Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating revenues
Revenues from alternative revenue programs	$ 279	$ 29
Total operating revenues	5,563	5,327
Operating expenses
Purchased power and/or fuel from affiliates	0	159
Operating and maintenance	1,151	1,178
Depreciation and amortization	860	817
Taxes other than income taxes	355	354
Total operating expenses	4,457	4,427
Operating income (loss)	1,106	900
Other income and (deductions)
Interest expense, net	(406)	(332)
Interest expense to affiliates	(6)	(6)
Other, net	109	137
Total other income and (deductions)	(303)	(201)
Income (Loss) before income taxes	803	699
Income taxes	134	218
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	669	481
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	117
Net income (loss)	669	598
Net income (loss) attributable to noncontrolling interests	0	1
Net Income (Loss) Available to Common Stockholders, Basic	669	597
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic	669	481
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic	0	116
Other comprehensive income (loss), net of income taxes
Actuarial loss reclassified to periodic benefit cost	3	14
Pension and non-pension postretirement benefit plan valuation adjustment	(10)	0
Unrealized (loss) gain on cash flow hedges	6	0
Other comprehensive (loss) income	(1)	14
Comprehensive income	668	612
Comprehensive income attributable to noncontrolling interests	0	1
Comprehensive income attributable to common shareholders/membership interest	$ 668	$ 611
Average shares of common stock outstanding:
Basic average shares of common stock outstanding	995	981
Assumed exercise and/or distributions of stock-based awards	1	0
Diluted average shares of common stock outstanding	996	981
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.67	$ 0.49
Income (Loss) from Continuing Operations, Per Diluted Share	0.67	0.49
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.12
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	$ 0	$ 0.12
Commonwealth Edison Co [Member]
Operating revenues
Revenues from alternative revenue programs	$ 153	$ 40
Operating revenues from affiliates	3	6
Total operating revenues	1,667	1,734
Operating expenses
Purchased power and/or fuel from affiliates	0	59
Operating and maintenance	254	266
Related Party Transaction, Expenses from Transactions with Related Party	83	85
Depreciation and amortization	338	321
Taxes other than income taxes	93	96
Total operating expenses	1,256	1,406
Operating income (loss)	411	328
Other income and (deductions)
Interest expense, net	(114)	(97)
Interest expense to affiliates	(3)	(3)
Other, net	18	12
Total other income and (deductions)	(99)	(88)
Income (Loss) before income taxes	312	240
Income taxes	71	52
Net income (loss)	241	188
Other comprehensive income (loss), net of income taxes
Comprehensive income	241	188
PECO Energy Co [Member]
Operating revenues
Revenues from alternative revenue programs	(4)	6
Operating revenues from affiliates	2	1
Total operating revenues	1,112	1,047
Operating expenses
Purchased power and/or fuel from affiliates	0	33
Operating and maintenance	219	196
Related Party Transaction, Expenses from Transactions with Related Party	51	51
Depreciation and amortization	98	92
Taxes other than income taxes	50	47
Total operating expenses	902	793
Operating income (loss)	210	254
Other income and (deductions)
Interest expense, net	(45)	(38)
Interest expense to affiliates	(3)	(3)
Other, net	8	7
Total other income and (deductions)	(40)	(34)
Income (Loss) before income taxes	170	220
Income taxes	4	14
Net income (loss)	166	206
Other comprehensive income (loss), net of income taxes
Comprehensive income	166	206
Baltimore Gas and Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	65	(12)
Operating revenues from affiliates	3	7
Total operating revenues	1,257	1,154
Operating expenses
Purchased power and/or fuel from affiliates	0	18
Operating and maintenance	168	167
Related Party Transaction, Expenses from Transactions with Related Party	54	51
Depreciation and amortization	167	171
Taxes other than income taxes	83	76
Total operating expenses	964	919
Operating income (loss)	293	235
Other income and (deductions)
Interest expense, net	(44)	(35)
Other, net	3	7
Total other income and (deductions)	(41)	(28)
Income (Loss) before income taxes	252	207
Income taxes	52	9
Net income (loss)	200	198
Other comprehensive income (loss), net of income taxes
Comprehensive income	200	198
Pepco Holdings LLC [Member]
Operating revenues
Revenues from alternative revenue programs	65	(5)
Operating revenues from affiliates	3	3
Total operating revenues	1,536	1,404
Operating expenses
Purchased power and/or fuel from affiliates	0	50
Operating and maintenance	267	248
Related Party Transaction, Expenses from Transactions with Related Party	42	51
Depreciation and amortization	241	218
Taxes other than income taxes	120	119
Total operating expenses	1,297	1,215
Operating income (loss)	239	189
Other income and (deductions)
Interest expense, net	(76)	(69)
Other, net	26	17
Total other income and (deductions)	(50)	(52)
Income (Loss) before income taxes	189	137
Income taxes	34	7
Net income (loss)	155	130
Other comprehensive income (loss), net of income taxes
Comprehensive income attributable to common shareholders/membership interest	155	130
Potomac Electric Power Company [Member]
Operating revenues
Revenues from alternative revenue programs	39	(7)
Operating revenues from affiliates	1	1
Total operating revenues	710	614
Operating expenses
Purchased power and/or fuel from affiliates	0	39
Operating and maintenance	93	73
Related Party Transaction, Expenses from Transactions with Related Party	57	58
Depreciation and amortization	108	108
Taxes other than income taxes	94	95
Total operating expenses	610	547
Operating income (loss)	100	67
Other income and (deductions)
Interest expense, net	(39)	(36)
Other, net	16	13
Total other income and (deductions)	(23)	(23)
Income (Loss) before income taxes	77	44
Income taxes	12	(2)
Net income (loss)	65	46
Other comprehensive income (loss), net of income taxes
Comprehensive income	65	46
Delmarva Power and Light Company [Member]
Operating revenues
Revenues from alternative revenue programs	9	(1)
Operating revenues from affiliates	2	1
Total operating revenues	474	431
Operating expenses
Purchased power and/or fuel from affiliates	0	10
Operating and maintenance	46	51
Related Party Transaction, Expenses from Transactions with Related Party	41	42
Depreciation and amortization	60	57
Taxes other than income taxes	20	18
Total operating expenses	388	357
Operating income (loss)	86	74
Other income and (deductions)
Interest expense, net	(17)	(16)
Other, net	3	2
Total other income and (deductions)	(14)	(14)
Income (Loss) before income taxes	72	60
Income taxes	12	4
Net income (loss)	60	56
Other comprehensive income (loss), net of income taxes
Comprehensive income	60	56
Atlantic City Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs	17	3
Operating revenues from affiliates	1	1
Total operating revenues	353	349
Operating expenses
Purchased power and/or fuel from affiliates	0	2
Operating and maintenance	44	47
Related Party Transaction, Expenses from Transactions with Related Party	37	37
Depreciation and amortization	67	47
Taxes other than income taxes	2	2
Total operating expenses	298	311
Operating income (loss)	55	38
Other income and (deductions)
Interest expense, net	(16)	(14)
Other, net	5	3
Total other income and (deductions)	(11)	(11)
Income (Loss) before income taxes	44	27
Income taxes	11	1
Net income (loss)	33	26
Other comprehensive income (loss), net of income taxes
Comprehensive income	33	26
Electricity, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	4,462	4,481
Operating expenses
Purchased power and/or fuel	1,733	1,581
Electricity, US Regulated | Commonwealth Edison Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,511	1,688
Operating expenses
Purchased power and/or fuel	488	579
Electricity, US Regulated | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	798	734
Operating expenses
Purchased power and/or fuel	330	229
Electricity, US Regulated | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	780	735
Operating expenses
Purchased power and/or fuel	343	285
Electricity, US Regulated | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	1,371	1,323
Operating expenses
Purchased power and/or fuel	572	487
Electricity, US Regulated | Potomac Electric Power Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	670	620
Operating expenses
Purchased power and/or fuel	258	174
Electricity, US Regulated | Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	366	348
Operating expenses
Purchased power and/or fuel	166	137
Electricity, US Regulated | Atlantic City Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	335	345
Operating expenses
Purchased power and/or fuel	148	176
Natural Gas, US Regulated
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	822	817
Operating expenses
Purchased power and/or fuel	358	338
Natural Gas, US Regulated | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	316	306
Operating expenses
Purchased power and/or fuel	154	145
Natural Gas, US Regulated | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	409	424
Operating expenses
Purchased power and/or fuel	149	151
Natural Gas, US Regulated | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	97	83
Operating expenses
Purchased power and/or fuel	55	42
Natural Gas, US Regulated | Delmarva Power and Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax	97	83
Operating expenses
Purchased power and/or fuel	$ 55	$ 42