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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 1,779 | $ 1,804
Mark-to-market for economic hedging activities | 20 | 206
Operating revenues | 2,165 | 2,065
Lease revenue | 5 | 5
Derivative revenue | 27 | 214
Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 306 | 443
Derivative revenue | 336 | 316
Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 154 | 142
Derivative revenue | 18 | 26
Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,320 | 1,175
Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 286 | 310
Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,606 | 1,485
Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 20 | (96)
Derivative revenue | 381 | 256
Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 79 | 91
Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 2,165 | 2,065
Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 7 | 8
Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (3) | (12)
Operating revenues | (266) | 314
Lease revenue | 0 | 0
Corporate/Eliminations | Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (276) | (161)
Derivative revenue | (277) | (157)
Corporate/Eliminations | Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (1) | 0
Derivative revenue | 0 | 0
Corporate/Eliminations | Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (1) | (1)
Corporate/Eliminations | Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Corporate/Eliminations | Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (1) | (1)
Corporate/Eliminations | Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 15 | 484
Derivative revenue | (262) | 327
Corporate/Eliminations | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (2) | (7)
Corporate/Eliminations | Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | (265) | 315
Corporate/Eliminations | Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 0 | 0
Retail | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,604 | 1,483
Operating revenues | 1,607 | 1,480
Lease revenue | 3 | 3
Retail | Operating Segments | Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Retail | Operating Segments | Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Retail | Operating Segments | Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,321 | 1,176
Retail | Operating Segments | Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 286 | 310
Retail | Operating Segments | Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 1,607 | 1,486
Retail | Operating Segments | Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 0 | (6)
Derivative revenue | 0 | (6)
Retail | Operating Segments | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Retail | Operating Segments | Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 1,607 | 1,480
Retail | Operating Segments | Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 0 | 0
Retail | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | (3) | (1)
Generation | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 178 | 333
Operating revenues | 823 | 270
Lease revenue | 2 | 2
Generation | Operating Segments | Texas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | (146) | (101)
Lease revenue | 0 | 0
Generation | Operating Segments | East/West/Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 324 | 434
Lease revenue | 2 | 2
Generation | Operating Segments | Energy revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 582 | 604
Derivative revenue | 613 | 473
Generation | Operating Segments | Energy revenue | Texas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 358 | 265
Derivative revenue | 525 | 413
Generation | Operating Segments | Energy revenue | East/West/Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 224 | 339
Derivative revenue | 88 | 60
Generation | Operating Segments | Capacity revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 155 | 142
Derivative revenue | 18 | 26
Generation | Operating Segments | Capacity revenue | Texas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Derivative revenue | 0 | 0
Generation | Operating Segments | Capacity revenue | East/West/Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 155 | 142
Derivative revenue | 18 | 26
Generation | Operating Segments | Retail revenue | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Generation | Operating Segments | Retail revenue | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Generation | Operating Segments | Retail revenue | Texas | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Generation | Operating Segments | Retail revenue | Texas | Business Solutions customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Generation | Operating Segments | Retail revenue | East/West/Other | Mass customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 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
Generation | Operating Segments | Total retail revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Generation | Operating Segments | Total retail revenue | Texas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Generation | Operating Segments | Total retail revenue | East/West/Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Generation | Operating Segments | Derivative revenue |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 5 | (574)
Derivative revenue | 643 | (65)
Generation | Operating Segments | Derivative revenue | Texas |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | 13 | (569)
Derivative revenue | 546 | (150)
Generation | Operating Segments | Derivative revenue | East/West/Other |  |
Disaggregation of Revenue [Line Items] |  |
Mark-to-market for economic hedging activities | (8) | (5)
Derivative revenue | 97 | 85
Generation | Operating Segments | Other revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 81 | 98
Generation | Operating Segments | Other revenue | Texas |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 29 | 53
Generation | Operating Segments | Other revenue | East/West/Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 52 | 45
Generation | Operating Segments | Total operating revenue |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 823 | 270
Generation | Operating Segments | Total operating revenue | Texas |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 400 | (251)
Generation | Operating Segments | Total operating revenue | East/West/Other |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | 423 | 521
Generation | Operating Segments | Other revenue, derivative |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 7 | 8
Generation | Operating Segments | Other revenue, derivative | Texas |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | 8 | 5
Generation | Operating Segments | Other revenue, derivative | East/West/Other |  |
Disaggregation of Revenue [Line Items] |  |
Derivative revenue | (1) | 3
Generation | Corporate/Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenues | $ (235) | $ 309

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