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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Operating revenues [Abstract]        
Total operating revenues $ 6,502 [1] $ 6,579 [1] $ 18,725 [2] $ 17,235 [2]
Operating expenses        
Purchased power 2,743 3,026 8,143 7,398
Operating and maintenance 1,735 2,170 5,391 5,979
Depreciation and amortization 530 500 1,606 1,376
Taxes other than income 277 290 825 737
Total operating expenses 5,285 5,986 15,965 15,490
Gain (loss) on equity method investments 37 10 7 (69)
Operating income 1,254 603 2,767 1,676
Other income and deductions        
Interest expense (228) (240) (1,091) (678)
Interest expense to affiliates, net (6) (6) (19) (19)
Other, net 155 101 311 253
Total other income and deductions (79) (145) (799) (444)
Income before income taxes 1,175 458 1,968 1,232
Income taxes 439 161 733 445
Net income 736 297 1,235 787
Net income (loss) attributable to noncontrolling interests and preferred security dividends 2 (1) (11) (5)
Net income on common stock 738 296 1,224 782
Pension and non-pension postretirement benefit plans:        
Prior service benefit reclassified to periodic benefit cost (1)   0 (1)
Actuarial loss reclassified to periodic cost (49) (44) (151) (126)
Transition obligation reclassified to periodic cost       (2)
Pension and non-pension postretirement benefit plans valuation adjustment (8) (67) 69 (78)
Deferred Compensation Unit Valuation Adjustment 0   10  
Change in unrealized gain (loss) on cash-flow hedges (46) (88) (169) (29)
Change in unrealized income (loss) on equity investments 16 17 51 23
Change in unrealized income (loss) on foreign currency translation 0 2 (5) 0
Change in unrealized gain (loss) on marketable securities 0 0 (1) 0
Other comprehensive income (loss) 12 (92) 106 [3] 45
Comprehensive income 748 205 1,341 832
Average shares of common stock outstanding:        
Basic 857 854 856 804
Diluted 860 857 860 806
Earnings per average common share - basic        
Net income $ 0.86 $ 0.35 $ 1.43 $ 0.97
Earnings per average common share - diluted        
Net income $ 0.86 $ 0.35 $ 1.42 $ 0.97
Dividends per common share $ 0.31 $ 0.53 $ 1.15 $ 1.58
Exelon Generation Co L L C [Member]
        
Operating revenues [Abstract]        
Operating revenues 3,871 3,558 10,729 9,276
Operating revenues from affiliates 384 473 1,129 1,263
Total operating revenues 4,255 4,031 11,858 10,539
Operating expenses        
Purchased power and fuel 2,179 2,122 6,294 5,018
Operating and maintenance 936 1,289 2,943 3,319
Operating and maintenance from affiliate 140 140 434 467
Depreciation and amortization 218 207 643 564
Taxes other than income 98 109 292 272
Total operating expenses 3,571 3,867 10,606 9,640
Gain (loss) on equity method investments 37 10 7 (69)
Operating income 721 174 1,259 830
Other income and deductions        
Interest expense (82) (85) (257) (223)
Other, net 134 83 229 185
Total other income and deductions 52 (2) (28) (38)
Income before income taxes 773 172 1,231 792
Income taxes 288 85 436 373
Net income 485 87 795 419
Income (Loss) attributable to noncontrolling interest 5 4 6 6
Net income on membership interest 490 91 801 425
Pension and non-pension postretirement benefit plans:        
Change in unrealized gain (loss) on cash-flow hedges (49) (171) (316) (185)
Change in unrealized income (loss) on equity investments 16 17 52 23
Change in unrealized income (loss) on foreign currency translation 1 2 (5) 0
Change in unrealized gain (loss) on marketable securities   0 (1) (1)
Other comprehensive income (loss) (32) (152) (270) [3] (163)
Comprehensive income 453 (65) 525 256
Commonwealth Edison Co [Member]
        
Operating revenues [Abstract]        
Operating revenues 1,155 1,484 3,393 4,152
Operating revenues from affiliates 1 0 2 2
Total operating revenues 1,156 1,484 3,395 4,154
Operating expenses        
Purchased power 158 498 522 1,255
Purchased power from affiliate 143 180 409 631
Operating and maintenance 296 313 907 882
Operating and maintenance from affiliate 37 37 113 118
Depreciation and amortization 164 157 501 458
Taxes other than income 80 81 225 224
Total operating expenses 878 1,266 2,677 3,568
Operating income 278 218 718 586
Other income and deductions        
Interest expense (71) (71) (493) (221)
Interest expense to affiliates, net (3) (3) (10) (9)
Other, net 7 5 18 12
Total other income and deductions (67) (69) (485) (218)
Income before income taxes 211 149 233 368
Income taxes 85 59 93 149
Net income 126 90 140 219
Pension and non-pension postretirement benefit plans:        
Change in unrealized gain (loss) on marketable securities       1
Other comprehensive income (loss)       1
Comprehensive income 126 90 140 220
PECO Energy Co [Member]
        
Operating revenues [Abstract]        
Operating revenues 727 805 2,294 2,393
Operating revenues from affiliates 1 1 1 3
Total operating revenues 728 806 2,295 2,396
Operating expenses        
Purchased power 207 155 632 626
Purchased power from affiliate 82 171 321 407
Operating and maintenance 162 172 480 491
Operating and maintenance from affiliate 24 27 74 83
Depreciation and amortization 57 55 171 161
Taxes other than income 41 48 121 122
Total operating expenses 573 628 1,799 1,890
Operating income 155 178 496 506
Other income and deductions        
Interest expense (26) (29) (77) (85)
Interest expense to affiliates, net (3) (3) (9) (9)
Other, net 1 2 4 6
Total other income and deductions (28) (30) (82) (88)
Income before income taxes 127 148 414 418
Income taxes 35 25 122 118
Net income 92 123 292 300
Preferred security dividends 0 (1) (7) (3)
Net income on common stock 92 122 285 297
Pension and non-pension postretirement benefit plans:        
Change in unrealized gain (loss) on marketable securities       1
Other comprehensive income (loss)       1
Comprehensive income 92 123 292 301
Baltimore Gas and Electric Company [Member]
        
Operating revenues [Abstract]        
Operating revenues 735 716 2,261 2,023
Operating revenues from affiliates 2 4 10 9
Total operating revenues 737 720 2,271 2,032
Operating expenses        
Purchased power and fuel 202 253 703 747
Purchased power and fuel from affiliate 144 120 356 296
Operating and maintenance 125 172 391 460
Operating and maintenance from affiliate 21 29 59 97
Depreciation and amortization 78 68 252 218
Taxes other than income 53 48 162 143
Total operating expenses 623 690 1,923 1,961
Operating income 114 30 348 71
Other income and deductions        
Interest expense (29) (35) (94) (110)
Other, net 4 5 13 18
Total other income and deductions (25) (30) (81) (92)
Income before income taxes 89 0 267 (21)
Income taxes 36 0 107 (7)
Net income 53 0 160 (14)
Preferred security dividends (3) (4) (10) (10)
Net income on common stock 50 (4) 150 (24)
Pension and non-pension postretirement benefit plans:        
Comprehensive income $ 53 $ 0 $ 160 $ (14)
[1] For the three months ended September 30, 2013 and 2012, utility taxes of $21 million and $28 million, respectively, are included in revenues and expenses for Generation. For the three months ended September 30, 2013 and 2012, utility taxes of $65 million and $67 million, respectively, are included in revenues and expenses for ComEd. For the three months ended September 30, 2013 and 2012, utility taxes of $33 million and $40 million, respectively, are included in revenues and expenses for PECO. For the three months ended September 30, 2013 and 2012, utility taxes of $20 million and $20 million, respectively, are included in revenues and expenses for BGE.
[2] For the nine months ended September 30, 2013 and 2012, utility taxes of $60 million and $60 million, respectively, are included in revenues and expenses for Generation. For the nine months ended September 30, 2013 and 2012, utility taxes of $182 million and $182 million, respectively, are included in revenues and expenses for ComEd. For the nine months ended September 30, 2013 and 2012, utility taxes of $97 million and $108 million, respectively, are included in revenues and expenses for PECO. For the nine months ended September 30, 2013 and period of March 12, 2012 through September 30, 2012, utility taxes of $62 million and $42 million, respectively, are included in revenues and expenses for BGE.
[3] (a) All amounts are net of tax. Amounts in parenthesis represent a decrease in accumulated other comprehensive income.