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Acquisitions, Discontinued Operations and Dispositions - Discontinued Operations (Details) $ in Millions			3 Months Ended		9 Months Ended
	Aug. 31, 2018 USD ($)	Feb. 06, 2018 USD ($) extension	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other non-current liabilities			$ 1,177		$ 1,177		$ 1,002
Loss from discontinued operations			354	$ 22	320	$ 798
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Commitment and advisory fees	$ 50
NRG Yield and Renewables | Agua Caliente solar project
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest prior to disposal	51.00%
Ownership interest after disposal	35.00%
Gain on sale	$ 8
NRG Yield and Renewables | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration	1,348
NRG Yield and Renewables | Discontinued Operations | Scenario, Adjustment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other non-current liabilities	$ (153)
Loss from discontinued operations		$ 153
Carlsbad Energy Holdings LLC | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash consideration		$ 365
Loss from discontinued operations			$ 354	$ (5)	$ 295	$ (4)
Membership interest		100.00%
Lease and easement agreement, number of extensions | extension		2
Lease, renewal term		10 years
Other project commitments		$ 23

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