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Discontinued Operations, Acquisitions and Dispositions - Transfer of Assets Under Common Control (Details) $ in Millions	Dec. 31, 2017 USD ($) MW	Nov. 01, 2017 USD ($) MW	Aug. 01, 2017 USD ($) wind_project	Mar. 27, 2017 USD ($) MW	Dec. 31, 2016 USD ($)	Sep. 01, 2016 USD ($)	Nov. 03, 2015 USD ($) facility MW	Jan. 02, 2015 USD ($)
Business Acquisition [Line Items]
Generation capacity (in MW) | MW	30,000
Long-term debt	$ 16,633.0				$ 16,704.0
SPP
Business Acquisition [Line Items]
Generation capacity (in MW) | MW		38
Cash consideration		$ 71.0
Working capital adjustments		$ 3.0
NRG Wind TE Holdco
Business Acquisition [Line Items]
Cash consideration			$ 44.0
Working capital adjustments			$ 3.0
Percentage of ownership sold			25.00%
Number of projects sold | wind_project			12
Agua Caliente Solar Project
Business Acquisition [Line Items]
Cash consideration				$ 130.0
Working capital adjustments				1.0
Debt assumed				$ 328.0
CVSR
Business Acquisition [Line Items]
Percentage of ownership sold						51.05%
Cash consideration received						$ 78.5
ROFO Assets
Business Acquisition [Line Items]
Generation capacity (in MW) | MW							814
Percentage of ownership sold							75.00%
Cash consideration received							$ 209.0	$ 489.0
Long-term debt							$ 193.0	737.0
Number of facilities | facility							12
Cash consideration net of working capital adjustments							$ 207.0
NRG Yield, Inc. | CVSR
Business Acquisition [Line Items]
Long-term debt						$ 496.0
Financial Institutions | ROFO Assets
Business Acquisition [Line Items]
Noncontrolling interest							159.0
Working Capital Adjustment | ROFO Assets
Business Acquisition [Line Items]
Cash consideration received							$ 2.0	$ 9.0
Agua Caliente | Agua Caliente Solar Project
Business Acquisition [Line Items]
Generation capacity (in MW) | MW				46
Percentage of ownership sold				16.00%
Utah Portfolio | Agua Caliente Solar Project
Business Acquisition [Line Items]
Generation capacity (in MW) | MW				265

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