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Acquisitions, Discontinued Operations and Dispositions - Summarized Results of GenOn (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(Loss) from discontinued operations, net of tax	$ 13	$ 69	$ 401	$ 64
GenOn | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income - affiliate	0	2	0	3
Pension and post-retirement liability assumption	0	1	0	1
Advisory and consulting fees	0	(1)	0	(2)
Other	2	(27)	2	(27)
Gain/(Loss) from discontinued operations, net of tax	$ 2	$ (25)	$ 2	$ (25)

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