Segment Information Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($) $ in Millions		3 Months Ended									9 Months Ended		12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Mar. 23, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Rate-regulated electric revenues														$ 0	$ 0
Rate-regulated natural gas revenues														0	0
Revenues		$ 8,814	$ 9,403	$ 8,076	$ 9,693	$ 8,384	$ 8,768	$ 7,665	$ 8,747				$ 35,985	33,565	31,366
Operating revenues from affiliates														0	0
Depreciation and amortization													4,353	3,828	3,936
Operating Expenses	[1]												32,143	29,619	28,106
Interest expense, net													1,554	1,560	1,536
Income (loss) before income taxes													2,232	3,782	1,973
Income taxes		26											120	(126)	753
Net income (loss)													2,084	3,876	1,196
Capital expenditures													7,594	7,584	8,553
Assets	[2]	119,666				116,770							119,666	116,770
Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues													4,609	4,428
Rate-regulated natural gas revenues													181	161
Revenues		1,117	1,361	1,076	1,251	1,121	1,310	1,074	1,175				4,805	4,679
Operating revenues from affiliates													15	50
Income (loss) before income taxes													432	578
Income taxes													35	217
Net income (loss)													398	362
Capital expenditures													1,375	1,396
Assets	[3]	21,984				21,247							21,984	21,247
Pepco Holdings LLC [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues												$ 3,463		4,428
Rate-regulated natural gas revenues												92		161
Revenues												3,643		4,679
Operating revenues from affiliates												45	15	50
Income (loss) before income taxes												(58)
Income taxes												3
Net income (loss)											$ (61)	(61)
Capital expenditures												1,008
Pepco Holdings LLC [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues										$ 1,122
Rate-regulated natural gas revenues										57
Revenues										1,153
Operating revenues from affiliates										0
Income (loss) before income taxes										36
Income taxes										17
Net income (loss)										19
Capital expenditures										273
Exelon Generation Co L L C [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues														0	0
Rate-regulated natural gas revenues														0	0
Revenues		5,069	$ 5,278	$ 4,579	$ 5,512	4,657	$ 4,750	$ 4,216	$ 4,878				20,437	18,500	17,757
Operating revenues from affiliates													1,268	1,115	1,439
Income (loss) before income taxes													365	1,455	857
Income taxes													(108)	(1,376)	282
Net income (loss)													443	2,798	550
Capital expenditures													2,242	2,259	3,078
Assets	[4]	47,556				48,457							47,556	48,457
Operating Segments [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1]												16,155	14,227	13,970
Competitive businesses natural gas revenues	[1]												2,710	2,575	2,146
Competitive businesses other revenues	[1]												303	592	207
Rate-regulated electric revenues	[1]												15,344	14,840	13,869
Rate-regulated natural gas revenues	[1]												1,470	1,333	1,166
Shared service and other revenues	[1]												3	0	7
Revenues	[1]												35,985	33,567	31,365
Operating Segments [Member] | Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Revenues	[5]													47
Operating Segments [Member] | Pepco Holdings LLC [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Revenues	[5]											43
Operating Segments [Member] | Pepco Holdings LLC [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Revenues	[5]									0
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates													(1)	7	10
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1]												(1,256)	(1,105)	(1,430)
Competitive businesses natural gas revenues	[1]												(8)	0	0
Competitive businesses other revenues	[1]												(5)	(1)	(4)
Rate-regulated electric revenues	[1]												(45)	(29)	(31)
Rate-regulated natural gas revenues	[1]												(20)	(10)	(13)
Shared service and other revenues	[1]												(1,960)	(1,880)	(1,686)
Revenues	[1]												(3,294)	(3,025)	(3,164)
Operating revenues from affiliates	[6]												1	2	5
Depreciation and amortization													0	0	0
Operating Expenses	[1]												(3,341)	(3,026)	(3,164)
Interest expense, net													0	0	0
Income (loss) before income taxes													(1)	(2)	(5)
Income taxes													0	0	0
Net income (loss)													(1)	(2)	(5)
Capital expenditures													0	0	0
Assets		(9,800)				(10,552)							(9,800)	(10,552)
Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]												(17)	(14)
Rate-regulated natural gas revenues	[7]												0	0
Shared service and other revenues	[7]												(420)	(3)
Revenues	[7]												(437)	(17)
Operating revenues from affiliates													(437)	(19)
Depreciation and amortization													0	(1)
Operating Expenses													(435)	(17)
Interest expense, net													0	(1)
Income (loss) before income taxes													(408)	(404)
Income taxes													(2)	0
Net income (loss)													15	50
Capital expenditures													0	0
Assets		(5,421)				(4,987)							(5,421)	(4,987)
Intersegment Eliminations [Member] | Pepco Holdings LLC [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]											(13)
Rate-regulated natural gas revenues	[7]											0
Shared service and other revenues	[7]											0
Revenues	[7]											(13)
Operating revenues from affiliates												(13)
Depreciation and amortization												0
Operating Expenses												(13)
Interest expense, net												0
Income (loss) before income taxes												71
Income taxes												0
Net income (loss)												45
Capital expenditures												0
Intersegment Eliminations [Member] | Pepco Holdings LLC [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]									(4)
Rate-regulated natural gas revenues	[7]									0
Shared service and other revenues	[7]									0
Revenues	[7]									(4)
Operating revenues from affiliates										(4)
Depreciation and amortization										(4)
Operating Expenses										(3)
Interest expense, net										(2)
Income (loss) before income taxes										(118)
Income taxes										0
Net income (loss)										0
Capital expenditures										0
Exelon Generation Co L L C [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1],[8]												17,411	15,332	15,400
Competitive businesses natural gas revenues	[1],[8]												2,718	2,575	2,146
Competitive businesses other revenues	[1],[8]												308	593	211
Rate-regulated electric revenues	[1],[8]												0	0	0
Rate-regulated natural gas revenues	[1],[8]												0	0	0
Shared service and other revenues	[1],[8]												0	0	0
Revenues	[1],[8]												20,437	18,500	17,757
Depreciation and amortization	[8]												1,797	1,457	1,879
Operating Expenses	[1],[8]												19,510	18,001	16,878
Interest expense, net	[8]												432	440	364
Income (loss) before income taxes	[8]												365	1,455	857
Income taxes	[8]												(108)	(1,376)	282
Net income (loss)	[8]												443	2,798	550
Capital expenditures	[8]												2,242	2,259	3,078
Assets	[8]	47,556				48,457							47,556	48,457
Exelon Generation Co L L C [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[6],[8]												1,269	1,110	1,428
Commonwealth Edison Co [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1]												0	0	0
Competitive businesses natural gas revenues	[1]												0	0	0
Competitive businesses other revenues	[1]												0	0	0
Rate-regulated electric revenues	[1]												5,882	5,536	5,254
Rate-regulated natural gas revenues	[1]												0	0	0
Shared service and other revenues	[1]												0	0	0
Revenues	[1]												5,882	5,536	5,254
Depreciation and amortization													940	850	775
Operating Expenses	[1]												4,741	4,214	4,056
Interest expense, net													347	361	461
Income (loss) before income taxes													832	984	679
Income taxes													168	417	301
Net income (loss)													664	567	378
Capital expenditures													2,126	2,250	2,734
Assets		31,213				29,726							31,213	29,726
Commonwealth Edison Co [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[6]												27	15	15
PECO Energy Co [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1]												0	0	0
Competitive businesses natural gas revenues	[1]												0	0	0
Competitive businesses other revenues	[1]												0	0	0
Rate-regulated electric revenues	[1]												2,470	2,375	2,531
Rate-regulated natural gas revenues	[1]												568	495	463
Shared service and other revenues	[1]												0	0	0
Revenues	[1]												3,038	2,870	2,994
Depreciation and amortization													301	286	270
Operating Expenses	[1]												2,452	2,215	2,292
Interest expense, net													129	126	123
Income (loss) before income taxes													466	538	587
Income taxes													6	104	149
Net income (loss)													460	434	438
Capital expenditures													849	732	686
Assets		10,642				10,170							10,642	10,170
PECO Energy Co [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[6]												8	7	8
Baltimore Gas and Electric Company [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1]												0	0	0
Competitive businesses natural gas revenues	[1]												0	0	0
Competitive businesses other revenues	[1]												0	0	0
Rate-regulated electric revenues	[1]												2,428	2,489	2,609
Rate-regulated natural gas revenues	[1]												741	687	624
Shared service and other revenues	[1]												0	0	0
Revenues	[1]												3,169	3,176	3,233
Depreciation and amortization													483	473	423
Operating Expenses	[1]												2,696	2,562	2,683
Interest expense, net													106	105	103
Income (loss) before income taxes													387	525	468
Income taxes													74	218	174
Net income (loss)													313	307	294
Capital expenditures													959	882	934
Assets		9,716				9,104							9,716	9,104
Baltimore Gas and Electric Company [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[6]												29	16	21
Pepco Holdings LLC [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Revenues												3,643
Pepco Holdings LLC [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Revenues										1,153
Pepco Holdings LLC [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1],[9]												0	0
Competitive businesses natural gas revenues	[1],[9]												0	0
Competitive businesses other revenues	[1],[9]												0	0
Rate-regulated electric revenues	[1],[7],[9]												4,609	4,469
Rate-regulated natural gas revenues	[1],[7],[9]												181	161
Shared service and other revenues	[1],[7],[9]												15	49
Revenues	[1],[7],[9]												4,805	4,679
Depreciation and amortization	[9]												740	675
Operating Expenses	[1],[9]												4,156	3,911
Interest expense, net	[9]												261	245
Income (loss) before income taxes	[9]												432	578
Income taxes	[9]												35	217
Net income (loss)	[9]												398	362
Capital expenditures	[9]												1,375	1,396
Assets		21,984				21,247							21,984	21,247
Pepco Holdings LLC [Member] | Operating Segments [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1],[9]											0
Competitive businesses natural gas revenues	[1],[9]											0
Competitive businesses other revenues	[1],[9]											0
Rate-regulated electric revenues	[1],[7],[9]											3,506
Rate-regulated natural gas revenues	[1],[7],[9]											92
Shared service and other revenues	[1],[7],[9]											45
Revenues	[1],[7],[9]											3,643
Depreciation and amortization	[9]											515
Operating Expenses	[1],[9]											3,549
Interest expense, net	[9]											195
Income (loss) before income taxes	[9]											(58)
Income taxes	[9]											3
Net income (loss)	[9]											(61)
Capital expenditures	[9]											1,008
Assets	[9]	21,984				21,247							21,984	21,247
Pepco Holdings LLC [Member] | Operating Segments [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]									1,096
Rate-regulated natural gas revenues	[7]									57
Shared service and other revenues	[7]									0
Revenues	[7]									1,153
Depreciation and amortization										152
Operating Expenses										1,048
Interest expense, net										65
Income (loss) before income taxes										36
Income taxes										17
Net income (loss)										19
Capital expenditures										273
Pepco Holdings LLC [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[6],[9]												15	50
Pepco Holdings LLC [Member] | Intersegment Eliminations [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[6],[9]											45
Pepco Holdings LLC [Member] | Intersegment Eliminations [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates										0
Potomac Electric Power Company [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]												2,239	2,158
Rate-regulated natural gas revenues	[7]												0	0
Shared service and other revenues	[7]												0	0
Revenues	[7]												2,239	2,158
Depreciation and amortization													385	321
Operating Expenses													1,919	1,760
Interest expense, net													128	121
Income (loss) before income taxes													223	310
Income taxes													13	105
Net income (loss)													210	205
Capital expenditures													656	628
Assets		8,299				7,832							8,299	7,832
Potomac Electric Power Company [Member] | Operating Segments [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]											1,675
Rate-regulated natural gas revenues	[7]											0
Shared service and other revenues	[7]											0
Revenues	[7]											1,675
Depreciation and amortization												224
Operating Expenses												1,577
Interest expense, net												98
Income (loss) before income taxes												36
Income taxes												26
Net income (loss)												10
Capital expenditures												489
Potomac Electric Power Company [Member] | Operating Segments [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]									511
Rate-regulated natural gas revenues	[7]									0
Shared service and other revenues	[7]									0
Revenues	[7]									511
Depreciation and amortization										71
Operating Expenses										443
Interest expense, net										29
Income (loss) before income taxes										47
Income taxes										15
Net income (loss)										32
Capital expenditures										97
Potomac Electric Power Company [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates													6	6
Potomac Electric Power Company [Member] | Intersegment Eliminations [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates												4
Potomac Electric Power Company [Member] | Intersegment Eliminations [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates										1
Delmarva Power & Light Company [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]												1,151	1,139
Rate-regulated natural gas revenues	[7]												181	161
Shared service and other revenues	[7]												0	0
Revenues	[7]												1,332	1,300
Depreciation and amortization													182	167
Operating Expenses													1,143	1,071
Interest expense, net													58	51
Income (loss) before income taxes													142	192
Income taxes													22	71
Net income (loss)													120	121
Capital expenditures													364	428
Assets		4,588				4,357							4,588	4,357
Delmarva Power & Light Company [Member] | Operating Segments [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]											850
Rate-regulated natural gas revenues	[7]											92
Shared service and other revenues	[7]											0
Revenues	[7]											942
Depreciation and amortization												120
Operating Expenses												952
Interest expense, net												38
Income (loss) before income taxes												(30)
Income taxes												5
Net income (loss)												(35)
Capital expenditures												277
Delmarva Power & Light Company [Member] | Operating Segments [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]									279
Rate-regulated natural gas revenues	[7]									56
Shared service and other revenues	[7]									0
Revenues	[7]									335
Depreciation and amortization										37
Operating Expenses										284
Interest expense, net										12
Income (loss) before income taxes										43
Income taxes										17
Net income (loss)										26
Capital expenditures										72
Delmarva Power & Light Company [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates													8	8
Delmarva Power & Light Company [Member] | Intersegment Eliminations [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates												5
Delmarva Power & Light Company [Member] | Intersegment Eliminations [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates										2
Atlantic City Electric Company [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]												1,236	1,186
Rate-regulated natural gas revenues	[7]												0	0
Shared service and other revenues	[7]												0	0
Revenues	[7]												1,236	1,186
Depreciation and amortization													136	146
Operating Expenses													1,087	1,029
Interest expense, net													64	61
Income (loss) before income taxes													87	103
Income taxes													12	26
Net income (loss)													75	77
Capital expenditures													335	312
Assets		3,699				3,445							3,699	3,445
Atlantic City Electric Company [Member] | Operating Segments [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]											989
Rate-regulated natural gas revenues	[7]											0
Shared service and other revenues	[7]											0
Revenues	[7]											989
Depreciation and amortization												128
Operating Expenses												1,000
Interest expense, net												47
Income (loss) before income taxes												(51)
Income taxes												(5)
Net income (loss)												(47)
Capital expenditures												218
Atlantic City Electric Company [Member] | Operating Segments [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7]									268
Rate-regulated natural gas revenues	[7]									0
Shared service and other revenues	[7]									0
Revenues	[7]									268
Depreciation and amortization										37
Operating Expenses										251
Interest expense, net										15
Income (loss) before income taxes										5
Income taxes										1
Net income (loss)										5
Capital expenditures										93
Atlantic City Electric Company [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates													3	2
Atlantic City Electric Company [Member] | Intersegment Eliminations [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates												2
Atlantic City Electric Company [Member] | Intersegment Eliminations [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates										1
Corporate and Other [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Competitive businesses electric revenues	[1],[10]												0	0	0
Competitive businesses natural gas revenues	[1],[10]												0	0	0
Competitive businesses other revenues	[1],[10]												0	0	0
Rate-regulated electric revenues	[1],[10]												0	0	0
Rate-regulated natural gas revenues	[1],[10]												0	0	0
Shared service and other revenues	[1],[10]												1,948	1,831	1,648
Revenues	[1],[10]												1,948	1,831	1,648
Depreciation and amortization	[10]												92	87	74
Operating Expenses	[1],[10]												1,929	1,742	1,812
Interest expense, net	[10]												279	283	290
Income (loss) before income taxes	[10]												(249)	(296)	(555)
Income taxes	[10]												(55)	294	(156)
Net income (loss)	[10]												(193)	(590)	(398)
Capital expenditures	[10]												43	65	113
Assets	[10]	8,355				8,618							8,355	8,618
Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7],[11]												0	0
Rate-regulated natural gas revenues	[7],[11]												0	0
Shared service and other revenues	[7],[11]												435	52
Revenues	[7],[11]												435	52
Depreciation and amortization	[11]												37	42
Operating Expenses	[11]												442	68
Interest expense, net	[11]												11	13
Income (loss) before income taxes	[11]												388	377
Income taxes	[11]												(10)	15
Net income (loss)	[11]												(22)	(91)
Capital expenditures	[11]												20	28
Assets	[11]	$ 10,819				$ 10,600							10,819	10,600
Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7],[11]											5
Rate-regulated natural gas revenues	[7],[11]											0
Shared service and other revenues	[7],[11]											45
Revenues	[7],[11]											50
Depreciation and amortization	[11]											43
Operating Expenses	[11]											33
Interest expense, net	[11]											12
Income (loss) before income taxes	[11]											(84)
Income taxes	[11]											(23)
Net income (loss)	[11]											(34)
Capital expenditures	[11]											24
Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Rate-regulated electric revenues	[7],[11]									42
Rate-regulated natural gas revenues	[7],[11]									1
Shared service and other revenues	[7],[11]									0
Revenues	[7],[11]									43
Depreciation and amortization	[11]									11
Operating Expenses	[11]									73
Interest expense, net	[11]									11
Income (loss) before income taxes	[11]									59
Income taxes	[11]									(16)
Net income (loss)	[11]									(44)
Capital expenditures	[11]									11
Corporate and Other [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[6],[10]												1,942	1,824	1,647
Corporate and Other [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[11]												435	53
Corporate and Other [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member] | Successor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[11]											$ 47
Corporate and Other [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member] | Predecessor [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[11]									$ 0
Generation Mid Atlantic [Member]
Segment Reporting Information [Line Items]
Revenues													5,487	5,540	6,179
Generation Mid Atlantic [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	[12]												5,474	5,515	6,212
Generation Mid Atlantic [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates													13	25	(33)
Generation Midwest [Member]
Segment Reporting Information [Line Items]
Revenues													4,706	4,181	4,412
Generation Midwest [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	[12]												4,717	4,206	4,402
Generation Midwest [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates													(11)	(25)	10
Segment Elimination [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues from affiliates	[6]												$ (3,289)	$ (3,020)	$ (3,159)

[1] Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 23 — Supplemental Financial Information for additional information on total utility taxes.

[2] Exelon’s consolidated assets include $9,667 million and $9,597 million at December 31, 2018 and 2017, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,548 million and $3,618 million at December 31, 2018 and 2017, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 2–Variable Interest Entities for additional information.

[3] PHI’s consolidated total assets include $33 million and $41 million at December 31, 2018 and 2017, respectively, of PHI's consolidated VIE that can only be used to settle the liabilities of the VIE. PHI’s consolidated total liabilities include $69 million and $102 million at December 31, 2018 and 2017, respectively, of PHI's consolidated VIE for which the VIE creditors do not have recourse to PHI. See Note 2 - Variable Interest Entities for additional information.

[4] Generation’s consolidated assets include $9,634 million and $9,556 million at December 31, 2018 and 2017, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,480 million and $3,516 million at December 31, 2018 and 2017, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 2–Variable Interest Entities for additional information.

[5] Includes operating revenues from affiliates of $47 million and $43 million at PHI in 2017 and 2016, respectively.

[6] 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 authoritative guidance. For Exelon, these amounts are included in Operating revenues in the Consolidated Statements of Operations and Comprehensive Income.

[7] Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 23 — Supplemental Financial Information for additional information on total utility taxes.

[8] See Note 25 — Related Party Transactions for additional information on intersegment revenues.

[9] Amounts included represent activity for PHI's successor period, March 24, 2016 through December 31, 2018.

[10] Other primarily includes Exelon’s corporate operations, shared service entities and other financing and investment activities.

[11] Other primarily includes PHI’s corporate operations, shared service entities and other financing and investment activities. For the predecessor periods presented, Other includes the activity of PHI’s unregulated businesses which were distributed to Exelon and Generation as a result of the PHI Merger.

[12] Includes all wholesale and retail electric sales to third parties and affiliated sales to the Utility Registrants