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Segment Information Segment Information - Electric and Gas Revenue by Customer Class (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 23, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues |  | $ 8,814 | $ 9,403 | $ 8,076 | $ 9,693 | $ 8,384 | $ 8,768 | $ 7,665 | $ 8,747 |  |  | $ 35,985 | 33,565 | 31,366
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (62) | 207 | 48
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [1] |  |  |  |  |  |  |  |  |  |  | 15,344 | 14,840 | 13,869
Natural gas operating revenues | [1] |  |  |  |  |  |  |  |  |  |  | 1,470 | 1,333 | 1,166
Revenues | [1] |  |  |  |  |  |  |  |  |  |  | 35,985 | 33,567 | 31,365
Operating Segments [Member] | Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [1],[2],[3] |  |  |  |  |  |  |  |  |  |  | 4,609 | 4,469 |
Natural gas operating revenues | [1],[2],[3] |  |  |  |  |  |  |  |  |  |  | 181 | 161 |
Revenues | [1],[2],[3] |  |  |  |  |  |  |  |  |  |  | 4,805 | 4,679 |
Commonwealth Edison Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 27 | 15 | 15
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 5,884 | 5,478 | 5,263
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues |  | 1,373 | 1,598 | 1,398 | 1,512 | 1,309 | 1,571 | 1,357 | 1,298 |  |  | 5,882 | 5,536 | 5,254
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (29) | 43 | (24)
Commonwealth Edison Co [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (29) | 43 | (24)
Commonwealth Edison Co [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [5] |  |  |  |  |  |  |  |  |  |  | 5,881 | 5,463 | 5,248
Commonwealth Edison Co [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 2,942 | 2,715 | 2,603
Commonwealth Edison Co [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 1,487 | 1,363 | 1,318
Commonwealth Edison Co [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 538 | 455 | 462
Commonwealth Edison Co [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 47 | 44 | 45
Commonwealth Edison Co [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  |  |  | 867 | 886 | 820
Commonwealth Edison Co [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 30 | 30 | 30
Commonwealth Edison Co [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Commonwealth Edison Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Commonwealth Edison Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Commonwealth Edison Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Commonwealth Edison Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Commonwealth Edison Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Commonwealth Edison Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Commonwealth Edison Co [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 5,881 | 5,463 | 5,248
Commonwealth Edison Co [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 1 | 73 | 6
PECO Energy Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 8 | 7 | 8
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 2,469 | 2,369 | 2,524
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 568 | 494 | 462
Revenues |  | 765 | 757 | 653 | 866 | 729 | 715 | 630 | 796 |  |  | 3,038 | 2,870 | 2,994
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (7) | 0 | 0
PECO Energy Co [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (7) | 0 | 0
PECO Energy Co [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [5] |  |  |  |  |  |  |  |  |  |  | 2,464 | 2,363 | 2,519
PECO Energy Co [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 1,566 | 1,505 | 1,631
PECO Energy Co [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 404 | 401 | 430
PECO Energy Co [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 223 | 223 | 234
PECO Energy Co [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 28 | 30 | 32
PECO Energy Co [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  |  |  | 243 | 204 | 192
PECO Energy Co [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 12 | 12 | 12
PECO Energy Co [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  |  |  | 568 | 494 | 463
PECO Energy Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 395 | 331 | 309
PECO Energy Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 143 | 131 | 121
PECO Energy Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 0
PECO Energy Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  |  |  | 6 | 8 | 9
PECO Energy Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 23 | 23 | 24
PECO Energy Co [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 0
PECO Energy Co [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 3,032 | 2,857 | 2,982
PECO Energy Co [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 6 | 13 | 12
Baltimore Gas and Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 29 | 16 | 21
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 2,428 | 2,384 | 2,531
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 738 | 652 | 628
Revenues |  | 799 | 731 | 662 | 977 | 813 | 738 | 674 | 951 |  |  | 3,169 | 3,176 | 3,233
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (26) | 124 | 53
Baltimore Gas and Electric Company [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (26) | 124 | 53
Baltimore Gas and Electric Company [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 8 | 5 | 7
Electric operating revenues | [5] |  |  |  |  |  |  |  |  |  |  | 2,423 | 2,376 | 2,525
Baltimore Gas and Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 1,382 | 1,365 | 1,504
Baltimore Gas and Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 257 | 254 | 276
Baltimore Gas and Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 429 | 427 | 434
Baltimore Gas and Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 28 | 31 | 35
Baltimore Gas and Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  |  |  | 327 | 299 | 276
Baltimore Gas and Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 13 | 13 | 13
Baltimore Gas and Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 21 | 11 | 14
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  |  |  | 755 | 659 | 640
Baltimore Gas and Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 491 | 437 | 432
Baltimore Gas and Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 77 | 75 | 66
Baltimore Gas and Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 124 | 119 | 114
Baltimore Gas and Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  |  |  | 63 | 28 | 28
Baltimore Gas and Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Baltimore Gas and Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 4 | 4 | 2
Baltimore Gas and Electric Company [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 3,178 | 3,035 | 3,165
Baltimore Gas and Electric Company [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | (9) | 141 | 68
Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 15 | 50 |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 4,609 | 4,428 |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 181 | 161 |
Revenues |  | 1,117 | 1,361 | 1,076 | 1,251 | 1,121 | 1,310 | 1,074 | 1,175 |  |  | 4,805 | 4,679 |
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | 0 | 40 |
Pepco Holdings LLC [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  |  |  | 47 |
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | 0 | 40 |
Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 2
Electric operating revenues | [5] |  |  |  |  |  |  |  |  |  |  | 4,614 | 4,423 |
Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 2,351 | 2,246 |
Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 488 | 490 |
Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 1,124 | 1,086 |
Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 58 | 60 |
Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  |  |  | 593 | 541 |
Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 10 | 8 |
Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  |  |  | 180 | 160 |
Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 99 | 90 |
Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 44 | 38 |
Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 8 | 8 |
Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  |  |  | 13 | 9 |
Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 16 | 15 |
Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 1 | 1 |
Pepco Holdings LLC [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 4,794 | 4,583 |
Pepco Holdings LLC [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 15 |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 11 | 96 |
Potomac Electric Power Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 6 | 6 | 5
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 2,233 | 2,126 | 2,167
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues |  | 531 | 628 | 523 | 557 | 510 | 604 | 514 | 530 |  |  | 2,239 | 2,158 | 2,186
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | 0 | 26 | 14
Potomac Electric Power Company [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | 0 | 26 | 14
Potomac Electric Power Company [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [5] |  |  |  |  |  |  |  |  |  |  | 2,232 | 2,127 | 2,166
Potomac Electric Power Company [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 1,021 | 964 | 1,004
Potomac Electric Power Company [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 140 | 137 | 150
Potomac Electric Power Company [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 846 | 794 | 790
Potomac Electric Power Company [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 32 | 33 | 32
Potomac Electric Power Company [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  |  |  | 193 | 199 | 190
Potomac Electric Power Company [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 7 | 5 | 6
Potomac Electric Power Company [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Potomac Electric Power Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Potomac Electric Power Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0
Potomac Electric Power Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Potomac Electric Power Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Potomac Electric Power Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Potomac Electric Power Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Potomac Electric Power Company [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 2,232 | 2,127 | 2,166
Potomac Electric Power Company [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 7 | 31 | 20
Delmarva Power & Light Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 8 | 8 | 7
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 1,139 | 1,125 | 1,128
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 181 | 161 | 148
Revenues |  | 331 | 328 | 289 | 384 | 330 | 327 | 282 | 362 |  |  | 1,332 | 1,300 | 1,277
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | 4 | 6 | (6)
Delmarva Power & Light Company [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | 4 | 6 | (6)
Delmarva Power & Light Company [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [5] |  |  |  |  |  |  |  |  |  |  | 1,144 | 1,130 | 1,132
Delmarva Power & Light Company [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 669 | 663 | 672
Delmarva Power & Light Company [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 186 | 187 | 188
Delmarva Power & Light Company [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 100 | 103 | 99
Delmarva Power & Light Company [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 14 | 14 | 13
Delmarva Power & Light Company [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  |  |  | 175 | 163 | 160
Delmarva Power & Light Company [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 3 | 3 | 3
Delmarva Power & Light Company [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  |  |  | 180 | 160 | 148
Delmarva Power & Light Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 99 | 90 | 86
Delmarva Power & Light Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 44 | 38 | 35
Delmarva Power & Light Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 8 | 8 | 6
Delmarva Power & Light Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  |  |  | 13 | 9 | 8
Delmarva Power & Light Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 16 | 15 | 13
Delmarva Power & Light Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 0
Delmarva Power & Light Company [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 1,324 | 1,290 | 1,280
Delmarva Power & Light Company [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 8 | 10 | (3)
Atlantic City Electric Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  |  | 3 | 2 | 3
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 1,237 | 1,176 | 1,245
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues |  | $ 254 | $ 406 | $ 265 | $ 310 | $ 271 | $ 370 | $ 270 | $ 275 |  |  | 1,236 | 1,186 | 1,257
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (4) | 8 | 9
Atlantic City Electric Company [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  |  | (4) | 8 | 9
Atlantic City Electric Company [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [5] |  |  |  |  |  |  |  |  |  |  | 1,240 | 1,178 | 1,248
Atlantic City Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 661 | 619 | 664
Atlantic City Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 162 | 166 | 183
Atlantic City Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 178 | 189 | 201
Atlantic City Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  |  | 12 | 13 | 13
Atlantic City Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  |  |  | 227 | 191 | 187
Atlantic City Electric Company [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Atlantic City Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Atlantic City Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Atlantic City Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0
Atlantic City Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Atlantic City Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Atlantic City Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Atlantic City Electric Company [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Atlantic City Electric Company [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 1,240 | 1,178 | 1,248
Atlantic City Electric Company [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | (4) | 8 | $ 9
Successor [Member] | Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 3,643 |  |  |
Successor [Member] | Operating Segments [Member] | Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [1],[2],[3] |  |  |  |  |  |  |  |  |  | 3,506 |  |  |
Natural gas operating revenues | [1],[2],[3] |  |  |  |  |  |  |  |  |  | 92 |  |  |
Revenues | [1],[2],[3] |  |  |  |  |  |  |  |  |  | 3,643 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  |  | 45 | $ 15 | 50 |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  | 3,463 |  | 4,428 |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  | 92 |  | 161 |
Revenues |  |  |  |  |  |  |  |  |  |  | 3,643 |  | 4,679 |
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  | 43 |  | $ 40 |
Successor [Member] | Pepco Holdings LLC [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  |  | 43 |  |  |
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  |  | 43 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [5] |  |  |  |  |  |  |  |  |  | 3,459 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  | 1,779 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  | 400 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  | 835 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  |  | 45 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  |  | 400 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  |  | 6 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  |  | 92 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  | 50 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  | 21 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  | 4 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  |  | 7 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  |  | 10 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 3,551 |  |  |
Successor [Member] | Pepco Holdings LLC [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | $ 92 |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ 1,153 |  |  |  |
Predecessor [Member] | Operating Segments [Member] | Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [3] |  |  |  |  |  |  |  |  | 1,096 |  |  |  |
Natural gas operating revenues | [3] |  |  |  |  |  |  |  |  | 57 |  |  |  |
Revenues | [3] |  |  |  |  |  |  |  |  | 1,153 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues from affiliates |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  | 1,122 |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  | 57 |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,153 |  |  |  |
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  | (26) |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  | 0 |  |  |  |
Revenues from alternative revenue programs |  |  |  |  |  |  |  |  |  | (26) |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [5] |  |  |  |  |  |  |  |  | 1,119 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  | 561 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  | 121 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  | 255 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Public Authorities & Electric Railroads [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues |  |  |  |  |  |  |  |  |  | 13 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [6] |  |  |  |  |  |  |  |  | 169 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Electric Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric operating revenues | [7] |  |  |  |  |  |  |  |  | 3 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [8] |  |  |  |  |  |  |  |  | 57 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  | 36 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Small Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  | 14 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Large Commercial & Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [9] |  |  |  |  |  |  |  |  | 2 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Rate-Regulated Natural Gas Revenues [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Natural gas operating revenues | [7] |  |  |  |  |  |  |  |  | 0 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,176 |  |  |  |
Predecessor [Member] | Pepco Holdings LLC [Member] | Other Regulated Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | $ (23) |  |  |  |
[1] | Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 23 — Supplemental Financial Information for additional information on total utility taxes.
[2] | Amounts included represent activity for PHI's successor period, March 24, 2016 through December 31, 2018.
[3] | Includes gross utility tax receipts from customers. The offsetting remittance of utility taxes to the governing bodies is recorded in expenses in the Registrants’ Consolidated Statements of Operations and Comprehensive Income. See Note 23 — Supplemental Financial Information for additional information on total utility taxes.
[4] | Includes operating revenues from affiliates of $47 million and $43 million at PHI in 2017 and 2016, respectively.
[5] | Includes operating revenues from affiliates of $27 million, $7 million, $8 million, $15 million, $6 million, $8 million and $3 million at ComEd, PECO, BGE, PHI, Pepco, DPL and ACE, respectively, in 2018, $15 million, $6 million, $5 million, $3 million, $6 million, $8 million and $2 million at ComEd, PECO, BGE, PHI, Pepco, DPL and ACE, in 2017, and $15 million, $7 million, $7 million, $2 million, $5 million, $7 million and $3 million at ComEd, PECO, BGE, PHI, Pepco, DPL and ACE, respectively, in 2016.
[6] | Includes revenues from transmission revenue from PJM, wholesale electric revenue and mutual assistance revenue.
[7] | Includes late payment charge revenues.
[8] | Includes operating revenues from affiliates of $1 million and $21 million at PECO and BGE, respectively, in 2018, $1 million and $11 million at PECO and BGE, respectively, in 2017, and $1 million and $14 million at PECO and BGE, respectively, in 2016.
[9] | Includes revenues from off-system natural gas sales.

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