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Acquisitions, Discontinued Operations and Dispositions - Summarized Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
(Loss)/gain on disposal of discontinued operations, net of tax     $ 0 $ (13)
(Loss)/gain from discontinued operations, net of tax $ (2) $ (336) 399 (272)
Discontinued Operations | South Central Portfolio        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenues 0 101 31 310
Operating costs and expenses 0 (85) (23) (262)
Gain from discontinued operations, net of tax 0 16 8 48
(Loss)/gain on disposal of discontinued operations, net of tax (1) 0 27 0
(Loss)/gain from discontinued operations, net of tax (1) 16 35 48
Discontinued Operations | Carlsbad Energy Holdings LLC        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenues 0 297 19 925
Operating costs and expenses 0 (229) (9) (682)
Other expense 0 (42) (5) (165)
Gain from discontinued operations, before tax 0 26 5 78
Income tax expense 0 9 0 4
Gain from discontinued operations, net of tax 0 17 5 74
(Loss)/gain on disposal of discontinued operations, net of tax (1) (139) 330 (139)
(Expense)/Income from California property tax indemnification 0   22 (153)
(Expense)/income from other commitments, indemnification and fees 0 (77) 5 (77)
(Loss)/gain on disposal of discontinued operations, net of tax (1) (369) 357 (369)
(Loss)/gain from discontinued operations, net of tax $ (1) $ (352) $ 362 $ (295)