Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013
Current assets
CashAndCashEquivalentsNonvariableInterestEntity	$ 1,362		$ 1,609
Cash and cash equivalents	1,362		1,609		991
Restricted cash and investments	207		167
Accounts receivable, net
Customer	2,973		2,981
Other	1,005		1,175
Mark-to-market derivative assets	629		727
Unamortized energy contracts assets	264		374
Inventories, net
Fossil fuel	409		276
Materials and supplies	1,041		829
Deferred income taxes	426		573
Regulatory assets	732		760
Other	775		666
Total current assets	9,823		10,137
Property, plant and equipment, net	51,747		47,330
Deferred debits and other assets
Regulatory assets	5,545		5,910
Nuclear decommissioning trust funds	10,437		8,071
Investments	839		1,165
Investments in affiliates	22		22
Investment in CENG	0		1,925
Goodwill	2,674		2,625
Mark-to-market derivative assets	482		607
Pledged assets for Zion Station decommissioning	402		458		458
Unamortized energy contracts assets	593		710
Other	1,092		964
Deferred income taxes	0				0
Total deferred debits and other assets	22,086		22,457
Total assets	83,656		79,924
Current liabilities
Short-term borrowings	621		341
Long-term debt due within one year	2,047		1,509
Accounts payable	2,633		2,484
Accrued expenses	1,382		1,633
Payables to affiliates	38		116
Deferred income taxes	17		40
Regulatory liabilities	368		327
Mark-to-market derivative liabilities	228		159
Unamortized energy contract liabilities	239		261
Other	994		858
Total current liabilities	8,567		7,728
Long-term debt	18,133		17,623
Long-term debt of variable financing trusts	648		648
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	13,192		12,905
Asset retirement obligations	7,054		5,194
Pension obligations	1,804		1,876
Non-pension postretirement benefit obligations	1,419		2,190
Spent nuclear fuel obligation	1,021		1,021
Regulatory liabilities	4,670		4,388
Mark-to-market derivative liabilities	262		300
Unamortized energy contract liabilities	260		266
Payable for Zion Station decommissioning	264		305
Other	2,133		2,540
Total deferred credits and other liabilities	32,079		30,985
Total liabilities	59,427		56,984
Shareholders' equity
Common stock	16,651		16,741
Treasury stock, at cost (35 and 35 shares held at December 31, 2010 and December 31, 2009, respectively)	(2,327)		(2,327)
Retained earnings	10,435		10,358
Accumulated other comprehensive income (loss), net	(1,906)	[1]	(2,040)	[1]
Total shareholders' equity	22,853		22,732
BGE preference stock not subject to mandatory redemption	193		193
Noncontrolling interest	1,183		15
Total equity	24,229		22,940
Total liabilities and shareholders' equity	83,656		79,924
Member's equity
Accumulated other comprehensive income (loss), net	(1,906)	[1]	(2,040)	[1]
Consolidated Variable Interest Entities
Current assets
Cash and cash equivalents	126		62
Restricted cash and cash equivalents	75		80
Accounts receivable, net
Customer	296		260
Other	133
Inventories, net
Fossil fuel	103		2
Materials and supplies	165
Other	61		53
Total current assets	959		457
Property, plant and equipment, net	4,603		1,171
Deferred debits and other assets
Nuclear decommissioning trust funds	2,030
Goodwill	48
Other	125		127
Total deferred debits and other assets	6,806
Total assets	7,765		1,755
Current liabilities
Short-term borrowings	40
Long-term debt due within one year	84				85
Accounts payable	243		170
Accrued expenses	89		26
Mark-to-market derivative liabilities	24		29
Other	165		5
Total current liabilities	657		320
Long-term debt	258		298
Deferred credits and other liabilities
Asset retirement obligations	1,731
Pension obligations	133
Non-pension postretirement benefit obligations	136
Unamortized energy contract liabilities	12		12		5
Other	178		28
Total deferred credits and other liabilities	2,454		338
Total liabilities	3,111		658
Removal Costs [Member]
Current liabilities
Regulatory liabilities	107		99
Deferred credits and other liabilities
Regulatory liabilities	1,449		1,423
Exelon Generation Co L L C [Member]
Current assets
CashAndCashEquivalentsNonvariableInterestEntity	305		1,258
Cash and cash equivalents	305		1,258		222
Cash and cash equivalents of variable interest entities	0		0
Restricted cash and cash equivalents	88		71
Restricted cash and investments of variable interest entity	0		0
Accounts receivable, net
Customer	1,733		1,689
Other	441		353
Accounts receivable of variable interest entities	0		0
Mark-to-market derivative assets	629		727
Mark-to-market derivative assets with affiliates	0		0
Receivables from affiliates	67		108
Unamortized energy contracts assets	264		374
Inventories, net
Fossil fuel	328		164
Materials and supplies	872		671
Deferred income taxes	476		475
Receivable from Exelon intercompany money pool	0		44
Other	524		505
Total current assets	5,727		6,439
Property, plant and equipment, net	23,743		20,111
Deferred debits and other assets
Nuclear decommissioning trust funds	10,437		8,071
Investments	432		400
Investments in affiliates	0		0
Investment in CENG	0		1,925
Goodwill	49		0
Mark-to-market derivative assets	464		600
Mark-to-market derivative assets with affiliates	0		0
Prepaid pension asset	1,888		1,873
Pledged assets for Zion Station decommissioning	402		458		458
Unamortized energy contracts assets	593		710
Other	687		645
Deferred income taxes	0		0
Total deferred debits and other assets	14,952		14,682
Total assets	44,422		41,232
Current liabilities
Short-term borrowings	53		22
Long-term debt due within one year	52		561
Long-term debt to PECO Energy Transition Trust due within one year	563
Long-term debt of variable interest entities due within one year	0		0
Accounts payable	1,508		1,322
Accounts payable of variable interest entities	0		0
Accrued expenses	819		976
Payables to affiliates	108		181
Borrowings from Exelon intercompany money pool	190
Deferred income taxes	1		25
Mark-to-market derivative liabilities	215		142
Unamortized energy contract liabilities	233		249
Other	473		389
Total current liabilities	4,215		3,867
Long-term debt	5,944		5,645
Long-term debt to affiliate	948		1,523
Long-term debt of variable interest entity	0		0
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	6,334		6,295
Asset retirement obligations	6,907		5,047
Pension obligations	125
Non-pension postretirement benefit obligations	941		850
Spent nuclear fuel obligation	1,021		1,021
Payables to affiliates	2,917		2,740
Mark-to-market derivative liabilities	135		120
Unamortized energy contract liabilities	260				266
Payable for Zion Station decommissioning	264				305
Other	761		811
Total deferred credits and other liabilities	19,665		17,455
Total liabilities	30,772		28,490
Commitments and contingencies	0		0
Shareholders' equity
Accumulated other comprehensive income (loss), net	37	[1]	214	[1]
Noncontrolling interest	1,185		17
Member's equity
Membership interest	8,895		8,898
Undistributed earnings	3,533		3,613
Accumulated other comprehensive income (loss), net	37	[1]	214	[1]
Total member's equity	12,465		12,725
Total equity	13,650		12,742
Total liabilities and equity	44,422		41,232
Exelon Generation Co L L C [Member] | Consolidated Variable Interest Entities
Current assets
Cash and cash equivalents	126		62
Restricted cash and cash equivalents	47		52
Accounts receivable, net
Customer	296		260
Other	133
Inventories, net
Fossil fuel	103		2
Materials and supplies	165
Other	54		42
Total current assets	924		418
Property, plant and equipment, net	4,603		1,171
Deferred debits and other assets
Nuclear decommissioning trust funds	2,030
Goodwill	48
Other	106		106
Total deferred debits and other assets	6,787		1,277
Total assets	7,711		1,695
Current liabilities
Short-term borrowings	40		5
Long-term debt due within one year	5
Accounts payable	243		170
Accrued expenses	86		22
Mark-to-market derivative liabilities	24
Unamortized energy contract liabilities	12		29
Other	165		5
Total current liabilities	575		236
Long-term debt	84		86
Deferred credits and other liabilities
Asset retirement obligations	1,731
Pension obligations	133
Non-pension postretirement benefit obligations	136
Unamortized energy contract liabilities	18		12		5
Other	178		28
Total deferred credits and other liabilities	2,280		126
Total liabilities	2,855		362
Commonwealth Edison Co [Member]
Current assets
CashAndCashEquivalentsNonvariableInterestEntity	38		36
Cash and cash equivalents	38		36		93
Restricted cash and cash equivalents	4		2
Accounts receivable, net
Customer	516		451
Other	428		584
Inventories, net
Inventories, net	112		109
Deferred income taxes	0		0
Receivable from Exelon intercompany money pool	172
Counterparty collateral deposited	0		0
Regulatory assets	304		329
Other	32		29
Total current assets	1,434		1,540
Property, plant and equipment, net	15,121		14,666
Deferred debits and other assets
Regulatory assets	850		933
Investments	1		5
Investments in affiliates	6		6
Goodwill	2,625		2,625
Receivable from affiliate	2,606		2,469
Prepaid pension asset	1,626		1,583
Other	275		291
Total deferred debits and other assets	7,989		7,912
Total assets	24,544		24,118
Current liabilities
Short-term borrowings	498		184
Long-term debt due within one year	260		617
Accounts payable	505		449
Accrued expenses	274		307
Payables to affiliates	37		83
Deferred income taxes	117		16
Customer deposits	130		133
Regulatory liabilities	164		170
Mark-to-market derivative liabilities	13		17
Mark-to-market derivative liabilities with affiliate	0		0
Other	82		72
Total current liabilities	2,080		2,048
Long-term debt	5,448		5,058
Long-term debt of variable financing trusts	206		206
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	4,080		4,116
Asset retirement obligations	100		99
Non-pension postretirement benefit obligations	284		381
Regulatory liabilities	3,686		3,512
Mark-to-market derivative liabilities	121		176
Other	841		994
Total deferred credits and other liabilities	9,112		9,278
Total liabilities	16,846		16,590
Commitments and contingencies	0		0
Shareholders' equity
Common stock	1,588		1,588
Other paid-in capital	5,304		5,190
Retained earnings	806		750
Accumulated other comprehensive income (loss), net	0		0
Total shareholders' equity	7,698		7,528
Total liabilities and shareholders' equity	24,544		24,118
Member's equity
Accumulated other comprehensive income (loss), net	0		0
Commonwealth Edison Co [Member] | Removal Costs [Member]
Current liabilities
Regulatory liabilities	83		78
Deferred credits and other liabilities
Regulatory liabilities	1,248		1,219
PECO Energy Co [Member]
Current assets
CashAndCashEquivalentsNonvariableInterestEntity	93		217
Cash and cash equivalents	93		217		56
Restricted cash and cash equivalents	2		2
Restricted cash and investments of variable interest entity	0		0
Accounts receivable, net
Customer	304		360
Other	107		107
Inventories, net
Fossil fuel	34		60
Materials and supplies	25		21
Deferred income taxes	80		83
Receivable from Exelon intercompany money pool	0		0
Prepaid utility taxes	78		3
Regulatory assets	29		17
Other	51		36
Total current assets	803		906
Property, plant and equipment, net	6,545		6,384
Deferred debits and other assets
Regulatory assets	1,495		1,448
Investments	23		23
Investments in affiliates	8		8
Receivable from affiliate	490		447
Prepaid pension asset	359		363
Other	38		38
Total deferred debits and other assets	2,413		2,327
Total assets	9,761		9,617
Current liabilities
Short-term notes payable - accounts receivable agreement			0
Long-term debt due within one year	250		250
Accounts payable	298		285
Accrued expenses	167		106
Payables to affiliates	37		58
Customer deposits	50		49
Regulatory liabilities	88		106
Other	32		37
Total current liabilities	922		891
Long-term debt	1,947		1,947
Long-term debt of variable financing trusts	184		184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,545		2,487
Asset retirement obligations	30		29
Non-pension postretirement benefit obligations	292		286
Regulatory liabilities	671		629
Other	92		99
Total deferred credits and other liabilities	3,630		3,530
Total liabilities	6,683		6,552
Preferred securities			0
Shareholders' equity
Common stock	2,415		2,415
Retained earnings	662		649
Accumulated other comprehensive income (loss), net	1	[1]	1	[1]
Total shareholders' equity	3,078		3,065
Total liabilities and shareholders' equity	9,761		9,617
Member's equity
Accumulated other comprehensive income (loss), net	1	[1]	1	[1]
PECO Energy Co [Member] | Removal Costs [Member]
Current liabilities
Regulatory liabilities			0
Deferred credits and other liabilities
Regulatory liabilities			0
Baltimore Gas and Electric Company [Member]
Current assets
CashAndCashEquivalentsNonvariableInterestEntity	15		31
Cash and cash equivalents	15		31		457
Restricted cash and cash equivalents	58		28
Accounts receivable, net
Customer	419		480
Other	102		114
Income taxes receivable	44		30
Mark-to-market derivative assets	0		0
Inventories, net
Fossil fuel	48		53
Materials and supplies	33		28
Deferred income taxes	11		2
Prepaid utility taxes	0		57
Regulatory assets	178		181
Other	8		7
Total current assets	916		1,011
Property, plant and equipment, net	6,030		5,864
Deferred debits and other assets
Regulatory assets	499		524
Investments	4		5
Investments in affiliates	8		8
Prepaid pension asset	396		423
Other	24		26
Total deferred debits and other assets	931		986
Total assets	7,877		7,861
Current liabilities
Short-term borrowings	70		135
Long-term debt due within one year	72		70
Accounts payable	205		270
Accrued expenses	95		111
Payables to affiliates	55		55
Deferred income taxes	39		27
Customer deposits	87		76
Regulatory liabilities	63		48
Other	61		35
Total current liabilities	747		827
Long-term debt	1,904		1,941
Long-term debt of variable financing trusts	258		258
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,814		1,773
Asset retirement obligations	17		19
Non-pension postretirement benefit obligations	215		217
Regulatory liabilities	202		204
Other	65		67
Total deferred credits and other liabilities	2,313		2,280
Total liabilities	5,222		5,306
Commitments and contingencies	0		0
Shareholders' equity
Common stock	1,360		1,360
Retained earnings	1,105		1,005
Total shareholders' equity	2,465		2,365
BGE preference stock not subject to mandatory redemption	190		190
Total equity	2,655		2,555
Total liabilities and shareholders' equity	7,877		7,861
Baltimore Gas and Electric Company [Member] | Consolidated Variable Interest Entities
Current assets
Restricted cash and cash equivalents	28		28
Inventories, net
Total current assets	28		28
Deferred debits and other assets
Other	3		3
Total deferred debits and other assets	3		3
Total assets	31		31
Current liabilities
Long-term debt due within one year	72		70
Accrued expenses	4		4
Total current liabilities	76		74
Long-term debt	158		195
Deferred credits and other liabilities
Total deferred credits and other liabilities	158		195
Total liabilities	234		269
Baltimore Gas and Electric Company [Member] | Removal Costs [Member]
Current liabilities
Regulatory liabilities	24		21
Deferred credits and other liabilities
Regulatory liabilities	$ 201		$ 204

[1] (a) All amounts are net of tax. Amounts in parenthesis represent a decrease in accumulated other comprehensive income.