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Discontinued Operations and Dispositions - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gain from discontinued operations, net of tax | $ 0 | $ 388
Discontinued Operations, Disposed of by Sale | South Central Portfolio |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Operating revenues |  | 31
Operating costs and expenses |  | (23)
Gain from operations of discontinued components |  | 8
Gain on disposal of discontinued operations, net of tax |  | 27
Gain from discontinued operations, net of tax |  | 35
Discontinued Operations, Disposed of by Sale | Carlsbad Energy Holdings LLC |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Operating revenues |  | 19
Operating costs and expenses |  | (9)
Other expense |  | (5)
Gain from operations of discontinued components |  | 5
Gain on disposal of discontinued operations, net of tax |  | 348
Gain from discontinued operations, net of tax |  | $ 353

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