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Acquisitions, Discontinued Operations and Dispositions - Rockford Disposition (Details) $ in Millions			3 Months Ended	12 Months Ended
	Jul. 12, 2016 USD ($)	May 12, 2016 USD ($) MW	Jun. 30, 2016 USD ($)	Dec. 31, 2018 USD ($) MW	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Generation capacity (in MW) | MW				23,000
Impairment losses				$ 99	$ 1,534	$ 483
Rockford
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment losses						$ 17
Proceeds from sale		$ 55
Discontinued Operations, Held-for-sale or Disposed of by Sale | Rockford
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership interest		100.00%
Cash consideration		$ 55
Generation capacity (in MW) | MW		450
Impairment losses			$ 17
Proceeds from sale	$ 56
Adjustments for base residual auction results	$ 1

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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