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Acquisitions, Discontinued Operations and Dispositions - Summarized Results of GenOn (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 from discontinued operations, net of tax	$ (2)	$ (336)	$ 399	$ (272)
GenOn \| Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest income - affiliate			0	3
Pension and post-retirement liability assumption			0	(2)
Other			2	(26)
(Loss)/gain from discontinued operations, net of tax			$ 2	$ (25)

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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