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Discontinued Operations and Dispositions - Summarized of Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Gain/(Loss) from discontinued operations, net of tax $ 388 $ (5)
Discontinued Operations | South Central Portfolio    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Operating revenues 31 102
Operating costs and expenses (23) (86)
Loss from discontinued operations, net of tax 8 16
Gain on disposal of discontinued operations, net of tax 27 0
Gain/(Loss) from discontinued operations, net of tax 35 16
Discontinued Operations | Carlsbad Energy Holdings LLC    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Operating revenues 19 260
Operating costs and expenses (9) (230)
Other expenses (5) (58)
Gain/(loss) from operations of discontinued components, before tax 5 (28)
Income tax expense 0 (7)
Loss from discontinued operations, net of tax 5 (21)
Gain on disposal of discontinued operations, net of tax 348 0
Gain/(Loss) from discontinued operations, net of tax $ 353 $ (21)