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Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Operating revenues [Abstract]        
Operating revenues from affiliates $ 2 [1] $ 0 [1] $ 3 $ 0
Total Revenues 7,401 [2] 6,912 [2] 22,746 [3] 20,173 [3]
Operating expenses        
Purchased power and fuel 3,291 2,591 10,210 8,943
Purchased power and fuel from affiliates 0 57 0 456
Operating and maintenance 1,996 1,982 6,119 6,005
Depreciation and amortization 606 577 1,818 1,732
Taxes other than income 310 306 908 887
Total operating expenses 6,203 5,513 19,055 18,023
Equity in losses of unconsolidated affiliates   0 (3) (20)
Gain (Loss) on Sale of Assets and Asset Impairment Charges 2 339 10 356
Gain on consolidation and acquisition of businesses 0 0   261
Operating income 1,200 1,738 3,701 2,747
Other income and (deductions)        
Interest expense, net (243) (247) (724) (691)
Interest expense to affiliates (10) (11) (31) (31)
Other, net (244) 16 (179) 346
Total other income and (deductions) (497) (242) (934) (376)
Income before income taxes 703 1,496 2,767 2,371
Income taxes 115 422 805 646
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions (1)   (3)  
Net income 587 1,074 1,959 1,725
Net income (loss) attributable to noncontrolling interest and preference stock dividends (42) 81 0 121
Net income attributable to common shareholders 629 993 1,959 1,604
Pension and non-pension postretirement benefit plans:        
Prior service benefit reclassified to periodic benefit cost (11) (11) (35) (18)
Actuarial loss reclassified to periodic cost 55 38 165 109
Pension and non-pension postretirement benefit plans valuation adjustment 0 (8) (29) 240
Unrealized gain (loss) on cash flow hedges (3) (19) 4 (92)
Unrealized gain (loss) on equity investments 0 (3) 0 8
Unrealized gain (loss) on foreign currency translation (8) (5) (17) (6)
Unrealized loss on marketable securities (1) (3) 0 (2)
Reversal of CENG equity method AOCI 0 0 0 (116)
Other comprehensive income (loss) 32 (11) 88 [4] 123 [4]
Comprehensive income $ 619 $ 1,063 $ 2,047 $ 1,848
Average shares of common stock outstanding:        
Average common shares outstanding — basic 913 861 879 860
Average common shares outstanding — diluted 915 863 883 863
Earnings per average common share:        
Earnings per share - basic (in usd per share) $ 0.69 $ 1.15 $ 2.23 $ 1.87
Earnings per average common share - diluted        
Earnings per share - diluted (in usd per share) 0.69 1.15 2.22 1.86
Dividends per common share (in usd per share) $ 0.31 $ 0.31 $ 0.93 $ 0.93
Exelon Generation Co L L C [Member]        
Operating revenues [Abstract]        
Operating revenues $ 4,562 $ 4,300 $ 14,270 $ 11,944
Operating revenues from affiliates 206 112 571 647
Total Revenues 4,768 4,412 14,841 12,591
Operating expenses        
Purchased power and fuel from affiliates 3 59 11 476
Purchased power and fuel 2,516 1,821 7,789 6,595
Operating and maintenance 1,088 1,114 3,399 3,308
Operating and maintenance from affiliates 153 152 461 457
Depreciation and amortization 264 253 774 719
Taxes other than income 123 127 369 350
Total operating expenses 4,147 3,526 12,803 11,905
Equity in losses of unconsolidated affiliates   1 (4) (20)
Gain (Loss) on Sale of Assets and Asset Impairment Charges 1 338 7 355
Gain on consolidation and acquisition of businesses 0 0 0 261
Operating income 622 1,225 2,045 1,282
Other income and (deductions)        
Interest expense, net (56) (77) (236) (224)
Interest expense to affiliates (12) (12) (33) (37)
Other, net (257) 4 (193) 306
Total other income and (deductions) (325) (85) (462) 45
Income before income taxes 297 1,140 1,583 1,327
Income taxes (36) 291 371 290
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions (1)   (4)  
Net income 332 849 1,208 1,037
Net income (loss) attributable to noncontrolling interests (45) 78 (10) 111
Net income attributable to membership interest 377 771 1,218 926
Pension and non-pension postretirement benefit plans:        
Unrealized gain (loss) on cash flow hedges (3) (16) (7) (86)
Unrealized gain (loss) on equity investments 0 (3) 0 8
Unrealized gain (loss) on foreign currency translation (8) (5) (17) (6)
Unrealized loss on marketable securities (2) (2) 0 (3)
Reversal of CENG equity method AOCI 0 0 0 (116)
Other comprehensive income (loss) (13) (26) (24) [4] (203) [4]
Comprehensive income 319 823 1,184 834
Commonwealth Edison Co [Member]        
Operating revenues [Abstract]        
Operating revenues 1,375 1,221 3,706 3,482
Operating revenues from affiliates 1 1 3 2
Total Revenues 1,376 1,222 3,709 3,484
Operating expenses        
Purchased power and fuel 388 325 974 741
Purchased power and fuel from affiliates 2 1 17 174
Operating and maintenance 353 320 1,023 923
Operating and maintenance from affiliates 51 39 143 117
Depreciation and amortization 176 174 528 521
Taxes other than income 79 76 225 225
Total operating expenses 1,049 935 2,910 2,701
Operating income 327 287 799 783
Other income and (deductions)        
Interest expense, net (80) (78) (238) (231)
Interest expense to affiliates (3) (3) (10) (10)
Other, net 4 4 14 14
Total other income and (deductions) (79) (77) (234) (227)
Income before income taxes 248 210 565 556
Income taxes 99 84 226 221
Net income 149 126 339 335
Pension and non-pension postretirement benefit plans:        
Comprehensive income 149 126 339 335
PECO Energy Co [Member]        
Operating revenues [Abstract]        
Operating revenues 739 693 2,385 2,342
Operating revenues from affiliates 1 0 1 1
Total Revenues 740 693 2,386 2,343
Operating expenses        
Purchased power and fuel 217 228 782 798
Purchased power and fuel from affiliates 61 27 171 162
Operating and maintenance 166 181 529 597
Operating and maintenance from affiliates 30 23 80 71
Depreciation and amortization 68 59 198 176
Taxes other than income 44 42 125 122
Total operating expenses 586 560 1,885 1,926
Equity in losses of unconsolidated affiliates     0 0
Gain (Loss) on Sale of Assets and Asset Impairment Charges       0
Gain (Loss) on Disposition of Assets 0 0 1  
Operating income 154 133 502 417
Other income and (deductions)        
Interest expense, net (25) (26) (75) (76)
Interest expense to affiliates (3) (3) (9) (9)
Other, net 1 2 3 5
Total other income and (deductions) (27) (27) (81) (80)
Income before income taxes 127 106 421 337
Income taxes 37 25 122 82
Net income     299 255
Net income attributable to common shareholders 90 81 299 255
Pension and non-pension postretirement benefit plans:        
Comprehensive income 90 81 299 255
Baltimore Gas and Electric Company [Member]        
Operating revenues [Abstract]        
Operating revenues 722 694 2,378 2,383
Operating revenues from affiliates 3 3 10 21
Total Revenues 725 697 2,388 2,404
Operating expenses        
Purchased power and fuel 170 216 664 808
Purchased power and fuel from affiliates 141 81 373 286
Operating and maintenance 138 142 412 468
Operating and maintenance from affiliates 31 23 87 73
Depreciation and amortization 79 78 271 275
Taxes other than income 57 55 169 168
Total operating expenses 616 595 1,976 2,078
Equity in losses of unconsolidated affiliates       0
Gain (Loss) on Disposition of Assets 1   1  
Operating income 110 102 413 326
Other income and (deductions)        
Interest expense, net (21) (22) (62) (69)
Interest expense to affiliates (4) (4) (11) (12)
Other, net 4 4 13 14
Total other income and (deductions) (21) (22) (60) (67)
Income before income taxes 89 80 353 259
Income taxes 35 31 141 103
Net income 54 49 212 156
Preferred security dividends and redemption 3 3 10 10
Net income attributable to common shareholders 51 46 202 146
Pension and non-pension postretirement benefit plans:        
Comprehensive income $ 54 $ 49 $ 212 $ 156
[1] (d)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] (c)For the three months ended September 30, 2015 and 2014, utility taxes of $28 million and $22 million, respectively, are included in revenues and expenses for Generation. For the three months ended September 30, 2015 and 2014, utility taxes of $63 million and $61 million, respectively, are included in revenues and expenses for ComEd. For the three months ended September 30, 2015 and 2014, utility taxes of $37 million and $34 million, respectively, are included in revenues and expenses for PECO. For the three months ended September 30, 2015 and 2014, utility taxes of $23 million and $21 million, respectively, are included in revenues and expenses for BGE.
[3] (d)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.
[4] All amounts are net of tax. Amounts in parentheses represent a decrease in accumulated other comprehensive income.