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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | $ 2,504 | $ 2,431 | $ 6,066 | $ 6,292
Mark-to-market for economic hedging activities | (64) | (68) | (23) | 62
Operating revenues | 2,996 | 2,960 | 7,626 | 7,486
Lease revenue | 5 | 6 | 15 | 17
Derivative revenue | (68) | (64) | (8) | 79
Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 442 | 445 | 997 | 1,298
Derivative revenue | 668 | 418 | 1,398 | 1,081
Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 152 | 192 | 461 | 500
Derivative revenue | 33 | 45 | 81 | 110
Retail revenue | Mass customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,080 | 1,766 | 4,800 | 4,317
Retail revenue | Business Solutions customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 465 | 434 | 1,096 | 1,181
Total retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,545 | 2,200 | 5,896 | 5,498
Derivative revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (210) | 55 | 51 | (31)
Derivative revenue | 487 | 523 | 1,545 | 1,177
Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 67 | 68 | 221 | 221
Total operating revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 2,996 | 2,960 | 7,626 | 7,486
Other revenue, derivative |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | (4) | 5 | 15 | 17
Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | (5) | (4) | (26)
Operating revenues | (522) | (722) | (1,437) | (927)
Lease revenue | 0 | 0 | 0 | 0
Corporate/Eliminations | Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (568) | (479) | (1,209) | (890)
Derivative revenue | (569) | (475) | (1,211) | (880)
Corporate/Eliminations | Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1 | 1 | 1 | 1
Derivative revenue | 0 | 0 | 1 | 0
Corporate/Eliminations | Retail revenue | Mass customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | (2) | (2) | (4)
Corporate/Eliminations | Retail revenue | Business Solutions customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Corporate/Eliminations | Total retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | (2) | (2) | (4)
Corporate/Eliminations | Derivative revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | 47 | (241) | (223) | (21)
Derivative revenue | (522) | (716) | (1,433) | (901)
Corporate/Eliminations | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (2) | 0 | (4) | (13)
Corporate/Eliminations | Total operating revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | (522) | (721) | (1,437) | (927)
Corporate/Eliminations | Other revenue, derivative |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 0 | 0 | 0 | 0
Retail | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,542 | 2,199 | 5,889 | 5,492
Operating revenues | 2,544 | 2,203 | 5,899 | 5,497
Lease revenue | 3 | 3 | 9 | 10
Retail | Operating Segments | Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Derivative revenue | 0 | 0 | 0 | 0
Retail | Operating Segments | Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Derivative revenue | 0 | 0 | 0 | 0
Retail | Operating Segments | Retail revenue | Mass customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,080 | 1,768 | 4,802 | 4,321
Retail | Operating Segments | Retail revenue | Business Solutions customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 465 | 434 | 1,096 | 1,181
Retail | Operating Segments | Total retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 2,545 | 2,202 | 5,898 | 5,502
Retail | Operating Segments | Derivative revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (1) | 1 | 1 | (5)
Derivative revenue | (1) | 1 | 1 | (5)
Retail | Operating Segments | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Retail | Operating Segments | Total operating revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 2,544 | 2,203 | 5,899 | 5,497
Retail | Operating Segments | Other revenue, derivative |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 0 | 0 | 0 | 0
Retail | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | (1) | (1) | (6) | (7)
Generation | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (38) | 237 | 181 | 826
Operating revenues | 974 | 1,478 | 3,164 | 2,916
Lease revenue | 2 | 3 | 6 | 7
Generation | Operating Segments | Texas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | (379) | (306) | (736) | (562)
Lease revenue | 0 | 0 | 0 | 0
Generation | Operating Segments | East/West/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 341 | 543 | 917 | 1,388
Lease revenue | 2 | 3 | 6 | 7
Generation | Operating Segments | Energy revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 1,010 | 924 | 2,206 | 2,188
Derivative revenue | 1,237 | 893 | 2,609 | 1,961
Generation | Operating Segments | Energy revenue | Texas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 773 | 585 | 1,628 | 1,251
Derivative revenue | 1,175 | 901 | 2,417 | 1,883
Generation | Operating Segments | Energy revenue | East/West/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 237 | 339 | 578 | 937
Derivative revenue | 62 | (8) | 192 | 78
Generation | Operating Segments | Capacity revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 151 | 191 | 460 | 499
Derivative revenue | 33 | 45 | 80 | 110
Generation | Operating Segments | Capacity revenue | Texas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 1 | 0 | 1
Derivative revenue | 0 | 0 | 0 | 0
Generation | Operating Segments | Capacity revenue | East/West/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 151 | 190 | 460 | 498
Derivative revenue | 33 | 45 | 80 | 110
Generation | Operating Segments | Retail revenue | Mass customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Retail revenue | Business Solutions customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Retail revenue | Texas | Mass customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Retail revenue | Texas | Business Solutions customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Retail revenue | East/West/Other | Mass customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Retail revenue | East/West/Other | Business Solutions customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Total retail revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Total retail revenue | Texas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Total retail revenue | East/West/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0
Generation | Operating Segments | Derivative revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (256) | 295 | 273 | (5)
Derivative revenue | 1,010 | 1,238 | 2,977 | 2,083
Generation | Operating Segments | Derivative revenue | Texas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (240) | 259 | 233 | (14)
Derivative revenue | 944 | 1,159 | 2,674 | 1,872
Generation | Operating Segments | Derivative revenue | East/West/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Mark-to-market for economic hedging activities | (16) | 36 | 40 | 9
Derivative revenue | 66 | 79 | 303 | 211
Generation | Operating Segments | Other revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 69 | 68 | 225 | 234
Generation | Operating Segments | Other revenue | Texas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 32 | 8 | 77 | 72
Generation | Operating Segments | Other revenue | East/West/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contracts with customers | 37 | 60 | 148 | 162
Generation | Operating Segments | Total operating revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 974 | 1,478 | 3,164 | 2,916
Generation | Operating Segments | Total operating revenue | Texas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 565 | 853 | 1,938 | 1,310
Generation | Operating Segments | Total operating revenue | East/West/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | 409 | 625 | 1,226 | 1,606
Generation | Operating Segments | Other revenue, derivative |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | (4) | 5 | 15 | 17
Generation | Operating Segments | Other revenue, derivative | Texas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | 9 | (1) | 24 | 3
Generation | Operating Segments | Other revenue, derivative | East/West/Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Derivative revenue | (13) | 6 | (9) | 14
Generation | Corporate/Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Operating revenues | $ (513) | $ (739) | $ (1,375) | $ (944)

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