Appeals. On February 15, 2022, ComEd and Exelon moved to dismiss the federal plaintiffs' refiled state law claims, seeking dismissal on the same legal grounds asserted in their motion to dismiss the original state court plaintiffs' complaint. The court granted dismissal of the refiled state claims on February 16, 2022. The original federal plaintiffs appealed that dismissal on February 18, 2022. The two state appeals were consolidated on March 21, 2022. On September 8, 2023, the appellate court affirmed the dismissal. On December 22, 2023, plaintiffs filed a petition for leave to appeal to the Illinois Supreme Court, which ComEd and Exelon responded to on January 12, 2024. On March 27, 2024, the Illinois Supreme Court denied plaintiffs' petition for leave to appeal. The dismissal of this action is final. • On November 3, 2022, a plaintiff filed a putative class action complaint in Lake County, Illinois Circuit Court against ComEd and Exelon for unjust enrichment and deceptive business practices in connection with the conduct giving rise to the DPA. Plaintiff seeks an accounting and disgorgement of any benefits ComEd allegedly obtained from said conduct. ComEd and Exelon filed a motion to dismiss the Complaint on February 3, 2023. On June 16, 2023, the court granted ComEd and Exelon's motion to dismiss the action with prejudice. Plaintiff filed its notice of appeal of that dismissal on July 17, 2023. On April 12, 2024, the appellate court issued its decision affirming dismissal of the action. • A putative class action lawsuit against Exelon and certain officers of Exelon and ComEd was filed in federal court in December 2019 alleging misrepresentations and omissions in Exelon’s SEC filings related to ComEd’s lobbying activities and the related investigations. The complaint was amended on September 16, 2020, to dismiss two of the original defendants and add other defendants, including ComEd. Defendants filed a motion to dismiss in November 2020. The court denied the motion in April 2021. Following mediation, the parties reached a settlement of the lawsuit, under which defendants agreed to pay plaintiffs $173 million. On May 26, 2023, plaintiffs filed a motion for preliminary approval of the settlement, which the court granted on June 9, 2023. The court granted final settlement approval on September 7, 2023. The settlement was fully covered by insurance and has been paid in full. • Several shareholders have sent letters to the Exelon Board of Directors since 2020 demanding, among other things, that the Exelon Board of Directors investigate and address alleged breaches of fiduciary duties and other alleged violations by Exelon and ComEd officers and directors related to the conduct described in the DPA. In the first quarter of 2021, the Exelon Board of Directors appointed a Special Litigation Committee (SLC) consisting of disinterested and independent parties to investigate and address these shareholders’ allegations and make recommendations to the Exelon Board of Directors based on the outcome of the SLC’s investigation. In July 2021, one of the demand letter shareholders filed a derivative action against current and former Exelon and ComEd officers and directors, and against Exelon, as nominal defendant, asserting the same claims made in its demand letter. Since that date, multiple parties have filed separate derivative lawsuits that were subsequently consolidated. On October 12, 2021, the parties filed an agreed motion to stay the litigation for 120 days in order to allow the SLC to continue its investigation, which the court granted. The stay has been extended several times. Through mediation efforts, a settlement of the derivative claims was reached by the SLC, the Independent Review Committee of the Board (which had been formed in the third quarter of 2022, to ensure the Board’s consideration of any SLC recommendations would be independent and objective), the Board, and certain of the derivative shareholders. On June 16, 2023, the SLC filed a motion for preliminary approval of the settlement, attaching the Stipulation and Agreement of Settlement (Stipulation), which contains the terms of the proposed settlement. The proposed settlement terms include but are not limited to: a payment of $40 million to Exelon by Exelon’s insurers of which $10 million constitutes the attorneys’ fee award to be paid to the Settling Shareholders’ counsel; various compliance and disclosure-related reforms; and certain changes in Board and Committee composition. On June 30, 2023, the court granted the non-settling shareholders’ request for limited discovery into the settlement. Following that discovery, on October 26, 2023, the SLC filed its renewed motion for preliminary approval with supporting submissions filed by the Independent Review Committee, Exelon, and the settling shareholders on that same day. The parties briefing on preliminary approval was completed on January 18, 2024. In August 2022, the ICC concluded its investigation initiated on August 12, 2021 into rate impacts of conduct admitted in the DPA, including the costs recovered from customers related to the DPA and Exelon's funding of the fine paid by ComEd. On August 17, 2022, the ICC issued its final order accepting ComEd's voluntary customer refund offer of approximately $38 million (of which about $31 million is ICC jurisdictional; the remaining balance is FERC jurisdictional) that resolves the question of whether customer funds were used for DPA related activities. The customer refund includes the cost of every individual or entity that was either (i) identified in the DPA or (ii) identified by ComEd as an associate of the former Speaker of the Illinois House of Representatives in the ICC proceeding. The ICC’s DPA investigation is now closed. The ICC jurisdictional refund was made to customers during the April 2023 billing cycle, as required by the ICC. The FERC jurisdictional refund was included in ComEd's transmission formula rate update proceeding, filed on May 12, 2023. The filed transmission rate, inclusive of the FERC jurisdictional DPA refund, will appear on ComEd retail customers' bills for the June 2023 through May 2024 monthly billing periods, in the line designated as "Transmission Services Charge." The customer refund will not be recovered in rates or charged to customers and ComEd will not seek or accept reimbursement or indemnification from any source other than Exelon. An accrual for the amount of the customer refund has been recorded in Regulatory assets in Exelon’s and ComEd’s Consolidated Balance Sheets as of March 31, 2024. General (All Registrants). The Registrants are involved in various other litigation matters that are being defended and handled in the ordinary course of business. The Registrants are also from time to time subject to audits and investigations by the FERC and other regulators. 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. The Registrants 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 (Exelon)

Shareholders' Equity (Exelon)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Shareholders' Equity (Exelon)	Shareholders' Equity (Exelon) At-the-Market Program On August 4, 2022, Exelon executed an equity distribution agreement (“Equity Distribution Agreement”), with certain sales agents and forward sellers and certain forward purchasers, establishing an ATM equity distribution program under which it may offer and sell shares of its Common stock, having an aggregate gross sales price of up to $1.0 billion. Exelon has no obligation to offer or sell any shares of Common stock under the Equity Distribution Agreement and may, at any time, suspend or terminate offers and sales under the Equity Distribution Agreement. In November and December 2023, Exelon issued approximately 3.6 million shares of Common stock at an average gross price of $39.58 per share. The net proceeds from these issuances were $140 million, which were used for general corporate purposes. As of March 31, 2024, $858 million of Common stock remained available for sale pursuant to the ATM program.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Income (Exelon)	3 Months Ended
	Mar. 31, 2024
Changes in Accumulated Other Comprehensive Income [Abstract]
Changes in Accumulated Other Comprehensive Income	Changes in Accumulated Other Comprehensive Income (Loss) (Exelon) The following table presents changes in Exelon's AOCI, net of tax, by component: Three Months Ended March 31, 2024 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Total Balance at December 31, 2023 $ (3) $ (723) $ (726) OCI before reclassifications 34 (24) 10 Amounts reclassified from AOCI (1) 5 4 Net current-period OCI $ 33 $ (19) $ 14 Balance at March 31, 2024 $ 30 $ (742) $ (712) Three Months Ended March 31, 2023 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Total Balance at December 31, 2022 $ 2 $ (640) $ (638) OCI before reclassifications 6 (10) (4) Amounts reclassified from AOCI — 3 3 Net current-period OCI $ 6 $ (7) $ (1) Balance at March 31, 2023 $ 8 $ (647) $ (639) __________ (a) This AOCI component is included in the computation of net periodic pension and OPEB cost. See Note 14 — Retirement Benefits of the 2023 Form 10-K and Note 7 — Retirement Benefits for additional information. See Exelon's Statements of Operations and Comprehensive Income for individual components of AOCI. The following table presents Income tax benefit (expense) allocated to each component of Exelon's Other comprehensive income (loss): Three Months Ended March 31, 2024 2023 Pension and non-pension postretirement benefit plans: Actuarial losses reclassified to periodic benefit cost $ (2) $ (1) Pension and non-pension postretirement benefit plans valuation adjustments 8 3 Unrealized gains on cash flow hedges (10) (1)

Supplemental Financial Informat

Supplemental Financial Information (All Registrants)	3 Months Ended
	Mar. 31, 2024
Supplemental Financial Information [Abstract]
Supplemental Financial Information (All Registrants)	Supplemental Financial Information (All Registrants) Supplemental Statement of Operations Information The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Operations and Comprehensive Income: Taxes other than income taxes Exelon ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2024 Utility taxes (a) $ 229 $ 75 $ 41 $ 31 $ 82 $ 74 $ 8 $ — Property 105 9 4 53 38 26 11 1 Payroll 34 9 5 5 7 2 1 1 Three Months Ended March 31, 2023 Utility taxes (a) $ 220 $ 74 $ 40 $ 29 $ 77 $ 68 $ 8 $ 1 Property 99 10 4 50 35 24 11 — Payroll 32 7 5 5 7 2 1 1 _________ (a) The Registrants' utility taxes represent municipal and state utility taxes and gross receipts taxes related to their operating revenues. The offsetting collection of utility taxes from customers is recorded in revenues in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. Other, net Exelon ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2024 AFUDC — Equity $ 40 $ 10 $ 8 $ 7 $ 15 $ 12 $ 3 $ — Non-service net periodic benefit cost (7) — — — — — — — Three Months Ended March 31, 2023 AFUDC — Equity $ 38 $ 10 $ 6 $ 3 $ 19 $ 14 $ 2 $ 3 Non-service net periodic benefit cost (1) — — — — — — — Supplemental Cash Flow Information The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Cash Flows. Depreciation, amortization, and accretion Exelon ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2024 Property, plant, and equipment (a) $ 711 $ 284 $ 101 $ 122 $ 190 $ 81 $ 52 $ 53 Amortization of regulatory assets and liabilities, net (a) 166 78 3 28 56 26 9 21 Amortization of intangible assets, net (a) 2 — — — — — — — ARO accretion (b) 1 — — — — — — — Total depreciation, amortization and accretion $ 880 $ 362 $ 104 $ 150 $ 246 $ 107 $ 61 $ 74 Three Months Ended March 31, 2023 Property, plant, and equipment (a) $ 680 $ 267 $ 95 $ 124 $ 180 $ 76 $ 51 $ 47 Amortization of regulatory assets and liabilities, net (a) 178 71 3 43 61 32 9 20 Amortization of intangible assets, net (a) 2 — — — — — — — Total depreciation and amortization $ 860 $ 338 $ 98 $ 167 $ 241 $ 108 $ 60 $ 67 __________ (a) Included in Depreciation and amortization expense in the Registrants' Consolidated Statements of Operations and Comprehensive Income. (b) Included in Operating and maintenance expense in Exelon's Consolidated Statements of Operations and Comprehensive Income. Other non-cash operating activities Exelon ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2024 Pension and OPEB costs $ 61 $ 17 $ — $ 15 $ 23 $ 9 $ 4 $ 3 Allowance for credit losses 63 2 27 12 22 16 3 3 True-up adjustments to decoupling mechanisms and formula rates (a) (91) (19) 2 (43) (31) (29) 4 (6) Amortization of operating ROU asset 9 — — 2 6 1 2 1 AFUDC — Equity (40) (10) (8) (7) (15) (12) (3) — Three Months Ended March 31, 2023 Pension and OPEB costs (benefit) $ 45 $ 6 $ (3) $ 14 $ 24 $ 8 $ 4 $ 4 Allowance for credit losses 70 — 37 18 15 7 5 3 True-up adjustments to decoupling mechanisms and formula rates (a) (282) (153) 4 (65) (68) (39) (11) (18) Long-term incentive plan 2 — — — — — — — Amortization of operating ROU asset 10 1 — 1 7 1 2 1 Change in environmental liabilities 25 — — — 25 25 — — AFUDC — Equity (38) (10) (6) (3) (19) (14) (2) (3) __________ (a) For ComEd, reflects the true-up adjustments in Regulatory assets and liabilities associated with its distribution, energy efficiency, distributed generation, and transmission formula rates. For PECO, reflects the change in Regulatory assets and liabilities associated with its transmission formula rates. For BGE, Pepco, DPL, and ACE, reflects the change in Regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. See Note 3 — Regulatory Matters of the 2023 Form 10-K for additional information. The following tables provide a reconciliation of cash, cash equivalents, and restricted cash reported within the Registrants’ Consolidated Balance Sheets that sum to the total of the same amounts in their Consolidated Statements of Cash Flows. Cash, cash equivalents, and restricted cash Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at March 31, 2024 Cash and cash equivalents $ 720 $ 100 $ 39 $ 27 $ 504 $ 198 $ 269 $ 27 Restricted cash and cash equivalents 489 428 9 — 23 22 1 — Restricted cash included in Other deferred debits and other assets 99 99 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,308 $ 627 $ 48 $ 27 $ 527 $ 220 $ 270 $ 27 Balance at December 31, 2023 Cash and cash equivalents $ 445 $ 110 $ 42 $ 47 $ 180 $ 48 $ 16 $ 21 Restricted cash and cash equivalents 482 402 9 1 24 24 — — Restricted cash included in Other deferred debits and other assets 174 174 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,101 $ 686 $ 51 $ 48 $ 204 $ 72 $ 16 $ 21 Balance at March 31, 2023 Cash and cash equivalents $ 522 $ 75 $ 27 $ 20 $ 367 $ 126 $ 142 $ 71 Restricted cash and cash equivalents 381 323 9 1 29 27 1 — Restricted cash included in Other deferred debits and other assets 180 180 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,083 $ 578 $ 36 $ 21 $ 396 $ 153 $ 143 $ 71 For additional information on restricted cash see Note 1 — Significant Accounting Policies of the 2023 Form 10-K. Supplemental Balance Sheet Information The following table provides additional information about material items recorded in the Registrants' Consolidated Balance Sheets. Accrued expenses Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at March 31, 2024 Compensation-related accruals (a) $ 349 $ 102 $ 46 $ 46 $ 59 $ 19 $ 12 $ 8 Taxes accrued 237 214 93 140 170 135 42 16 Interest accrued 408 80 54 59 87 40 29 17 Balance at December 31, 2023 Compensation-related accruals (a) $ 661 $ 206 $ 87 $ 81 $ 107 $ 27 $ 17 $ 12 Taxes accrued 221 204 96 75 137 116 30 10 Interest accrued 414 148 49 44 72 38 13 15 __________ (a) Primarily includes accrued payroll, bonuses and other incentives, vacation, and benefits.

Related Party Transactions (All

Related Party Transactions (All Registrants)	3 Months Ended
	Mar. 31, 2024
Related Party Transactions [Abstract]
Related Party Transactions (All Registrants)	Related Party Transactions (All Registrants) Service Company Costs for Corporate Support The Registrants receive a variety of corporate support services from BSC. Pepco, DPL, and ACE also receive corporate support services from PHISCO. See Note 1 — Significant Accounting Policies for additional information regarding BSC and PHISCO. The following table presents the service company costs allocated to the Registrants: Operating and maintenance from affiliates Capitalized costs Three Months Ended March 31, Three Months Ended March 31, 2024 2023 2024 2023 Exelon BSC $ 158 $ 175 PHISCO 29 24 ComEd BSC $ 100 $ 83 71 81 PECO BSC 58 51 29 30 BGE BSC 59 54 24 24 PHI BSC 50 42 34 40 PHISCO — — 29 24 Pepco BSC 31 27 17 14 PHISCO 33 30 12 11 DPL BSC 19 17 12 10 PHISCO 25 24 9 7 ACE BSC 16 14 5 14 PHISCO 23 22 8 6 Current Receivables from/Payables to Affiliates The following tables present current Receivables from affiliates and current Payables to affiliates: March 31, 2024 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 66 $ — $ 6 $ 72 PECO $ — — — — — 33 — 8 41 BGE — — — — — 35 — 2 37 PHI — — — — — — 6 — 11 17 Pepco — — — — — 19 17 1 37 DPL — — — — — 13 12 — 25 ACE — — — — — 10 12 — 22 Other 3 — — 1 — 4 — 8 Total $ 3 $ — $ — $ 1 $ — $ 4 $ 182 $ 41 $ 28 $ 259 December 31, 2023 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 64 $ — $ 8 $ 72 PECO $ — — — — — 36 — 3 39 BGE — — — — — 33 — 2 35 PHI — — — — — — 5 — 10 15 Pepco — — — — — 17 14 1 32 DPL — 1 — — — 12 11 1 25 ACE — 1 — 1 1 11 11 — 25 Other 3 — — 1 — 3 1 — 8 Total $ 3 $ 2 $ — $ 2 $ 1 $ 3 $ 179 $ 36 $ 25 $ 251 Borrowings from Exelon/PHI intercompany money pool To provide an additional short-term borrowing option that will generally be more favorable to the borrowing participants than the cost of external financing both Exelon and PHI operate an intercompany money pool. PECO and PHI Corporate participate in the Exelon intercompany money pool. Pepco, DPL, and ACE participate in the PHI intercompany money pool. Long-term debt to financing trusts The following table presents Long-term debt to financing trusts: March 31, 2024 December 31, 2023 Exelon ComEd PECO Exelon ComEd PECO ComEd Financing III $ 206 $ 205 $ — $ 206 $ 205 $ — PECO Trust III 81 — 81 81 — 81 PECO Trust IV 103 — 103 103 — 103 Total $ 390 $ 205 $ 184 $ 390 $ 205 $ 184

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Description of Business and Basis of Presentation (All Registrants)	Description of Business Exelon is a utility services holding company engaged in the energy transmission and distribution businesses through ComEd, PECO, BGE, Pepco, DPL, and ACE. Name of Registrant Business Service Territories Commonwealth Edison Company Purchase and regulated retail sale of electricity Northern Illinois, including the City of Chicago Transmission and distribution of electricity to retail customers PECO Energy Company Purchase and regulated retail sale of electricity and natural gas Southeastern Pennsylvania, including the City of Philadelphia (electricity) Transmission and distribution of electricity and distribution of natural gas to retail customers Pennsylvania counties surrounding the City of Philadelphia (natural gas) Baltimore Gas and Electric Company Purchase and regulated retail sale of electricity and natural gas Central Maryland, including the City of Baltimore (electricity and natural gas) Transmission and distribution of electricity and distribution of natural gas to retail customers Pepco Holdings LLC Utility services holding company engaged, through its reportable segments Pepco, DPL, and ACE Service Territories of Pepco, DPL, and ACE Potomac Electric Purchase and regulated retail sale of electricity District of Columbia, and major portions of Montgomery and Prince George’s Counties, Maryland Transmission and distribution of electricity to retail customers Delmarva Power & Purchase and regulated retail sale of electricity and natural gas Portions of Delaware and Maryland (electricity) Transmission and distribution of electricity and distribution of natural gas to retail customers Portions of New Castle County, Delaware (natural gas) Atlantic City Electric Company Purchase and regulated retail sale of electricity Portions of Southern New Jersey Transmission and distribution of electricity to retail customers Basis of Presentation This is a combined quarterly report of all Registrants. The Notes to the Consolidated Financial Statements apply to the Registrants as indicated parenthetically next to each corresponding disclosure. When appropriate, the Registrants are named specifically for their related activities and disclosures. Each of the Registrant’s Consolidated Financial Statements includes the accounts of its subsidiaries. All intercompany transactions have been eliminated. Through its business services subsidiary, BSC, Exelon provides its subsidiaries with a variety of support services at cost, including legal, human resources, financial, information technology, and supply management services. PHI also has a business services subsidiary, PHISCO, which provides a variety of support services at cost, including legal, finance, engineering, customer operations, distribution and transmission planning, asset management, system operations, and power procurement, to PHI operating companies. The costs of BSC and PHISCO are directly charged or allocated to the applicable subsidiaries. The results of Exelon’s corporate operations are presented as “Other” in the consolidated financial statements and include intercompany eliminations unless otherwise disclosed. The accompanying consolidated financial statements as of March 31, 2024 and for the three months ended March 31, 2024 and 2023 are unaudited but, in the opinion of each Registrant's management, the Registrants include all adjustments that are considered necessary for a fair statement of the Registrants’ respective financial statements in accordance with GAAP. All adjustments are of a normal, recurring nature, except as otherwise disclosed. The December 31, 2023 Consolidated Balance Sheets were derived from audited financial statements. The interim financial statements are to be read in conjunction with prior annual financial statements and notes. Additionally, 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, 2024. 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.
New Accounting Standards (All Registrants) [Policy Text Block]	New Accounting Standards (All Registrants) New Accounting Standards Issued and Not Yet Adopted as of March 31, 2024: The following new authoritative accounting guidance issued by the FASB has not yet been adopted and reflected by the Registrants in their consolidated financial statements as of March 31, 2024. Unless otherwise indicated, the Registrants are currently assessing the impacts such guidance may have (which could be material) in their Consolidated Balance Sheets, Consolidated Statements of Operations and Comprehensive Income, Consolidated Statements of Cash Flows and disclosures, as well as the potential to early adopt where applicable. The Registrants have assessed other FASB issuances of new standards which are not listed below given the current expectation that such standards will not significantly impact the Registrants' financial reporting. Segment Reporting (Issued November 2023). Improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The objective of the revised guidance is to introduce a new requirement to disclose significant segment expenses regularly provided to the CODM, extend certain annual disclosures to interim periods, clarify single reportable segment entities must apply ASC 280 in its entirety, permit more than one measure of segment profit or loss to be reported under certain conditions, and require disclosure of the title and position of the CODM. The standard is effective for annual periods beginning January 1, 2024 and interim periods beginning January 1, 2025, with early adoption permitted. The standard will be applied retrospectively. Improvement to Income Tax Disclosures (Issued December 2023).

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2024
Regulated Operations [Abstract]
Public Utilities Distribution Rate Cases [Table Text Block]	The following tables show the completed and pending distribution base rate case proceedings in 2024. Completed Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Approved Revenue Requirement Increase Approved ROE Approval Date Rate Effective Date ComEd - Illinois January 17, 2023 Electric $ 1,487 $ 501 8.905% December 14, 2023 (a) January 1, 2024 $ 838 $ 810 8.905% April 18, 2024 (b) May 1, 2024 April 21, 2023 (c) Electric $ 247 $ 259 8.91% November 30, 2023 January 1, 2024 BGE - Maryland (d) February 17, 2023 Electric $ 313 $ 179 9.50% December 14, 2023 January 1, 2024 Natural Gas $ 289 $ 229 9.45% Pepco - Maryland (e) October 26, 2020 (amended March 31, 2021) Electric $ 104 $ 52 9.55% June 28, 2021 June 28, 2021 DPL - Maryland (f) May 19, 2022 Electric $ 38 $ 29 9.60% December 14, 2022 January 1, 2023 DPL - Delaware December 15, 2022 (amended September 29, 2023) Electric $ 39 $ 28 9.60% April 18, 2024 July 15, 2023 ACE - New Jersey (g) February 15, 2023 (amended August 21, 2023) Electric $ 92 $ 45 9.60% November 17, 2023 December 1, 2023 __________ (a) Reflects a four-year cumulative multi-year rate plan for January 1, 2024 to December 31, 2027. On December 14, 2023, the ICC approved year-over-year distribution revenue requirement increases in 2024-2027, with an amendatory order on January 10, 2024, of approximately $451 million effective January 1, 2024, $14 million effective January 1, 2025, $6 million effective January 1, 2026, and $30 million effective January 1, 2027, based on an ROE of 8.905%, an equity ratio of 50%, and year end 2022 rate base. The ICC rejected ComEd’s Grid Plan, requiring ComEd to file a revised Grid Plan by March 13, 2024, 90 days after the issuance of the December final order. The ICC also directed that the revised Grid Plan would be reviewed through further formal proceedings in that docket. On January 10, 2024, the ICC granted one portion of ComEd’s application for rehearing of the December 14, 2023 final order, and directed that a rehearing process extending no more than 150 days reconsider certain components of the revenue requirements for the test years (2024-2027), absent an approved Grid Plan. On January 10, 2024, ComEd also filed with the Illinois appellate court an appeal of various aspects of the ICC’s final order on which rehearing was denied, including the 8.905% ROE and 50% equity ratio and denial of any return on ComEd’s pension asset. On March 13, 2024, ComEd filed its revised Grid Plan (Refiled Grid Plan) with supporting testimony and schedules with the ICC. On March 15, 2024, ComEd filed a petition to adjust its MRP to authorize increased rates consistent with the Refiled Grid Plan. (b) Reflects four-year cumulative increase to the revenue requirement approved on December 14, 2023 and amended on January 10, 2024 of $810 million for January 1, 2024 to December 31, 2027 resulting from the rehearing on certain components of the rate plan. On February 16, 2024, ComEd filed a revised revenue request for an $838 million increase in its 2024-2027 revenue requirements based on the ICC’s limited scope for rehearing which included the value of the 2023 forecasted year-end rate base. On April 18, 2024, the ICC issued an order on the rehearing filing which increased the revenue requirements previously approved by the ICC in its January 10, 2024, amendatory order by $150 million in 2024, $186 million in 2025, $221 million in 2026 and $253 million in 2027. ComEd anticipates that the revenue requirements determined during the rehearing process will be further adjusted upon approval of the Refiled Grid Plan and the pending petition to adjust rates. (c) On November 30, 2023, the Delivery Reconciliation Amount for 2022 defined in Rider Delivery Service Pricing Reconciliation (Rider DSPR) was approved. The delivery reconciliation amount allows for the reconciliation of the revenue requirement in effect in the final years in which formula rates are determined and until such time as new rates are established under ComEd’s approved MRP. The 2023 filing reconciled the delivery service rates in effect in 2022 with the actual delivery service costs incurred in 2022. The reconciliation revenue requirement provides for a weighted average debt and equity return on distribution rate base of 6.48%, inclusive of an allowed ROE of 8.91%, reflecting the monthly yields on 30-year treasury bonds plus 580 basis points. (d) Reflects a three-year cumulative multi-year plan for January 1, 2024 through December 31, 2026. The MDPSC awarded BGE electric revenue requirement increases of $41 million, $113 million, and $25 million in 2024, 2025, and 2026, respectively, and natural gas revenue requirement increases of $126 million, $62 million, and $41 million in 2024, 2025, and 2026, respectively. Requested revenue requirement increases will be used to recover capital investments designed to increase the resilience of the electric and gas distribution systems and support Maryland's climate and regulatory initiatives. The MDPSC also approved a portion of the requested 2021 and 2022 reconciliation amounts, which will be recovered through separate electric and gas riders between March 2024 through February 2025. As such, the reconciliation amounts are not included in the approved revenue requirement increases. The 2021 reconciliation amounts are $13 million and $7 million for electric and gas, respectively, and the 2022 reconciliation amounts are $39 million and $15 million for electric and gas, respectively. In April 2024, BGE filed with the MDPSC its request for recovery of the 2023 reconciliation amounts of $79 million and $73 million for electric and gas, respectively, with supporting testimony and schedules. (e) Reflects a three-year cumulative multi-year plan for April 1, 2021 through March 31, 2024. The MDPSC awarded Pepco electric incremental revenue requirement increases of $21 million, $16 million, and $15 million, before offsets, for the 12-month periods ending March 31, 2022, 2023, and 2024, respectively. Pepco proposed to utilize certain tax benefits to fully offset the increase through 2023 and partially offset customer rate increases in 2024. However, the MDPSC only utilized the acceleration of refunds for certain tax benefits to fully offset the increases such that customer rates remain unchanged through March 31, 2022. On February 23, 2022, the MDPSC chose to offset 25% of the cumulative revenue requirement increase for the 12-month period ending March 31, 2023. In 2021, the MDPSC deferred a decision on whether to use certain tax benefits to offset the revenue requirement increases for the 12-month period ending March 31, 2024. In December 2022 Pepco proposed that tax benefits not be used to offset the revenue requirement increases for this period. On January 25, 2023, the MDPSC accepted Pepco’s recommendations not to use tax benefits to offset revenue requirement increases for the 12-month period ending March 31, 2024. (f) Reflects a three-year cumulative multi-year plan for January 1, 2023 through December 31, 2025. The MDPSC awarded DPL electric incremental revenue requirement increases of $17 million, $6 million, and $6 million for 2023, 2024, and 2025, respectively. (g) Requested and approved increases are before New Jersey sales and use tax. The NJBPU awarded ACE electric revenue requirement increases of $36 million and $9 million effective December 1, 2023 and February 1, 2024, respectively. Pending Distribution Base Rate Case Proceedings Registrant/Jurisdiction Filing Date Service Requested Revenue Requirement Increase Requested ROE Expected Approval Timing ComEd - Illinois March 15, 2024 Electric (a) $ 670 8.905% December 2024 April 26, 2024 Electric (b) $ 627 9.89% December 2024 PECO - Pennsylvania March 28, 2024 Electric (c) $ 464 10.95% Fourth quarter of 2024 Natural Gas $ 111 11.15% Pepco - District of Columbia (d) April 13, 2023 (amended February 27, 2024) Electric $ 186 10.50% Third quarter of 2024 Pepco - Maryland (e) May 16, 2023 (amended February 23, 2024) Electric $ 186 10.50% Second quarter of 2024 __________ (a) On March 13, 2024, ComEd filed its Refiled Grid Plan with the ICC and on March 15, 2024, ComEd filed a petition to adjust its multi-year rate plan to be aligned with ComEd’s Refiled Grid Plan. The adjusted rate plan incorporates changes in the Refiled Grid Plan, which seeks a $670 million increase in revenue requirements over four years above those granted in the ICC’s January 10, 2024, amendatory order. The requested year-over-year increases are $302 million in 2024, $89 million in 2025, $136 million in 2026 and $143 million in 2027. A final order on both the Refiled Grid Plan and the adjusted rate plan petition is expected by December 2024 with new rates effective January 1, 2025. (b) On April 26, 2024, ComEd filed its proposed Delivery Reconciliation Amount of $627 million under Rider DSPR which allows for the reconciliation of the revenue requirement in effect. The 2024 filing reconciles those rates with the actual delivery service costs incurred in 2023. Final order is expected by December 2024 and the reconciliation amount will adjust customer rates in 2025. (c) PECO requested an annual electric revenue requirement increase of $464 million, which is partially offset by a one-time credit of $64 million in 2025. (d) Reflects a three-year cumulative multi-year plan for January 1, 2024 through December 31, 2026 submitted to the DCPSC. Pepco requested total electric revenue requirement increases of $116 million, $35 million, and $35 million in 2024, 2025, and 2026, respectively. Requested revenue requirement increases will be used to recover capital investments designed to advance system-readiness and support the District of Columbia’s climate and clean energy goals. (e) Reflects a three-year cumulative multi-year plan for April 1, 2024 through March 31, 2027 submitted to the MDPSC. Pepco requested total electric revenue requirement increases of $68 million, $53 million, and $51 million effective April 1, 2024, April 1, 2025, and April 1, 2026, respectively through its surrebuttal filing made on February 23, 2024. The plan contains a proposed nine-month extension period with a requested revenue requirement increase of $14 million effective April 1, 2027 through December 31, 2027. Requested revenue requirement increases will be used to recover capital investments designed to advance system-readiness and support Maryland's climate and clean energy goals. On August 7, 2023, the MDPSC issued an order approving a settlement agreement which allows Pepco to establish a revenue deferral mechanism to recover its full Commission-authorized year 1 increase between July 1, 2024 through March 31, 2025 and extend the procedural schedule to address intervenor resource constraints.
Public Utilities Transmission Rate Filings [Table Text Block]	For 2024, the following increases/(decreases) were included in ComEd's and BGE's electric transmission formula rate updates: Registrant (a) Initial Revenue Requirement Increase Annual Reconciliation (Decrease) Total Revenue Requirement Increase Allowed Return on Rate Base (b) Allowed ROE (c) ComEd $ 32 $ (12) $ 20 8.14 % 11.50 % BGE $ 42 $ 13 $ 53 (d) 7.47 % 10.50 % __________ (a) All rates are effective June 1, 2024 - May 31, 2025, subject to review by interested parties pursuant to review protocols of ComEd's and BGE's tariffs. (b) Represents the weighted average debt and equity return on transmission rate bases. (c) The rate of return on common equity for ComEd and BGE includes a 50-basis-point incentive adder for being a member of a RTO. (d)
Capitalized Ratemaking Amounts Not Recognized [Table Text Block]	The following table presents authorized amounts capitalized for ratemaking purposes related to earnings on shareholders' investment that are not recognized for financial reporting purposes in the Registrants' Consolidated Balance Sheets. These amounts will be recognized as revenues in the related Consolidated Statements of Operations and Comprehensive Income in the periods they are billable to the Utility Registrants' customers. PECO had no related amounts at March 31, 2024 and December 31, 2023. Exelon ComEd (a) BGE (b) PHI Pepco (c) DPL (c) ACE (d) March 31, 2024 $ 106 $ 36 $ 30 $ 40 $ 27 $ 1 $ 12 December 31, 2023 110 32 33 45 34 1 10 __________ (a) Reflects ComEd's unrecognized equity returns earned for ratemaking purposes on its energy efficiency and electric distribution formula rate regulatory assets. (b) BGE's amount capitalized for ratemaking purposes primarily relates to earnings on shareholders' investment on their AMI programs and on investments in rate base included in the multi-year plan reconciliations. (c) Pepco's and DPL's authorized amounts capitalized for ratemaking purposes relate to earnings on shareholders' investment on their respective AMI programs and Energy efficiency and demand response programs, and for Pepco District of Columbia revenue decoupling program. The earnings on energy efficiency are on Pepco District of Columbia and DPL Delaware programs only. (d) ACE's authorized amounts capitalized for ratemaking purposes primarily relate to earnings on shareholders' investment on AMI programs.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Change in Contract with Customer, Asset and Liability	The following table provides a rollforward of the contract liabilities reflected in Exelon's, PHI's, Pepco's, DPL's, and ACE's Consolidated Balance Sheets for the three months ended March 31, 2024 and 2023. At March 31, 2024 and December 31, 2023, ComEd's, PECO's, and BGE's contract liabilities were immaterial. Exelon (a) PHI (a) Pepco (a) DPL ACE Balance at December 31, 2023 $ 133 $ 133 $ 107 $ 13 $ 13 Revenues recognized (2) (2) (2) — — Balance at March 31, 2024 $ 131 $ 131 $ 105 $ 13 $ 13 Exelon (a) PHI (a) Pepco (a) DPL ACE Balance at December 31, 2022 $ 101 $ 101 $ 81 $ 10 $ 10 Revenues recognized (1) (1) (1) — — Balance at March 31, 2023 $ 100 $ 100 $ 80 $ 10 $ 10 __________ (a) Revenues recognized in the three months ended March 31, 2024 and 2023, were included in the contract liabilities at December 31, 2023 and 2022, respectively.
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, 2024. 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 the Utility Registrants' gas and electric tariff sales contracts and transmission revenue contracts as they generally have an original expected duration of one year or less and, therefore, do not contain any future, unsatisfied performance obligations to be included in this disclosure. Year Exelon PHI Pepco DPL ACE 2024 $ 4 $ 4 $ 4 $ — $ — 2025 7 7 5 1 1 2026 6 6 5 1 — 2027 5 5 5 — — 2028 and thereafter 109 109 86 11 12 Total $ 131 $ 131 $ 105 $ 13 $ 13

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2024
Segment Reporting [Abstract]
Analysis and reconciliation of reportable segment information	An analysis and reconciliation of the Registrants’ reportable segment information to the respective information in the consolidated financial statements for the three months ended March 31, 2024 and 2023 is as follows: ComEd PECO BGE PHI Other (a) Intersegment Exelon Operating revenues (b) : 2024 Electric revenues $ 2,095 $ 782 $ 881 $ 1,532 $ — $ (6) $ 5,284 Natural gas revenues — 272 416 72 — (1) 759 Shared service and other revenues — — — 2 459 (461) — Total operating revenues $ 2,095 $ 1,054 $ 1,297 $ 1,606 $ 459 $ (468) $ 6,043 2023 Electric revenues $ 1,667 $ 795 $ 814 $ 1,436 $ — $ (5) $ 4,707 Natural gas revenues — 317 443 97 — (1) 856 Shared service and other revenues — — — 3 437 (440) — Total operating revenues $ 1,667 $ 1,112 $ 1,257 $ 1,536 $ 437 $ (446) $ 5,563 Intersegment revenues (c) : 2024 $ 2 $ 2 $ 2 $ 3 $ 457 $ (466) $ — 2023 3 2 3 3 434 (445) — Depreciation and amortization: 2024 $ 362 $ 104 $ 150 $ 246 $ 17 $ — $ 879 2023 338 98 167 241 16 — 860 Operating expenses: 2024 $ 1,781 $ 851 $ 967 $ 1,335 $ 472 $ (475) $ 4,931 2023 1,256 902 964 1,297 485 (447) 4,457 Interest expense, net: 2024 $ 122 $ 55 $ 50 $ 90 $ 151 $ — $ 468 2023 117 48 44 76 127 — 412 Income taxes: 2024 $ 19 $ 10 $ 24 $ 40 $ (30) $ — $ 63 2023 71 4 52 34 (27) — 134 Net income (loss): 2024 $ 193 $ 149 $ 264 $ 168 $ (116) $ — $ 658 2023 241 166 200 155 (93) — 669 Capital expenditures: 2024 $ 594 $ 361 $ 324 $ 453 $ 35 $ — $ 1,767 2023 617 335 350 561 18 — 1,881 Total assets: March 31, 2024 $ 43,132 $ 16,116 $ 14,444 $ 27,535 $ 6,376 $ (4,392) $ 103,211 December 31, 2023 42,827 15,595 14,184 26,903 6,374 (4,337) 101,546 __________ (a) Other primarily includes Exelon’s corporate operations, shared service entities, and other financing and investment activities. (b) Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in Taxes other than income taxes in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 14 — Supplemental Financial Information for additional information on total utility taxes. (c) See Note 15 — Related Party Transactions for additional information on intersegment revenues. PHI: Pepco DPL ACE Other (a) Intersegment PHI Operating revenues (b) : 2024 Electric revenues $ 759 $ 419 $ 358 $ — $ (4) $ 1,532 Natural gas revenues — 72 — — — 72 Shared service and other revenues — — — 109 (107) 2 Total operating revenues $ 759 $ 491 $ 358 $ 109 $ (111) $ 1,606 2023 Electric revenues $ 710 $ 377 $ 353 $ — $ (4) $ 1,436 Natural gas revenues — 97 — — — 97 Shared service and other revenues — — — 102 (99) 3 Total operating revenues $ 710 $ 474 $ 353 $ 102 $ (103) $ 1,536 Intersegment revenues (c) : 2024 $ 2 $ 2 $ 1 $ 109 $ (111) $ 3 2023 1 2 1 102 (103) 3 Depreciation and amortization: 2024 $ 107 $ 61 $ 74 $ 4 $ — $ 246 2023 108 60 67 6 — 241 Operating expenses: 2024 $ 640 $ 391 $ 303 $ 111 $ (110) $ 1,335 2023 610 388 298 104 (103) 1,297 Interest expense, net: 2024 $ 45 $ 22 $ 20 $ 3 $ — $ 90 2023 39 17 16 4 — 76 Income taxes: 2024 $ 14 $ 17 $ 11 $ (2) $ — $ 40 2023 12 12 11 (1) — 34 Net income (loss): 2024 $ 75 $ 66 $ 29 $ (2) $ — $ 168 2023 65 60 33 (3) — 155 Capital expenditures: 2024 $ 229 $ 134 $ 89 $ 1 $ — $ 453 2023 264 134 161 2 — 561 Total assets: March 31, 2024 $ 11,585 $ 6,291 $ 5,253 $ 4,718 $ (312) $ 27,535 December 31, 2023 11,194 5,966 5,157 4,627 (41) 26,903 __________ (a) Other primarily includes PHI’s corporate operations, shared service entities, and other financing and investment activities. (b) Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in Taxes other than income taxes in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 14 — Supplemental Financial Information for additional information on total utility taxes. (c) Includes intersegment revenues with ComEd, PECO, and BGE, which are eliminated at Exelon.
Schedule of Revenue by Major Customers by Reporting Segments	The following tables disaggregate the Registrants' revenues 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. For the Utility Registrants, the disaggregation of revenues reflects the two primary utility services of electric sales and natural gas sales (where applicable), with further disaggregation of these tariff sales provided by major customer groups. Exelon’s disaggregated revenues are consistent with the Utility Registrants, but exclude any intercompany revenues. Three Months Ended March 31, 2024 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 918 $ 520 $ 534 $ 775 $ 345 $ 256 $ 174 Small commercial & industrial 594 126 90 158 46 62 50 Large commercial & industrial 320 57 132 340 262 29 49 Public authorities & electric railroads 17 7 7 20 11 4 5 Other (a) 227 74 93 192 64 63 67 Total electric revenues (b) $ 2,076 $ 784 $ 856 $ 1,485 $ 728 $ 414 $ 345 Natural gas revenues Residential $ — $ 193 $ 271 $ 46 $ — $ 46 $ — Small commercial & industrial — 64 47 17 — 17 — Large commercial & industrial — — 72 2 — 2 — Transportation — 8 — 5 — 5 — Other (c) — 7 5 2 — 2 — Total natural gas revenues (d) $ — $ 272 $ 395 $ 72 $ — $ 72 $ — Total revenues from contracts with customers $ 2,076 $ 1,056 $ 1,251 $ 1,557 $ 728 $ 486 $ 345 Other revenues Revenues from alternative revenue programs $ 19 $ (2) $ 43 $ 46 $ 29 $ 4 $ 13 Other electric revenues (e) — — 2 3 2 1 — Other natural gas revenues (e) — — 1 — — — — Total other revenues $ 19 $ (2) $ 46 $ 49 $ 31 $ 5 $ 13 Total revenues for reportable segments $ 2,095 $ 1,054 $ 1,297 $ 1,606 $ 759 $ 491 $ 358 Three Months Ended March 31, 2023 Revenues from contracts with customers ComEd PECO BGE PHI Pepco DPL ACE Electric revenues Residential $ 836 $ 519 $ 434 $ 639 $ 283 $ 210 $ 146 Small commercial & industrial 361 135 92 160 39 62 59 Large commercial & industrial 84 65 149 378 282 33 63 Public authorities & electric railroads 10 8 7 17 8 4 5 Other (a) 217 68 96 176 56 58 63 Total electric revenues (b) $ 1,508 $ 795 $ 778 $ 1,370 $ 668 $ 367 $ 336 Natural gas revenues Residential $ — $ 223 $ 278 $ 60 $ — $ 60 $ — Small commercial & industrial — 75 41 26 — 26 — Large commercial & industrial — 1 70 1 — 1 — Transportation — 8 — 4 — 4 — Other (c) — 9 19 6 — 6 — Total natural gas revenues (d) $ — $ 316 $ 408 $ 97 $ — $ 97 $ — Total revenues from contracts with customers $ 1,508 $ 1,111 $ 1,186 $ 1,467 $ 668 $ 464 $ 336 Other revenues Revenues from alternative revenue programs $ 153 $ (4) $ 65 $ 65 $ 39 $ 9 $ 17 Other electric revenues (e) 6 4 4 4 3 1 — Other natural gas revenues (e) — 1 2 — — — — Total other revenues $ 159 $ 1 $ 71 $ 69 $ 42 $ 10 $ 17 Total revenues for reportable segments $ 1,667 $ 1,112 $ 1,257 $ 1,536 $ 710 $ 474 $ 353 __________ (a) Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue. (b) Includes operating revenues from affiliates in 2024 and 2023 respectively of: • $2 million, $3 million at ComEd • $2 million, $1 million at PECO • $1 million, $2 million at BGE • $3 million, $3 million at PHI • $2 million, $1 million at Pepco • $2 million, $2 million at DPL • $1 million, $1 million at ACE (c) Includes revenues from off-system natural gas sales. (d) Includes operating revenues from affiliates in 2024 and 2023 respectively of: • less than $1 million, $1 million at PECO • $1 million, $1 million at BGE (e) Includes late payment charge revenues.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	3 Months Ended
	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Allowance for credit loss rollforward	The following tables present the rollforward of Allowance for Credit Losses on Customer Accounts Receivable. Three Months Ended March 31, 2024 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at December 31, 2023 $ 317 $ 69 $ 95 $ 46 $ 107 $ 52 $ 19 $ 36 Plus: Current period provision for expected credit losses (a)(b)(c) 79 22 23 15 19 12 3 4 Less: Write-offs (d) , net of recoveries (e) 50 9 11 9 21 12 5 4 Balance at March 31, 2024 $ 346 $ 82 $ 107 $ 52 $ 105 $ 52 $ 17 $ 36 Three Months Ended March 31, 2023 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at December 31, 2022 $ 327 $ 59 $ 105 $ 54 $ 109 $ 47 $ 21 $ 41 Plus: Current period provision for expected credit losses 108 22 39 30 17 9 7 1 Less: Write-offs, net of recoveries 46 7 14 11 14 7 2 5 Balance at March 31, 2023 $ 389 $ 74 $ 130 $ 73 $ 112 $ 49 $ 26 $ 37 _________ (a) For PECO, the change in current period provision for expected credit losses is primarily a result of decreased receivable balances. (b) For BGE and DPL, the change in the current period provision for expected credit losses is primarily a result of changes in customer risk profile. (c) For ACE, the change in current period provision for expected credit losses is primarily a result of increased receivable balances. (d) For Pepco and DPL, the change in write-offs is primarily attributable to unfavorable customer payment behavior. (e) Recoveries were not material to the Registrants. The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable. Three Months Ended March 31, 2024 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at December 31, 2023 $ 82 $ 17 $ 8 $ 7 $ 50 $ 28 $ 8 $ 14 Plus: Current period provision for expected credit losses 18 3 5 2 8 7 — 1 Less: Write-offs, net of recoveries (a) 4 1 — 2 1 — — 1 Balance at March 31, 2024 $ 96 $ 19 $ 13 $ 7 $ 57 $ 35 $ 8 $ 14 Three Months Ended March 31, 2023 Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at December 31, 2022 $ 82 $ 17 $ 9 $ 10 $ 46 $ 25 $ 7 $ 14 Plus: Current period provision for expected credit losses 14 2 3 4 5 3 1 1 Less: Write-offs, net of recoveries 5 1 1 2 1 — — 1 Balance at March 31, 2023 $ 91 $ 18 $ 11 $ 12 $ 50 $ 28 $ 8 $ 14 _________ (a) Recoveries were not material to the Registrants.
Unbilled customer revenue	The following table provides additional information about unbilled customer revenues recorded in the Registrants' Consolidated Balance Sheets at March 31, 2024 and December 31, 2023. Unbilled customer revenues (a) Exelon ComEd PECO BGE PHI Pepco DPL ACE March 31, 2024 $ 849 $ 344 $ 138 $ 171 $ 196 $ 96 $ 53 $ 47 December 31, 2023 991 351 185 208 247 109 64 74 __________ (a) Unbilled customer revenues are classified in Customer accounts receivable, net in the Registrants' Consolidated Balance Sheets.
Purchases of accounts receivable	The Utility Registrants are required, under separate legislation and regulations in Illinois, Pennsylvania, Maryland, District of Columbia, Delaware, and New Jersey, to purchase certain receivables from alternative retail electric and, as applicable, natural gas suppliers that participate in the utilities' consolidated billing. The following table presents the total receivables purchased. Total receivables purchased Exelon ComEd PECO BGE PHI Pepco DPL ACE Three months ended March 31, 2024 $ 1,060 $ 235 $ 297 $ 219 $ 309 $ 194 $ 60 $ 55 Three months ended March 31, 2023 1,108 240 309 245 314 210 56 48

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of 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, 2024 (a) Exelon ComEd (b) PECO (c) BGE (b) PHI Pepco DPL ACE U.S. Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 6.4 7.8 (0.6) 6.3 6.4 6.2 6.2 7.1 Plant basis differences (3.8) (0.9) (12.2) (1.2) (0.9) (1.3) (1.1) 0.1 Excess deferred tax amortization (14.7) (18.9) (2.3) (17.5) (6.8) (9.9) (5.4) (1.3) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — — (0.1) — (0.1) (0.1) Tax credits (0.4) (0.3) — (0.4) (0.3) (0.3) (0.3) (0.3) Other 0.3 0.4 0.4 0.1 (0.1) — 0.2 1.0 Effective income tax rate 8.7 % 9.0 % 6.3 % 8.3 % 19.2 % 15.7 % 20.5 % 27.5 % Three Months Ended March 31, 2023 (a) Exelon ComEd PECO (c) BGE PHI Pepco DPL ACE U.S. Federal statutory rate 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % 21.0 % Increase (decrease) due to: State income taxes, net of federal income tax benefit 6.0 7.9 (1.4) 6.4 6.0 5.4 6.3 6.9 Plant basis differences (4.0) (0.3) (15.2) (0.7) (1.8) (2.5) (1.0) (0.9) Excess deferred tax amortization (6.3) (5.7) (2.4) (5.4) (7.0) (8.4) (8.8) (2.0) Amortization of investment tax credit, including deferred taxes on basis difference (0.1) (0.1) — (0.1) (0.1) — (0.1) (0.1) Tax credits (0.5) (0.3) — (0.5) (0.4) (0.4) (0.4) (0.3) Other 0.6 0.3 0.4 (0.1) 0.3 0.5 (0.3) 0.4 Effective income tax rate 16.7 % 22.8 % 2.4 % 20.6 % 18.0 % 15.6 % 16.7 % 25.0 % __________ (a) Positive percentages represent income tax expense. Negative percentages represent income tax benefit. (b) For ComEd, the lower effective tax rate is primarily due to CEJA which resulted in the acceleration of certain income tax benefits. For BGE, the lower effective tax rate is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. (c)
Schedule of Unrecognized Tax Benefits Roll Forward	Exelon, PHI and ACE have the following unrecognized tax benefits at March 31, 2024 and December 31, 2023. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material. Exelon (a) PHI ACE March 31, 2024 $ 95 $ 51 $ 15 December 31, 2023 94 51 15 __________ (a)

Retirement Benefits (Tables)

Retirement Benefits (Tables)	3 Months Ended
	Mar. 31, 2024
Retirement Benefits [Abstract]
Calculation of Net Periodic Benefit Costs	A portion of the net periodic benefit cost for all plans is capitalized within the Consolidated Balance Sheets. The following table presents the components of Exelon's net periodic benefit costs, prior to capitalization, for the three months ended March 31, 2024 and 2023. Pension Benefits OPEB Three Months Ended March 31, Three Months Ended March 31, 2024 2023 2024 2023 Components of net periodic benefit cost Service cost $ 42 $ 39 $ 7 $ 6 Interest cost 141 145 24 25 Expected return on assets (184) (189) (21) (21) Amortization of: Prior service cost (credit) 1 1 (2) (2) Actuarial loss 53 41 — — Net periodic benefit cost $ 53 $ 37 $ 8 $ 8
Allocated Portion of Pension and Postretirement Benefit Costs	The amounts below represent the Registrants' allocated pension and OPEB costs. For Exelon, the service cost component is included in Operating and maintenance expense and Property, plant, and equipment, net while the non-service cost components are included in Other, net and Regulatory assets. For the Utility Registrants, which apply multi-employer accounting, the service cost and non-service cost components are included in Operating and maintenance expense and Property, plant, and equipment, net in their consolidated financial statements. Three Months Ended March 31, Pension and OPEB Costs (Benefit) 2024 2023 Exelon $ 61 $ 45 ComEd 17 6 PECO — (3) BGE 15 14 PHI 23 24 Pepco 9 8 DPL 4 4 ACE 3 4
Defined Contribution Savings Plans	The Registrants participate in a 401(k) defined contribution savings plan that is sponsored by Exelon. The plan is qualified under applicable sections of the IRC and allows employees to contribute a portion of their pre-tax and/or after-tax income in accordance with specified guidelines. All Registrants match a percentage of the employee contributions up to certain limits. The following table presents the employer contributions and employer matching contributions to the savings plan for the three months ended March 31, 2024 and 2023. Three Months Ended March 31, Savings Plan Employer Contributions 2024 2023 Exelon $ 22 $ 21 ComEd 10 9 PECO 3 3 BGE 3 2 PHI 2 3 Pepco 1 1 DPL 1 1 ACE — —

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following table provides a summary of the Utility Registrants’ primary derivative hedging instruments, listed by commodity and accounting treatment. Registrant Commodity Accounting Treatment Hedging Instrument ComEd Electricity NPNS Fixed price contracts based on all requirements in the IPA procurement plans. Electricity Changes in fair value of economic hedge recorded to an offsetting regulatory asset or liability (a) 20-year floating-to-fixed energy swap contracts beginning June 2012 based on the renewable energy resource procurement requirements in the Illinois Settlement Legislation of approximately 1.3 million MWhs per year. PECO Electricity NPNS Fixed price contracts for default supply requirements through full requirements contracts. Gas NPNS Fixed price contracts to cover about 10% of planned natural gas purchases in support of projected firm sales. BGE Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. Gas NPNS Fixed price contracts for between 10-20% of forecasted system supply requirements for flowing (i.e., non-storage) gas for the November through March period. Pepco Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. DPL Electricity NPNS Fixed price contracts for all SOS requirements through full requirements contracts. Gas NPNS Fixed and index priced contracts through full requirements contracts. Gas Changes in fair value of economic hedge recorded to an offsetting regulatory asset or liability (b) Exchange traded future contracts for up to 50% of estimated monthly purchase requirements each month, including purchases for storage injections. ACE Electricity NPNS Fixed price contracts for all BGS requirements through full requirements contracts. __________ (a) See Note 3 — Regulatory Matters of the 2023 Form 10-K for additional information. (b) The fair value of the DPL economic hedge is not material at March 31, 2024 and December 31, 2023.
Schedule of Interest Rate Derivatives	Below is a summary of the interest rate hedge balances at March 31, 2024 and December 31, 2023 . March 31, 2024 Derivatives Designated Economic Hedges Total Other deferred debits (noncurrent assets) $ 2 $ — $ 2 Total derivative assets 2 — 2 Mark-to-market derivative liabilities (noncurrent liabilities) (1) — (1) Total mark-to-market derivative liabilities (1) — (1) Total mark-to-market derivative net assets $ 1 $ — $ 1 December 31, 2023 Derivatives Designated Economic Hedges Total Other current assets $ 11 $ 1 $ 12 Total derivative assets 11 1 12 Mark-to-market derivative liabilities (current liabilities) (24) (22) (46) Total mark-to-market derivative liabilities (24) (22) (46) Total mark-to-market derivative net assets $ (13) $ (21) $ (34)
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table provides the notional amounts outstanding held by Exelon at March 31, 2024 and December 31, 2023. March 31, 2024 December 31, 2023 5-year maturity floating-to-fixed swaps $ 145 $ 655 10-year maturity floating-to-fixed swaps 145 655 Total $ 290 $ 1,310
Economic Hedges (Commodity Price Risk)	Exelon Corporate recognized the following net pre-tax mark-to-market (losses) which are also recognized in Net fair value changes related to derivatives in Exelon's Consolidated Statements of Cash Flows. Three Months Ended March 31, 2024 Three Months Ended March 31, 2023 Income Statement Location Gain (Loss) Gain (Loss) Electric operating revenues $ — $ 1 Interest expense — (1) Total $ — $ —
Cash collateral held with external counterparties	The following table reflects the Registrants' cash collateral held from external counterparties, which is recorded in Other current liabilities on their respective Consolidated Balance Sheets, as of March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Exelon $ 156 $ 148 ComEd 154 146 PECO (a) — — BGE 1 1 PHI 1 1 Pepco (b) — 1 DPL 1 — ACE 1 — __________ (a) PECO had less than one million in cash collateral held with external parties at March 31, 2024 and December 31, 2023. (b)

Debt and Credit Agreements (A_2

Debt and Credit Agreements (All Registrants) (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Commercial Paper Borrowings	The following table reflects the Registrants' commercial paper programs supported by the revolving credit agreements at March 31, 2024 and December 31, 2023. Outstanding Commercial Average Interest Rate on Commercial Paper Issuer March 31, 2024 December 31, 2023 March 31, 2024 December 31, 2023 Exelon (a) $ 1,307 $ 1,624 5.53 % 5.58 % ComEd $ 330 $ 202 5.43 % 5.53 % PECO $ — $ 165 — % 5.57 % BGE $ 406 $ 336 5.57 % 5.59 % PHI (b) $ — $ 394 — % 5.60 % Pepco $ — $ 132 — % 5.59 % DPL $ — $ 63 — % 5.60 % ACE $ — $ 199 — % 5.60 % __________ (a) Exelon Corporate had $571 million and $527 million in outstanding commercial paper borrowings at March 31, 2024 and December 31, 2023, respectively. (b) Represents the consolidated amounts of Pepco, DPL, and ACE.
Schedule of Revolving Credit Agreements	Exelon Corporate and the Utility Registrants each have a 5-year revolving credit facility. The following table reflects the credit agreements: Borrower Aggregate Bank Commitment Interest Rate Exelon Corporate $ 900 SOFR plus 1.275 % ComEd $ 1,000 SOFR plus 1.000 % PECO $ 600 SOFR plus 0.900 % BGE $ 600 SOFR plus 0.900 % Pepco $ 300 SOFR plus 1.075 % DPL $ 300 SOFR plus 1.000 % ACE $ 300 SOFR plus 1.000 %
Schedule of Long-term Debt Instruments	During the three months ended March 31, 2024, the following long-term debt was issued: Company Type Interest Rate Maturity Amount Use of Proceeds Exelon Notes 5.15% March 15, 2029 $650 Repay Exelon SMBC Term Loan, outstanding commercial paper, and for general corporate purposes. Exelon Notes 5.45% March 15, 2034 $650 Repay Exelon SMBC Term Loan, outstanding commercial paper, and for general corporate purposes. Exelon Notes 5.60% March 15, 2053 $400 Repay Exelon SMBC Term Loan, outstanding commercial paper, and for general corporate purposes. Pepco First Mortgage Bonds 5.20% March 15, 2034 $375 Refinance existing indebtedness, refinance outstanding commercial paper obligations, and for general corporate purposes. Pepco First Mortgage Bonds 5.50% March 15, 2054 $300 Refinance existing indebtedness, refinance outstanding commercial paper obligations, and for general corporate purposes. DPL First Mortgage Bonds 5.24% March 20, 2034 $100 Repay existing indebtedness and for general corporate purposes. DPL First Mortgage Bonds 5.55% March 20, 2054 $75 Repay existing indebtedness and for general corporate purposes. ACE (a) First Mortgage Bonds 5.55% March 20, 2054 $75 Repay existing indebtedness and for general corporate purposes. __________ (a) On March 20, 2024, ACE entered into a purchase agreement of First Mortgage Bonds of $75 million and $100 million at 5.29% and 5.49% due on August 28, 2034 and August 28, 2039, respectively. The closing date of the issuance is expected to occur in August 2024.

Fair Value of Financial Asset_2

Fair Value of Financial Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value of Financial Liabilities Recorded at Amortized Cost	Fair Value of Financial Liabilities Recorded at Amortized Cost The following tables present the carrying amounts and fair values of the Registrants’ short-term liabilities, long-term debt, and trust preferred securities (long-term debt to financing trusts or junior subordinated debentures) as of March 31, 2024 and December 31, 2023. The Registrants have no financial liabilities measured using the NAV practical expedient. The carrying amounts of the Registrants’ short-term liabilities as presented in their Consolidated Balance Sheets are representative of their fair value (Level 2) because of the short-term nature of these instruments. March 31, 2024 December 31, 2023 Carrying Amount Fair Value Carrying Amount Fair Value Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Long-Term Debt, including amounts due within one year (a) Exelon $ 42,774 $ — $ 34,426 $ 3,613 $ 38,039 $ 41,095 $ — $ 33,804 $ 3,442 $ 37,246 ComEd 11,487 — 9,910 — 9,910 11,486 — 10,210 — 10,210 PECO 5,134 — 4,391 — 4,391 5,134 — 4,562 — 4,562 BGE 4,602 — 4,015 — 4,015 4,602 — 4,145 — 4,145 PHI 9,153 — 4,356 3,613 7,969 8,648 — 4,160 3,442 7,602 Pepco 4,359 — 2,549 1,570 4,119 4,096 — 2,311 1,600 3,911 DPL 2,254 — 668 1,274 1,942 2,080 — 694 1,134 1,828 ACE 1,909 — 929 768 1,697 1,833 — 939 708 1,647 Long-Term Debt to Financing Trusts Exelon $ 390 $ — $ — $ 392 $ 392 $ 390 $ — $ — $ 390 $ 390 ComEd 205 — — 209 209 205 — — 208 208 PECO 184 — — 183 183 184 — — 182 182 __________ (a)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	Recurring Fair Value Measurements The following tables present assets and liabilities measured and recorded at fair value in the Registrants' Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy at March 31, 2024 and December 31, 2023. Exelon and the Utility Registrants have immaterial and no financial assets or liabilities measured using the NAV practical expedient, respectively: Exelon At March 31, 2024 At December 31, 2023 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 883 $ — $ — $ 883 $ 618 $ — $ — $ 618 Rabbi trust investments Cash equivalents 68 — — 68 67 — — 67 Mutual funds 57 — — 57 53 — — 53 Fixed income — 7 — 7 — 7 — 7 Life insurance contracts — 65 43 108 — 61 43 104 Rabbi trust investments subtotal 125 72 43 240 120 68 43 231 Interest rate derivative assets Derivatives designated as hedging instruments — 2 — 2 — 11 — 11 Economic hedges — — — — — 1 — 1 Interest rate derivative assets subtotal — 2 — 2 — 12 — 12 Total assets 1,008 74 43 1,125 738 80 43 861 Liabilities Commodity derivative liabilities — — (108) (108) — — (133) (133) Interest rate derivative liabilities Derivatives designated as hedging instruments — (1) — (1) — (24) — (24) Economic hedges — — — — — (22) — (22) Interest rate derivative liabilities subtotal — (1) — (1) — (46) — (46) Deferred compensation obligation — (75) — (75) — (75) — (75) Total liabilities — (76) (108) (184) — (121) (133) (254) Total net assets (liabilities) $ 1,008 $ (2) $ (65) $ 941 $ 738 $ (41) $ (90) $ 607 __________ (a) Exelon excludes cash of $271 million and $334 million at March 31, 2024 and December 31, 2023, respectively, and restricted cash of $154 million and $149 million at March 31, 2024 and December 31, 2023, respectively, and includes long-term restricted cash of $99 million and $174 million at March 31, 2024 and December 31, 2023, respectively, which is reported in Other deferred debits and other assets in the Consolidated Balance Sheets. ComEd, PECO, and BGE ComEd PECO BGE At March 31, 2024 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 398 $ — $ — $ 398 $ 14 $ — $ — $ 14 $ — $ — $ — $ — Rabbi trust investments Mutual funds — — — — 10 — — 10 10 — — 10 Life insurance contracts — — — — — 19 — 19 — — — — Rabbi trust investments subtotal — — — — 10 19 — 29 10 — — 10 Total assets 398 — — 398 24 19 — 43 10 — — 10 Liabilities Commodity derivative liabilities (b) — — (108) (108) — — — — — — — — Deferred compensation obligation — (9) — (9) — (9) — (9) — (4) — (4) Total liabilities — (9) (108) (117) — (9) — (9) — (4) — (4) Total net assets (liabilities) $ 398 $ (9) $ (108) $ 281 $ 24 $ 10 $ — $ 34 $ 10 $ (4) $ — $ 6 ComEd PECO BGE At December 31, 2023 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 453 $ — $ — $ 453 $ 9 $ — $ — $ 9 $ — $ — $ — $ — Rabbi trust investments Mutual funds — — — — 9 — — 9 9 — — 9 Life insurance contracts — — — — — 18 — 18 — — — — Rabbi trust investments subtotal — — — — 9 18 — 27 9 — — 9 Total assets 453 — — 453 18 18 — 36 9 — — 9 Liabilities Commodity derivative liabilities (b) — — (133) (133) — — — — — — — — Deferred compensation obligation — (8) — (8) — (8) — (8) — (4) — (4) Total liabilities — (8) (133) (141) — (8) — (8) — (4) — (4) Total net assets (liabilities) $ 453 $ (8) $ (133) $ 312 $ 18 $ 10 $ — $ 28 $ 9 $ (4) $ — $ 5 __________ (a) ComEd excludes cash of $75 million and $86 million at March 31, 2024 and December 31, 2023, respectively, and restricted cash of $154 million and $147 million at March 31, 2024 and December 31, 2023, respectively. Additionally, ComEd includes long-term restricted cash of $99 million and $174 million at March 31, 2024 and December 31, 2023, respectively, which is reported in Other deferred debits and other assets in the Consolidated Balance Sheets. PECO excludes cash of $34 million and $42 million at March 31, 2024 and December 31, 2023, respectively. BGE excludes cash of $27 million and $47 million at March 31, 2024 and December 31, 2023, respectively, and restricted cash of zero and $1 million at March 31, 2024 and December 31, 2023, respectively. (b) The Level 3 balance consists of the current and noncurrent liability of $29 million and $79 million, respectively, at March 31, 2024 and $27 million and $106 million, respectively, at December 31, 2023 related to floating-to-fixed energy swap contracts with unaffiliated suppliers. PHI, Pepco, DPL, and ACE At March 31, 2024 At December 31, 2023 PHI Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 438 $ — $ — $ 438 $ 107 $ — $ — $ 107 Rabbi trust investments Cash equivalents 65 — — 65 64 — — 64 Mutual funds 9 — — 9 9 — — 9 Fixed income — 7 — 7 — 7 — 7 Life insurance contracts — 22 41 63 — 21 41 62 Rabbi trust investments subtotal 74 29 41 144 73 28 41 142 Total assets 512 29 41 582 180 28 41 249 Liabilities Deferred compensation obligation — (12) — (12) — (13) — (13) Total liabilities — (12) — (12) — (13) — (13) Total net assets $ 512 $ 17 $ 41 $ 570 $ 180 $ 15 $ 41 $ 236 Pepco DPL ACE At March 31, 2024 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 192 $ — $ — $ 192 $ 241 $ — $ — $ 241 $ — $ — $ — $ — Rabbi trust investments Cash equivalents 64 — — 64 — — — — — — — — Life insurance contracts — 22 41 63 — — — — — — — — Rabbi trust investments subtotal 64 22 41 127 — — — — — — — — Total assets 256 22 41 319 241 — — 241 — — — — Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 256 $ 21 $ 41 $ 318 $ 241 $ — $ — $ 241 $ — $ — $ — $ — Pepco DPL ACE At December 31, 2023 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Cash equivalents (a) $ 23 $ — $ — $ 23 $ 1 $ — $ — $ 1 $ — $ — $ — $ — Rabbi trust investments Cash equivalents 63 — — 63 — — — — — — — — Life insurance contracts — 21 41 62 — — — — — — — — Rabbi trust investments subtotal 63 21 41 125 — — — — — — — — Total assets 86 21 41 148 1 — — 1 — — — — Liabilities Deferred compensation obligation — (1) — (1) — — — — — — — — Total liabilities — (1) — (1) — — — — — — — — Total net assets $ 86 $ 20 $ 41 $ 147 $ 1 $ — $ — $ 1 $ — $ — $ — $ — __________ (a)
Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis	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, 2024 and 2023: Exelon ComEd PHI and Pepco Three Months Ended March 31, 2024 Total Commodity Life Insurance Contracts Balance at December 31, 2023 $ (90) $ (133) $ 41 Total realized / unrealized gains (losses) Included in net income (a) — — — Included in regulatory assets/liabilities 25 25 (b) — Balance at March 31, 2024 $ (65) $ (108) (c) $ 41 The amount of total gains included in income attributed to the change in unrealized gains related to assets and liabilities at March 31, 2024 $ — $ — $ — Exelon ComEd PHI and Pepco Three Months Ended March 31, 2023 Total Commodity Life Insurance Contracts Balance at December 31, 2022 $ (44) $ (84) $ 40 Total realized / unrealized gains (losses) Included in net income (a) 1 — 1 Included in regulatory assets/liabilities (14) (14) (b) — Balance at March 31, 2023 $ (57) $ (98) $ 41 The amount of total gains included in income attributed to the change in unrealized gain related to assets and liabilities at March 31, 2023 $ 1 $ — $ 1 __________ (a) Classified in Operating and maintenance expense in the Consolidated Statements of Operations and Comprehensive Income. (b) Includes $13 million of increases in fair value and an increase for realized gains due to settlements of $12 million recorded in Purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended March 31, 2024. Includes $25 million of decreases in fair value and an increase for realized losses due to settlements of $11 million recorded in Purchased power expense associated with floating-to-fixed energy swap contracts with unaffiliated suppliers for the three months ended March 31, 2023. (c)
Fair Value Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis, Valuation Technique	Commodity Derivatives (Exelon and ComEd) The table below discloses the significant unobservable inputs to the forward curve used to value mark-to-market derivatives. Type of trade Fair Value at March 31, 2024 Fair Value at December 31, 2023 Valuation Unobservable 2024 Range & Arithmetic Average 2023 Range & Arithmetic Average Commodity derivatives $ (108) $ (133) Discounted Forward power price (a) $22.68 - $84.62 $46.94 $30.27 - $73.71 $43.35 ________ (a) An increase to the forward power price would increase the fair value.

Commitments and Contingencies_2

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
PHI Merger Commitments	The following amounts represent total commitment costs that have been recorded since the acquisition date and the total remaining obligations for Exelon, PHI, Pepco, DPL, and ACE at March 31, 2024: Description Exelon PHI Pepco DPL ACE Total commitments $ 513 $ 320 $ 120 $ 89 $ 111 Remaining commitments (a) 35 31 28 2 1 __________ (a) Remaining commitments extend through 2026 and include escrow funds, charitable contributions, and rate credits.
Commercial Commitments	The Registrants’ commercial commitments at March 31, 2024, representing commitments potentially triggered by future events were as follows: Expiration within Total 2024 2025 2026 2027 2028 2029 and beyond Exelon Letters of credit (a) $ 32 $ 24 $ 8 $ — $ — $ — $ — Surety bonds (b) 194 181 13 — — — — Financing trust guarantees (c) 378 — — — — 78 300 Guaranteed lease residual values (d) 25 — 3 5 4 6 7 Total commercial commitments $ 629 $ 205 $ 24 $ 5 $ 4 $ 84 $ 307 ComEd Letters of credit (a) $ 17 $ 14 $ 3 $ — $ — $ — $ — Surety bonds (b) 36 34 2 — — — — Financing trust guarantees (c) 200 — — — — — 200 Total commercial commitments $ 253 $ 48 $ 5 $ — $ — $ — $ 200 PECO Letters of credit (a) $ 3 $ — $ 3 $ — $ — $ — $ — Surety bonds (b) 2 1 1 — — — — Financing trust guarantees (c) 178 — — — — 78 100 Total commercial commitments $ 183 $ 1 $ 4 $ — $ — $ 78 $ 100 BGE Letters of credit (a) $ 7 $ 7 $ — $ — $ — $ — $ — Surety bonds (b) 3 2 1 — — — — Total commercial commitments $ 10 $ 9 $ 1 $ — $ — $ — $ — PHI Surety bonds (b) $ 96 $ 91 $ 5 $ — $ — $ — $ — Guaranteed lease residual values (d) 25 — 3 5 4 6 7 Total commercial commitments $ 121 $ 91 $ 8 $ 5 $ 4 $ 6 $ 7 Pepco Surety bonds (a) $ 85 $ 84 $ 1 $ — $ — $ — $ — Guaranteed lease residual values (d) 8 — 1 2 1 2 2 Total commercial commitments $ 93 $ 84 $ 2 $ 2 $ 1 $ 2 $ 2 DPL Surety bonds (b) $ 6 $ 3 $ 3 $ — $ — $ — $ — Guaranteed lease residual values (d) 10 — 1 2 2 2 3 Total commercial commitments $ 16 $ 3 $ 4 $ 2 $ 2 $ 2 $ 3 ACE Surety bonds (b) $ 5 $ 4 $ 1 $ — $ — $ — $ — Guaranteed lease residual values (d) 7 — 1 1 1 2 2 Total commercial commitments $ 12 $ 4 $ 2 $ 1 $ 1 $ 2 $ 2 __________ (a) Exelon and certain of its subsidiaries maintain non-debt letters of credit to provide credit support for certain transactions as requested by third parties. (b) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds. Historically, payments under the guarantees have not been made and the likelihood of payments being required is remote. (c) Reflects guarantee of ComEd and PECO securities held by ComEd Financing III, PECO Trust III, and PECO Trust IV. (d) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The lease term associated with these assets ranges from 1 to 9 years. The maximum potential obligation at the end of the minimum lease term would be $57 million guaranteed by Exelon and PHI, of which $19 million, $22 million, and $16 million is guaranteed by Pepco, DPL, and ACE, respectively. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote.
Accrued environmental liabilities	At March 31, 2024 and December 31, 2023, the Registrants had accrued the following undiscounted amounts for environmental liabilities in Accrued expenses, Other current liabilities, and Other deferred credits and other liabilities in their respective Consolidated Balance Sheets: March 31, 2024 December 31, 2023 Total Environmental Portion of Total Related to Total Environmental Portion of Total Related to Exelon $ 413 $ 328 $ 428 $ 338 ComEd 293 292 303 302 PECO 27 25 27 25 BGE 14 11 14 11 PHI 76 — 81 — Pepco 74 — 79 — DPL 1 — 1 — ACE 1 — 1 —

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2024
Changes in Accumulated Other Comprehensive Income [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Income (Loss)	The following table presents changes in Exelon's AOCI, net of tax, by component: Three Months Ended March 31, 2024 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Total Balance at December 31, 2023 $ (3) $ (723) $ (726) OCI before reclassifications 34 (24) 10 Amounts reclassified from AOCI (1) 5 4 Net current-period OCI $ 33 $ (19) $ 14 Balance at March 31, 2024 $ 30 $ (742) $ (712) Three Months Ended March 31, 2023 Cash Flow Hedges Pension and Non-Pension Postretirement Benefit Plan Items (a) Total Balance at December 31, 2022 $ 2 $ (640) $ (638) OCI before reclassifications 6 (10) (4) Amounts reclassified from AOCI — 3 3 Net current-period OCI $ 6 $ (7) $ (1) Balance at March 31, 2023 $ 8 $ (647) $ (639) __________ (a)
Schedule of Income Taxes Allocated to Other Comprehensive Income (Loss) Components	The following table presents Income tax benefit (expense) allocated to each component of Exelon's Other comprehensive income (loss): Three Months Ended March 31, 2024 2023 Pension and non-pension postretirement benefit plans: Actuarial losses reclassified to periodic benefit cost $ (2) $ (1) Pension and non-pension postretirement benefit plans valuation adjustments 8 3 Unrealized gains on cash flow hedges (10) (1)

Supplemental Financial Inform_2

Supplemental Financial Information (Tables)	3 Months Ended
	Mar. 31, 2024
Supplemental Financial Information [Abstract]
Taxes Other Than Income Taxes	The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Operations and Comprehensive Income: Taxes other than income taxes Exelon ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2024 Utility taxes (a) $ 229 $ 75 $ 41 $ 31 $ 82 $ 74 $ 8 $ — Property 105 9 4 53 38 26 11 1 Payroll 34 9 5 5 7 2 1 1 Three Months Ended March 31, 2023 Utility taxes (a) $ 220 $ 74 $ 40 $ 29 $ 77 $ 68 $ 8 $ 1 Property 99 10 4 50 35 24 11 — Payroll 32 7 5 5 7 2 1 1 _________ (a) The Registrants' utility taxes represent municipal and state utility taxes and gross receipts taxes related to their operating revenues. The offsetting collection of utility taxes from customers is recorded in revenues in the Registrants’ Consolidated Statements of Operations and Comprehensive Income.
Schedule of Other Nonoperating Income, by Component	Other, net Exelon ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2024 AFUDC — Equity $ 40 $ 10 $ 8 $ 7 $ 15 $ 12 $ 3 $ — Non-service net periodic benefit cost (7) — — — — — — — Three Months Ended March 31, 2023 AFUDC — Equity $ 38 $ 10 $ 6 $ 3 $ 19 $ 14 $ 2 $ 3 Non-service net periodic benefit cost (1) — — — — — — —
Schedule of Cash Flow, Supplemental Disclosures	The following tables provide additional information about material items recorded in the Registrants' Consolidated Statements of Cash Flows. Depreciation, amortization, and accretion Exelon ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2024 Property, plant, and equipment (a) $ 711 $ 284 $ 101 $ 122 $ 190 $ 81 $ 52 $ 53 Amortization of regulatory assets and liabilities, net (a) 166 78 3 28 56 26 9 21 Amortization of intangible assets, net (a) 2 — — — — — — — ARO accretion (b) 1 — — — — — — — Total depreciation, amortization and accretion $ 880 $ 362 $ 104 $ 150 $ 246 $ 107 $ 61 $ 74 Three Months Ended March 31, 2023 Property, plant, and equipment (a) $ 680 $ 267 $ 95 $ 124 $ 180 $ 76 $ 51 $ 47 Amortization of regulatory assets and liabilities, net (a) 178 71 3 43 61 32 9 20 Amortization of intangible assets, net (a) 2 — — — — — — — Total depreciation and amortization $ 860 $ 338 $ 98 $ 167 $ 241 $ 108 $ 60 $ 67 __________ (a) Included in Depreciation and amortization expense in the Registrants' Consolidated Statements of Operations and Comprehensive Income. (b) Included in Operating and maintenance expense in Exelon's Consolidated Statements of Operations and Comprehensive Income. Other non-cash operating activities Exelon ComEd PECO BGE PHI Pepco DPL ACE Three Months Ended March 31, 2024 Pension and OPEB costs $ 61 $ 17 $ — $ 15 $ 23 $ 9 $ 4 $ 3 Allowance for credit losses 63 2 27 12 22 16 3 3 True-up adjustments to decoupling mechanisms and formula rates (a) (91) (19) 2 (43) (31) (29) 4 (6) Amortization of operating ROU asset 9 — — 2 6 1 2 1 AFUDC — Equity (40) (10) (8) (7) (15) (12) (3) — Three Months Ended March 31, 2023 Pension and OPEB costs (benefit) $ 45 $ 6 $ (3) $ 14 $ 24 $ 8 $ 4 $ 4 Allowance for credit losses 70 — 37 18 15 7 5 3 True-up adjustments to decoupling mechanisms and formula rates (a) (282) (153) 4 (65) (68) (39) (11) (18) Long-term incentive plan 2 — — — — — — — Amortization of operating ROU asset 10 1 — 1 7 1 2 1 Change in environmental liabilities 25 — — — 25 25 — — AFUDC — Equity (38) (10) (6) (3) (19) (14) (2) (3) __________ (a) For ComEd, reflects the true-up adjustments in Regulatory assets and liabilities associated with its distribution, energy efficiency, distributed generation, and transmission formula rates. For PECO, reflects the change in Regulatory assets and liabilities associated with its transmission formula rates. For BGE, Pepco, DPL, and ACE, reflects the change in Regulatory assets and liabilities associated with their decoupling mechanisms and transmission formula rates. See Note 3 — Regulatory Matters of the 2023 Form 10-K for additional information. The following tables provide a reconciliation of cash, cash equivalents, and restricted cash reported within the Registrants’ Consolidated Balance Sheets that sum to the total of the same amounts in their Consolidated Statements of Cash Flows. Cash, cash equivalents, and restricted cash Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at March 31, 2024 Cash and cash equivalents $ 720 $ 100 $ 39 $ 27 $ 504 $ 198 $ 269 $ 27 Restricted cash and cash equivalents 489 428 9 — 23 22 1 — Restricted cash included in Other deferred debits and other assets 99 99 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,308 $ 627 $ 48 $ 27 $ 527 $ 220 $ 270 $ 27 Balance at December 31, 2023 Cash and cash equivalents $ 445 $ 110 $ 42 $ 47 $ 180 $ 48 $ 16 $ 21 Restricted cash and cash equivalents 482 402 9 1 24 24 — — Restricted cash included in Other deferred debits and other assets 174 174 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,101 $ 686 $ 51 $ 48 $ 204 $ 72 $ 16 $ 21 Balance at March 31, 2023 Cash and cash equivalents $ 522 $ 75 $ 27 $ 20 $ 367 $ 126 $ 142 $ 71 Restricted cash and cash equivalents 381 323 9 1 29 27 1 — Restricted cash included in Other deferred debits and other assets 180 180 — — — — — — Total cash, restricted cash, and cash equivalents $ 1,083 $ 578 $ 36 $ 21 $ 396 $ 153 $ 143 $ 71 For additional information on restricted cash see Note 1 — Significant Accounting Policies of the 2023 Form 10-K.
Consolidated Balance Sheet	The following table provides additional information about material items recorded in the Registrants' Consolidated Balance Sheets. Accrued expenses Exelon ComEd PECO BGE PHI Pepco DPL ACE Balance at March 31, 2024 Compensation-related accruals (a) $ 349 $ 102 $ 46 $ 46 $ 59 $ 19 $ 12 $ 8 Taxes accrued 237 214 93 140 170 135 42 16 Interest accrued 408 80 54 59 87 40 29 17 Balance at December 31, 2023 Compensation-related accruals (a) $ 661 $ 206 $ 87 $ 81 $ 107 $ 27 $ 17 $ 12 Taxes accrued 221 204 96 75 137 116 30 10 Interest accrued 414 148 49 44 72 38 13 15 __________ (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, 2024
Related Party Transactions [Abstract]
BSC and PHISCO Service Companies	The following table presents the service company costs allocated to the Registrants: Operating and maintenance from affiliates Capitalized costs Three Months Ended March 31, Three Months Ended March 31, 2024 2023 2024 2023 Exelon BSC $ 158 $ 175 PHISCO 29 24 ComEd BSC $ 100 $ 83 71 81 PECO BSC 58 51 29 30 BGE BSC 59 54 24 24 PHI BSC 50 42 34 40 PHISCO — — 29 24 Pepco BSC 31 27 17 14 PHISCO 33 30 12 11 DPL BSC 19 17 12 10 PHISCO 25 24 9 7 ACE BSC 16 14 5 14 PHISCO 23 22 8 6
Current Receivables From/Payables To Affiliates	The following tables present current Receivables from affiliates and current Payables to affiliates: March 31, 2024 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 66 $ — $ 6 $ 72 PECO $ — — — — — 33 — 8 41 BGE — — — — — 35 — 2 37 PHI — — — — — — 6 — 11 17 Pepco — — — — — 19 17 1 37 DPL — — — — — 13 12 — 25 ACE — — — — — 10 12 — 22 Other 3 — — 1 — 4 — 8 Total $ 3 $ — $ — $ 1 $ — $ 4 $ 182 $ 41 $ 28 $ 259 December 31, 2023 Receivables from affiliates: Payables to affiliates: ComEd PECO BGE Pepco DPL ACE BSC PHISCO Other Total ComEd $ — $ — $ — $ — $ — $ 64 $ — $ 8 $ 72 PECO $ — — — — — 36 — 3 39 BGE — — — — — 33 — 2 35 PHI — — — — — — 5 — 10 15 Pepco — — — — — 17 14 1 32 DPL — 1 — — — 12 11 1 25 ACE — 1 — 1 1 11 11 — 25 Other 3 — — 1 — 3 1 — 8 Total $ 3 $ 2 $ — $ 2 $ 1 $ 3 $ 179 $ 36 $ 25 $ 251
Long Term Debt to Financing Trusts	The following table presents Long-term debt to financing trusts: March 31, 2024 December 31, 2023 Exelon ComEd PECO Exelon ComEd PECO ComEd Financing III $ 206 $ 205 $ — $ 206 $ 205 $ — PECO Trust III 81 — 81 81 — 81 PECO Trust IV 103 — 103 103 — 103 Total $ 390 $ 205 $ 184 $ 390 $ 205 $ 184

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details)						3 Months Ended		36 Months Ended	48 Months Ended
	Dec. 14, 2023 USD ($)	Sep. 27, 2023 USD ($)	Jan. 17, 2023 USD ($)	Sep. 27, 2022	Feb. 03, 2022	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2027 USD ($)	Mar. 31, 2022 USD ($)
Commonwealth Edison Co
Regulatory Matters Additional Narrative Information [Line Items]
Basis points for ComEd's Revenue Requirement					580
Maximum increase of revenue requirement						105%
Basis Points - ComEd Symmetrical Performance Adjustments				32
Increase (Decrease) in Regulatory Assets						$ (286,000,000)
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 1,487,000,000	$ 1,487,000,000
Approved Revenue Requirement Increase (Decrease)	$ 501,000,000
Commonwealth Edison Co | Forecast [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Initial requested revenue increase 2024-2027									$ 1,472,000,000
Current requested revenue increase 2024-2027									1,545,000,000
Beneficial electrification approved annual spending								$ 77,000,000
Commonwealth Edison Co | Forecast [Member] | 2023 | Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Approved Revenue Requirement Increase (Decrease)									$ 986,000,000
Commonwealth Edison Co | Carbon Mitigation Credit rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						405,000,000
Increase (Decrease) in Regulatory Assets						(268,000,000)
PECO Energy Co
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities						(17,000,000)
PECO Energy Co | Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities						(26,000,000)
Baltimore Gas and Electric Company
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities						75,000,000
Baltimore Gas and Electric Company | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities						75,000,000
Atlantic City Electric Company
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability						31,000,000				$ 203,000,000
Gain (Loss) on Contract Termination						18,000,000	$ 19,000,000
Increase (Decrease) in Regulatory Assets						34,000,000
Atlantic City Electric Company | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets						13,000,000
Atlantic City Electric Company | Storm Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets						8,000,000
Atlantic City Electric Company | Energy Efficiency and Demand Response Programs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets						$ 8,000,000

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Completed Rate Cases (Details)

3 Months Ended

48 Months Ended

Apr. 18, 2024 USD ($)

Dec. 18, 2023 USD ($)

Dec. 14, 2023 USD ($)

Nov. 30, 2023 USD ($)

Nov. 17, 2023 USD ($)

Sep. 29, 2023 USD ($)

Sep. 27, 2023 USD ($)

Aug. 21, 2023 USD ($)

Apr. 21, 2023 USD ($)

Feb. 17, 2023 USD ($)

Jan. 17, 2023 USD ($)

Dec. 14, 2022 USD ($)

May 19, 2022 USD ($)

Feb. 23, 2022

Feb. 03, 2022

Jun. 28, 2021 USD ($)

Mar. 31, 2021 USD ($)

Mar. 31, 2024 USD ($)

Dec. 31, 2027 USD ($)

Commonwealth Edison Co

Regulatory Matters Completed Rate Cases [Line Items]

Basis points for ComEd's Revenue Requirement

580

Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 1,487,000,000

$ 1,487,000,000

Approved Revenue Requirement Increase (Decrease)

$ 501,000,000

Approved Return on Equity, Percentage

8.905%

Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | Forecast [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Debt Capital Structure, Percentage

50%

Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2023 | Forecast [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 986,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2024

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 451,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2025

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

14,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2026

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

6,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case | 2027

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

30,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Reconciliation Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation

$ 247,000,000

Approved Revenue Requirement Increase (Decrease)

$ 259,000,000

Approved Return on Equity, Percentage

8.91%

Public Utilities, Approved Equity Capital Structure, Percentage

6.48%

Commonwealth Edison Co | Illinois 2023 Electric Distribution Reconciliation Rate Case | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Basis points for ComEd's Revenue Requirement

580

Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 838,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | Subsequent Event [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 810,000,000

Approved Return on Equity, Percentage

8.905%

Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | 2024 | Subsequent Event [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 150,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | 2025 | Subsequent Event [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

186,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | 2026 | Subsequent Event [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

221,000,000

Commonwealth Edison Co | Illinois 2023 Electric Distribution Order on Rehearing | 2027 | Subsequent Event [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

253,000,000

Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 313,000,000

Approved Revenue Requirement Increase (Decrease)

$ 179,000,000

Approved Return on Equity, Percentage

9.50%

Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Base Rate Case | 2024

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 41,000,000

Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Base Rate Case | 2025

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

113,000,000

Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Base Rate Case | 2026

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

25,000,000

Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 289,000,000

Approved Revenue Requirement Increase (Decrease)

$ 229,000,000

Approved Return on Equity, Percentage

9.45%

Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Base Rate Case | 2024

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

126,000,000

Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Base Rate Case | 2025

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

62,000,000

Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Base Rate Case | 2026

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 41,000,000

Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Reconciliation Rate Case | 2021

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 13,000,000

Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Reconciliation Rate Case | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

39,000,000

Baltimore Gas and Electric Company | Maryland 2023 Electric Distribution Reconciliation Rate Case | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

79,000,000

Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Reconciliation Rate Case | 2021

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

7,000,000

Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Reconciliation Rate Case | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

15,000,000

Baltimore Gas and Electric Company | Maryland 2023 Gas Distribution Reconciliation Rate Case | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 73,000,000

Potomac Electric Power Company | Maryland 2020 Electric Distribution Base Rate Case [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 104,000,000

Approved Revenue Requirement Increase (Decrease)

$ 52,000,000

Approved Return on Equity, Percentage

9.55%

Potomac Electric Power Company | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 21,000,000

Potomac Electric Power Company | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

16,000,000

Potomac Electric Power Company | Maryland 2020 Electric Distribution Base Rate Case [Member] | 2024

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 15,000,000

Potomac Electric Power Company | Maryland 2020 Electric Distribution Base Rate Case [Member] | Offsets | 2022

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Approved Rate Increase (Decrease), Percentage

25%

Delmarva Power and Light Company | Maryland 2022 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Requested Revenue Requirement Increase (Decrease)

$ 38,000,000

Approved Revenue Requirement Increase (Decrease)

$ 29,000,000

Approved Return on Equity, Percentage

9.60%

Delmarva Power and Light Company | Maryland 2022 Electric Distribution Base Rate Case | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 17,000,000

Delmarva Power and Light Company | Maryland 2022 Electric Distribution Base Rate Case | 2024

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

6,000,000

Delmarva Power and Light Company | Maryland 2022 Electric Distribution Base Rate Case | 2025

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 6,000,000

Delmarva Power and Light Company | Delaware 2022 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 39,000,000

Delmarva Power and Light Company | Delaware 2022 Electric Distribution Base Rate Case | Subsequent Event [Member]

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 28,000,000

Approved Return on Equity, Percentage

9.60%

Atlantic City Electric Company | New Jersey 2023 Electric Distribution Base Rate Case

Regulatory Matters Completed Rate Cases [Line Items]

Public Utilities, Requested Rate Increase (Decrease), Amended, Amount

$ 92,000,000

Approved Revenue Requirement Increase (Decrease)

$ 45,000,000

Approved Return on Equity, Percentage

9.60%

Atlantic City Electric Company | New Jersey 2023 Electric Distribution Base Rate Case | 2023

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 36,000,000

Atlantic City Electric Company | New Jersey 2023 Electric Distribution Base Rate Case | 2024

Regulatory Matters Completed Rate Cases [Line Items]

Approved Revenue Requirement Increase (Decrease)

$ 9,000,000

Regulatory Matters - Schedule_2

Regulatory Matters - Schedule of Pending Rate Cases (Details) - USD ($)	Apr. 26, 2024	Mar. 28, 2024	Mar. 15, 2024	Feb. 27, 2024	Feb. 23, 2024
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			$ 670,000,000
Requested Return on Equity, Percentage			8.905%
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			$ 302,000,000
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			89,000,000
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			136,000,000
Commonwealth Edison Co | Illinois 2024 Refiled Grid Plan | 2027
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)			$ 143,000,000
Commonwealth Edison Co | Illinois 2024 Electric Distribution Reconciliation Rate Case | Subsequent Event [Member]
Regulatory Matters Pending Rate Cases [Line Items]
Public Utilities Requested Rate Increase (Decrease), Prior Year Annual Reconciliation	$ 627,000,000
Requested Return on Equity, Percentage	9.89%
PECO Energy Co | Pennsylvania 2024 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ 464,000,000
Requested Return on Equity, Percentage		10.95%
PECO Energy Co | Pennsylvania 2024 Electric Distribution Base Rate Case | 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ (64,000,000)
PECO Energy Co | Pennsylvania 2023 Natural Gas Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)		$ 111,000,000
Requested Return on Equity, Percentage		11.15%
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease), Amended				$ 186,000,000
Requested Return on Equity, Percentage				10.50%
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 116,000,000
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				35,000,000
Potomac Electric Power Company | District of Columbia 2023 Electric Distribution Base Rate Case | 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)				$ 35,000,000
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease), Amended					$ 186,000,000
Requested Return on Equity, Percentage					10.50%
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2024
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)					$ 68,000,000
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2025
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)					53,000,000
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2026
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)					51,000,000
Potomac Electric Power Company | Pepco Maryland 2023 Electric Distribution Base Rate Case | 2027
Regulatory Matters Pending Rate Cases [Line Items]
Requested Revenue Requirement Increase (Decrease)					$ 14,000,000

Regulatory Matters - Annual Ele

Regulatory Matters - Annual Electric Transmission Fillings (Details) - Subsequent Event [Member] $ in Millions	Apr. 24, 2024 USD ($)
Commonwealth Edison Co | 2024 Transmission Formula Rate Annual Update
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 32
Annual Reconciliation Increase	(12)
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 20
Public Utilities, Approved Equity Capital Structure, Percentage	8.14%
Public Utilities, Approved Return on Equity, Percentage	11.50%
Basis points for Transmission Formula Rate	50
Baltimore Gas and Electric Company | 2024 Transmission Formula Rate Annual Update
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 42
Annual Reconciliation Increase	13
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 53
Public Utilities, Approved Equity Capital Structure, Percentage	7.47%
Public Utilities, Approved Return on Equity, Percentage	10.50%
Basis points for Transmission Formula Rate	50
Baltimore Gas and Electric Company | 2024 Transmission Formula Rate Revenue Reduction
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 2

Regulatory Matters - Capitalize

Regulatory Matters - Capitalized Ratemaking Amount Not Recognized (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	$ 106	$ 110
Commonwealth Edison Co
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	36	32
PECO Energy Co
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	0	0
Baltimore Gas and Electric Company
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	30	33
Pepco Holdings LLC
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	40	45
Potomac Electric Power Company
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	27	34
Delmarva Power and Light Company
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	1	1
Atlantic City Electric Company
Public Utility, Property, Plant and Equipment [Line Items]
Public Utilities, Amount of Allowance for Earnings on Equity Capitalized for Rate Making Purposes	$ 12	$ 10

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Narrative (Details)	Mar. 31, 2024	Dec. 31, 2023	Jul. 01, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period			35 years
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		31 years
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Potomac Electric Power Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period			35 years
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		31 years
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Atlantic City Electric Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period			35 years
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		31 years
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Delmarva Power and Light Company | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Change in Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	$ 133	$ 101
Revenues recognized	(2)	(1)
Ending Balance - Contract Liabilities	131	100
Pepco Holdings LLC
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	133	101
Revenues recognized	(2)	(1)
Ending Balance - Contract Liabilities	131	100
Potomac Electric Power Company
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	107	81
Revenues recognized	(2)	(1)
Ending Balance - Contract Liabilities	105	80
Delmarva Power and Light Company
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	13	10
Revenues recognized	0	0
Ending Balance - Contract Liabilities	13	10
Atlantic City Electric Company
Contract Liabilities [Roll Forward]
Beginning Balance - Contract Liabilities	13	10
Revenues recognized	0	0
Ending Balance - Contract Liabilities	$ 13	$ 10

Revenue from Contract with Cust

Revenue from Contract with Customer - Performance Obligations (Details) $ in Millions	Mar. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 131
Pepco Holdings LLC
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	131
Potomac Electric Power Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	105
Delmarva Power and Light Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	13
Atlantic City Electric Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	13
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Pepco Holdings LLC
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Potomac Electric Power Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Delmarva Power and Light Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Atlantic City Electric Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Pepco Holdings LLC
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Potomac Electric Power Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Delmarva Power and Light Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Atlantic City Electric Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	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]
Revenue, remaining performance obligation, amount	$ 6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Pepco Holdings LLC
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Potomac Electric Power Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Delmarva Power and Light Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Atlantic City Electric Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	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]
Revenue, remaining performance obligation, amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Pepco Holdings LLC
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Potomac Electric Power Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Delmarva Power and Light Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 | Atlantic City Electric Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 109
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 | Pepco Holdings LLC
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 109
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 | Potomac Electric Power Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 86
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 | Delmarva Power and Light Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 11
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 | Atlantic City Electric Company
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 12
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Segment Information - Narrative

Segment Information - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 Reportable_segment
Segment Reporting Information [Line Items]
Number of reportable segments	6
Pepco Holdings LLC
Segment Reporting Information [Line Items]
Number of reportable segments	3

Segment Information - Reconcili

Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total operating revenues	$ 6,043	$ 5,563
Income taxes	63	134
Net income (loss):	658	669
Total assets	103,211		$ 101,546
Pepco Holdings LLC
Segment Reporting Information [Line Items]
Total operating revenues	1,606	1,536
Income taxes	40	34
Net income (loss):	168	155
Total assets	27,535		26,903
Related Party
Segment Reporting Information [Line Items]
Interest expense, net	6	6
Related Party | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues from affiliates	3	3
Operating Segment
Segment Reporting Information [Line Items]
Total operating revenues	6,043	5,563
Depreciation and amortization	879	860
Operating expenses	4,931	4,457
Interest expense, net	468	412
Income taxes	63	134
Net income (loss):	658	669
Capital expenditures	1,767	1,881
Total assets	103,211		101,546
Operating Segment | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	0	0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total operating revenues	(468)	(446)
Depreciation and amortization	0	0
Operating expenses	(475)	(447)
Interest expense, net	0	0
Income taxes	0	0
Net income (loss):	0	0
Capital expenditures	0	0
Total assets	(4,392)		(4,337)
Intersegment Eliminations | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Total operating revenues	(111)	(103)
Depreciation and amortization	0	0
Operating expenses	(110)	(103)
Interest expense, net	0	0
Income taxes	0	0
Net income (loss):	0	0
Capital expenditures	0	0
Total assets	(312)		(41)
Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	(466)	(445)
Intersegment Eliminations | Related Party | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues from affiliates	(111)	(103)
Commonwealth Edison Co | Operating Segment
Segment Reporting Information [Line Items]
Total operating revenues	2,095	1,667
Depreciation and amortization	362	338
Operating expenses	1,781	1,256
Interest expense, net	122	117
Income taxes	19	71
Net income (loss):	193	241
Capital expenditures	594	617
Total assets	43,132		42,827
Commonwealth Edison Co | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	2	3
PECO Energy Co | Operating Segment
Segment Reporting Information [Line Items]
Total operating revenues	1,054	1,112
Depreciation and amortization	104	98
Operating expenses	851	902
Interest expense, net	55	48
Income taxes	10	4
Net income (loss):	149	166
Capital expenditures	361	335
Total assets	16,116		15,595
PECO Energy Co | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	2	2
Baltimore Gas and Electric Company | Operating Segment
Segment Reporting Information [Line Items]
Total operating revenues	1,297	1,257
Depreciation and amortization	150	167
Operating expenses	967	964
Interest expense, net	50	44
Income taxes	24	52
Net income (loss):	264	200
Capital expenditures	324	350
Total assets	14,444		14,184
Baltimore Gas and Electric Company | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	2	3
Pepco Holdings LLC | Operating Segment
Segment Reporting Information [Line Items]
Total operating revenues	1,606	1,536
Depreciation and amortization	246	241
Operating expenses	1,335	1,297
Interest expense, net	90	76
Income taxes	40	34
Net income (loss):	168	155
Capital expenditures	453	561
Total assets	27,535		26,903
Pepco Holdings LLC | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	3	3
Potomac Electric Power Company | Operating Segment
Segment Reporting Information [Line Items]
Total operating revenues	759	710
Depreciation and amortization	107	108
Operating expenses	640	610
Interest expense, net	45	39
Income taxes	14	12
Net income (loss):	75	65
Capital expenditures	229	264
Total assets	11,585		11,194
Potomac Electric Power Company | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	2	1
Delmarva Power and Light Company | Operating Segment
Segment Reporting Information [Line Items]
Total operating revenues	491	474
Depreciation and amortization	61	60
Operating expenses	391	388
Interest expense, net	22	17
Income taxes	17	12
Net income (loss):	66	60
Capital expenditures	134	134
Total assets	6,291		5,966
Delmarva Power and Light Company | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	2	2
Atlantic City Electric Company | Operating Segment
Segment Reporting Information [Line Items]
Total operating revenues	358	353
Depreciation and amortization	74	67
Operating expenses	303	298
Interest expense, net	20	16
Income taxes	11	11
Net income (loss):	29	33
Capital expenditures	89	161
Total assets	5,253		5,157
Atlantic City Electric Company | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	1	1
Corporate and Other | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total operating revenues	459	437
Depreciation and amortization	17	16
Operating expenses	472	485
Interest expense, net	151	127
Income taxes	(30)	(27)
Net income (loss):	(116)	(93)
Capital expenditures	35	18
Total assets	6,376		6,374
Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Total operating revenues	109	102
Depreciation and amortization	4	6
Operating expenses	111	104
Interest expense, net	3	4
Income taxes	(2)	(1)
Net income (loss):	(2)	(3)
Capital expenditures	1	2
Total assets	4,718		$ 4,627
Corporate and Other | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	457	434
Corporate and Other | Intersegment Eliminations | Related Party | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues from affiliates	109	102
Rate-regulated electric revenues
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	5,198	4,462
Rate-regulated electric revenues | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	1,485	1,371
Rate-regulated electric revenues | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	5,284	4,707
Rate-regulated electric revenues | Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	(6)	(5)
Rate-regulated electric revenues | Intersegment Eliminations | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	(4)	(4)
Rate-regulated electric revenues | Commonwealth Edison Co | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	2,095	1,667
Rate-regulated electric revenues | PECO Energy Co | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	782	795
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	881	814
Rate-regulated electric revenues | Pepco Holdings LLC | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	1,532	1,436
Rate-regulated electric revenues | Potomac Electric Power Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	759	710
Rate-regulated electric revenues | Delmarva Power and Light Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	419	377
Rate-regulated electric revenues | Atlantic City Electric Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	358	353
Rate-regulated electric revenues | Corporate and Other | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated electric revenues | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	739	822
Rate-regulated natural gas revenues | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	72	97
Rate-regulated natural gas revenues | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	759	856
Rate-regulated natural gas revenues | Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	(1)	(1)
Rate-regulated natural gas revenues | Intersegment Eliminations | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Commonwealth Edison Co | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | PECO Energy Co | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	272	317
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	416	443
Rate-regulated natural gas revenues | Pepco Holdings LLC | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	72	97
Rate-regulated natural gas revenues | Potomac Electric Power Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	72	97
Rate-regulated natural gas revenues | Atlantic City Electric Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Corporate and Other | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Shared service and other revenues | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Shared service and other revenues | Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	(461)	(440)
Shared service and other revenues | Intersegment Eliminations | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	(107)	(99)
Shared service and other revenues | Commonwealth Edison Co | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Shared service and other revenues | PECO Energy Co | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Shared service and other revenues | Baltimore Gas and Electric Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Shared service and other revenues | Pepco Holdings LLC | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	2	3
Shared service and other revenues | Potomac Electric Power Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Shared service and other revenues | Delmarva Power and Light Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Shared service and other revenues | Atlantic City Electric Company | Operating Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	0	0
Shared service and other revenues | Corporate and Other | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	459	437
Shared service and other revenues | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Electric and natural gas operating revenues	$ 109	$ 102

Segment Information - Electric

Segment Information - Electric and Gas Revenue by Customer Class (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue, Major Customer [Line Items]
Total operating revenues	$ 6,043	$ 5,563
Operating Segment
Revenue, Major Customer [Line Items]
Total operating revenues	6,043	5,563
Operating Segment | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	0	0
Commonwealth Edison Co
Revenue, Major Customer [Line Items]
Total operating revenues	2,095	1,667
Commonwealth Edison Co | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	3
Commonwealth Edison Co | Regulated Operation
Revenue, Major Customer [Line Items]
Total operating revenues	2,076	1,508
Commonwealth Edison Co | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	19	159
PECO Energy Co
Revenue, Major Customer [Line Items]
Total operating revenues	1,054	1,112
PECO Energy Co | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	2
PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Total operating revenues	1,056	1,111
PECO Energy Co | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	(2)	1
Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Total operating revenues	1,297	1,257
Baltimore Gas and Electric Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	3
Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Total operating revenues	1,251	1,186
Baltimore Gas and Electric Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	46	71
Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Total operating revenues	1,606	1,536
Pepco Holdings LLC | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	3	3
Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Total operating revenues	1,557	1,467
Pepco Holdings LLC | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	49	69
Potomac Electric Power Company
Revenue, Major Customer [Line Items]
Total operating revenues	759	710
Potomac Electric Power Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	1
Potomac Electric Power Company | Regulated Operation
Revenue, Major Customer [Line Items]
Total operating revenues	728	668
Potomac Electric Power Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	31	42
Delmarva Power and Light Company
Revenue, Major Customer [Line Items]
Total operating revenues	491	474
Delmarva Power and Light Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	2
Delmarva Power and Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Total operating revenues	486	464
Delmarva Power and Light Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	5	10
Atlantic City Electric Company
Revenue, Major Customer [Line Items]
Total operating revenues	358	353
Atlantic City Electric Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	1	1
Atlantic City Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Total operating revenues	345	336
Atlantic City Electric Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	13	17
Rate-regulated electric revenues
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	5,198	4,462
Rate-regulated electric revenues | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	5,284	4,707
Rate-regulated electric revenues | Commonwealth Edison Co
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	2,074	1,511
Rate-regulated electric revenues | Commonwealth Edison Co | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	2,076	1,508
Rate-regulated electric revenues | Commonwealth Edison Co | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	3
Rate-regulated electric revenues | Commonwealth Edison Co | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	6
Rate-regulated electric revenues | Commonwealth Edison Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	918	836
Rate-regulated electric revenues | Commonwealth Edison Co | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	594	361
Rate-regulated electric revenues | Commonwealth Edison Co | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	320	84
Rate-regulated electric revenues | Commonwealth Edison Co | Regulated Operation | Public authorities & electric railroads
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	17	10
Rate-regulated electric revenues | Commonwealth Edison Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	227	217
Rate-regulated electric revenues | PECO Energy Co
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	782	798
Rate-regulated electric revenues | PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	784	795
Rate-regulated electric revenues | PECO Energy Co | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	1
Rate-regulated electric revenues | PECO Energy Co | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	4
Rate-regulated electric revenues | PECO Energy Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	520	519
Rate-regulated electric revenues | PECO Energy Co | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	126	135
Rate-regulated electric revenues | PECO Energy Co | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	57	65
Rate-regulated electric revenues | PECO Energy Co | Regulated Operation | Public authorities & electric railroads
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	7	8
Rate-regulated electric revenues | PECO Energy Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	74	68
Rate-regulated electric revenues | Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	857	780
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	856	778
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	1	2
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	2	4
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	534	434
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	90	92
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	132	149
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Regulated Operation | Public authorities & electric railroads
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	7	7
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	93	96
Rate-regulated electric revenues | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	1,485	1,371
Rate-regulated electric revenues | Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	1,485	1,370
Rate-regulated electric revenues | Pepco Holdings LLC | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	3	3
Rate-regulated electric revenues | Pepco Holdings LLC | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	3	4
Rate-regulated electric revenues | Pepco Holdings LLC | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	775	639
Rate-regulated electric revenues | Pepco Holdings LLC | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	158	160
Rate-regulated electric revenues | Pepco Holdings LLC | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	340	378
Rate-regulated electric revenues | Pepco Holdings LLC | Regulated Operation | Public authorities & electric railroads
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	20	17
Rate-regulated electric revenues | Pepco Holdings LLC | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	192	176
Rate-regulated electric revenues | Potomac Electric Power Company
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	728	670
Rate-regulated electric revenues | Potomac Electric Power Company | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	728	668
Rate-regulated electric revenues | Potomac Electric Power Company | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	1
Rate-regulated electric revenues | Potomac Electric Power Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	2	3
Rate-regulated electric revenues | Potomac Electric Power Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	345	283
Rate-regulated electric revenues | Potomac Electric Power Company | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	46	39
Rate-regulated electric revenues | Potomac Electric Power Company | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	262	282
Rate-regulated electric revenues | Potomac Electric Power Company | Regulated Operation | Public authorities & electric railroads
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	11	8
Rate-regulated electric revenues | Potomac Electric Power Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	64	56
Rate-regulated electric revenues | Delmarva Power and Light Company
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	413	366
Rate-regulated electric revenues | Delmarva Power and Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	414	367
Rate-regulated electric revenues | Delmarva Power and Light Company | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	2
Rate-regulated electric revenues | Delmarva Power and Light Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	1	1
Rate-regulated electric revenues | Delmarva Power and Light Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	256	210
Rate-regulated electric revenues | Delmarva Power and Light Company | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	62	62
Rate-regulated electric revenues | Delmarva Power and Light Company | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	29	33
Rate-regulated electric revenues | Delmarva Power and Light Company | Regulated Operation | Public authorities & electric railroads
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	4	4
Rate-regulated electric revenues | Delmarva Power and Light Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	63	58
Rate-regulated electric revenues | Atlantic City Electric Company
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	344	335
Rate-regulated electric revenues | Atlantic City Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	345	336
Rate-regulated electric revenues | Atlantic City Electric Company | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	1	1
Rate-regulated electric revenues | Atlantic City Electric Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated electric revenues | Atlantic City Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	174	146
Rate-regulated electric revenues | Atlantic City Electric Company | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	50	59
Rate-regulated electric revenues | Atlantic City Electric Company | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	49	63
Rate-regulated electric revenues | Atlantic City Electric Company | Regulated Operation | Public authorities & electric railroads
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	5	5
Rate-regulated electric revenues | Atlantic City Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	67	63
Rate-regulated natural gas revenues
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	739	822
Rate-regulated natural gas revenues | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	759	856
Rate-regulated natural gas revenues | Commonwealth Edison Co | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Commonwealth Edison Co | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Commonwealth Edison Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Commonwealth Edison Co | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Commonwealth Edison Co | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Commonwealth Edison Co | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Commonwealth Edison Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | PECO Energy Co
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	272	316
Rate-regulated natural gas revenues | PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	272	316
Rate-regulated natural gas revenues | PECO Energy Co | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates		1
Rate-regulated natural gas revenues | PECO Energy Co | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	1
Rate-regulated natural gas revenues | PECO Energy Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	193	223
Rate-regulated natural gas revenues | PECO Energy Co | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	64	75
Rate-regulated natural gas revenues | PECO Energy Co | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	1
Rate-regulated natural gas revenues | PECO Energy Co | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	8	8
Rate-regulated natural gas revenues | PECO Energy Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	7	9
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	395	409
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	395	408
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Regulated Operation | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	1	1
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	1	2
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	271	278
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	47	41
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	72	70
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	5	19
Rate-regulated natural gas revenues | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	72	97
Rate-regulated natural gas revenues | Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	72	97
Rate-regulated natural gas revenues | Pepco Holdings LLC | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Pepco Holdings LLC | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	46	60
Rate-regulated natural gas revenues | Pepco Holdings LLC | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	17	26
Rate-regulated natural gas revenues | Pepco Holdings LLC | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	2	1
Rate-regulated natural gas revenues | Pepco Holdings LLC | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	5	4
Rate-regulated natural gas revenues | Pepco Holdings LLC | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	2	6
Rate-regulated natural gas revenues | Potomac Electric Power Company | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Potomac Electric Power Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Potomac Electric Power Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Potomac Electric Power Company | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Potomac Electric Power Company | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Potomac Electric Power Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Potomac Electric Power Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Delmarva Power and Light Company
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	72	97
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	72	97
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	46	60
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	17	26
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	2	1
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	5	4
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	2	6
Rate-regulated natural gas revenues | Atlantic City Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Atlantic City Electric Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Atlantic City Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Atlantic City Electric Company | Regulated Operation | Small commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Atlantic City Electric Company | Regulated Operation | Large commercial & industrial
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Atlantic City Electric Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Rate-regulated natural gas revenues | Atlantic City Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	0	0
Alternative revenue programs | Commonwealth Edison Co | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	19	153
Alternative revenue programs | PECO Energy Co | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	(2)	(4)
Alternative revenue programs | Baltimore Gas and Electric Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	43	65
Alternative revenue programs | Pepco Holdings LLC | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	46	65
Alternative revenue programs | Potomac Electric Power Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	29	39
Alternative revenue programs | Delmarva Power and Light Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	4	9
Alternative revenue programs | Atlantic City Electric Company | Regulated Operation | Operating Segment
Revenue, Major Customer [Line Items]
Electric and natural gas operating revenues	$ 13	$ 17

Accounts Receivable - Allowance

Accounts Receivable - Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period provision for expected credit losses	$ (63)	$ (70)
Commonwealth Edison Co
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period provision for expected credit losses	(2)	0
PECO Energy Co
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period provision for expected credit losses	(27)	(37)
Baltimore Gas and Electric Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period provision for expected credit losses	(12)	(18)
Pepco Holdings LLC
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period provision for expected credit losses	(22)	(15)
Potomac Electric Power Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period provision for expected credit losses	(16)	(7)
Delmarva Power and Light Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period provision for expected credit losses	(3)	(5)
Atlantic City Electric Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Current period provision for expected credit losses	(3)	(3)
Customer accounts receivable
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	317	327
Current period provision for expected credit losses	79	108
Writeoffs, net of recoveries	50	46
Ending balance	346	389
Customer accounts receivable | Commonwealth Edison Co
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	69	59
Current period provision for expected credit losses	22	22
Writeoffs, net of recoveries	9	7
Ending balance	82	74
Customer accounts receivable | PECO Energy Co
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	95	105
Current period provision for expected credit losses	23	39
Writeoffs, net of recoveries	11	14
Ending balance	107	130
Customer accounts receivable | Baltimore Gas and Electric Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	46	54
Current period provision for expected credit losses	15	30
Writeoffs, net of recoveries	9	11
Ending balance	52	73
Customer accounts receivable | Pepco Holdings LLC
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	107	109
Current period provision for expected credit losses	19	17
Writeoffs, net of recoveries	21	14
Ending balance	105	112
Customer accounts receivable | Potomac Electric Power Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	52	47
Current period provision for expected credit losses	12	9
Writeoffs, net of recoveries	12	7
Ending balance	52	49
Customer accounts receivable | Delmarva Power and Light Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	19	21
Current period provision for expected credit losses	3	7
Writeoffs, net of recoveries	5	2
Ending balance	17	26
Customer accounts receivable | Atlantic City Electric Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	36	41
Current period provision for expected credit losses	4	1
Writeoffs, net of recoveries	4	5
Ending balance	36	37
Other receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	82	82
Current period provision for expected credit losses	18	14
Writeoffs, net of recoveries	4	5
Ending balance	96	91
Other receivables | Commonwealth Edison Co
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17	17
Current period provision for expected credit losses	3	2
Writeoffs, net of recoveries	1	1
Ending balance	19	18
Other receivables | PECO Energy Co
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8	9
Current period provision for expected credit losses	5	3
Writeoffs, net of recoveries	0	1
Ending balance	13	11
Other receivables | Baltimore Gas and Electric Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	7	10
Current period provision for expected credit losses	2	4
Writeoffs, net of recoveries	2	2
Ending balance	7	12
Other receivables | Pepco Holdings LLC
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	50	46
Current period provision for expected credit losses	8	5
Writeoffs, net of recoveries	1	1
Ending balance	57	50
Other receivables | Potomac Electric Power Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	28	25
Current period provision for expected credit losses	7	3
Writeoffs, net of recoveries	0	0
Ending balance	35	28
Other receivables | Delmarva Power and Light Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8	7
Current period provision for expected credit losses	0	1
Writeoffs, net of recoveries	0	0
Ending balance	8	8
Other receivables | Atlantic City Electric Company
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14	14
Current period provision for expected credit losses	1	1
Writeoffs, net of recoveries	1	1
Ending balance	$ 14	$ 14

Accounts Receivable - Unbilled

Accounts Receivable - Unbilled Customer Revenue (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	$ 849	$ 991
Commonwealth Edison Co
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	344	351
PECO Energy Co
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	138	185
Baltimore Gas and Electric Company
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	171	208
Pepco Holdings LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	196	247
Potomac Electric Power Company
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	96	109
Delmarva Power and Light Company
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	53	64
Atlantic City Electric Company
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unbilled customer revenue	$ 47	$ 74

Accounts Receivable - Purchases

Accounts Receivable - Purchases and Sales of Accounts Receivable (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	$ 1,060	$ 1,108
Commonwealth Edison Co
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	235	240
PECO Energy Co
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	297	309
Baltimore Gas and Electric Company
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	219	245
Pepco Holdings LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	309	314
Potomac Electric Power Company
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	194	210
Delmarva Power and Light Company
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	60	56
Atlantic City Electric Company
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Purchase	$ 55	$ 48

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	Aug. 16, 2022	Mar. 31, 2024
Income Tax Additional Narrative Information [Line Items]
Notes payable, current		$ 183
Notes payable, noncurrent		331
Tax credit carryforward, valuation allowance		0
Commonwealth Edison Co
Income Tax Additional Narrative Information [Line Items]
Tax credit carryforward, valuation allowance		0
PECO Energy Co
Income Tax Additional Narrative Information [Line Items]
Tax credit carryforward, valuation allowance		0
Baltimore Gas and Electric Company
Income Tax Additional Narrative Information [Line Items]
Tax credit carryforward, valuation allowance		0
Pepco Holdings LLC
Income Tax Additional Narrative Information [Line Items]
Tax credit carryforward, valuation allowance		0
Potomac Electric Power Company
Income Tax Additional Narrative Information [Line Items]
Tax credit carryforward, valuation allowance		0
Delmarva Power and Light Company
Income Tax Additional Narrative Information [Line Items]
Tax credit carryforward, valuation allowance		0
Atlantic City Electric Company
Income Tax Additional Narrative Information [Line Items]
Tax credit carryforward, valuation allowance		$ 0
US Treasury (UST) Interest Rate
Income Tax Additional Narrative Information [Line Items]
Effective income tax rate reconciliation, change in enacted tax rate, percent	15%

Income Taxes - Reconciliation t

Income Taxes - Reconciliation to Effective Tax Rate (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%
State income taxes, net of federal income tax benefit	6.40%	6%
Plant basis differences	(3.80%)	(4.00%)
Excess deferred tax amortization	(14.70%)	(6.30%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Tax credits	(0.40%)	(0.50%)
Other	0.30%	0.60%
Effective income tax rate	8.70%	16.70%
Commonwealth Edison Co
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%
State income taxes, net of federal income tax benefit	7.80%	7.90%
Plant basis differences	(0.90%)	(0.30%)
Excess deferred tax amortization	(18.90%)	(5.70%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Tax credits	(0.30%)	(0.30%)
Other	0.40%	0.30%
Effective income tax rate	9%	22.80%
PECO Energy Co
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%
State income taxes, net of federal income tax benefit	(0.60%)	(1.40%)
Plant basis differences	(12.20%)	(15.20%)
Excess deferred tax amortization	(2.30%)	(2.40%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	0%
Tax credits	0%	0%
Other	0.40%	0.40%
Effective income tax rate	6.30%	2.40%
Baltimore Gas and Electric Company
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%
State income taxes, net of federal income tax benefit	6.30%	6.40%
Plant basis differences	(1.20%)	(0.70%)
Excess deferred tax amortization	(17.50%)	(5.40%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	(0.10%)
Tax credits	(0.40%)	(0.50%)
Other	0.10%	(0.10%)
Effective income tax rate	8.30%	20.60%
Pepco Holdings LLC
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%
State income taxes, net of federal income tax benefit	6.40%	6%
Plant basis differences	(0.90%)	(1.80%)
Excess deferred tax amortization	(6.80%)	(7.00%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Tax credits	(0.30%)	(0.40%)
Other	(0.10%)	0.30%
Effective income tax rate	19.20%	18%
Potomac Electric Power Company
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%
State income taxes, net of federal income tax benefit	6.20%	5.40%
Plant basis differences	(1.30%)	(2.50%)
Excess deferred tax amortization	(9.90%)	(8.40%)
Amortization of investment tax credit, including deferred taxes on basis difference	0%	0%
Tax credits	(0.30%)	(0.40%)
Other	0%	0.50%
Effective income tax rate	15.70%	15.60%
Delmarva Power and Light Company
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%
State income taxes, net of federal income tax benefit	6.20%	6.30%
Plant basis differences	(1.10%)	(1.00%)
Excess deferred tax amortization	(5.40%)	(8.80%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Tax credits	(0.30%)	(0.40%)
Other	0.20%	(0.30%)
Effective income tax rate	20.50%	16.70%
Atlantic City Electric Company
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items]
U.S. Federal statutory rate	21%	21%
State income taxes, net of federal income tax benefit	7.10%	6.90%
Plant basis differences	0.10%	(0.90%)
Excess deferred tax amortization	(1.30%)	(2.00%)
Amortization of investment tax credit, including deferred taxes on basis difference	(0.10%)	(0.10%)
Tax credits	(0.30%)	(0.30%)
Other	1%	0.40%
Effective income tax rate	27.50%	25%

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 95	$ 94
Offsetting receivable	3,382	3,232
Constellation Energy Corp
Income Tax Contingency [Line Items]
Income taxes receivable, noncurrent	31	31
Deferred Costs and Other Assets
Income Tax Contingency [Line Items]
Offsetting receivable	31	31
Pepco Holdings LLC
Income Tax Contingency [Line Items]
Unrecognized tax benefits	51	51
Atlantic City Electric Company
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 15	$ 15

Retirement Benefits - Narrative

Retirement Benefits - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Increase (Decrease) in Obligation, Pension Benefits	$ 98
Increase (Decrease) in Obligation, Other Postretirement Benefits	1
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	25
Defined Benefit Plan Amounts Recognized In Regulatory Assets Before Tax	66
Defined Benefit Plan Amounts Recognized In Regulatory Liabilities Before Tax	$ 2
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets	7%
Discount rate	5.19%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on assets	6.50%
Discount rate	5.17%

Retirement Benefits - Calculati

Retirement Benefits - Calculation of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Amortization of:
Non-service net periodic benefit cost	$ (7)	$ (1)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	42	39
Interest cost	141	145
Expected return on assets	(184)	(189)
Amortization of:
Prior service cost (credit)	1	1
Actuarial loss	53	41
Non-service net periodic benefit cost	53	37
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	6
Interest cost	24	25
Expected return on assets	(21)	(21)
Amortization of:
Prior service cost (credit)	(2)	(2)
Actuarial loss	0	0
Non-service net periodic benefit cost	$ 8	$ 8

Retirement Benefits - Allocated

Retirement Benefits - Allocated Portion of Pension and Postretirement Benefit Plan Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	$ 61	$ 45
Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	61	45
Commonwealth Edison Co
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	17	6
Commonwealth Edison Co | Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	17	6
PECO Energy Co
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	0	(3)
PECO Energy Co | Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	0	(3)
Baltimore Gas and Electric Company
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	15	14
Baltimore Gas and Electric Company | Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	15	14
Pepco Holdings LLC
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	23	24
Pepco Holdings LLC | Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	23	24
Potomac Electric Power Company
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	9	8
Potomac Electric Power Company | Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	9	8
Delmarva Power and Light Company
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	4	4
Delmarva Power and Light Company | Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	4	4
Atlantic City Electric Company
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	3	4
Atlantic City Electric Company | Pension and other post retirement benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Costs	$ 3	$ 4

Retirement Benefits - Defined C

Retirement Benefits - Defined Contribution Savings Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	$ 22	$ 21
Commonwealth Edison Co
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	10	9
PECO Energy Co
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	3	3
Baltimore Gas and Electric Company
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	3	2
Pepco Holdings LLC
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	2	3
Potomac Electric Power Company
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	1	1
Delmarva Power and Light Company
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	1	1
Atlantic City Electric Company
Defined Benefit Plan Disclosure [Line Items]
Savings Plan Employer Contributions	$ 0	$ 0

Derivative Financial Instrume_2

Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	Feb. 29, 2024	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (712)	$ (726)
Corporate, Non-Segment | Notes Payable to Banks
Derivative [Line Items]
Derivative, Notional Amount	$ 1,700
Derivative, Cash Received on Hedge	30
PECO Energy Co
Derivative [Line Items]
Incremental Collateral For Loss Of Investment Grade Credit Rating		27
Baltimore Gas and Electric Company
Derivative [Line Items]
Incremental Collateral For Loss Of Investment Grade Credit Rating		47
Delmarva Power and Light Company
Derivative [Line Items]
Incremental Collateral For Loss Of Investment Grade Credit Rating		12
InterestRateSwapNotionalTerminated | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount	1,300
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 33	23
InterestRateSwapNotional5YR | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		145	655
InterestRateSwapNotional10YR | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		145	655
Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Derivative, Notional Amount		$ 290	1,310
Interest Rate Cap | Economic Hedges
Derivative [Line Items]
Derivative, Notional Amount			1,000
Constant Maturity Treasury Interest Rate Swaps | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Total mark-to-market derivative liabilities			(22)
Constant Maturity Treasury Interest Rate Swaps | Not Designated as Hedging Instrument, Economic Hedge [Member] | 2023
Derivative [Line Items]
Derivative, Notional Amount			$ 4,875

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - MWh MWh in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2024
Commonwealth Edison Co
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Long-term Purchase Commitment, Minimum Energy Volume Required	1.3
PECO Energy Co
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated Percent of Gas Purchases Being Hedged		10%
Baltimore Gas and Electric Company | Minimum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated Percent of Gas Purchases Being Hedged		10%
Baltimore Gas and Electric Company | Maximum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated Percent of Gas Purchases Being Hedged		20%
Delmarva Power and Light Company
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Estimated Percent of Gas Purchases Being Hedged		50%

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Interest Rate Hedge Balances (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Mark-to-market derivative liabilities (noncurrent liabilities)	$ 80	$ 106
Mark-to-market derivative liabilities (current liabilities)	29	74
Interest Rate Contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other deferred debits (noncurrent assets)	2
Other current assets		12
Total derivative assets	2	12
Mark-to-market derivative liabilities (noncurrent liabilities)	1
Mark-to-market derivative liabilities (current liabilities)		46
Total mark-to-market derivative liabilities	(1)	(46)
Total mark-to-market derivative net assets	1	(34)
Interest Rate Contract | Derivatives Designated as Hedging Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other deferred debits (noncurrent assets)	2
Other current assets		11
Total derivative assets	2	11
Mark-to-market derivative liabilities (noncurrent liabilities)	1
Mark-to-market derivative liabilities (current liabilities)		24
Total mark-to-market derivative liabilities	(1)	(24)
Total mark-to-market derivative net assets	1	(13)
Interest Rate Contract | Economic Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other deferred debits (noncurrent assets)	0
Other current assets		1
Total derivative assets	0	1
Mark-to-market derivative liabilities (noncurrent liabilities)	0
Mark-to-market derivative liabilities (current liabilities)		22
Total mark-to-market derivative liabilities	0	(22)
Total mark-to-market derivative net assets	$ 0	$ (21)

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Notional Amounts of Outstanding Derivative Positions (Details) - Cash Flow Hedging - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
InterestRateSwapNotional5YR
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 145	$ 655
InterestRateSwapNotional10YR
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	145	655
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 290	$ 1,310

Derivative Financial Instrume_6

Derivative Financial Instruments - Summary of Economic Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	$ (1)	$ 0
Interest Rate Cap | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	0	0
Interest Rate Cap | Not Designated as Hedging Instrument, Economic Hedge [Member] | Electric Operating Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	0	1
Interest Rate Cap | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 0	$ (1)

Derivative Financial Instrume_7

Derivative Financial Instruments - Summary of Counterparty Collateral (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	$ 516	$ 557
External Counterparties | Commodity Contract [Member] | Collateral [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	156	148
External Counterparties | Commodity Contract [Member] | Collateral [Member] | Commonwealth Edison Co
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	154	146
External Counterparties | Commodity Contract [Member] | Collateral [Member] | PECO Energy Co
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	0	0
External Counterparties | Commodity Contract [Member] | Collateral [Member] | Baltimore Gas and Electric Company
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	1	1
External Counterparties | Commodity Contract [Member] | Collateral [Member] | Pepco Holdings LLC
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	1	1
External Counterparties | Commodity Contract [Member] | Collateral [Member] | Potomac Electric Power Company
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	0	1
External Counterparties | Commodity Contract [Member] | Collateral [Member] | Delmarva Power and Light Company
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	1	0
External Counterparties | Commodity Contract [Member] | Collateral [Member] | Atlantic City Electric Company
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other	$ 1	$ 0

Debt and Credit Agreements (A_3

Debt and Credit Agreements (All Registrants) - Narrative (Details) - USD ($)			3 Months Ended
	May 01, 2024	May 09, 2023	Mar. 31, 2024	Mar. 14, 2024	Oct. 07, 2022	Mar. 23, 2017
Corporate, Non-Segment | ShortTermDebt03232017
Short-term Debt [Line Items]
Short-term bank loans and notes payable						$ 500,000,000
Corporate, Non-Segment | ShortTermDebtAmend2 Mar142024
Short-term Debt [Line Items]
Short-term bank loans and notes payable				$ 350,000,000
Corporate, Non-Segment | ShortTermDebtAmend2 Mar142024 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt instrument, interest rate terms			1.05%
Corporate, Non-Segment | ShortTermDebtAmend7 Mar142024
Short-term Debt [Line Items]
Short-term bank loans and notes payable				$ 150,000,000
Corporate, Non-Segment | ShortTermDebtAmend7 Mar142024 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt instrument, interest rate terms			1.05%
Commonwealth Edison Co | ShortTermDebtSOFRplus100May72024
Short-term Debt [Line Items]
Short-term bank loans and notes payable		$ 400,000,000
Commonwealth Edison Co | ShortTermDebtSOFRplus100May72024 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Short-term Debt [Line Items]
Debt instrument, interest rate terms		1%
Commonwealth Edison Co | ShortTermDebtSOFRplus100June282024 | Subsequent Event [Member]
Short-term Debt [Line Items]
Short-term bank loans and notes payable	$ 400,000,000
Commonwealth Edison Co | ShortTermDebtSOFRplus100June282024 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Subsequent Event [Member]
Short-term Debt [Line Items]
Debt instrument, interest rate terms	1%
Revolving Credit Facility | Corporate, Non-Segment
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			$ 0
Line of credit facility, maximum borrowing capacity			900,000,000
Revolving Credit Facility | Commonwealth Edison Co
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			1,000,000,000
Revolving Credit Facility | PECO Energy Co
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			600,000,000
Revolving Credit Facility | Baltimore Gas and Electric Company
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			600,000,000
Revolving Credit Facility | Potomac Electric Power Company
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			300,000,000
Revolving Credit Facility | Delmarva Power and Light Company
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			300,000,000
Revolving Credit Facility | Atlantic City Electric Company
Short-term Debt [Line Items]
Line of credit facility, maximum amount outstanding during period			0
Line of credit facility, maximum borrowing capacity			$ 300,000,000
Letter of Credit | Commonwealth Edison Co
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity					$ 40,000,000
Letter of Credit | PECO Energy Co
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity					40,000,000
Letter of Credit | Baltimore Gas and Electric Company
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity					15,000,000
Letter of Credit | Potomac Electric Power Company
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity					15,000,000
Letter of Credit | Delmarva Power and Light Company
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity					15,000,000
Letter of Credit | Atlantic City Electric Company
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity					$ 15,000,000

Debt and Credit Agreements (A_4

Debt and Credit Agreements (All Registrants) - Commercial Paper Borrowings (Details) - Commercial Paper - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Short-term Debt [Line Items]
Commercial paper	$ 1,307	$ 1,624
Short-term debt, weighted average interest rate, at point in time	5.53%	5.58%
Corporate
Short-term Debt [Line Items]
Commercial paper	$ 571	$ 527
Commonwealth Edison Co
Short-term Debt [Line Items]
Commercial paper	$ 330	$ 202
Short-term debt, weighted average interest rate, at point in time	5.43%	5.53%
PECO Energy Co
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 165
Short-term debt, weighted average interest rate, at point in time	0%	5.57%
Baltimore Gas and Electric Company
Short-term Debt [Line Items]
Commercial paper	$ 406	$ 336
Short-term debt, weighted average interest rate, at point in time	5.57%	5.59%
Pepco Holdings LLC
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 394
Short-term debt, weighted average interest rate, at point in time	0%	5.60%
Potomac Electric Power Company
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 132
Short-term debt, weighted average interest rate, at point in time	0%	5.59%
Delmarva Power and Light Company
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 63
Short-term debt, weighted average interest rate, at point in time	0%	5.60%
Atlantic City Electric Company
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 199
Short-term debt, weighted average interest rate, at point in time	0%	5.60%

Debt and Credit Agreements (A_5

Debt and Credit Agreements (All Registrants) - Summary of Revolving Credit Agreements (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Commonwealth Edison Co
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
PECO Energy Co
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Baltimore Gas and Electric Company
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Potomac Electric Power Company
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Delmarva Power and Light Company
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Atlantic City Electric Company
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Revolving Credit Facility | Commonwealth Edison Co
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000
Revolving Credit Facility | Commonwealth Edison Co | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1%
Revolving Credit Facility | PECO Energy Co
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600
Revolving Credit Facility | PECO Energy Co | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	0.90%
Revolving Credit Facility | Baltimore Gas and Electric Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600
Revolving Credit Facility | Baltimore Gas and Electric Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	0.90%
Revolving Credit Facility | Potomac Electric Power Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300
Revolving Credit Facility | Potomac Electric Power Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1.075%
Revolving Credit Facility | Delmarva Power and Light Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300
Revolving Credit Facility | Delmarva Power and Light Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1%
Revolving Credit Facility | Atlantic City Electric Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300
Revolving Credit Facility | Atlantic City Electric Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1%
Corporate, Non-Segment | Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Line of credit facility, maximum borrowing capacity	$ 900
Corporate, Non-Segment | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1.275%

Debt and Credit Agreements (A_6

Debt and Credit Agreements (All Registrants) - Issuance of Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 20, 2024
Corporate | Notes515DueMar2029 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.15%
Debt instrument, face amount	$ 650
Corporate | Notes545DueMar2034 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.45%
Debt instrument, face amount	$ 650
Corporate | Note560DueMar2053 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.60%
Debt instrument, face amount	$ 400
Potomac Electric Power Company | Note520DueMar2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.20%
Debt instrument, face amount	$ 375
Potomac Electric Power Company | Notes550DueMar2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.50%
Debt instrument, face amount	$ 300
Delmarva Power and Light Company | Notes524DueMar2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.24%
Debt instrument, face amount	$ 100
Delmarva Power and Light Company | Notes555DueMar2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.55%
Debt instrument, face amount	$ 75
Atlantic City Electric Company | Notes555DueMar2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.55%
Debt instrument, face amount	$ 75
Atlantic City Electric Company | Notes529DueAug2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		5.29%
Debt instrument, face amount		$ 75
Atlantic City Electric Company | Notes549DueAug2039 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		5.49%
Debt instrument, face amount		$ 100

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, 2024	Dec. 31, 2023
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	$ 42,774	$ 41,095
Reported Value Measurement [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	390	390
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	38,039	37,246
Estimate of Fair Value Measurement [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	392	390
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	34,426	33,804
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	3,613	3,442
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	392	390
Long-term debt to financing trusts	390	390
Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	390	390
Commonwealth Edison Co | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	11,487	11,486
Commonwealth Edison Co | Reported Value Measurement [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	205	205
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	9,910	10,210
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	209	208
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	0	0
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	9,910	10,210
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	0	0
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	209	208
Commonwealth Edison Co | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	205	205
PECO Energy Co | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	5,134	5,134
PECO Energy Co | Reported Value Measurement [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	184	184
PECO Energy Co | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	4,391	4,562
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	183	182
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	0	0
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	4,391	4,562
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	0	0
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	183	182
PECO Energy Co | Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt to financing trusts	184	184
Baltimore Gas and Electric Company | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	4,602	4,602
Baltimore Gas and Electric Company | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	4,015	4,145
Baltimore Gas and Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Baltimore Gas and Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	4,015	4,145
Baltimore Gas and Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Pepco Holdings LLC | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	9,153	8,648
Pepco Holdings LLC | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	7,969	7,602
Pepco Holdings LLC | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Pepco Holdings LLC | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	4,356	4,160
Pepco Holdings LLC | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	3,613	3,442
Potomac Electric Power Company | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	4,359	4,096
Potomac Electric Power Company | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	4,119	3,911
Potomac Electric Power Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Potomac Electric Power Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	2,549	2,311
Potomac Electric Power Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	1,570	1,600
Delmarva Power and Light Company | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	2,254	2,080
Delmarva Power and Light Company | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	1,942	1,828
Delmarva Power and Light Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Delmarva Power and Light Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	668	694
Delmarva Power and Light Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	1,274	1,134
Atlantic City Electric Company | Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	1,909	1,833
Atlantic City Electric Company | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	1,697	1,647
Atlantic City Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	0	0
Atlantic City Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	929	939
Atlantic City Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including amounts due within one year)	$ 768	$ 708

Fair Value of Financial Asset_4

Fair Value of Financial Assets and Liabilities - Fair Value Measurements of Assets and Liabilities, Recurring and Nonrecurring (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Mark-to-market derivative liabilities (current liabilities)	$ 29	$ 74
Mark-to-market derivative liabilities (noncurrent liabilities)	80	106
Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	883	618
Assets, Fair Value Disclosure	1,125	861
Deferred Compensation Liability, Current and Noncurrent	(75)	(75)
Total liabilities	184	254
Fair Value, Net Asset (Liability)	941	607
Fair Value, Recurring [Member] | Mark-to-Market Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(108)	(133)
Fair Value, Recurring [Member] | Derivatives Designated as Hedging Instruments Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(1)	(24)
Fair Value, Recurring [Member] | Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	(22)
Fair Value, Recurring [Member] | Interest Rate Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(1)	(46)
Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	271	334
Fair Value, Recurring [Member] | Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	154	149
Fair Value, Recurring [Member] | Other Assets [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	99	174
Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	240	231
Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	68	67
Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	57	53
Fair Value, Recurring [Member] | Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	7
Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	108	104
Fair Value, Recurring [Member] | Derivatives Designated as Hedging Instruments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	2	11
Fair Value, Recurring [Member] | Economic Hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	0	1
Fair Value, Recurring [Member] | Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	2	12
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	883	618
Assets, Fair Value Disclosure	1,008	738
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	1,008	738
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mark-to-Market Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Derivatives Designated as Hedging Instruments Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	125	120
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	68	67
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	57	53
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Derivatives Designated as Hedging Instruments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Economic Hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	0	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	74	80
Deferred Compensation Liability, Current and Noncurrent	(75)	(75)
Total liabilities	76	121
Fair Value, Net Asset (Liability)	(2)	(41)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mark-to-Market Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Derivatives Designated as Hedging Instruments Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(1)	(24)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	(22)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(1)	(46)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	72	68
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	7
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	65	61
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Derivatives Designated as Hedging Instruments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	2	11
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Economic Hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	0	1
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	2	12
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	43	43
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	108	133
Fair Value, Net Asset (Liability)	(65)	(90)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mark-to-Market Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	(108)	(133)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Derivatives Designated as Hedging Instruments Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Economic Hedging Instrument Liabilites [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Derivative Liabilities
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total mark-to-market derivative liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	43	43
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	43	43
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Derivatives Designated as Hedging Instruments
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Economic Hedges
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Derivative Assets
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Total derivative assets	0	0
Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Commonwealth Edison Co
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Mark-to-market derivative liabilities (current liabilities)	29	27
Mark-to-market derivative liabilities (noncurrent liabilities)	79	106
Commonwealth Edison Co | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	398	453
Assets, Fair Value Disclosure	398	453
Total mark-to-market derivative liabilities	(108)	(133)
Deferred Compensation Liability, Current and Noncurrent	(9)	(8)
Total liabilities	117	141
Fair Value, Net Asset (Liability)	281	312
Mark-to-market derivative liabilities (current liabilities)	(29)	27
Mark-to-market derivative liabilities (noncurrent liabilities)	(79)	106
Commonwealth Edison Co | Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	75	86
Commonwealth Edison Co | Fair Value, Recurring [Member] | Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	154	147
Commonwealth Edison Co | Fair Value, Recurring [Member] | Other Assets [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	99	174
Commonwealth Edison Co | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	398	453
Assets, Fair Value Disclosure	398	453
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	398	453
Commonwealth Edison Co | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(9)	(8)
Total liabilities	9	8
Fair Value, Net Asset (Liability)	(9)	(8)
Commonwealth Edison Co | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	(108)	(133)
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	108	133
Fair Value, Net Asset (Liability)	(108)	(133)
Commonwealth Edison Co | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Commonwealth Edison Co | Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
PECO Energy Co | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	14	9
Assets, Fair Value Disclosure	43	36
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(9)	(8)
Total liabilities	9	8
Fair Value, Net Asset (Liability)	34	28
PECO Energy Co | Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	34	42
PECO Energy Co | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	29	27
PECO Energy Co | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	10	9
PECO Energy Co | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	19	18
PECO Energy Co | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	14	9
Assets, Fair Value Disclosure	24	18
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	24	18
PECO Energy Co | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	10	9
PECO Energy Co | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	10	9
PECO Energy Co | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	19	18
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(9)	(8)
Total liabilities	9	8
Fair Value, Net Asset (Liability)	10	10
PECO Energy Co | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	19	18
PECO Energy Co | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	19	18
PECO Energy Co | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
PECO Energy Co | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
PECO Energy Co | Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Baltimore Gas and Electric Company | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	10	9
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(4)	(4)
Total liabilities	4	4
Fair Value, Net Asset (Liability)	6	5
Baltimore Gas and Electric Company | Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	27	47
Baltimore Gas and Electric Company | Fair Value, Recurring [Member] | Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	1
Baltimore Gas and Electric Company | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	10	9
Baltimore Gas and Electric Company | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	10	9
Baltimore Gas and Electric Company | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	10	9
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	10	9
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	10	9
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	10	9
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	(4)	(4)
Total liabilities	4	4
Fair Value, Net Asset (Liability)	(4)	(4)
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Total mark-to-market derivative liabilities	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Baltimore Gas and Electric Company | Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Pepco Holdings LLC | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	438	107
Assets, Fair Value Disclosure	582	249
Deferred Compensation Liability, Current and Noncurrent	(12)	(13)
Total liabilities	12	13
Fair Value, Net Asset (Liability)	570	236
Pepco Holdings LLC | Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	89	96
Pepco Holdings LLC | Fair Value, Recurring [Member] | Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	1
Pepco Holdings LLC | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	144	142
Pepco Holdings LLC | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	65	64
Pepco Holdings LLC | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	9	9
Pepco Holdings LLC | Fair Value, Recurring [Member] | Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	7
Pepco Holdings LLC | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	63	62
Pepco Holdings LLC | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	438	107
Assets, Fair Value Disclosure	512	180
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	512	180
Pepco Holdings LLC | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	74	73
Pepco Holdings LLC | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	65	64
Pepco Holdings LLC | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	9	9
Pepco Holdings LLC | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	29	28
Deferred Compensation Liability, Current and Noncurrent	(12)	(13)
Total liabilities	12	13
Fair Value, Net Asset (Liability)	17	15
Pepco Holdings LLC | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	29	28
Pepco Holdings LLC | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	7	7
Pepco Holdings LLC | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	22	21
Pepco Holdings LLC | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	41	41
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	41	41
Pepco Holdings LLC | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	41	41
Pepco Holdings LLC | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mutual Funds [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Fixed Income Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Pepco Holdings LLC | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	41	41
Pepco Holdings LLC | Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Potomac Electric Power Company | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	192	23
Assets, Fair Value Disclosure	319	148
Deferred Compensation Liability, Current and Noncurrent	(1)	(1)
Total liabilities	1	1
Fair Value, Net Asset (Liability)	318	147
Potomac Electric Power Company | Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	28	48
Potomac Electric Power Company | Fair Value, Recurring [Member] | Restricted cash member [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	1
Potomac Electric Power Company | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	127	125
Potomac Electric Power Company | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	64	63
Potomac Electric Power Company | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	63	62
Potomac Electric Power Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	192	23
Assets, Fair Value Disclosure	256	86
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	256	86
Potomac Electric Power Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	64	63
Potomac Electric Power Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	64	63
Potomac Electric Power Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Potomac Electric Power Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	22	21
Deferred Compensation Liability, Current and Noncurrent	(1)	(1)
Total liabilities	1	1
Fair Value, Net Asset (Liability)	21	20
Potomac Electric Power Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	22	21
Potomac Electric Power Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Potomac Electric Power Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	22	21
Potomac Electric Power Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	41	41
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	41	41
Potomac Electric Power Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	41	41
Potomac Electric Power Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Potomac Electric Power Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	41	41
Potomac Electric Power Company | Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Delmarva Power and Light Company | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	241	1
Assets, Fair Value Disclosure	241	1
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	241	1
Delmarva Power and Light Company | Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	29	15
Delmarva Power and Light Company | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	241	1
Assets, Fair Value Disclosure	241	1
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	241	1
Delmarva Power and Light Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Delmarva Power and Light Company | Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	0	0
Atlantic City Electric Company | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Atlantic City Electric Company | Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	27	21
Atlantic City Electric Company | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Cash equivalents	0	0
Assets, Fair Value Disclosure	0	0
Deferred Compensation Liability, Current and Noncurrent	0	0
Total liabilities	0	0
Fair Value, Net Asset (Liability)	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Rabbi Trust Investments [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Cash Equivalents [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | 6311 Life Insurance [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Investments, Fair Value Disclosure	0	0
Atlantic City Electric Company | Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Assets, Fair Value Disclosure	0	0
Total liabilities	$ 0	$ 0

Fair Value of Financial Asset_5

Fair Value of Financial Assets and Liabilities - Fair Value Assets Liabilities Measured On Recurring Basis Unobservable Input Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Mark-to-market derivative liabilities (current liabilities)	$ 29		$ 74
Mark-to-market derivative liabilities (noncurrent liabilities)	80		106
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	(90)	$ (44)
Total realized / unrealized gains (losses)
Included in net income	0	1
Included in regulatory assets/liabilities	25	(14)
Purchases, sales, issuances and settlements
Ending Balance	(65)	(57)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0	1
Commonwealth Edison Co
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Mark-to-market derivative liabilities (current liabilities)	29		27
Mark-to-market derivative liabilities (noncurrent liabilities)	79		106
Commonwealth Edison Co | Fair Value, Recurring [Member]
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Mark-to-market derivative liabilities (current liabilities)	(29)		27
Mark-to-market derivative liabilities (noncurrent liabilities)	(79)		$ 106
Other current assets	0
Other deferred debits (noncurrent assets)	0
Commonwealth Edison Co | Derivative [Member] | Interest Rate Swap
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Realized Investment Gains (Losses)	12	11
Commonwealth Edison Co | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	(133)	(84)
Total realized / unrealized gains (losses)
Included in net income	0	0
Included in regulatory assets/liabilities	25	(14)
Purchases, sales, issuances and settlements
Ending Balance	(108)	(98)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0	0
Footnotes To Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Abstract]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease)	13	(25)
Pepco Holdings LLC | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	41	40
Total realized / unrealized gains (losses)
Included in net income	0	1
Included in regulatory assets/liabilities	0	0
Purchases, sales, issuances and settlements
Ending Balance	41	41
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	0	1
Potomac Electric Power Company | Fair Value, Inputs, Level 3 [Member] | 6311 Life Insurance [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	41	40
Total realized / unrealized gains (losses)
Included in net income	0	1
Included in regulatory assets/liabilities	0	0
Purchases, sales, issuances and settlements
Ending Balance	41	41
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ 0	$ 1

Fair Value of Financial Asset_6

Fair Value of Financial Assets and Liabilities - Fair Value Inputs Assets Quantitative Information (Details) - Fair Value, Inputs, Level 3 [Member] - Derivative [Member] - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ (108,000,000)	$ (133,000,000)
Discounted Cash Flow [Member] | Minimum [Member]
Derivatives, Fair Value [Line Items]
Fair Value Inputs Forward Power Price	22.68	30.27
Discounted Cash Flow [Member] | Maximum [Member]
Derivatives, Fair Value [Line Items]
Fair Value Inputs Forward Power Price	84.62	73.71
Discounted Cash Flow [Member] | Arithmetic Average [Member]
Derivatives, Fair Value [Line Items]
Fair Value Inputs Forward Power Price	46.94	43.35
Commonwealth Edison Co
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ (108,000,000)	$ (133,000,000)
Commonwealth Edison Co | Discounted Cash Flow [Member] | Minimum [Member]
Derivatives, Fair Value [Line Items]
Fair Value Inputs Forward Power Price	22.68	30.27
Commonwealth Edison Co | Discounted Cash Flow [Member] | Maximum [Member]
Derivatives, Fair Value [Line Items]
Fair Value Inputs Forward Power Price	84.62	73.71
Commonwealth Edison Co | Discounted Cash Flow [Member] | Arithmetic Average [Member]
Derivatives, Fair Value [Line Items]
Fair Value Inputs Forward Power Price	46.94	43.35

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended
	Nov. 30, 2020 USD ($)	Mar. 31, 2024 USD ($) mGPSite
Commonwealth Edison Co
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count | mGPSite		16
Deferred Prosecution Agreement Payments	$ 200
Loss Contingency Accrual		$ 46.2
Customer Refund Liability, Current		38
Commonwealth Edison Co | Illinois Chamber of Commerce
Commitments And Contingencies Additional Narrative Information [Line Items]
Customer Refund Liability, Current		$ 31
PECO Energy Co
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count | mGPSite		6
Baltimore Gas and Electric Company
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count | mGPSite		4
Delmarva Power and Light Company
Commitments And Contingencies Additional Narrative Information [Line Items]
Mgp Site Contingency Monitoring Count | mGPSite		1
Potomac Electric Power Company
Commitments And Contingencies Additional Narrative Information [Line Items]
Environmental Liability - Anacostia		$ 47
Environmental Liability - Buzzard Point		10
Exelon Business Services Co Affiliate
Commitments And Contingencies Additional Narrative Information [Line Items]
Deferred Prosecution Agreement Liability, Current		173
Insurers' Settlement Payment		40
Settling Shareholders' Attorney Fees		$ 10

Commitments and Contingencies_3

Commitments and Contingencies - Merger Commitment (Details) $ in Millions	Mar. 31, 2024 USD ($)
Other Commitments [Line Items]
Other Commitment	$ 629
Pepco Holdings LLC
Other Commitments [Line Items]
Other Commitment	121
Potomac Electric Power Company
Other Commitments [Line Items]
Other Commitment	93
Delmarva Power and Light Company
Other Commitments [Line Items]
Other Commitment	16
Atlantic City Electric Company
Other Commitments [Line Items]
Other Commitment	12
Pepco Holdings Inc [Member]
Other Commitments [Line Items]
Other Commitment	513
Pepco Holdings Inc [Member] | Remaining commitment
Other Commitments [Line Items]
Other Commitment	35
Pepco Holdings Inc [Member] | Pepco Holdings LLC
Other Commitments [Line Items]
Other Commitment	320
Pepco Holdings Inc [Member] | Pepco Holdings LLC | Remaining commitment
Other Commitments [Line Items]
Other Commitment	31
Pepco Holdings Inc [Member] | Potomac Electric Power Company
Other Commitments [Line Items]
Other Commitment	120
Pepco Holdings Inc [Member] | Potomac Electric Power Company | Remaining commitment
Other Commitments [Line Items]
Other Commitment	28
Pepco Holdings Inc [Member] | Delmarva Power and Light Company
Other Commitments [Line Items]
Other Commitment	89
Pepco Holdings Inc [Member] | Delmarva Power and Light Company | Remaining commitment
Other Commitments [Line Items]
Other Commitment	2
Pepco Holdings Inc [Member] | Atlantic City Electric Company
Other Commitments [Line Items]
Other Commitment	111
Pepco Holdings Inc [Member] | Atlantic City Electric Company | Remaining commitment
Other Commitments [Line Items]
Other Commitment	$ 1

Commitments and Contingencies_4

Commitments and Contingencies - Schedule of Commercial Commitments (Details) $ in Millions	Mar. 31, 2024 USD ($)
Other Commitments [Line Items]
Other Commitment	$ 629
Other Commitment, to be Paid, Remainder of Fiscal Year	205
Other Commitment, to be Paid, Year One	24
Other Commitment, to be Paid, Year Two	5
Other Commitment, to be Paid, Year Three	4
Other Commitment, to be Paid, Year Four	84
Other Commitment, to be Paid, Year Five and Beyond	307
Guarantor Obligations, Maximum Exposure, Undiscounted	57
Letters of Credit
Other Commitments [Line Items]
Other Commitment	32
Other Commitment, to be Paid, Remainder of Fiscal Year	24
Other Commitment, to be Paid, Year One	8
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Surety Bonds
Other Commitments [Line Items]
Other Commitment	194
Other Commitment, to be Paid, Remainder of Fiscal Year	181
Other Commitment, to be Paid, Year One	13
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Financing trust guarantees
Other Commitments [Line Items]
Other Commitment	378
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	0
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	78
Other Commitment, to be Paid, Year Five and Beyond	300
Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	25
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	3
Other Commitment, to be Paid, Year Two	5
Other Commitment, to be Paid, Year Three	4
Other Commitment, to be Paid, Year Four	6
Other Commitment, to be Paid, Year Five and Beyond	7
Commonwealth Edison Co
Other Commitments [Line Items]
Other Commitment	253
Other Commitment, to be Paid, Remainder of Fiscal Year	48
Other Commitment, to be Paid, Year One	5
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	200
Commonwealth Edison Co | Letters of Credit
Other Commitments [Line Items]
Other Commitment	17
Other Commitment, to be Paid, Remainder of Fiscal Year	14
Other Commitment, to be Paid, Year One	3
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Commonwealth Edison Co | Surety Bonds
Other Commitments [Line Items]
Other Commitment	36
Other Commitment, to be Paid, Remainder of Fiscal Year	34
Other Commitment, to be Paid, Year One	2
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Commonwealth Edison Co | Financing trust guarantees
Other Commitments [Line Items]
Other Commitment	200
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	0
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	200
PECO Energy Co
Other Commitments [Line Items]
Other Commitment	183
Other Commitment, to be Paid, Remainder of Fiscal Year	1
Other Commitment, to be Paid, Year One	4
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	78
Other Commitment, to be Paid, Year Five and Beyond	100
PECO Energy Co | Letters of Credit
Other Commitments [Line Items]
Other Commitment	3
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	3
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
PECO Energy Co | Surety Bonds
Other Commitments [Line Items]
Other Commitment	2
Other Commitment, to be Paid, Remainder of Fiscal Year	1
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
PECO Energy Co | Financing trust guarantees
Other Commitments [Line Items]
Other Commitment	178
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	0
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	78
Other Commitment, to be Paid, Year Five and Beyond	100
Baltimore Gas and Electric Company
Other Commitments [Line Items]
Other Commitment	10
Other Commitment, to be Paid, Remainder of Fiscal Year	9
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Baltimore Gas and Electric Company | Letters of Credit
Other Commitments [Line Items]
Other Commitment	7
Other Commitment, to be Paid, Remainder of Fiscal Year	7
Other Commitment, to be Paid, Year One	0
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Baltimore Gas and Electric Company | Surety Bonds
Other Commitments [Line Items]
Other Commitment	3
Other Commitment, to be Paid, Remainder of Fiscal Year	2
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Pepco Holdings LLC
Other Commitments [Line Items]
Other Commitment	121
Other Commitment, to be Paid, Remainder of Fiscal Year	91
Other Commitment, to be Paid, Year One	8
Other Commitment, to be Paid, Year Two	5
Other Commitment, to be Paid, Year Three	4
Other Commitment, to be Paid, Year Four	6
Other Commitment, to be Paid, Year Five and Beyond	7
Guarantor Obligations, Maximum Exposure, Undiscounted	57
Pepco Holdings LLC | Surety Bonds
Other Commitments [Line Items]
Other Commitment	96
Other Commitment, to be Paid, Remainder of Fiscal Year	91
Other Commitment, to be Paid, Year One	5
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Pepco Holdings LLC | Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	25
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	3
Other Commitment, to be Paid, Year Two	5
Other Commitment, to be Paid, Year Three	4
Other Commitment, to be Paid, Year Four	6
Other Commitment, to be Paid, Year Five and Beyond	7
Potomac Electric Power Company
Other Commitments [Line Items]
Other Commitment	93
Other Commitment, to be Paid, Remainder of Fiscal Year	84
Other Commitment, to be Paid, Year One	2
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	1
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five and Beyond	2
Guarantor Obligations, Maximum Exposure, Undiscounted	19
Potomac Electric Power Company | Surety Bonds
Other Commitments [Line Items]
Other Commitment	85
Other Commitment, to be Paid, Remainder of Fiscal Year	84
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Potomac Electric Power Company | Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	8
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	1
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five and Beyond	2
Delmarva Power and Light Company
Other Commitments [Line Items]
Other Commitment	16
Other Commitment, to be Paid, Remainder of Fiscal Year	3
Other Commitment, to be Paid, Year One	4
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five and Beyond	3
Guarantor Obligations, Maximum Exposure, Undiscounted	22
Delmarva Power and Light Company | Surety Bonds
Other Commitments [Line Items]
Other Commitment	6
Other Commitment, to be Paid, Remainder of Fiscal Year	3
Other Commitment, to be Paid, Year One	3
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Delmarva Power and Light Company | Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	10
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	2
Other Commitment, to be Paid, Year Three	2
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five and Beyond	3
Atlantic City Electric Company
Other Commitments [Line Items]
Other Commitment	12
Other Commitment, to be Paid, Remainder of Fiscal Year	4
Other Commitment, to be Paid, Year One	2
Other Commitment, to be Paid, Year Two	1
Other Commitment, to be Paid, Year Three	1
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five and Beyond	2
Guarantor Obligations, Maximum Exposure, Undiscounted	16
Atlantic City Electric Company | Surety Bonds
Other Commitments [Line Items]
Other Commitment	5
Other Commitment, to be Paid, Remainder of Fiscal Year	4
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	0
Other Commitment, to be Paid, Year Three	0
Other Commitment, to be Paid, Year Four	0
Other Commitment, to be Paid, Year Five and Beyond	0
Atlantic City Electric Company | Guaranteed lease residual values
Other Commitments [Line Items]
Other Commitment	7
Other Commitment, to be Paid, Remainder of Fiscal Year	0
Other Commitment, to be Paid, Year One	1
Other Commitment, to be Paid, Year Two	1
Other Commitment, to be Paid, Year Three	1
Other Commitment, to be Paid, Year Four	2
Other Commitment, to be Paid, Year Five and Beyond	$ 2
Minimum [Member] | Guaranteed lease residual values
Other Commitments [Line Items]
Lessor, Operating Lease, Term of Contract	1 year
Maximum [Member] | Guaranteed lease residual values
Other Commitments [Line Items]
Lessor, Operating Lease, Term of Contract	9 years

Commitments and Contingencies_5

Commitments and Contingencies - Schedule of Accruals for Environmental Matters (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	$ 413	$ 428
Commonwealth Edison Co
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	293	303
PECO Energy Co
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	27	27
Baltimore Gas and Electric Company
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	14	14
Pepco Holdings LLC
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	76	81
Potomac Electric Power Company
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	74	79
Delmarva Power and Light Company
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	1	1
Atlantic City Electric Company
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	1	1
Accrual For MGP Investigation And Remediation [Member]
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	328	338
Accrual For MGP Investigation And Remediation [Member] | Commonwealth Edison Co
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	292	302
Accrual For MGP Investigation And Remediation [Member] | PECO Energy Co
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	25	25
Accrual For MGP Investigation And Remediation [Member] | Baltimore Gas and Electric Company
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	11	11
Accrual For MGP Investigation And Remediation [Member] | Pepco Holdings LLC
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	0	0
Accrual For MGP Investigation And Remediation [Member] | Potomac Electric Power Company
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	0	0
Accrual For MGP Investigation And Remediation [Member] | Delmarva Power and Light Company
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	0	0
Accrual For MGP Investigation And Remediation [Member] | Atlantic City Electric Company
Site Contingency [Line Items]
Total environmental investigation and remediation reserve	$ 0	$ 0

Shareholders' Equity - Narrativ

Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Dec. 06, 2023	Mar. 31, 2024	Aug. 04, 2022
Equity Distribution Agreement
At-the-Market Program [Line Items]
Stock Issued During Period, Shares, New Issues	3,600,000
Share Price	$ 39.58
Issuance of common stock	$ 140
Common Stock
At-the-Market Program [Line Items]
Equity Distribution Agreement		$ 858	$ 1,000

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Income - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 25,755	$ 24,744
Other comprehensive income (loss), net of income taxes	14	(1)
Ending balance	26,061	25,066
Gains (Losses) on Cash Flow Hedges
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(3)	2
OCI before reclassifications	34	6
Amounts reclassified from AOCI	(1)	0
Other comprehensive income (loss), net of income taxes	33	6
Ending balance	30	8
Pension and Non-Pension Postretirement Benefit Plan Items
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(723)	(640)
OCI before reclassifications	(24)	(10)
Amounts reclassified from AOCI	5	3
Other comprehensive income (loss), net of income taxes	(19)	(7)
Ending balance	(742)	(647)
Total
Movement in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(726)	(638)
OCI before reclassifications	10	(4)
Amounts reclassified from AOCI	4	3
Other comprehensive income (loss), net of income taxes	14	(1)
Ending balance	$ (712)	$ (639)

Changes in Accumulated Other _4

Changes in Accumulated Other Comprehensive Income - Income Taxes Allocated to Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	$ (2)	$ (1)
Pension and Non-Pension Postretirement Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	8	3
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Tax	$ (10)	$ (1)

Supplemental Financial Inform_3

Supplemental Financial Information - Taxes Other Than Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Supplemental Statement of Operations Information [Line Items]
Utility taxes	$ 229	$ 220
Property	105	99
Payroll	34	32
Commonwealth Edison Co
Supplemental Statement of Operations Information [Line Items]
Utility taxes	75	74
Property	9	10
Payroll	9	7
PECO Energy Co
Supplemental Statement of Operations Information [Line Items]
Utility taxes	41	40
Property	4	4
Payroll	5	5
Baltimore Gas and Electric Company
Supplemental Statement of Operations Information [Line Items]
Utility taxes	31	29
Property	53	50
Payroll	5	5
Pepco Holdings LLC
Supplemental Statement of Operations Information [Line Items]
Utility taxes	82	77
Property	38	35
Payroll	7	7
Potomac Electric Power Company
Supplemental Statement of Operations Information [Line Items]
Utility taxes	74	68
Property	26	24
Payroll	2	2
Delmarva Power and Light Company
Supplemental Statement of Operations Information [Line Items]
Utility taxes	8	8
Property	11	11
Payroll	1	1
Atlantic City Electric Company
Supplemental Statement of Operations Information [Line Items]
Utility taxes	0	1
Property	1	0
Payroll	$ 1	$ 1

Supplemental Financial Inform_4

Supplemental Financial Information - Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other, Net [Abstract]
AFUDC - Equity	$ 40	$ 38
Non-service net periodic benefit cost	(7)	(1)
Commonwealth Edison Co
Other, Net [Abstract]
AFUDC - Equity	10	10
Non-service net periodic benefit cost	0	0
PECO Energy Co
Other, Net [Abstract]
AFUDC - Equity	8	6
Non-service net periodic benefit cost	0	0
Baltimore Gas and Electric Company
Other, Net [Abstract]
AFUDC - Equity	7	3
Non-service net periodic benefit cost	0	0
Pepco Holdings LLC
Other, Net [Abstract]
AFUDC - Equity	15	19
Non-service net periodic benefit cost	0	0
Potomac Electric Power Company
Other, Net [Abstract]
AFUDC - Equity	12	14
Non-service net periodic benefit cost	0	0
Delmarva Power and Light Company
Other, Net [Abstract]
AFUDC - Equity	3	2
Non-service net periodic benefit cost	0	0
Atlantic City Electric Company
Other, Net [Abstract]
AFUDC - Equity	0	3
Non-service net periodic benefit cost	$ 0	$ 0

Supplemental Financial Inform_5

Supplemental Financial Information - Cash Flow (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	$ 711	$ 680
Amortization of regulatory assets	166	178
Amortization of intangible assets, net	2	2
Accretion expense	1
Depreciation and amortization	880	860
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	61	45
Allowance for credit losses	63	70
True-up adjustments to decoupling mechanisms and formula rates	106	279
Long-term incentive plan		2
Amortization of operating ROU asset	9	10
Change in environmental liabilities		25
AFUDC - Equity	(40)	(38)
Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(91)	(282)
Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(40)	(38)
Commonwealth Edison Co
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	284	267
Amortization of regulatory assets	78	71
Amortization of intangible assets, net	0	0
Accretion expense	0
Depreciation and amortization	362	338
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	17	6
Allowance for credit losses	2	0
True-up adjustments to decoupling mechanisms and formula rates	19	153
Long-term incentive plan		0
Amortization of operating ROU asset	0	1
Change in environmental liabilities		0
AFUDC - Equity	(10)	(10)
Commonwealth Edison Co | Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(19)	(153)
Commonwealth Edison Co | Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(10)	(10)
PECO Energy Co
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	101	95
Amortization of regulatory assets	3	3
Amortization of intangible assets, net	0	0
Accretion expense	0
Depreciation and amortization	104	98
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	0	(3)
Allowance for credit losses	27	37
True-up adjustments to decoupling mechanisms and formula rates	(2)	(4)
Long-term incentive plan		0
Amortization of operating ROU asset	0	0
Change in environmental liabilities		0
AFUDC - Equity	(8)	(6)
PECO Energy Co | Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	2	4
PECO Energy Co | Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(8)	(6)
Baltimore Gas and Electric Company
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	122	124
Amortization of regulatory assets	28	43
Amortization of intangible assets, net	0	0
Accretion expense	0
Depreciation and amortization	150	167
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	15	14
Allowance for credit losses	12	18
True-up adjustments to decoupling mechanisms and formula rates	43	65
Long-term incentive plan		0
Amortization of operating ROU asset	2	1
Change in environmental liabilities		0
AFUDC - Equity	(7)	(3)
Baltimore Gas and Electric Company | Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(43)	(65)
Baltimore Gas and Electric Company | Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(7)	(3)
Pepco Holdings LLC
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	190	180
Amortization of regulatory assets	56	61
Amortization of intangible assets, net	0	0
Accretion expense	0
Depreciation and amortization	246	241
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	23	24
Allowance for credit losses	22	15
True-up adjustments to decoupling mechanisms and formula rates	46	65
Long-term incentive plan		0
Amortization of operating ROU asset	6	7
Change in environmental liabilities		25
AFUDC - Equity	(15)	(19)
Pepco Holdings LLC | Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(31)	(68)
Pepco Holdings LLC | Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(15)	(19)
Potomac Electric Power Company
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	81	76
Amortization of regulatory assets	26	32
Amortization of intangible assets, net	0	0
Accretion expense	0
Depreciation and amortization	107	108
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	9	8
Allowance for credit losses	16	7
True-up adjustments to decoupling mechanisms and formula rates	29	39
Long-term incentive plan		0
Amortization of operating ROU asset	1	1
Change in environmental liabilities		25
AFUDC - Equity	(12)	(14)
Potomac Electric Power Company | Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(29)	(39)
Potomac Electric Power Company | Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(12)	(14)
Delmarva Power and Light Company
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	52	51
Amortization of regulatory assets	9	9
Amortization of intangible assets, net	0	0
Accretion expense	0
Depreciation and amortization	61	60
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	4	4
Allowance for credit losses	3	5
True-up adjustments to decoupling mechanisms and formula rates	4	9
Long-term incentive plan		0
Amortization of operating ROU asset	2	2
Change in environmental liabilities		0
AFUDC - Equity	(3)	(2)
Delmarva Power and Light Company | Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	4	(11)
Delmarva Power and Light Company | Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	(3)	(2)
Atlantic City Electric Company
Depreciation, Amortization and Accretion [Abstract]
Property, plant and equipment	53	47
Amortization of regulatory assets	21	20
Amortization of intangible assets, net	0	0
Accretion expense	0
Depreciation and amortization	74	67
Other Non-Cash Operating Activities [Abstract]
Pension and non-pension postretirement benefit costs	3	4
Allowance for credit losses	3	3
True-up adjustments to decoupling mechanisms and formula rates	13	17
Long-term incentive plan		0
Amortization of operating ROU asset	1	1
Change in environmental liabilities		0
AFUDC - Equity	0	(3)
Atlantic City Electric Company | Other Non-Cash Activity
Other Non-Cash Operating Activities [Abstract]
True-up adjustments to decoupling mechanisms and formula rates	(6)	(18)
Atlantic City Electric Company | Return on borrowed funds
Other Non-Cash Operating Activities [Abstract]
AFUDC - Equity	$ 0	$ (3)

Supplemental Financial Inform_6

Supplemental Financial Information - Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 720	$ 445	$ 522
Restricted cash	489	482	381
Restricted cash included in other long-term assets	99	174	180
Total cash, restricted cash, and cash equivalents	1,308	1,101	1,083	$ 1,090
Accrued Expenses [Abstract]
Compensation-related accruals	349	661
Taxes accrued	237	221
Interest accrued	408	414
Commonwealth Edison Co
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	100	110	75
Restricted cash	428	402	323
Restricted cash included in other long-term assets	99	174	180
Total cash, restricted cash, and cash equivalents	627	686	578	511
Accrued Expenses [Abstract]
Compensation-related accruals	102	206
Taxes accrued	214	204
Interest accrued	80	148
PECO Energy Co
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	39	42	27
Restricted cash	9	9	9
Restricted cash included in other long-term assets	0	0	0
Total cash, restricted cash, and cash equivalents	48	51	36	68
Accrued Expenses [Abstract]
Compensation-related accruals	46	87
Taxes accrued	93	96
Interest accrued	54	49
Baltimore Gas and Electric Company
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	27	47	20
Restricted cash	0	1	1
Restricted cash included in other long-term assets	0	0	0
Total cash, restricted cash, and cash equivalents	27	48	21	67
Accrued Expenses [Abstract]
Compensation-related accruals	46	81
Taxes accrued	140	75
Interest accrued	59	44
Pepco Holdings LLC
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	504	180	367
Restricted cash	23	24	29
Restricted cash included in other long-term assets	0	0	0
Total cash, restricted cash, and cash equivalents	527	204	396	373
Accrued Expenses [Abstract]
Compensation-related accruals	59	107
Taxes accrued	170	137
Interest accrued	87	72
Potomac Electric Power Company
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	198	48	126
Restricted cash	22	24	27
Restricted cash included in other long-term assets	0	0	0
Total cash, restricted cash, and cash equivalents	220	72	153	99
Accrued Expenses [Abstract]
Compensation-related accruals	19	27
Taxes accrued	135	116
Interest accrued	40	38
Delmarva Power and Light Company
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	269	16	142
Restricted cash	1	0	1
Restricted cash included in other long-term assets	0	0	0
Total cash, restricted cash, and cash equivalents	270	16	143	152
Accrued Expenses [Abstract]
Compensation-related accruals	12	17
Taxes accrued	42	30
Interest accrued	29	13
Atlantic City Electric Company
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	27	21	71
Restricted cash	0	0	0
Restricted cash included in other long-term assets	0	0	0
Total cash, restricted cash, and cash equivalents	27	21	$ 71	$ 72
Accrued Expenses [Abstract]
Compensation-related accruals	8	12
Taxes accrued	16	10
Interest accrued	$ 17	$ 15

Related Party Transactions - BS

Related Party Transactions - BSC and PHISCO Service Companies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Exelon Business Services Co Affiliate
Related Party Transaction [Line Items]
Related party transaction capitalized costs support services	$ 158	$ 175
Exelon Business Services Co Affiliate | Commonwealth Edison Co
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	100	83
Related party transaction capitalized costs support services	71	81
Exelon Business Services Co Affiliate | PECO Energy Co
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	58	51
Related party transaction capitalized costs support services	29	30
Exelon Business Services Co Affiliate | Baltimore Gas and Electric Company
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	59	54
Related party transaction capitalized costs support services	24	24
Exelon Business Services Co Affiliate | Pepco Holdings LLC
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	50	42
Related party transaction capitalized costs support services	34	40
Exelon Business Services Co Affiliate | Potomac Electric Power Company
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	31	27
Related party transaction capitalized costs support services	17	14
Exelon Business Services Co Affiliate | Delmarva Power and Light Company
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	19	17
Related party transaction capitalized costs support services	12	10
Exelon Business Services Co Affiliate | Atlantic City Electric Company
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	16	14
Related party transaction capitalized costs support services	5	14
PHI Service Co Affiliate
Related Party Transaction [Line Items]
Related party transaction capitalized costs support services	29	24
PHI Service Co Affiliate | Pepco Holdings LLC
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	0	0
Related party transaction capitalized costs support services	29	24
PHI Service Co Affiliate | Potomac Electric Power Company
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	33	30
Related party transaction capitalized costs support services	12	11
PHI Service Co Affiliate | Delmarva Power and Light Company
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	25	24
Related party transaction capitalized costs support services	9	7
PHI Service Co Affiliate | Atlantic City Electric Company
Related Party Transaction [Line Items]
Operating and maintenance from affiliates	23	22
Related party transaction capitalized costs support services	$ 8	$ 6

Related Party Transactions - Cu

Related Party Transactions - Current Receivables From/Payables To Affiliates (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Related Party
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	$ 259	$ 251
Accounts payable	5	5
Commonwealth Edison Co | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable	72	72
Commonwealth Edison Co | PECO Energy Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Commonwealth Edison Co | Baltimore Gas And Electric Company Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Commonwealth Edison Co | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Commonwealth Edison Co | Potomac Electric Power Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Commonwealth Edison Co | Delmarva Power and Light Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Commonwealth Edison Co | Atlantic City Electric Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Commonwealth Edison Co | Other Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	3	3
Commonwealth Edison Co | Related Party
Related Party Transaction [Line Items]
Accounts payable	72	72
Receivables from affiliates	3	3
PECO Energy Co | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable	41	39
PECO Energy Co | Commonwealth Edison Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PECO Energy Co | Baltimore Gas And Electric Company Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PECO Energy Co | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PECO Energy Co | Potomac Electric Power Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PECO Energy Co | Delmarva Power and Light Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	1
PECO Energy Co | Atlantic City Electric Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	1
PECO Energy Co | Other Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PECO Energy Co | Related Party
Related Party Transaction [Line Items]
Accounts payable	41	39
Receivables from affiliates	0	2
Baltimore Gas and Electric Company | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable	37	35
Baltimore Gas and Electric Company | Commonwealth Edison Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Baltimore Gas and Electric Company | PECO Energy Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Baltimore Gas and Electric Company | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Baltimore Gas and Electric Company | Potomac Electric Power Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Baltimore Gas and Electric Company | Delmarva Power and Light Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Baltimore Gas and Electric Company | Atlantic City Electric Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Baltimore Gas and Electric Company | Other Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Baltimore Gas and Electric Company | Related Party
Related Party Transaction [Line Items]
Accounts payable	37	35
Receivables from affiliates	0	0
Pepco Holdings LLC | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable	17	15
Pepco Holdings LLC | Related Party
Related Party Transaction [Line Items]
Accounts payable	60	59
Receivables from affiliates	4	3
Potomac Electric Power Company | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable	37	32
Potomac Electric Power Company | Commonwealth Edison Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Potomac Electric Power Company | PECO Energy Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Potomac Electric Power Company | Baltimore Gas And Electric Company Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Potomac Electric Power Company | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Potomac Electric Power Company | Delmarva Power and Light Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Potomac Electric Power Company | Atlantic City Electric Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	1
Potomac Electric Power Company | Other Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	1	1
Potomac Electric Power Company | Related Party
Related Party Transaction [Line Items]
Accounts payable	37	32
Receivables from affiliates	1	2
Delmarva Power and Light Company | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable	25	25
Delmarva Power and Light Company | Commonwealth Edison Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Delmarva Power and Light Company | PECO Energy Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Delmarva Power and Light Company | Baltimore Gas And Electric Company Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Delmarva Power and Light Company | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Delmarva Power and Light Company | Potomac Electric Power Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Delmarva Power and Light Company | Atlantic City Electric Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	1
Delmarva Power and Light Company | Other Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Delmarva Power and Light Company | Related Party
Related Party Transaction [Line Items]
Accounts payable	25	25
Receivables from affiliates	0	1
Atlantic City Electric Company | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable	22	25
Atlantic City Electric Company | Commonwealth Edison Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Atlantic City Electric Company | PECO Energy Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Atlantic City Electric Company | Baltimore Gas And Electric Company Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Atlantic City Electric Company | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Atlantic City Electric Company | Potomac Electric Power Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Atlantic City Electric Company | Delmarva Power and Light Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Atlantic City Electric Company | Other Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	4	3
Atlantic City Electric Company | Related Party
Related Party Transaction [Line Items]
Accounts payable	22	25
Receivables from affiliates	4	3
Business Services Company | Commonwealth Edison Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	66	64
Business Services Company | PECO Energy Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	33	36
Business Services Company | Baltimore Gas And Electric Company Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	35	33
Business Services Company | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	6	5
Business Services Company | Potomac Electric Power Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	19	17
Business Services Company | Delmarva Power and Light Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	13	12
Business Services Company | Atlantic City Electric Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	10	11
Business Services Company | Other Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	1
Business Services Company | Related Party
Related Party Transaction [Line Items]
Receivables from affiliates	182	179
PHI Service Company | Commonwealth Edison Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PHI Service Company | PECO Energy Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PHI Service Company | Baltimore Gas And Electric Company Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PHI Service Company | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
PHI Service Company | Potomac Electric Power Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	17	14
PHI Service Company | Delmarva Power and Light Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	12	11
PHI Service Company | Atlantic City Electric Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	12	11
PHI Service Company | Other Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current		0
PHI Service Company | Related Party
Related Party Transaction [Line Items]
Receivables from affiliates	41	36
Other Legal Entities | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable	8	8
Other Legal Entities | Commonwealth Edison Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	6	8
Other Legal Entities | PECO Energy Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	8	3
Other Legal Entities | Baltimore Gas And Electric Company Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	2	2
Other Legal Entities | Pepco Holdings LLC Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	11	10
Other Legal Entities | Potomac Electric Power Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	1	1
Other Legal Entities | Delmarva Power and Light Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	1
Other Legal Entities | Atlantic City Electric Co Affiliate
Related Party Transaction [Line Items]
Related party transaction, due from (to) related party, current	0	0
Other Legal Entities | Related Party
Related Party Transaction [Line Items]
Receivables from affiliates	$ 28	$ 25

Related Party Transactions - Lo

Related Party Transactions - Long Term Debt to Financing Trusts (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Long-term debt to financing trusts	$ 390	$ 390
ComEd Financing Three Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	206	206
PECO Trust Three Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	81	81
PECO Trust Four Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	103	103
Related Party
Related Party Transaction [Line Items]
Long-term debt to financing trusts	390	390
Commonwealth Edison Co | ComEd Financing Three Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	205	205
Commonwealth Edison Co | PECO Trust Three Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	0	0
Commonwealth Edison Co | PECO Trust Four Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	0	0
Commonwealth Edison Co | Related Party
Related Party Transaction [Line Items]
Long-term debt to financing trusts	205	205
PECO Energy Co | ComEd Financing Three Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	0	0
PECO Energy Co | PECO Trust Three Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	81	81
PECO Energy Co | PECO Trust Four Affiliate
Related Party Transaction [Line Items]
Long-term debt to financing trusts	103	103
PECO Energy Co | Related Party
Related Party Transaction [Line Items]
Long-term debt to financing trusts	$ 184	$ 184