Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
Operating revenues
Revenues from alternative revenue programs	$ (2)	$ 47	$ 27		$ 176
Total operating revenues	4,239	4,020	9,566		8,652
Operating expenses
Purchased power and/or fuel from affiliates	0	257	159		550
Operating and maintenance	1,109	1,073	2,288		2,155
Depreciation and amortization	830	736	1,647		1,494
Taxes other than income taxes	330	314	684		631
Total operating expenses	3,543	3,444	7,971		7,252
Gain on sales of assets and businesses	(2)	4	(2)		4
Operating income (loss)	694	580	1,593		1,404
Other income and (deductions)
Interest expense, net	(352)	(318)	(684)		(630)
Interest expense to affiliates	(6)	(6)	(13)		(13)
Other, net	175	73	313		131
Total other income and (deductions)	(183)	(251)	(384)		(512)
Income (Loss) before income taxes	511	329	1,209		892
Income taxes	46	3	263		42
Equity in losses of unconsolidated affiliates	0	0	0		1
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	465	326	946		851
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	150	117		(640)
Net income (loss)	465	476	1,063		211
Net income (loss) attributable to noncontrolling interests	0	75	1		99
Net Income (Loss) Available to Common Stockholders, Basic	465	401	1,062		112
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic	465	326	946		851
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	0	75	116		(739)
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic benefit cost	2	(1)	2		(2)
Actuarial loss reclassified to periodic benefit cost	10	56	24		112
Pension and non-pension postretirement benefit plan valuation adjustment	0	0	0		(2)
Unrealized gain (loss) on foreign currency translation	0	2	0		3
Other comprehensive income	12	57	26		111
Comprehensive income	477	533	1,089		322
Comprehensive income attributable to noncontrolling interests	0	75	1		99
Comprehensive income attributable to common shareholders/membership interest	$ 477	$ 458	$ 1,088		$ 223
Average shares of common stock outstanding:
Basic average shares of common stock outstanding	981	978	981		978
Assumed exercise and/or distributions of stock-based awards	1	1	1		1
Diluted average shares of common stock outstanding	982	979	982	[1]	979	[1]
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.47	$ 0.33	$ 0.96		$ 0.87
Income (Loss) from Continuing Operations, Per Diluted Share	0.47	0.33	0.96		0.87
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.08	0.12		(0.76)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	$ 0	$ 0.08	$ 0.12		$ (0.76)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0		0
Commonwealth Edison Co [Member]
Operating revenues
Revenues from alternative revenue programs	$ 35	$ 9	$ 75		$ 64
Operating revenues from affiliates	3	5	8		11
Total operating revenues	1,425	1,517	3,158		3,052
Operating expenses
Purchased power and/or fuel from affiliates	0	79	59		163
Operating and maintenance	258	250	523		495
Related Party Transaction, Expenses from Transactions with Related Party	80	73	166		144
Depreciation and amortization	328	296	649		589
Taxes other than income taxes	90	77	185		153
Total operating expenses	1,039	1,196	2,444		2,406
Gain on sales of assets and businesses	(2)	0	(2)		0
Operating income (loss)	384	321	712		646
Other income and (deductions)
Interest expense, net	(101)	(95)	(197)		(187)
Interest expense to affiliates	(3)	(3)	(7)		(6)
Other, net	13	15	26		22
Total other income and (deductions)	(91)	(83)	(178)		(171)
Income (Loss) before income taxes	293	238	534		475
Income taxes	66	46	119		85
Net income (loss)	227	192	415		390
Other comprehensive income (loss), net of income taxes
Comprehensive income	227	192	415		390
PECO Energy Co [Member]
Operating revenues
Revenues from alternative revenue programs	0	7	6		17
Operating revenues from affiliates	1	2	2		4
Total operating revenues	816	693	1,863		1,582
Operating expenses
Purchased power and/or fuel from affiliates	0	40	33		81
Operating and maintenance	168	166	364		360
Related Party Transaction, Expenses from Transactions with Related Party	47	43	99		83
Depreciation and amortization	93	87	185		173
Taxes other than income taxes	48	49	95		92
Total operating expenses	639	552	1,432		1,231
Operating income (loss)	177	141	431		351
Other income and (deductions)
Interest expense, net	(40)	(39)	(78)		(74)
Interest expense to affiliates	(3)	(3)	(6)		(6)
Other, net	8	7	16		12
Total other income and (deductions)	(35)	(35)	(68)		(68)
Income (Loss) before income taxes	142	106	363		283
Income taxes	9	2	24		12
Net income (loss)	133	104	339		271
Other comprehensive income (loss), net of income taxes
Comprehensive income	133	104	339		271
Baltimore Gas and Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	(20)	(10)	(32)		8
Operating revenues from affiliates	3	7	10		13
Total operating revenues	786	682	1,940		1,656
Operating expenses
Purchased power and/or fuel from affiliates	0	59	18		129
Operating and maintenance	154	147	321		299
Related Party Transaction, Expenses from Transactions with Related Party	51	46	102		91
Depreciation and amortization	152	141	322		293
Taxes other than income taxes	71	67	148		139
Total operating expenses	717	620	1,636		1,372
Operating income (loss)	69	62	304		284
Other income and (deductions)
Interest expense, net	(36)	(34)	(71)		(67)
Other, net	5	9	11		16
Total other income and (deductions)	(31)	(25)	(60)		(51)
Income (Loss) before income taxes	38	37	244		233
Income taxes	1	(8)	10		(21)
Net income (loss)	37	45	234		254
Other comprehensive income (loss), net of income taxes
Comprehensive income	37	45	234		254
Pepco Holdings LLC [Member]
Operating revenues
Revenues from alternative revenue programs	(17)	41	(22)		88
Operating revenues from affiliates	2	4	6		7
Total operating revenues	1,221	1,140	2,626		2,384
Operating expenses
Purchased power and/or fuel from affiliates	0	79	50		177
Operating and maintenance	245	217	493		434
Related Party Transaction, Expenses from Transactions with Related Party	47	39	98		79
Depreciation and amortization	240	194	459		404
Taxes other than income taxes	114	109	233		222
Total operating expenses	1,066	955	2,282		2,013
Operating income (loss)	155	185	344		371
Other income and (deductions)
Interest expense, net	(73)	(67)	(143)		(134)
Other, net	19	20	37		36
Total other income and (deductions)	(54)	(47)	(106)		(98)
Income (Loss) before income taxes	101	138	238		273
Income taxes	1	(3)	8		5
Equity in losses of unconsolidated affiliates	0	0	0		1
Net income (loss)	100	141	230		269
Other comprehensive income (loss), net of income taxes
Comprehensive income attributable to common shareholders/membership interest	100	141	230		269
Potomac Electric Power Company [Member]
Operating revenues
Revenues from alternative revenue programs	(1)	19	(7)		46
Operating revenues from affiliates	2	1	2		3
Total operating revenues	581	523	1,195		1,076
Operating expenses
Purchased power and/or fuel from affiliates	0	57	39		130
Operating and maintenance	72	62	145		118
Related Party Transaction, Expenses from Transactions with Related Party	56	51	115		103
Depreciation and amortization	105	96	213		199
Taxes other than income taxes	92	87	186		177
Total operating expenses	487	429	1,034		895
Operating income (loss)	94	94	161		181
Other income and (deductions)
Interest expense, net	(38)	(35)	(74)		(69)
Other, net	13	13	26		25
Total other income and (deductions)	(25)	(22)	(48)		(44)
Income (Loss) before income taxes	69	72	113		137
Income taxes	(1)	(3)	(3)		3
Net income (loss)	70	75	116		134
Other comprehensive income (loss), net of income taxes
Comprehensive income	70	75	116		134
Delmarva Power and Light Company [Member]
Operating revenues
Revenues from alternative revenue programs	(2)	10	(3)		19
Operating revenues from affiliates	2	2	3		4
Total operating revenues	332	298	763		680
Operating expenses
Purchased power and/or fuel from affiliates	0	17	10		37
Operating and maintenance	45	41	97		85
Related Party Transaction, Expenses from Transactions with Related Party	43	39	84		79
Depreciation and amortization	56	51	113		104
Taxes other than income taxes	17	16	35		33
Total operating expenses	296	255	653		564
Operating income (loss)	36	43	110		116
Other income and (deductions)
Interest expense, net	(17)	(16)	(33)		(30)
Other, net	4	4	6		6
Total other income and (deductions)	(13)	(12)	(27)		(24)
Income (Loss) before income taxes	23	31	83		92
Income taxes	2	1	6		6
Net income (loss)	21	30	77		86
Other comprehensive income (loss), net of income taxes
Comprehensive income	21	30	77		86
Atlantic City Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	(15)	12	(12)		23
Operating revenues from affiliates	1	1	2		1
Total operating revenues	309	319	658		629
Operating expenses
Purchased power and/or fuel from affiliates	0	5	2		9
Operating and maintenance	50	39	97		82
Related Party Transaction, Expenses from Transactions with Related Party	36	34	73		68
Depreciation and amortization	72	40	118		87
Taxes other than income taxes	2	2	4		4
Total operating expenses	283	269	593		552
Operating income (loss)	26	50	65		77
Other income and (deductions)
Interest expense, net	(17)	(14)	(32)		(29)
Other, net	2	0	5		2
Total other income and (deductions)	(15)	(14)	(27)		(27)
Income (Loss) before income taxes	11	36	38		50
Income taxes	0	(1)	1		(1)
Net income (loss)	11	37	37		51
Other comprehensive income (loss), net of income taxes
Comprehensive income	11	37	37		51
Electricity, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	3,934	3,739	8,415		7,609
Operating expenses
Purchased power and/or fuel	1,167	1,006	2,748		2,146
Electricity, US Regulated | Commonwealth Edison Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,387	1,503	3,075		2,977
Operating expenses
Purchased power and/or fuel	283	421	862		862
Electricity, US Regulated | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	707	602	1,441		1,251
Operating expenses
Purchased power and/or fuel	244	145	472		334
Electricity, US Regulated | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	642	560	1,377		1,180
Operating expenses
Purchased power and/or fuel	241	133	526		295
Electricity, US Regulated | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,199	1,071	2,522		2,195
Operating expenses
Purchased power and/or fuel	401	308	888		656
Electricity, US Regulated | Potomac Electric Power Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	580	503	1,200		1,027
Operating expenses
Purchased power and/or fuel	162	76	336		168
Electricity, US Regulated | Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	295	262	643		562
Operating expenses
Purchased power and/or fuel	116	82	253		185
Electricity, US Regulated | Atlantic City Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	323	306	668		605
Operating expenses
Purchased power and/or fuel	123	149	299		302
Natural Gas, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	307	234	1,124		867
Operating expenses
Purchased power and/or fuel	107	58	445		276
Natural Gas, US Regulated | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	108	82	414		310
Operating expenses
Purchased power and/or fuel	39	22	184		108
Natural Gas, US Regulated | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	161	125	585		455
Operating expenses
Purchased power and/or fuel	48	27	199		126
Natural Gas, US Regulated | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	37	24	120		94
Operating expenses
Purchased power and/or fuel	19	9	61		41
Natural Gas, US Regulated | Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	37	24	120		95
Operating expenses
Purchased power and/or fuel	$ 19	$ 9	$ 61		$ 41

[1] The number of stock options not included in the calculation of diluted common shares outstanding due to their antidilutive effect were none for the three and six months ended June 30, 2022 and 2021, respectively