Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Operating revenues
Competitive businesses revenues		$ 4,979	$ 5,113
Rate-regulated utility revenues		4,503	4,570
Revenues from alternative revenue programs		(5)	10
Operating revenues from affiliates	[1]	0	0
Total operating revenues		9,477	9,693
Operating expenses
Competitive businesses purchased power and fuel		3,204	3,289
Rate-regulated utility purchased power and fuel		1,349	1,438
Operating and maintenance		2,189	2,384
Depreciation and amortization		1,075	1,091
Taxes other than income		445	446
Total operating expenses		8,262	8,648
Gain on sales of assets and businesses		3	56
Operating income		1,218	1,101
Other income and (deductions)
Interest expense, net		(397)	(365)
Interest expense to affiliates		(6)	(6)
Other, net		467	(28)
Total other income and (deductions)		64	(399)
Income before income taxes		1,282	702
Income taxes		310	59
Equity in losses of unconsolidated affiliates		(6)	(7)
Net income		966	636
Net income attributable to noncontrolling interest		59	51
Net income (loss) attributable to common shareholders		907	585
Other comprehensive (loss) income, net of income taxes
Prior service benefit reclassified to periodic benefit cost		(16)	(17)
Actuarial loss reclassified to periodic benefit cost		36	61
Pension and non-pension postretirement benefit plan valuation adjustment		(38)	18
Unrealized gain on cash flow hedges		0	8
Unrealized (loss) gain on investments in unconsolidated affiliates		(2)	1
Unrealized gain (loss) on foreign currency translation		2	1
Other comprehensive (loss) income		(18)	72
Comprehensive income		948	708
Comprehensive income attributable to noncontrolling interests		58	52
Comprehensive income attributable to common shareholders		$ 890	$ 656
Average shares of common stock outstanding:
Basic average shares of common stock outstanding		971	966
Assumed exercise and/or distributions of stock-based awards		1	2
Diluted average shares of common stock outstanding	[2]	972	968
Earnings per average common share:
Basic earnings per average common share		$ 0.93	$ 0.61
Diluted earnings per average common share		$ 0.93	$ 0.60
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			5
Exelon Generation Co L L C [Member]
Operating revenues
Competitive businesses revenues		$ 4,979	$ 5,114
Operating revenues from affiliates		317	398
Total operating revenues		5,296	5,512
Operating expenses
Competitive businesses purchased power and fuel		3,204	3,289
Purchased power and fuel from affiliates		1	4
Operating and maintenance		1,068	1,178
Operating and maintenance from affiliates		150	161
Depreciation and amortization		405	448
Taxes other than income		135	138
Total operating expenses		4,963	5,218
Gain on sales of assets and businesses		0	53
Operating income		333	347
Other income and (deductions)
Interest expense, net		(102)	(91)
Interest expense to affiliates		(9)	(10)
Other, net		430	(44)
Total other income and (deductions)		319	(145)
Income before income taxes		652	202
Income taxes		224	9
Equity in losses of unconsolidated affiliates		(6)	(7)
Net income		422	186
Net income attributable to noncontrolling interest		59	50
Net income attributable to membership interest		363	136
Other comprehensive (loss) income, net of income taxes
Unrealized gain on cash flow hedges		1	7
Unrealized (loss) gain on investments in unconsolidated affiliates		(2)	1
Unrealized gain (loss) on foreign currency translation		2	(1)
Other comprehensive (loss) income		1	7
Comprehensive income		423	193
Comprehensive income attributable to noncontrolling interests		58	51
Comprehensive income attributable to common shareholders		365	142
Commonwealth Edison Co [Member]
Operating revenues
Electric operating revenues		1,432	1,493
Revenues from alternative revenue programs		(28)	5
Operating revenues from affiliates		4	14
Total operating revenues		1,408	1,512
Operating expenses
Purchased power		388	411
Purchased power and fuel from affiliates		97	194
Operating and maintenance		259	253
Operating and maintenance from affiliates		62	60
Depreciation and amortization		251	228
Taxes other than income		78	77
Total operating expenses		1,135	1,223
Gain on sales of assets and businesses		3	3
Operating income		276	292
Other income and (deductions)
Interest expense, net		(84)	(86)
Interest expense to affiliates		(3)	(3)
Other, net		8	8
Total other income and (deductions)		(79)	(81)
Income before income taxes		197	211
Income taxes		40	46
Net income		157	165
Other comprehensive (loss) income, net of income taxes
Comprehensive income		157	165
PECO Energy Co [Member]
Operating revenues
Electric operating revenues		622	633
Natural gas operating revenues		280	232
Revenues from alternative revenue programs		(3)	(1)
Operating revenues from affiliates		1	2
Total operating revenues		900	866
Operating expenses
Purchased power		152	199
Purchased fuel		135	98
Purchased power and fuel from affiliates		44	36
Operating and maintenance		187	233
Operating and maintenance from affiliates		38	42
Depreciation and amortization		81	75
Taxes other than income		41	41
Total operating expenses		678	724
Operating income		222	142
Other income and (deductions)
Interest expense, net		(30)	(30)
Interest expense to affiliates		(3)	(3)
Other, net		4	2
Total other income and (deductions)		(29)	(31)
Income before income taxes		193	111
Income taxes		25	(2)
Net income		168	113
Other comprehensive (loss) income, net of income taxes
Comprehensive income		168	113
Baltimore Gas and Electric Company [Member]
Operating revenues
Electric operating revenues		652	654
Natural gas operating revenues		308	330
Revenues from alternative revenue programs		10	(13)
Operating revenues from affiliates		6	6
Total operating revenues		976	977
Operating expenses
Purchased power		190	192
Purchased fuel		95	123
Purchased power and fuel from affiliates		75	65
Operating and maintenance		153	184
Operating and maintenance from affiliates		39	37
Depreciation and amortization		136	134
Taxes other than income		68	65
Total operating expenses		756	800
Operating income		220	177
Other income and (deductions)
Interest expense, net		(29)	(25)
Other, net		5	4
Total other income and (deductions)		(24)	(21)
Income before income taxes		196	156
Income taxes		36	28
Net income		160	128
Other comprehensive (loss) income, net of income taxes
Comprehensive income		160	128
Pepco Holdings LLC [Member]
Operating revenues
Electric operating revenues		1,139	1,151
Natural gas operating revenues		71	78
Revenues from alternative revenue programs		15	18
Operating revenues from affiliates		3	4
Total operating revenues		1,228	1,251
Operating expenses
Purchased power		355	374
Purchased fuel		34	41
Purchased power and fuel from affiliates		101	105
Operating and maintenance		239	271
Operating and maintenance from affiliates		33	38
Depreciation and amortization		180	183
Taxes other than income		111	113
Total operating expenses		1,053	1,125
Operating income		175	126
Other income and (deductions)
Interest expense, net		(65)	(63)
Other, net		12	11
Total other income and (deductions)		(53)	(52)
Income before income taxes		122	74
Income taxes		5	9
Net income		117	65
Other comprehensive (loss) income, net of income taxes
Comprehensive income attributable to common shareholders		117	65
Potomac Electric Power Company [Member]
Operating revenues
Electric operating revenues		559	536
Revenues from alternative revenue programs		14	19
Operating revenues from affiliates		2	2
Total operating revenues		575	557
Operating expenses
Purchased power		117	130
Purchased power and fuel from affiliates		70	52
Operating and maintenance		64	73
Operating and maintenance from affiliates		54	57
Depreciation and amortization		94	96
Taxes other than income		92	93
Total operating expenses		491	501
Operating income		84	56
Other income and (deductions)
Interest expense, net		(34)	(31)
Other, net		7	8
Total other income and (deductions)		(27)	(23)
Income before income taxes		57	33
Income taxes		2	2
Net income		55	31
Other comprehensive (loss) income, net of income taxes
Comprehensive income		55	31
Delmarva Power and Light Company [Member]
Operating revenues
Electric operating revenues		307	303
Natural gas operating revenues		71	78
Revenues from alternative revenue programs		0	1
Operating revenues from affiliates		2	2
Total operating revenues		380	384
Operating expenses
Purchased power		107	90
Purchased fuel		34	41
Purchased power and fuel from affiliates		23	46
Operating and maintenance		45	57
Operating and maintenance from affiliates		39	41
Depreciation and amortization		46	45
Taxes other than income		14	15
Total operating expenses		308	335
Operating income		72	49
Other income and (deductions)
Interest expense, net		(15)	(13)
Other, net		3	2
Total other income and (deductions)		(12)	(11)
Income before income taxes		60	38
Income taxes		7	7
Net income		53	31
Other comprehensive (loss) income, net of income taxes
Comprehensive income		53	31
Atlantic City Electric Company [Member]
Operating revenues
Electric operating revenues		271	311
Revenues from alternative revenue programs		1	(2)
Operating revenues from affiliates		1	1
Total operating revenues		273	310
Operating expenses
Purchased power		131	155
Purchased power and fuel from affiliates		8	6
Operating and maintenance		47	54
Operating and maintenance from affiliates		34	36
Depreciation and amortization		31	33
Taxes other than income		1	3
Total operating expenses		252	287
Operating income		21	23
Other income and (deductions)
Interest expense, net		(14)	(16)
Other, net		3	1
Total other income and (deductions)		(11)	(15)
Income before income taxes		10	8
Income taxes		0	1
Net income		10	7
Other comprehensive (loss) income, net of income taxes
Comprehensive income		$ 10	$ 7

[1] Intersegment revenues exclude sales to unconsolidated affiliates. The intersegment profit associated with Generation’s sale of certain products and services by and between Exelon’s segments is not eliminated in consolidation due to the recognition of intersegment profit in accordance with regulatory accounting guidance. For Exelon, these amounts are included in Operating revenues in the Consolidated Statements of Operations and Comprehensive Income.

[2] The number of stock options not included in the calculation of diluted common shares outstanding due to their antidilutive effect was immaterial for the three months ended March 31, 2019 and approximately 5 million for the three months ended March 31, 2018.