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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating revenues        
Operating Revenue $ 4,971 $ 4,455 $ 14,387 $ 12,955
Regulated Operating Revenue 4,457 4,259 12,824 12,034
Electric operating revenues   0   0
Natural gas operating revenues   0   0
Revenues from alternative revenue programs (25) 54 (41) 191
Operating revenues from affiliates 0 [1] 0 [1] 0 [2] 0
Total operating revenues 9,403 8,768 27,170 25,180
Operating expenses        
Competitive businesses purchased power and fuel 2,977 2,316 8,542 7,268
Cost of Purchased Power 1,355 1,226 3,832 3,259
Operating and maintenance 2,346 2,275 7,036 7,658
Depreciation and amortization 1,105 1,002 3,284 2,814
Taxes other than income 469 456 1,342 1,313
Total operating expenses 8,252 7,275 24,036 22,312
Income (Loss) from Equity Method Investments     (22) (26)
Gain (Loss) on sales of assets and businesses (5) (1) 55 4
Bargain purchase gain 0 7 0 233
Operating income (loss) 1,146 1,499 3,189 3,105
Other income and (deductions)        
Interest expense, net (387) (377) (1,119) (1,165)
Interest expense to affiliates (6) (9) (19) (29)
Other, net 194 210 212 643
Total other income and (deductions) (199) (176) (926) (551)
Income (loss) before income taxes 947 1,323 2,263 2,554
Income taxes 137 451 262 601
Equity in earnings (losses) of unconsolidated affiliates (10) (7) (22) (25)
Net income (loss) 800 865 1,979 1,928
Net Income (Loss) Attributable to Noncontrolling Interest 67 42 121 21
Net income (loss) attributable to common shareholders 733 823 1,858 1,907
Other comprehensive income (loss), net of income taxes        
Prior service benefit reclassified to periodic benefit cost (17) (14) (50) (42)
Actuarial loss reclassified to periodic benefit cost 62 49 186 147
Pension and non-pension postretirement benefit plan valuation adjustment 5 3 22 (55)
Unrealized gain (loss) on cash flow hedges 0 0 12 5
Unrealized gain on investments in unconsolidated affiliates 0 1 3 5
Unrealized gain (loss) on foreign currency translation 2 4 (4) 7
Unrealized gain on marketable securities 0 1 0 2
Other comprehensive income 52 44 169 69
Comprehensive income (loss) 852 909 2,148 1,997
Comprehensive income attributable to noncontrolling interests $ 67 $ 42 $ 123 $ 19
Average shares of common stock outstanding:        
Weighted Average Number of Shares Outstanding, Basic 968 962 967 941
Weighted Average Number of Shares Outstanding, Diluted 970 965 969 943
Earnings per average common share:        
Earnings Per Share, Basic $ 0.76 $ 0.86 $ 1.92 $ 2.03
Earnings Per Share, Diluted 0.76 0.85 1.92 2.02
Dividends declared per common share $ 0.35 $ 0.33 $ 1.04 $ 0.98
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 785 $ 867 $ 2,025 $ 1,978
Exelon Generation Co L L C [Member]        
Operating revenues        
Operating Revenue 4,970 4,454 14,389 12,949
Regulated Operating Revenue   0   0
Electric operating revenues   0   0
Natural gas operating revenues   0   0
Revenues from alternative revenue programs   0   0
Operating revenues from affiliates 308 296 979 894
Total operating revenues 5,278 4,750 15,368 13,843
Operating expenses        
Competitive businesses purchased power and fuel 2,977 2,315 8,542 7,267
Purchased power from affiliate 3 16 10 19
Operating and maintenance 1,218 1,205 3,643 4,343
Operating and maintenance from affiliates 152 171 483 536
Depreciation and amortization 468 410 1,383 1,046
Taxes other than income 143 141 414 425
Total operating expenses 4,961 4,258 14,475 13,636
Income (Loss) from Equity Method Investments     (23) (26)
Gain (Loss) on sales of assets and businesses (6) (2) 48 3
Bargain purchase gain 0 7 0 233
Operating income (loss) 311 497 941 443
Other income and (deductions)        
Interest expense, net (93) (103) (278) (313)
Interest expense to affiliates (8) (10) (27) (29)
Other, net 179 209 164 648
Total other income and (deductions) 78 96 (141) 306
Income (loss) before income taxes 389 593 800 749
Income taxes 78 239 110 215
Equity in earnings (losses) of unconsolidated affiliates (11) (8) (23) (26)
Net income (loss) 300 346 667 508
Net Income (Loss) Attributable to Noncontrolling Interest 66 42 120 21
Net income (loss) attributable to membership interest 234 304 547 487
Other comprehensive income (loss), net of income taxes        
Unrealized gain (loss) on cash flow hedges 0 0 12 5
Unrealized gain on investments in unconsolidated affiliates 0 0 3 4
Unrealized gain (loss) on foreign currency translation 2 4 (4) 7
Other comprehensive income 2 4 11 16
Comprehensive income (loss) 302 350 678 524
Comprehensive income attributable to noncontrolling interests 66 42 122 19
Earnings per average common share:        
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 236 308 556 505
Commonwealth Edison Co [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 1,609 1,552 4,512 4,167
Natural gas operating revenues   0   0
Revenues from alternative revenue programs (15) 16 (27) 48
Operating revenues from affiliates 4 3 23 12
Total operating revenues 1,598 1,571 4,508 4,227
Operating expenses        
Purchased power 496 489 1,281 1,178
Purchased power from affiliate 123 40 421 63
Operating and maintenance 276 277 785 897
Operating and maintenance from affiliates 61 69 189 199
Depreciation and amortization 237 212 696 631
Taxes other than income 82 80 238 223
Total operating expenses 1,275 1,167 3,610 3,191
Income (Loss) from Equity Method Investments     0 0
Gain (Loss) on sales of assets and businesses 0 0 5 0
Operating income (loss) 323 404 903 1,036
Other income and (deductions)        
Interest expense, net (82) (86) (251) (265)
Interest expense to affiliates (3) (3) (10) (10)
Other, net 7 5 21 14
Total other income and (deductions) (78) (84) (240) (261)
Income (loss) before income taxes 245 320 663 775
Income taxes 52 131 140 328
Net income (loss) 193 189 523 447
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 193 189 523 447
PECO Energy Co [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 697 660 1,886 1,798
Natural gas operating revenues 57 53 382 338
Revenues from alternative revenue programs 1 0 2 0
Operating revenues from affiliates 2 2 5 5
Total operating revenues 757 715 2,275 2,141
Operating expenses        
Purchased power 215 190 576 483
Purchased fuel 14 14 148 126
Purchased power from affiliate 34 31 94 110
Operating and maintenance 184 161 572 488
Operating and maintenance from affiliates 35 36 114 107
Depreciation and amortization 75 72 224 213
Taxes other than income 46 42 125 116
Total operating expenses 603 546 1,853 1,643
Income (Loss) from Equity Method Investments     0 0
Gain (Loss) on sales of assets and businesses 0 0 1 0
Operating income (loss) 154 169 423 498
Other income and (deductions)        
Interest expense, net (28) (28) (85) (84)
Interest expense to affiliates (4) (3) (11) (9)
Other, net 2 2 4 6
Total other income and (deductions) (30) (29) (92) (87)
Income (loss) before income taxes 124 140 331 411
Income taxes (2) 28 (5) 84
Net income (loss) 126 112 336 327
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 126 112 336 327
Baltimore Gas and Electric Company [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 652 626 1,847 1,811
Natural gas operating revenues 79 73 527 438
Revenues from alternative revenue programs (6) 36 (23) 102
Operating revenues from affiliates 6 3 18 12
Total operating revenues 731 738 2,369 2,363
Operating expenses        
Purchased power 183 159 510 407
Purchased fuel 21 13 176 118
Purchased power from affiliate 68 97 195 328
Operating and maintenance 144 138 462 421
Operating and maintenance from affiliates 38 37 116 111
Depreciation and amortization 110 109 358 348
Taxes other than income 64 61 188 180
Total operating expenses 628 614 2,005 1,913
Income (Loss) from Equity Method Investments     0 0
Gain (Loss) on sales of assets and businesses 0 0 1 0
Operating income (loss) 103 124 365 450
Other income and (deductions)        
Interest expense, net (27) (24) (78) (69)
Interest expense to affiliates 0 (2) 0 (11)
Other, net 5 4 14 12
Total other income and (deductions) (22) (22) (64) (68)
Income (loss) before income taxes 81 102 301 382
Income taxes 18 40 59 151
Net income (loss) 63 62 242 231
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 63 62 242 231
Pepco Holdings LLC [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 1,340 1,278 3,541 3,376
Natural gas operating revenues 23 18 129 105
Revenues from alternative revenue programs (5) 2 7 41
Operating revenues from affiliates 3 12 11 35
Total operating revenues 1,361 1,310 3,688 3,557
Operating expenses        
Purchased power 415 354 1,077 901
Purchased fuel 12 7 65 46
Purchased power from affiliate 82 112 268 371
Operating and maintenance 261 214 751 666
Operating and maintenance from affiliates 31 37 106 108
Depreciation and amortization 192 179 555 511
Taxes other than income 123 122 343 344
Total operating expenses 1,116 1,025 3,165 2,947
Income (Loss) from Equity Method Investments     1 0
Gain (Loss) on sales of assets and businesses 0 0 0 1
Operating income (loss) 245 285 523 611
Other income and (deductions)        
Interest expense, net (65) (62) (193) (183)
Other, net 11 13 33 40
Total other income and (deductions) (54) (49) (160) (143)
Income (loss) before income taxes 191 236 363 468
Income taxes 4 83 28 109
Equity in earnings (losses) of unconsolidated affiliates 0 0 1 0
Net income (loss) 187 153 336 359
Earnings per average common share:        
Comprehensive Income (Loss), Net of Tax, Attributable to Parent 187 153 336 359
Potomac Electric Power Company [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 630 600 1,697 1,622
Natural gas operating revenues   0   0
Revenues from alternative revenue programs (4) 3 6 23
Operating revenues from affiliates 2 1 5 4
Total operating revenues 628 604 1,708 1,649
Operating expenses        
Purchased power 131 111 354 268
Purchased power from affiliate 46 57 143 210
Operating and maintenance 84 89 216 296
Operating and maintenance from affiliates 52 14 167 40
Depreciation and amortization 99 82 286 242
Taxes other than income 104 102 288 282
Total operating expenses 516 455 1,454 1,338
Income (Loss) from Equity Method Investments     0 0
Gain (Loss) on sales of assets and businesses 0 0 0 1
Operating income (loss) 112 149 254 312
Other income and (deductions)        
Interest expense, net (32) (31) (96) (89)
Other, net 7 7 23 22
Total other income and (deductions) (25) (24) (73) (67)
Income (loss) before income taxes 87 125 181 245
Income taxes (2) 38 7 57
Net income (loss) 89 87 174 188
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 89 87 174 188
Delmarva Power and Light Company [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 302 308 861 851
Natural gas operating revenues 24 18 129 105
Revenues from alternative revenue programs 0 (1) 5 9
Operating revenues from affiliates 2 2 6 6
Total operating revenues 328 327 1,001 971
Operating expenses        
Purchased power 96 75 258 215
Purchased fuel 11 7 64 46
Purchased power from affiliate 26 47 103 138
Operating and maintenance 44 71 137 204
Operating and maintenance from affiliates 38 8 119 23
Depreciation and amortization 47 45 135 124
Taxes other than income 15 15 43 43
Total operating expenses 277 268 859 793
Income (Loss) from Equity Method Investments     0 0
Operating income (loss) 51 59 142 178
Other income and (deductions)        
Interest expense, net (15) (13) (42) (38)
Other, net 2 4 7 10
Total other income and (deductions) (13) (9) (35) (28)
Income (loss) before income taxes 38 50 107 150
Income taxes 5 19 17 43
Net income (loss) 33 31 90 107
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 33 31 90 107
Atlantic City Electric Company [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 406 370 983 904
Natural gas operating revenues   0   0
Revenues from alternative revenue programs (1) 0 (4) 9
Operating revenues from affiliates 1 0 2 2
Total operating revenues 406 370 981 915
Operating expenses        
Purchased power 188 169 465 418
Purchased power from affiliate 10 7 21 24
Operating and maintenance 52 66 146 205
Operating and maintenance from affiliates 33 6 104 20
Depreciation and amortization 38 41 107 113
Taxes other than income 1 2 4 6
Total operating expenses 322 291 847 786
Income (Loss) from Equity Method Investments     0 0
Operating income (loss) 84 79 134 129
Other income and (deductions)        
Interest expense, net (16) (15) (48) (46)
Other, net 1 1 2 6
Total other income and (deductions) (15) (14) (46) (40)
Income (loss) before income taxes 69 65 88 89
Income taxes 8 24 12 12
Net income (loss) 61 41 76 77
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) $ 61 $ 41 $ 76 $ 77
[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 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.