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Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating revenues        
Operating Revenue $ 4,305 $ 3,950 $ 9,417 $ 8,500
Regulated Operating Revenue 3,797 3,657 8,368 7,776
Electric operating revenues   0   0
Natural gas operating revenues   0   0
Revenues from alternative revenue programs (26) 58 (16) 137
Operating revenues from affiliates 0 [1] 0 [1] 0 [2] 0 [2]
Total operating revenues 8,076 7,665 17,769 16,413
Operating expenses        
Competitive businesses purchased power and fuel 2,277 2,158 5,566 4,952
Rate-regulated utility purchased power and fuel 1,038 928 2,476 2,033
Operating and maintenance 2,307 2,945 4,691 5,383
Depreciation and amortization 1,088 915 2,179 1,811
Taxes other than income 428 420 874 857
Total operating expenses 7,138 7,366 15,786 15,036
Gain (Loss) on sales of assets and businesses 4 1 60 5
Bargain purchase gain 0 0 0 226
Operating income (loss) 942 300 2,043 1,608
Other income and (deductions)        
Interest expense, net (367) (426) (732) (789)
Interest expense to affiliates (6) (10) (13) (20)
Other, net 44 177 17 434
Total other income and (deductions) (329) (259) (728) (375)
Income (loss) before income taxes 613 41 1,315 1,233
Income taxes 66 (62) 125 149
Equity in losses of unconsolidated affiliates (5) (9) (11) (18)
Net income (loss) 542 94 1,179 1,066
Net Income (Loss) Attributable to Noncontrolling Interest 3 (1) 54 (20)
Net income (loss) attributable to common shareholders 539 95 1,125 1,086
Other comprehensive income (loss), net of income taxes        
Prior service benefit reclassified to periodic benefit cost (17) (14) (33) (28)
Actuarial loss reclassified to periodic benefit cost 61 49 123 98
Pension and non-pension postretirement benefit plan valuation adjustment (1) (2) 18 (58)
Unrealized gain (loss) on cash flow hedges 4 (1) 12 5
Unrealized gain on investments in unconsolidated affiliates 2 0 3 3
Unrealized gain (loss) on foreign currency translation (5) 2 (6) 3
Unrealized gain on marketable securities 0 1 0 2
Other comprehensive income (loss) 44 35 117 25
Comprehensive income (loss) 586 129 1,296 1,091
Comprehensive income (loss) attributable to noncontrolling interests 4 (1) 56 (22)
Comprehensive income (loss) attributable to common shareholders $ 582 $ 130 $ 1,240 $ 1,113
Average shares of common stock outstanding:        
Weighted Average Number of Shares Outstanding, Basic 967 934 967 931
Weighted Average Number of Shares Outstanding, Diluted 969 936 968 932
Earnings per average common share:        
Earnings Per Share, Basic $ 0.56 $ 0.10 $ 1.16 $ 1.17
Earnings Per Share, Diluted 0.56 0.10 1.16 1.17
Dividends declared per common share $ 0.35 $ 0.33 $ 0.69 $ 0.66
Exelon Generation Co L L C [Member]        
Operating revenues        
Operating Revenue $ 4,306 $ 3,948 $ 9,419 $ 8,495
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 273 268 671 598
Total operating revenues 4,579 4,216 10,090 9,093
Operating expenses        
Rate-regulated utility purchased power and fuel 2,277 2,156 5,566 4,952
Purchased power from affiliate 3 1 7 3
Operating and maintenance 1,247 1,826 2,425 3,138
Operating and maintenance from affiliates 171 186 331 365
Depreciation and amortization 466 334 914 637
Taxes other than income 134 140 272 282
Total operating expenses 4,298 4,643 9,515 9,377
Gain (Loss) on sales of assets and businesses 1 0 54 4
Bargain purchase gain 0 0 0 226
Operating income (loss) 282 (427) 629 (54)
Other income and (deductions)        
Interest expense, net (93) (120) (184) (209)
Interest expense to affiliates (9) (9) (18) (19)
Other, net 29 181 (15) 440
Total other income and (deductions) (73) 52 (217) 212
Income (loss) before income taxes 209 (375) 412 158
Income taxes 23 (148) 32 (25)
Equity in losses of unconsolidated affiliates (5) (9) (12) (19)
Net income (loss) 181 (236) 368 164
Net Income (Loss) Attributable to Noncontrolling Interest 3 (1) 54 (20)
Net income (loss) attributable to membership interest 178 (235) 314 184
Other comprehensive income (loss), net of income taxes        
Unrealized gain (loss) on cash flow hedges 5 (1) 12 5
Unrealized gain on investments in unconsolidated affiliates 2 0 3 4
Unrealized gain (loss) on foreign currency translation (5) 2 (6) 3
Other comprehensive income (loss) 2 1 9 12
Comprehensive income (loss) 183 (235) 377 176
Comprehensive income (loss) attributable to noncontrolling interests 4 (1) 56 (22)
Comprehensive income (loss) attributable to common shareholders 179 (234) 321 198
Commonwealth Edison Co [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 1,410 1,336 2,903 2,615
Natural gas operating revenues   0   0
Revenues from alternative revenue programs (17) 18 (12) 32
Operating revenues from affiliates 5 3 19 9
Total operating revenues 1,398 1,357 2,910 2,656
Operating expenses        
Purchased power 373 360 784 689
Purchased power from affiliate 104 18 298 24
Operating and maintenance 255 312 509 620
Operating and maintenance from affiliates 69 65 129 127
Depreciation and amortization 231 211 459 419
Taxes other than income 79 72 156 144
Total operating expenses 1,111 1,038 2,335 2,023
Gain (Loss) on sales of assets and businesses 1 0 5 0
Operating income (loss) 288 319 580 633
Other income and (deductions)        
Interest expense, net (82) (98) (168) (179)
Interest expense to affiliates (3) (3) (7) (6)
Other, net 4 4 12 8
Total other income and (deductions) (81) (97) (163) (177)
Income (loss) before income taxes 207 222 417 456
Income taxes 43 104 88 197
Net income (loss) 164 118 329 259
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 164 118 329 259
PECO Energy Co [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 556 548 1,189 1,138
Natural gas operating revenues 93 80 325 285
Revenues from alternative revenue programs 2 0 1 0
Operating revenues from affiliates 2 2 3 3
Total operating revenues 653 630 1,518 1,426
Operating expenses        
Purchased power 161 136 361 292
Purchased fuel 37 27 134 113
Purchased power from affiliate 24 34 60 79
Operating and maintenance 153 153 387 326
Operating and maintenance from affiliates 38 37 79 72
Depreciation and amortization 74 71 149 141
Taxes other than income 39 35 79 74
Total operating expenses 526 493 1,249 1,097
Operating income (loss) 127 137 269 329
Other income and (deductions)        
Interest expense, net (28) (28) (57) (56)
Interest expense to affiliates (4) (3) (7) (6)
Other, net 0 2 2 3
Total other income and (deductions) (32) (29) (62) (59)
Income (loss) before income taxes 95 108 207 270
Income taxes (1) 20 (3) 55
Net income (loss) 96 88 210 215
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 96 88 210 215
Baltimore Gas and Electric Company [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 542 545 1,196 1,186
Natural gas operating revenues 118 94 448 365
Revenues from alternative revenue programs (4) 32 (17) 66
Operating revenues from affiliates 6 3 12 8
Total operating revenues 662 674 1,639 1,625
Operating expenses        
Purchased power 135 115 327 248
Purchased fuel 32 22 155 105
Purchased power from affiliate 62 97 127 231
Operating and maintenance 135 135 318 284
Operating and maintenance from affiliates 41 39 79 73
Depreciation and amortization 114 112 248 239
Taxes other than income 59 56 124 119
Total operating expenses 578 576 1,378 1,299
Gain (Loss) on sales of assets and businesses 1 0 1 0
Operating income (loss) 85 98 262 326
Other income and (deductions)        
Interest expense, net (25) (22) (51) (46)
Interest expense to affiliates 0 (4) 0 (8)
Other, net 4 4 9 8
Total other income and (deductions) (21) (22) (42) (46)
Income (loss) before income taxes 64 76 220 280
Income taxes 13 31 41 111
Net income (loss) 51 45 179 169
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 51 45 179 169
Pepco Holdings LLC [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 1,052 1,032 2,202 2,100
Natural gas operating revenues 28 22 106 87
Revenues from alternative revenue programs (7) 8 12 38
Operating revenues from affiliates 3 12 7 23
Total operating revenues 1,076 1,074 2,327 2,248
Operating expenses        
Purchased power 288 259 662 547
Purchased fuel 12 9 53 39
Purchased power from affiliate 81 115 186 259
Operating and maintenance 218 231 489 454
Operating and maintenance from affiliates 37 38 74 70
Depreciation and amortization 180 165 363 332
Taxes other than income 107 110 221 221
Total operating expenses 923 927 2,048 1,922
Gain (Loss) on sales of assets and businesses 0 1 0 1
Operating income (loss) 153 148 279 327
Other income and (deductions)        
Interest expense, net (65) (59) (128) (122)
Other, net 11 13 22 26
Total other income and (deductions) (54) (46) (106) (96)
Income (loss) before income taxes 99 102 173 231
Income taxes 15 36 24 26
Net income (loss) 84 66 149 205
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) attributable to common shareholders 84 66 149 205
Potomac Electric Power Company [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 531 508 1,067 1,022
Natural gas operating revenues   0   0
Revenues from alternative revenue programs (10) 5 10 20
Operating revenues from affiliates 2 1 3 3
Total operating revenues 523 514 1,080 1,045
Operating expenses        
Purchased power 94 74 224 157
Purchased power from affiliate 46 69 98 152
Operating and maintenance 60 106 133 208
Operating and maintenance from affiliates 56 14 113 26
Depreciation and amortization 92 78 188 160
Taxes other than income 90 90 183 180
Total operating expenses 438 431 939 883
Gain (Loss) on sales of assets and businesses 0 1 0 1
Operating income (loss) 85 84 141 163
Other income and (deductions)        
Interest expense, net (32) (28) (63) (58)
Other, net 8 7 16 15
Total other income and (deductions) (24) (21) (47) (43)
Income (loss) before income taxes 61 63 94 120
Income taxes 7 20 9 19
Net income (loss) 54 43 85 101
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) 54 43 85 101
Delmarva Power and Light Company [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 255 258 558 544
Natural gas operating revenues 28 22 106 87
Revenues from alternative revenue programs 4 0 5 9
Operating revenues from affiliates 2 2 4 4
Total operating revenues 289 282 673 644
Operating expenses        
Purchased power 72 64 162 141
Purchased fuel 12 9 53 38
Purchased power from affiliate 30 40 76 91
Operating and maintenance 36 66 94 133
Operating and maintenance from affiliates 41 8 81 15
Depreciation and amortization 43 40 88 79
Taxes other than income 13 14 28 28
Total operating expenses 247 241 582 525
Operating income (loss) 42 41 91 119
Other income and (deductions)        
Interest expense, net (14) (13) (27) (25)
Other, net 3 3 5 6
Total other income and (deductions) (11) (10) (22) (19)
Income (loss) before income taxes 31 31 69 100
Income taxes 5 12 12 24
Net income (loss) 26 19 57 76
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) attributable to common shareholders 26 19 57 76
Atlantic City Electric Company [Member]        
Operating revenues        
Operating Revenue   0   0
Regulated Operating Revenue   0   0
Electric operating revenues 265 266 576 534
Natural gas operating revenues   0   0
Revenues from alternative revenue programs (1) 3 (3) 9
Operating revenues from affiliates 1 1 2 1
Total operating revenues 265 270 575 544
Operating expenses        
Purchased power 122 121 277 250
Purchased power from affiliate 6 7 12 16
Operating and maintenance 40 71 95 139
Operating and maintenance from affiliates 35 7 70 13
Depreciation and amortization 36 37 69 72
Taxes other than income 1 2 3 4
Total operating expenses 240 245 526 494
Operating income (loss) 25 25 49 50
Other income and (deductions)        
Interest expense, net (16) (15) (32) (30)
Other, net 1 2 1 4
Total other income and (deductions) (15) (13) (31) (26)
Income (loss) before income taxes 10 12 18 24
Income taxes 2 4 3 (12)
Net income (loss) 8 8 15 36
Other comprehensive income (loss), net of income taxes        
Comprehensive income (loss) $ 8 $ 8 $ 15 $ 36
[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.