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Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating revenues [Abstract]    
Revenues $ 7,237 [1] $ 6,082 [1]
Operating expenses    
Purchased power and fuel 4,006 2,663
Purchased power from affiliate 334 318
Operating and maintenance 1,858 1,764
Depreciation and amortization 564 543
Taxes other than income 293 277
Total operating expenses 7,055 5,565
Loss on equity method investments (19) (9)
Operating income 163 508
Other income and deductions    
Interest expense (217) (617)
Interest expense to affiliates, net (10) (6)
Other, net 103 172
Total other income and deductions (124) (451)
Income before income taxes 39 57
Income taxes (54) 56
Net income 93 1
Net income (loss) attributable to noncontrolling interests and preferred security dividends (3) (5)
Net income on common stock 90 (4)
Pension and non-pension postretirement benefit plans:    
Prior service benefit reclassified to periodic benefit cost, net of tax (1) 0
Actuarial loss reclassified to periodic cost, net of tax (34) (51)
Transition obligation reclassified to periodic cost, net of tax 0 0
Pension and non-pension postretirement benefit plans valuation adjustment (13) 75
Change in unrealized gain (loss) on cash-flow hedges (25) (58)
Change in unrealized income (loss) on equity investments 12 28
Change in unrealized income (loss) on foreign currency translation (5) (1)
Change in unrealized gain (loss) on marketable securities 0 (1)
Other comprehensive income (loss) 4 [2] 94 [2]
Comprehensive income 97 95
Average shares of common stock outstanding:    
Basic 858 855
Diluted 861 855
Earnings per average common share - basic    
Net income $ 0.10 $ (0.01)
Earnings per average common share - diluted    
Net income $ 0.10 $ (0.01)
Dividends per common share $ 0.31 $ 0.53
Exelon Generation Co L L C [Member]
    
Operating revenues [Abstract]    
Operating revenues 4,056 3,141
Operating revenues from affiliates 334 392
Revenues 4,390 3,533
Operating expenses    
Purchased power and fuel from affiliate 349 321
Purchased power 3,008 1,848
Operating and maintenance 938 965
Operating and maintenance from affiliate 149 147
Depreciation and amortization 211 214
Taxes other than income 105 93
Total operating expenses 4,760 3,588
Loss on equity method investments (19) (9)
Operating income (389) (64)
Other income and deductions    
Interest expense (73) (65)
Interest expense to affiliates, net (12) (17)
Other, net 90 128
Total other income and deductions 5 46
Income before income taxes (384) (18)
Income taxes (199) (1)
Net income (185) (17)
Income (Loss) attributable to noncontrolling interest 0 (1)
Net income on membership interest (185) (18)
Pension and non-pension postretirement benefit plans:    
Change in unrealized gain (loss) on cash-flow hedges (25) (130)
Change in unrealized income (loss) on equity investments 12 28
Change in unrealized income (loss) on foreign currency translation (5) (1)
Change in unrealized gain (loss) on marketable securities (3) (1)
Other comprehensive income (loss) (21) [2] (104) [2]
Comprehensive income (206) (121)
Commonwealth Edison Co [Member]
    
Operating revenues [Abstract]    
Operating revenues 1,133 1,159
Operating revenues from affiliates 1 1
Revenues 1,134 1,160
Operating expenses    
Purchased power 212 237
Purchased power from affiliate 108 145
Operating and maintenance 287 292
Operating and maintenance from affiliate 39 36
Depreciation and amortization 173 167
Taxes other than income 77 74
Total operating expenses 896 951
Operating income 238 209
Other income and deductions    
Interest expense (77) (350)
Interest expense to affiliates, net (3) (3)
Other, net 5 5
Total other income and deductions (75) (348)
Income before income taxes 163 (139)
Income taxes 65 (58)
Net income 98 (81)
Pension and non-pension postretirement benefit plans:    
Comprehensive income 98 (81)
PECO Energy Co [Member]
    
Operating revenues [Abstract]    
Operating revenues 992 895
Operating revenues from affiliates 1 0
Revenues 993 895
Operating expenses    
Purchased power and fuel 377 265
Purchased power from affiliate 87 141
Operating and maintenance 256 164
Operating and maintenance from affiliate 24 24
Depreciation and amortization 58 57
Taxes other than income 42 41
Total operating expenses 844 692
Operating income 149 203
Other income and deductions    
Interest expense (25) (26)
Interest expense to affiliates, net (3) (3)
Other, net 2 3
Total other income and deductions (26) (26)
Income before income taxes 123 177
Income taxes 34 55
Net income 89 122
Preferred security dividends 0 (1)
Net income on common stock 89 121
Pension and non-pension postretirement benefit plans:    
Comprehensive income 89 122
Baltimore Gas and Electric Company [Member]
    
Operating revenues [Abstract]    
Operating revenues 1,038 876
Operating revenues from affiliates 16 4
Revenues 1,054 880
Operating expenses    
Purchased power and fuel 409 313
Purchased power from affiliate 120 113
Operating and maintenance 163 124
Operating and maintenance from affiliate 25 19
Depreciation and amortization 108 93
Taxes other than income 60 55
Total operating expenses 885 717
Operating income 169 163
Other income and deductions    
Interest expense (23) (29)
Interest expense to affiliates, net (4) (4)
Other, net 4 5
Total other income and deductions (23) (28)
Income before income taxes 146 135
Income taxes 58 55
Net income 88 80
Preferred security dividends (3) (3)
Net income on common stock 85 77
Pension and non-pension postretirement benefit plans:    
Comprehensive income $ 88 $ 80
[1] For the ##D<curmonth> months ended ##D<cyperiod> and ##D<pyfiscal>, utility taxes of $##D<gcytdutiltax> million and $##D<gpytdutiltax> million, respectively, are included in revenues and expenses for Generation. For the ##D<curmonth> months ended ##D<cyperiod> and ##D<pyfiscal>, utility taxes of $##D<ccytdutiltax> million and $##D<cpytdutiltax> million, respectively, are included in revenues and expenses for ComEd. For the ##D<curmonth> months ended ##D<cyperiod> and ##D<pyfiscal>, utility taxes of $##D<pcytdutiltax> million and $##D<ppytdutiltax> million, respectively, are included in revenues and expenses for PECO. For the ##D<curmonth> months ended ##D<cyperiod> and period of March 12, 2012 through ##D<pyperiod>, utility taxes of $##D<bcytdutiltax> million and $##D<bpytdutiltax> million, respectively, are included in revenues and expenses for BGE.
[2] (a) All amounts are net of tax. Amounts in parenthesis represent a decrease in accumulated other comprehensive income.