Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Operating revenues [Abstract]
Operating revenues from affiliates	$ 0	$ 0
Revenues	6,024	6,141	13,261	[1]	12,223	[1]
Operating expenses
Purchased power and fuel	2,346	2,132	6,352		4,795
Purchased power from affiliate	66	287	400		605
Operating and maintenance	2,166	1,892	4,024		3,656
Depreciation and amortization	590	533	1,154		1,076
Taxes other than income	288	271	580		548
Total operating expenses	5,456	5,115	12,510		10,680
Gain on consolidation of CENG	261
Loss on equity method investments	0	(21)	(20)		(30)
Operating income	829	1,005	992		1,513
Other income and deductions
Interest expense	(228)	(246)	(445)		(863)
Interest expense to affiliates, net	(10)	(6)	(20)		(13)
Other, net	243	(17)	348		155
Total other income and deductions	5	(269)	(117)		(721)
Income before income taxes	834	736	875		792
Income taxes	277	239	224		294
Net income	557	497			498
Net income (loss) attributable to noncontrolling interests and preferred security dividends	(35)	(7)	(39)		(12)
Net income on common stock	522	490	612		486
Pension and non-pension postretirement benefit plans:
Prior service benefit reclassified to periodic benefit cost, net of tax	6	0	6		(1)
Actuarial loss reclassified to periodic cost, net of tax	(38)	(50)	(72)		(100)
Transition obligation reclassified to periodic cost, net of tax		0			0
Pension and non-pension postretirement benefit plans valuation adjustment	258	2	246		77
Deferred Compensation Unit Valuation Adjustment	0	10	0		10
Change in unrealized gain (loss) on cash-flow hedges	(48)	(65)	(73)		(123)
Change in unrealized income (loss) on equity investments	0	8	11		36
Change in unrealized income (loss) on foreign currency translation	4	(5)	(1)		(6)
Change in unrealized gain (loss) on marketable securities	1	0	1		(1)
Reversal of CENG Equity Method AOCI	(116)		(116)
Other comprehensive income (loss)	131	0			94
Comprehensive income	688	497	785		592
Average shares of common stock outstanding:
Basic	860	856	860		856
Diluted	864	860	863		859
Earnings per average common share - basic
Net income	$ 0.61	$ 0.57	$ 0.71		$ 0.57
Earnings per average common share - diluted
Net income	$ 0.60	$ 0.57	$ 0.71		$ 0.57
Dividends per common share	$ 0.31	$ 0.31	$ 0.62		$ 0.84
Exelon Generation Co L L C [Member]
Operating revenues [Abstract]
Operating revenues	3,588	3,718	7,644		6,859
Operating revenues from affiliates	201	352	535		744
Revenues	3,789	4,070	8,179		7,603
Operating expenses
Purchased power and fuel	1,766	1,656	4,774		3,503
Purchased power and fuel from affiliate	69	290	417		611
Operating and maintenance	1,255	1,041	2,194		2,007
Operating and maintenance from affiliate	158	148	305		295
Depreciation and amortization	254	210	466		424
Taxes other than income	118	101	223		194
Total operating expenses	3,620	3,446	8,379		7,034
Gain on consolidation of CENG	261		(268)
Loss on equity method investments	(1)	(21)	(20)		(30)
Operating income	429	603	41		539
Other income and deductions
Interest expense	(74)	(77)	(147)		(142)
Interest expense to affiliates, net	12	16	25		34
Other, net	228	(33)	318		95
Total other income and deductions	142	(126)	146		(81)
Income before income taxes	571	477	187		458
Income taxes	199	149	(1)		148
Net income	372	328	188		310
Income (Loss) attributable to noncontrolling interest	(32)	2	(33)		1
Net income on membership interest	340	330	155		311
Pension and non-pension postretirement benefit plans:
Change in unrealized gain (loss) on cash-flow hedges	(45)	(137)	(70)		(267)
Change in unrealized income (loss) on equity investments	0	8	11		36
Change in unrealized income (loss) on foreign currency translation	4	(5)	(1)		(6)
Change in unrealized gain (loss) on marketable securities	2		(1)		(1)
Reversal of CENG Equity Method AOCI	(116)		(116)
Other comprehensive income (loss)	(155)	(134)			(238)
Comprehensive income	217	194	11		72
Commonwealth Edison Co [Member]
Operating revenues [Abstract]
Operating revenues	1,128	1,080	2,261		2,238
Operating revenues from affiliates	0	0	1		1
Revenues	1,128	1,080	2,262		2,239
Operating expenses
Purchased power	204	127	416		364
Purchased power from affiliate	65	121	173		266
Operating and maintenance	316	319	603		611
Operating and maintenance from affiliate	39	40	78		76
Depreciation and amortization	174	170	347		337
Taxes other than income	72	71	149		145
Total operating expenses	870	848	1,766		1,799
Operating income	258	232	496		440
Other income and deductions
Interest expense	(76)	(72)	(153)		(422)
Interest expense to affiliates, net	(4)	(4)	(7)		(7)
Other, net	5	6	10		11
Total other income and deductions	(75)	(70)	(150)		(418)
Income before income taxes	183	162	346		22
Income taxes	72	66	137		8
Net income	111	96	209		14
Pension and non-pension postretirement benefit plans:
Comprehensive income	111	96	209		14
PECO Energy Co [Member]
Operating revenues [Abstract]
Operating revenues	656	672	1,648		1,567
Operating revenues from affiliates	0	0	1		0
Revenues	656	672	1,649		1,567
Operating expenses
Purchased power	193	161	570		426
Purchased power from affiliate	48	97	135		238
Operating and maintenance	160	155	416		319
Operating and maintenance from affiliate	24	26	48		50
Depreciation and amortization	59	56	117		113
Taxes other than income	38	39	80		80
Total operating expenses	522	534	1,366		1,226
Operating income	134	138	283		341
Other income and deductions
Interest expense	(25)	(25)	(50)		(51)
Interest expense to affiliates, net	(3)	(3)	(6)		(6)
Other, net	1	0	3		3
Total other income and deductions	(27)	(28)	(53)		(54)
Income before income taxes	107	110	230		287
Income taxes	23	32	57		87
Net income	84	78	173		200
Preferred security dividends	0	(6)	0		(7)
Net income on common stock	84	72	173		193
Pension and non-pension postretirement benefit plans:
Comprehensive income	84	78	173		200
Baltimore Gas and Electric Company [Member]
Operating revenues [Abstract]
Operating revenues	651	649	1,689		1,525
Operating revenues from affiliates	2	4	18		8
Revenues	653	653	1,707		1,533
Operating expenses
Purchased power and fuel	183	189	592		501
Purchased power and fuel from affiliate	85	99	205		212
Operating and maintenance	163	139	326		266
Operating and maintenance from affiliate	25	21	50		37
Depreciation and amortization	89	82	197		175
Taxes other than income	53	54	113		109
Total operating expenses	598	584	1,483		1,300
Operating income	55	69	224		233
Other income and deductions
Interest expense	(23)	(28)	(47)		(58)
Interest expense to affiliates, net	4	4	8		8
Other, net	5	4	9		9
Total other income and deductions	(22)	(28)	(46)		(57)
Income before income taxes	33	41	178		176
Income taxes	14	16	72		70
Net income	19	25	106		106
Preferred security dividends	(3)	(3)	(6)		(6)
Net income on common stock	16	22	100		100
Pension and non-pension postretirement benefit plans:
Comprehensive income	$ 19	$ 25	$ 106		$ 106

[1] For the six months ended June 30, 2014 and 2013, utility taxes of $45 million and $39 million, respectively, are included in revenues and expenses for Generation. For the six months ended June 30, 2014 and 2013, utility taxes of $119 million and $117 million, respectively, are included in revenues and expenses for ComEd. For the six months ended June 30, 2014 and 2013, utility taxes of $65 million and $64 million, respectively, are included in revenues and expenses for PECO. For the six months ended June 30, 2014 and 2013, utility taxes of $43 million and $41 million, respectively, are included in revenues and expenses for BGE.