Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating revenues
Revenues from alternative revenue programs	$ 126	$ (2)	$ 404	$ 27
Total operating revenues	4,818	4,239	10,380	9,566
Operating expenses
Depreciation and amortization	866	830	1,727	1,647
Taxes other than income taxes	324	330	679	684
Total operating expenses	4,114	3,543	8,571	7,971
Gain (loss) on sale of assets and businesses	0	(2)	0	(2)
Operating income (loss)	704	694	1,809	1,593
Other income and (deductions)
Interest expense, net	(421)	(352)	(828)	(684)
Other, net	139	175	249	313
Total other income and (deductions)	(288)	(183)	(591)	(384)
Income (Loss) before income taxes	416	511	1,218	1,209
Income taxes	73	46	206	263
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	343	465	1,012	946
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	0	0	117
Net income (loss)	343	465	1,012	1,063
Net income (loss) attributable to noncontrolling interests	0	0	0	1
Net Income (Loss) Available to Common Stockholders, Basic	343	465	1,012	1,062
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic	343	465	1,012	946
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	0	0	0	116
Other comprehensive income, net of income taxes
Prior service benefit reclassified to periodic benefit cost	0	2	0	2
Actuarial loss reclassified to periodic benefit cost	3	10	6	24
Pension and non-pension postretirement benefit plans valuation adjustment	(3)	0	(13)	0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments	9	0	15	0
Other comprehensive income	9	12	8	26
Comprehensive income	352	477	1,020	1,089
Comprehensive income attributable to noncontrolling interests	0	0	0	1
Comprehensive income attributable to common shareholders/membership interest	$ 352	$ 477	$ 1,020	$ 1,088
Average shares of common stock outstanding:
Basic average shares of common stock outstanding	995	981	995	981
Assumed exercise and/or distributions of stock-based awards	1	1	1	1
Diluted average shares of common stock outstanding	996	982	996	982
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.34	$ 0.47	$ 1.02	$ 0.96
Income (Loss) from Continuing Operations, Per Diluted Share	0.34	0.47	1.02	0.96
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0	0	0.12
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	$ 0	$ 0	$ 0	$ 0.12
Related Party
Operating expenses
Purchased power and/or fuel from affiliates	$ 0	$ 0	$ 0	$ 159
Other income and (deductions)
Interest Expense, Other	(6)	(6)	(12)	(13)
Nonrelated Party
Operating expenses
Operating and maintenance	1,197	1,109	2,347	2,288
Commonwealth Edison Co [Member]
Operating revenues
Revenues from alternative revenue programs	118	35	270	75
Total operating revenues	1,901	1,425	3,568	3,158
Operating expenses
Depreciation and amortization	350	328	688	649
Taxes other than income taxes	88	90	182	185
Total operating expenses	1,478	1,039	2,734	2,444
Gain (loss) on sale of assets and businesses	0	(2)	0	(2)
Operating income (loss)	423	384	834	712
Other income and (deductions)
Interest expense, net	(117)	(101)	(230)	(197)
Other, net	17	13	34	26
Total other income and (deductions)	(103)	(91)	(203)	(178)
Income (Loss) before income taxes	320	293	631	534
Income taxes	71	66	142	119
Net income (loss)	249	227	489	415
Other comprehensive income, net of income taxes
Comprehensive income	249	227	489	415
Commonwealth Edison Co [Member] | Related Party
Operating revenues
Revenues from Related Parties	2	3	5	8
Operating expenses
Purchased power and/or fuel from affiliates	0	0	0	59
Operating and maintenance	88	80	171	166
Other income and (deductions)
Interest Expense, Other	(3)	(3)	(7)	(7)
Commonwealth Edison Co [Member] | Nonrelated Party
Operating expenses
Operating and maintenance	267	258	521	523
PECO Energy Co [Member]
Operating revenues
Revenues from alternative revenue programs	(5)	0	(10)	6
Total operating revenues	828	816	1,940	1,863
Operating expenses
Depreciation and amortization	99	93	197	185
Taxes other than income taxes	47	48	97	95
Total operating expenses	687	639	1,590	1,432
Operating income (loss)	141	177	350	431
Other income and (deductions)
Interest expense, net	(45)	(40)	(90)	(78)
Other, net	6	8	15	16
Total other income and (deductions)	(42)	(35)	(82)	(68)
Income (Loss) before income taxes	99	142	268	363
Income taxes	2	9	5	24
Net income (loss)	97	133	263	339
Other comprehensive income, net of income taxes
Comprehensive income	97	133	263	339
PECO Energy Co [Member] | Related Party
Operating revenues
Revenues from Related Parties	2	1	4	2
Operating expenses
Purchased power and/or fuel from affiliates	0	0	0	33
Operating and maintenance	53	47	105	99
Other income and (deductions)
Interest Expense, Other	(3)	(3)	(7)	(6)
PECO Energy Co [Member] | Nonrelated Party
Operating expenses
Operating and maintenance	186	168	405	364
Baltimore Gas and Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	4	(20)	70	(32)
Total operating revenues	797	786	2,053	1,940
Operating expenses
Depreciation and amortization	158	152	325	322
Taxes other than income taxes	76	71	159	148
Total operating expenses	704	717	1,667	1,636
Operating income (loss)	93	69	386	304
Other income and (deductions)
Interest expense, net	(44)	(36)	(88)	(71)
Other, net	5	5	8	11
Total other income and (deductions)	(39)	(31)	(80)	(60)
Income (Loss) before income taxes	54	38	306	244
Income taxes	12	1	65	10
Net income (loss)	42	37	241	234
Other comprehensive income, net of income taxes
Comprehensive income	42	37	241	234
Baltimore Gas and Electric Company [Member] | Related Party
Operating revenues
Revenues from Related Parties	2	3	4	10
Operating expenses
Purchased power and/or fuel from affiliates	0	0	0	18
Operating and maintenance	54	51	108	102
Baltimore Gas and Electric Company [Member] | Nonrelated Party
Operating expenses
Operating and maintenance	144	154	311	321
Pepco Holdings LLC [Member]
Operating revenues
Revenues from alternative revenue programs	9	(17)	74	(22)
Total operating revenues	1,305	1,221	2,841	2,626
Operating expenses
Depreciation and amortization	243	240	484	459
Taxes other than income taxes	112	114	232	233
Total operating expenses	1,126	1,066	2,423	2,282
Operating income (loss)	179	155	418	344
Other income and (deductions)
Interest expense, net	(81)	(73)	(157)	(143)
Other, net	25	19	51	37
Total other income and (deductions)	(56)	(54)	(106)	(106)
Income (Loss) before income taxes	123	101	312	238
Income taxes	20	1	54	8
Net income (loss)	103	100	258	230
Other comprehensive income, net of income taxes
Comprehensive income attributable to common shareholders/membership interest	103	100	258	230
Pepco Holdings LLC [Member] | Related Party
Operating revenues
Revenues from Related Parties	2	2	4	6
Operating expenses
Purchased power and/or fuel from affiliates	0	0	0	50
Operating and maintenance	44	47	86	98
Pepco Holdings LLC [Member] | Nonrelated Party
Operating expenses
Operating and maintenance	260	245	527	493
Potomac Electric Power Company [Member]
Operating revenues
Revenues from alternative revenue programs	7	(1)	46	(7)
Total operating revenues	642	581	1,351	1,195
Operating expenses
Depreciation and amortization	109	105	216	213
Taxes other than income taxes	88	92	183	186
Total operating expenses	541	487	1,151	1,034
Operating income (loss)	101	94	200	161
Other income and (deductions)
Interest expense, net	(43)	(38)	(81)	(74)
Other, net	16	13	33	26
Total other income and (deductions)	(27)	(25)	(48)	(48)
Income (Loss) before income taxes	74	69	152	113
Income taxes	10	(1)	22	(3)
Net income (loss)	64	70	130	116
Other comprehensive income, net of income taxes
Comprehensive income	64	70	130	116
Potomac Electric Power Company [Member] | Related Party
Operating revenues
Revenues from Related Parties	2	2	3	2
Operating expenses
Purchased power and/or fuel from affiliates	0	0	0	39
Operating and maintenance	58	56	115	115
Potomac Electric Power Company [Member] | Nonrelated Party
Operating expenses
Operating and maintenance	82	72	175	145
Delmarva Power and Light Company [Member]
Operating revenues
Revenues from alternative revenue programs	3	(2)	12	(3)
Total operating revenues	349	332	823	763
Operating expenses
Depreciation and amortization	60	56	121	113
Taxes other than income taxes	18	17	37	35
Total operating expenses	305	296	693	653
Operating income (loss)	44	36	130	110
Other income and (deductions)
Interest expense, net	(18)	(17)	(36)	(33)
Other, net	4	4	8	6
Total other income and (deductions)	(14)	(13)	(28)	(27)
Income (Loss) before income taxes	30	23	102	83
Income taxes	5	2	17	6
Net income (loss)	25	21	85	77
Other comprehensive income, net of income taxes
Comprehensive income	25	21	85	77
Delmarva Power and Light Company [Member] | Related Party
Operating revenues
Revenues from Related Parties	2	2	3	3
Operating expenses
Purchased power and/or fuel from affiliates	0	0	0	10
Operating and maintenance	43	43	84	84
Delmarva Power and Light Company [Member] | Nonrelated Party
Operating expenses
Operating and maintenance	45	45	91	97
Atlantic City Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	(1)	(15)	16	(12)
Total operating revenues	317	309	670	658
Operating expenses
Depreciation and amortization	68	72	135	118
Taxes other than income taxes	3	2	4	4
Total operating expenses	280	283	577	593
Operating income (loss)	37	26	93	65
Other income and (deductions)
Interest expense, net	(17)	(17)	(34)	(32)
Other, net	4	2	9	5
Total other income and (deductions)	(13)	(15)	(25)	(27)
Income (Loss) before income taxes	24	11	68	38
Income taxes	6	0	17	1
Net income (loss)	18	11	51	37
Other comprehensive income, net of income taxes
Comprehensive income	18	11	51	37
Atlantic City Electric Company [Member] | Related Party
Operating revenues
Revenues from Related Parties	1	1	1	2
Operating expenses
Purchased power and/or fuel from affiliates	0	0	0	2
Operating and maintenance	37	36	74	73
Atlantic City Electric Company [Member] | Nonrelated Party
Operating expenses
Operating and maintenance	48	50	91	97
Electricity, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	4,434	3,934	8,896	8,415
Operating expenses
Purchased power and/or fuel	1,669	1,167	3,402	2,748
Electricity, US Regulated | Commonwealth Edison Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,781	1,387	3,293	3,075
Operating expenses
Purchased power and/or fuel	685	283	1,172	862
Electricity, US Regulated | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	723	707	1,521	1,441
Operating expenses
Purchased power and/or fuel	267	244	597	472
Electricity, US Regulated | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	670	642	1,449	1,377
Operating expenses
Purchased power and/or fuel	261	241	604	526
Electricity, US Regulated | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,265	1,199	2,637	2,522
Operating expenses
Purchased power and/or fuel	455	401	1,027	888
Electricity, US Regulated | Potomac Electric Power Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	633	580	1,302	1,200
Operating expenses
Purchased power and/or fuel	204	162	462	336
Electricity, US Regulated | Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	315	295	682	643
Operating expenses
Purchased power and/or fuel	127	116	293	253
Electricity, US Regulated | Atlantic City Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	317	323	653	668
Operating expenses
Purchased power and/or fuel	124	123	273	299
Natural Gas, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	258	307	1,080	1,124
Operating expenses
Purchased power and/or fuel	58	107	416	445
Natural Gas, US Regulated | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	108	108	425	414
Operating expenses
Purchased power and/or fuel	35	39	189	184
Natural Gas, US Regulated | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	121	161	530	585
Operating expenses
Purchased power and/or fuel	11	48	160	199
Natural Gas, US Regulated | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	29	37	126	120
Operating expenses
Purchased power and/or fuel	12	19	67	61
Natural Gas, US Regulated | Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	29	37	126	120
Operating expenses
Purchased power and/or fuel	$ 12	$ 19	$ 67	$ 61