Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating revenues
Revenues from alternative revenue programs		$ 161	$ 171	$ 6
Total operating revenues		19,078	17,938	16,663
Operating expenses
Purchased power and/or fuel from affiliates		159	1,178	1,209
Operating and maintenance		4,673	4,547	4,641
Depreciation and Amortization		3,325	3,033	2,891
Taxes other than income		1,390	1,291	1,232
Total operating expenses		15,761	15,256	14,485
Gain on sales of assets and businesses		(2)	0	13
Operating income (loss)		3,315	2,682	2,191
Other income and (deductions)
Interest Expense, net		(1,422)	(1,264)	(1,282)
Interest expense to affiliates		(25)	(25)	(25)
Other, net		535	261	208
Total other income and (deductions)		(912)	(1,028)	(1,099)
Income (loss) before income taxes		2,403	1,654	1,092
Income taxes		349	38	(7)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		2,054	1,616	1,099
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		117	213	855
Net income (loss)		2,171	1,829	1,954
Net income (loss) attributable to noncontrolling interests		1	123	(9)
Net income (loss) attributable to common shareholders		2,170	1,706	1,963
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic		2,054	1,616	1,099
Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic		116	90	864
Other comprehensive income (loss), net of income taxes
Prior service benefit reclassified to periodic benefit cost		(1)	(4)	(40)
Actuarial loss reclassified to periodic cost		42	223	190
Pension and non-pension postretirement benefit plan valuation adjustment		46	432	(357)
Unrealized (loss) gain on cash flow hedges		2	(1)	(3)
Unrealized (loss) gain on foreign currency translation		0	0	4
Other comprehensive income (loss)		89	650	(206)
Comprehensive income (loss)		2,260	2,479	1,748
Comprehensive income attributable to noncontrolling interests		1	123	(9)
Comprehensive income (loss) attributable to common shareholders		$ 2,259	$ 2,356	$ 1,757
Average shares of common stock outstanding:
Basic Average Number of Shares Outstanding		986	979	976
Assumed Exercise and/or Distributions of Stock-Based Awards		1	1	1
Diluted Average Number of Shares Outstanding	[1]	987	980	977
Income (Loss) from Continuing Operations, Per Basic Share		$ 2.08	$ 1.65	$ 1.13
Income (Loss) from Continuing Operations, Per Diluted Share		2.08	1.65	1.13
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		0.12	0.09	0.88
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		$ 0.12	$ 0.09	$ 0.88
Earnings per average common share from discontinued operations
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0	0	1
Commonwealth Edison Co [Member]
Operating revenues
Revenues from alternative revenue programs		$ 267	$ 42	$ (47)
Operating revenues from affiliates		16	41	37
Total operating revenues		5,761	6,406	5,904
Operating expenses
Purchased power and/or fuel from affiliates		59	383	345
Operating and maintenance		1,094	1,048	1,231
Operating and maintenance from affiliates		318	307	289
Depreciation and Amortization		1,323	1,205	1,133
Taxes other than income		374	320	299
Total operating expenses		4,218	5,151	4,950
Gain on sales of assets and businesses		(2)	0	0
Operating income (loss)		1,541	1,255	954
Other income and (deductions)
Interest Expense, net		(401)	(376)	(369)
Interest expense to affiliates		(13)	(13)	(13)
Other, net		54	48	43
Total other income and (deductions)		(360)	(341)	(339)
Income (loss) before income taxes		1,181	914	615
Income taxes		264	172	177
Net income (loss)		917	742	438
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		917	742	438
PECO Energy Co [Member]
Operating revenues
Revenues from alternative revenue programs		2	26	16
Operating revenues from affiliates		7	21	9
Total operating revenues		3,903	3,198	3,058
Operating expenses
Purchased power and/or fuel from affiliates		33	194	188
Operating and maintenance		791	757	816
Operating and maintenance from affiliates		201	177	159
Depreciation and Amortization		373	348	347
Taxes other than income		202	184	172
Total operating expenses		3,102	2,547	2,512
Operating income (loss)		801	651	546
Other income and (deductions)
Interest Expense, net		(165)	(149)	(136)
Interest expense to affiliates		(12)	(12)	(11)
Other, net		31	26	18
Total other income and (deductions)		(146)	(135)	(129)
Income (loss) before income taxes		655	516	417
Income taxes		79	12	(30)
Net income (loss)		576	504	447
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		576	504	447
Baltimore Gas and Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs		(47)	12	16
Operating revenues from affiliates		15	31	20
Total operating revenues		3,895	3,341	3,098
Operating expenses
Purchased power and/or fuel from affiliates		18	233	311
Operating and maintenance		670	618	617
Operating and maintenance from affiliates		207	193	172
Depreciation and Amortization		630	591	550
Taxes other than income		302	283	268
Total operating expenses		3,376	2,860	2,598
Operating income (loss)		519	481	500
Other income and (deductions)
Interest Expense, net		(152)	(138)	(133)
Other, net		21	30	23
Total other income and (deductions)		(131)	(108)	(110)
Income (loss) before income taxes		388	373	390
Income taxes		8	(35)	41
Net income (loss)		380	408	349
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		380	408	349
Pepco Holdings LLC [Member]
Operating revenues
Revenues from alternative revenue programs		(59)	91	21
Operating revenues from affiliates		10	13	17
Total operating revenues		5,565	5,041	4,663
Operating expenses
Purchased power and/or fuel from affiliates		51	367	366
Operating and maintenance		966	925	940
Operating and maintenance from affiliates		191	179	159
Depreciation and Amortization		938	821	782
Taxes other than income		475	458	450
Total operating expenses		4,734	4,240	4,045
Gain on sales of assets and businesses		0	0	11
Operating income (loss)		831	801	629
Other income and (deductions)
Interest Expense, net		(292)	(267)	(268)
Other, net		78	69	57
Total other income and (deductions)		(214)	(198)	(211)
Income (loss) before income taxes		617	603	418
Income taxes		9	42	(77)
Net income (loss)		608	561	495
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss) attributable to common shareholders		608	561	495
Potomac Electric Power Company [Member]
Operating revenues
Revenues from alternative revenue programs		(31)	53	40
Operating revenues from affiliates		5	5	7
Total operating revenues		2,531	2,274	2,149
Operating expenses
Purchased power and/or fuel from affiliates		39	271	278
Operating and maintenance		284	258	248
Operating and maintenance from affiliates		223	213	205
Depreciation and Amortization		417	403	377
Taxes other than income		382	373	367
Total operating expenses		2,140	1,871	1,799
Gain on sales of assets and businesses		0	0	9
Operating income (loss)		391	403	359
Other income and (deductions)
Interest Expense, net		(150)	(140)	(138)
Other, net		55	48	38
Total other income and (deductions)		(95)	(92)	(100)
Income (loss) before income taxes		296	311	259
Income taxes		(9)	15	(7)
Net income (loss)		305	296	266
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		305	296	266
Delmarva Power & Light Company [Member]
Operating revenues
Revenues from alternative revenue programs		(9)	14	(7)
Operating revenues from affiliates		6	7	9
Total operating revenues		1,595	1,380	1,271
Operating expenses
Purchased power and/or fuel from affiliates		10	79	75
Operating and maintenance		183	183	208
Operating and maintenance from affiliates		166	162	153
Depreciation and Amortization		232	210	191
Taxes other than income		72	67	65
Total operating expenses		1,359	1,161	1,120
Operating income (loss)		236	219	151
Other income and (deductions)
Interest Expense, net		(66)	(61)	(61)
Other, net		13	12	10
Total other income and (deductions)		(53)	(49)	(51)
Income (loss) before income taxes		183	170	100
Income taxes		14	42	(25)
Net income (loss)		169	128	125
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		169	128	125
Atlantic City Electric Company [Member]
Operating revenues
Revenues from alternative revenue programs		(19)	24	(12)
Operating revenues from affiliates		2	2	4
Total operating revenues		1,431	1,388	1,245
Operating expenses
Purchased power and/or fuel from affiliates		2	17	13
Operating and maintenance		189	179	192
Operating and maintenance from affiliates		142	141	134
Depreciation and Amortization		261	179	180
Taxes other than income		9	8	8
Total operating expenses		1,225	1,201	1,123
Gain on sales of assets and businesses		0	0	2
Operating income (loss)		206	187	124
Other income and (deductions)
Interest Expense, net		(66)	(58)	(59)
Other, net		11	4	6
Total other income and (deductions)		(55)	(54)	(53)
Income (loss) before income taxes		151	133	71
Income taxes		3	(13)	(41)
Net income (loss)		148	146	112
Other comprehensive income (loss), net of income taxes
Comprehensive income (loss)		148	146	112
Electricity, US Regulated [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		16,899	16,245	15,236
Operating expenses
Purchased power and/or fuel		5,380	4,703	4,086
Electricity, US Regulated [Member] | Commonwealth Edison Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		5,478	6,323	5,914
Operating expenses
Purchased power and/or fuel		1,050	1,888	1,653
Electricity, US Regulated [Member] | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		3,156	2,613	2,519
Operating expenses
Purchased power and/or fuel		1,160	699	645
Electricity, US Regulated [Member] | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		2,890	2,497	2,323
Operating expenses
Purchased power and/or fuel		1,186	699	509
Electricity, US Regulated [Member] | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		5,376	4,769	4,463
Operating expenses
Purchased power and/or fuel		1,984	1,417	1,279
Electricity, US Regulated [Member] | Potomac Electric Power Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		2,557	2,216	2,102
Operating expenses
Purchased power and/or fuel		795	353	324
Electricity, US Regulated [Member] | Delmarva Power & Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		1,360	1,191	1,107
Operating expenses
Purchased power and/or fuel		567	387	359
Electricity, US Regulated [Member] | Atlantic City Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		1,448	1,362	1,253
Operating expenses
Purchased power and/or fuel		622	677	596
Natural Gas, US Regulated [Member]
Operating revenues
Revenue from Contract with Customer, Excluding Assessed Tax		2,018	1,522	1,421
Operating expenses
Purchased power and/or fuel		834	504	426
Natural Gas, US Regulated [Member] | PECO Energy Co [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		738	538	514
Operating expenses
Purchased power and/or fuel		342	188	185
Natural Gas, US Regulated [Member] | Baltimore Gas and Electric Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		1,037	801	739
Operating expenses
Purchased power and/or fuel		363	243	171
Natural Gas, US Regulated [Member] | Pepco Holdings LLC [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		238	168	162
Operating expenses
Purchased power and/or fuel		129	73	69
Natural Gas, US Regulated [Member] | Delmarva Power & Light Company [Member]
Operating revenues
Revenue from Contract with Customer, Including Assessed Tax		238	168	162
Operating expenses
Purchased power and/or fuel		$ 129	$ 73	$ 69

[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 year ended December 31, 2022 and 2021 and less than 1 million for the years ended December 31, 2020