Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Operating revenues [Abstract]
Operating revenues							$ 133
Operating revenues from affiliates	0	[1]	2	[1]	0	[2]	2	[2]
Operating revenues	6,912	[3]	6,502	[3]	20,173	[4]	18,725	[4]
Operating expenses
Purchased power and fuel	2,591		2,404		8,943		7,199
Purchased power and fuel from affiliates	57		339		456		944
Operating and maintenance	1,982		1,735		6,005		5,391
Depreciation and amortization	577		530		1,732		1,606
Taxes other than income	306		277		887		825
Total operating expenses	5,513		5,285		18,023		15,965
Equity in earnings (loss) of unconsolidated affiliates	1		37		(20)		7
Gain on consolidation of CENG	0		0		261		0
Operating income	1,400		1,254		2,391		2,767
Other income and (deductions)
Interest expense, net	(247)		(228)		(691)		(1,091)
Interest expense to affiliates, net	(11)		(6)		(31)		(19)
Other, net	354		155		702		311
Total other income and (deductions)	96		(79)		(20)		(799)
Income before income taxes	1,496		1,175		2,371		1,968
Income taxes	422		439		646		733
Net income	1,074		736		1,725		1,235
Net income (loss) attributable to noncontrolling interest, preferred security dividends and redemption and preference stock dividends	81		(2)		121		11
Net income attributable to common shareholders	993		738		1,604		1,224
Pension and non-pension postretirement benefit plans:
Prior service (benefit) cost reclassified to periodic benefit cost	(11)		1		(18)		0
Actuarial loss reclassified to periodic cost	38		49		109		151
Pension and non-pension postretirement benefit plans valuation adjustment	(8)		(8)		240		69
Deferred compensation unit valuation adjustment	0		0		0		10
Unrealized (loss) on cash flow hedges	(19)		(46)		(92)		(169)
Unrealized gain (loss) on equity investments	(3)		16		8		51
Unrealized (loss) on foreign currency translation	(5)		0		(6)		(5)
Unrealized (loss) on marketable securities	(3)		0		(2)		(1)
Reversal of CENG equity method AOCI	0		0		(116)		0
Other comprehensive income (loss)	(11)		12		123	[5]	106	[5]
Comprehensive income	1,063		748		1,848		1,341
Average shares of common stock outstanding:
Average common shares outstanding — basic	861		857		860		856
Average common shares outstanding — diluted	863		860		863		860
Earnings per average common share:
Earnings per share - basic (in usd per share)	$ 1.15		$ 0.86		$ 1.87		$ 1.43
Earnings per average common share - diluted
Earnings per share - diluted (in usd per share)	$ 1.15		$ 0.86		$ 1.86		$ 1.42
Dividends per common share (in usd per share)	$ 0.31		$ 0.31		$ 0.93		$ 1.15
Exelon Generation Co L L C [Member]
Operating revenues [Abstract]
Operating revenues	4,300		3,871		11,944		10,729
Operating revenues from affiliates	112		384		647		1,129
Operating revenues	4,412		4,255		12,591		11,858
Operating expenses
Purchased power and fuel from affiliates	59		342		476		953
Purchased power and fuel	1,821		1,837		6,595		5,341
Operating and maintenance	1,114		936		3,308		2,943
Operating and maintenance from affiliates	152		140		457		434
Depreciation and amortization	253		218		719		643
Taxes other than income	127		98		350		292
Total operating expenses	3,526		3,571		11,905		10,606
Equity in earnings (loss) of unconsolidated affiliates	1		37		(20)		7
Gain on consolidation of CENG	0		0		261		0
Operating income	887		721		927		1,259
Other income and (deductions)
Interest expense, net	(77)		(69)		(224)		(210)
Interest expense to affiliates, net	(12)		(13)		(37)		(47)
Other, net	342		134		661		229
Total other income and (deductions)	253		52		400		(28)
Income before income taxes	1,140		773		1,327		1,231
Income taxes	291		288		290		436
Net income	849		485		1,037		795
Net income (loss) attributable to noncontrolling interests	78		(5)		111		(6)
Net income attributable to membership interest	771		490		926		801
Pension and non-pension postretirement benefit plans:
Unrealized (loss) on cash flow hedges	(16)		(49)		(86)		(316)
Unrealized gain (loss) on equity investments	(3)		16		8		52
Unrealized (loss) on foreign currency translation	(5)		1		(6)		(5)
Unrealized (loss) on marketable securities	(2)		0		(3)		(1)
Reversal of CENG equity method AOCI	0		0		(116)		0
Other comprehensive income (loss)	(26)		(32)		(203)	[5]	(270)	[5]
Comprehensive income	823		453		834		525
Commonwealth Edison Co [Member]
Operating revenues [Abstract]
Operating revenues	1,221		1,155		3,482		3,393
Operating revenues from affiliates	1		1		2		2
Operating revenues	1,222		1,156		3,484		3,395
Operating expenses
Purchased power and fuel	325		158		741		522
Purchased power and fuel from affiliates	1		143		174		409
Operating and maintenance	320		296		923		907
Operating and maintenance from affiliates	39		37		117		113
Depreciation and amortization	174		164		521		501
Taxes other than income	76		80		225		225
Total operating expenses	935		878		2,701		2,677
Operating income	287		278		783		718
Other income and (deductions)
Interest expense, net	(78)		(71)		(231)		(493)
Interest expense to affiliates, net	(3)		(3)		(10)		(10)
Other, net	4		7		14		18
Total other income and (deductions)	(77)		(67)		(227)		(485)
Income before income taxes	210		211		556		233
Income taxes	84		85		221		93
Net income	126		126		335		140
Pension and non-pension postretirement benefit plans:
Comprehensive income	126		126		335		140
PECO Energy Co [Member]
Operating revenues [Abstract]
Operating revenues	693		727		2,342		2,294
Operating revenues from affiliates	0		1		1		1
Operating revenues	693		728		2,343		2,295
Operating expenses
Purchased power and fuel	228		207		798		632
Purchased power and fuel from affiliates	27		82		162		321
Operating and maintenance	181		162		597		480
Operating and maintenance from affiliates	23		24		71		74
Depreciation and amortization	59		57		176		171
Taxes other than income	42		41		122		121
Total operating expenses	560		573		1,926		1,799
Equity in earnings (loss) of unconsolidated affiliates							0
Operating income	133		155		417		496
Other income and (deductions)
Interest expense, net	(26)		(26)		(76)		(77)
Interest expense to affiliates, net	(3)		(3)		(9)		(9)
Other, net	2		1		5		4
Total other income and (deductions)	(27)		(28)		(80)		(82)
Income before income taxes	106		127		337		414
Income taxes	25		35		82		122
Net income	81		92		255		292
Preferred security dividends and redemption	0		0		0		7
Net income attributable to common shareholders	81		92		255		285
Pension and non-pension postretirement benefit plans:
Comprehensive income	81		92		255		292
Baltimore Gas and Electric Company [Member]
Operating revenues [Abstract]
Operating revenues	694		735		2,383		2,261
Operating revenues from affiliates	3		2		21		10
Operating revenues	697		737		2,404		2,271
Operating expenses
Purchased power and fuel	216		202		808		703
Purchased power and fuel from affiliates	81		144		286		356
Operating and maintenance	142		125		468		391
Operating and maintenance from affiliates	23		21		73		59
Depreciation and amortization	78		78		275		252
Taxes other than income	55		53		168		162
Total operating expenses	595		623		2,078		1,923
Equity in earnings (loss) of unconsolidated affiliates							0
Operating income	102		114		326		348
Other income and (deductions)
Interest expense, net	(22)		(25)		(69)		(82)
Interest expense to affiliates, net	(4)		(4)		(12)		(12)
Other, net	4		4		14		13
Total other income and (deductions)	(22)		(25)		(67)		(81)
Income before income taxes	80		89		259		267
Income taxes	31		36		103		107
Net income	49		53		156		160
Preferred security dividends and redemption	3		3		10		10
Net income attributable to common shareholders	46		50		146		150
Pension and non-pension postretirement benefit plans:
Comprehensive income	$ 49		$ 53		$ 156		$ 160

[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] Intersegment revenues exclude sales to unconsolidated affiliates. The intersegment profit associated with the 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.

[3] For the three months ended September 30, 2014 and 2013, utility taxes of $22 million and $21 million, respectively, are included in revenues and expenses for Generation. For the three months ended September 30, 2014 and 2013, utility taxes of $61 million and $65 million, respectively, are included in revenues and expenses for ComEd. For the three months ended September 30, 2014 and 2013, utility taxes of $34 million and $33 million, respectively, are included in revenues and expenses for PECO. For the three months ended September 30, 2014 and 2013, utility taxes of $21 million and $20 million, respectively, are included in revenues and expenses for BGE.

[4] For the nine months ended September 30, 2014 and 2013, utility taxes of $67 million and $60 million, respectively, are included in revenues and expenses for Generation. For the nine months ended September 30, 2014 and 2013, utility taxes of $180 million and $182 million, respectively, are included in revenues and expenses for ComEd. For the nine months ended September 30, 2014 and 2013, utility taxes of $99 million and $97 million, respectively, are included in revenues and expenses for PECO. For the nine months ended September 30, 2014 and 2013, utility taxes of $64 million and $62 million, respectively, are included in revenues and expenses for BGE.

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