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Stock-Based Compensation Stock-Based Compensation (Supplemental - Details 5) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-Based Compensation      
Payments Related to Tax Withholding for Share-based Compensation $ 5 $ 21 $ 16
Allocated Share-based Compensation Expense 24 41 42
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 27    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense (4) (12) (8)
Non-Qualified Stock Options [Member]      
Stock-Based Compensation      
Allocated Share-based Compensation Expense [1] 0 0 1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [1] $ 0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition [1] 0 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Restricted Stock Units (RSUs)      
Stock-Based Compensation      
Allocated Share-based Compensation Expense $ 14 23 20
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 12    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 5 months 14 days    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Deferred Stock Units      
Stock-Based Compensation      
Allocated Share-based Compensation Expense $ 2 2 2
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 0    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 0 years    
Market Stock Unit [Member]      
Stock-Based Compensation      
Allocated Share-based Compensation Expense $ 3 16 19
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 7    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 6 months 16 days    
Phantom Share Units (PSUs) [Member]      
Stock-Based Compensation      
Allocated Share-based Compensation Expense [2] $ 5 $ 0 $ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [2] $ 8    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition [2] 1 year 3 months 20 days    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
[1] All NQSOs granted under the Company's LTIP were fully vested as of December 31, 2016 and 2015.
[2] Phantom Restricted Stock Units, PRSUs, are liability-classified time-based awards that typically vest ratably over a three-year period. The amount to be paid upon vesting is based on NRG's closing stock price for the period.