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Acquisitions, Discontinued Operations and Dispositions - Summarized of Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss on deconsolidation, net of tax     $ (13) $ 0
Gain/(Loss) from discontinued operations, net of tax $ (354) $ (22) (320) (798)
Discontinued Operations | Carlsbad Energy Holdings LLC        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenues 280 315 925 906
Operating costs and expenses (212) (242) (682) (690)
Other expenses (44) (64) (165) (210)
Gain/(loss) from operations of discontinued components, before tax 24 9 78 6
Income tax expense 9 4 4 2
Loss from discontinued operations, net of tax 15 5 74 4
Loss on deconsolidation, net of tax (139) 0 (139) 0
California property tax indemnification (153) 0 (153) 0
Other (77) 0 (77) 0
Loss on disposal of discontinued operations, net of tax (369) 0 (369) 0
Gain/(Loss) from discontinued operations, net of tax (354) 5 (295) 4
Discontinued Operations | GenOn        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenues 0 0 0 646
Operating costs and expenses 0 0 0 (700)
Other expenses 0 0 0 (98)
Gain/(loss) from operations of discontinued components, before tax 0 0 0 (152)
Income tax expense 0 0 0 9
Loss from discontinued operations 0 0 0 (161)
Interest income - affiliate 0 0 3 6
Loss from discontinued operations, net of tax 0 0 3 (155)
Pre-tax loss on deconsolidation 0 0 0 (208)
Settlement consideration and services credit 0 0 1 (289)
Pension and post-retirement liability assumption 0 (25) (2) (144)
Other 0 (2) (27) (6)
Loss on disposal of discontinued operations, net of tax 0 (27) (28) (647)
Gain/(Loss) from discontinued operations, net of tax $ 0 $ (27) $ (25) $ (802)