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Summary of Significant Accounting Policies - Noncontrolling Interest (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Noncontrolling Interest [Roll Forward]        
Balance as of beginning of period     $ 2,314  
Dividends paid to NRG Yield, Inc. public shareholders     (61)  
Distributions to noncontrolling interest     (34)  
Comprehensive loss attributable to noncontrolling interest $ 26 $ (17) (12) $ (56)
Contributions from noncontrolling interest     295  
Sale of assets to NRG Yield, Inc.     (8)  
Deconsolidation of Ivanpah     (89)  
Balance as of end of period $ 2,437   2,437  
Noncontrolling Interest        
Noncontrolling Interest [Roll Forward]        
Comprehensive loss attributable to noncontrolling interest     12  
Non-cash adjustments to noncontrolling interest     $ 8