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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation [Abstract]  
Schedule of Share-based Payment Awards, Market Unit Valuation Assumptions [Table Text Block]
Significant assumptions used in the fair value model with respect to the Company's MSUs are summarized below:
 
2016
 
2015
Expected volatility
34.33
%
 
24.08%-25.20%
Expected term (in years)
3

 
1-3
Risk free rate
1.31
%
 
0.25%-1.07%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Company's NQSO activity, and changes during the year
The following table summarizes the Company's NQSO activity and changes during the year:
 
Shares
 
Weighted Average
Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
 
 
 
(In years)
 
 (In millions)
Outstanding at December 31, 2015
2,071,913

 
$
32.27

 
3
 
$
—

Forfeited
(548,994
)
 
52.34

 
 
 
 
Outstanding at December 31, 2016
1,522,919

 
25.03

 
3
 
—

Exercisable at December 31, 2016
1,522,919

 
25.03

 
3
 
—
Summary of weighted average grant date fair value of options granted, the total intrinsic value of options exercised, and the cash received from the exercises of options
The following table summarizes the total intrinsic value of options exercised and the cash received from the exercises of options:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(In millions)
Total intrinsic value of options exercised
$
—

 
$
2

 
$
7

Cash received from options exercised
—

 
9

 
21
Summary of Company's non-vested RSU awards and changes during the year
The following table summarizes the Company's non-vested RSU awards and changes during the year:
 
Units
 
Weighted Average Grant-Date Fair Value per Unit
Non-vested at December 31, 2015
2,261,996

 
$
27.59

Granted
1,226,957

 
11.54

Forfeited
(592,163
)
 
22.91

Vested
(916,649
)
 
26.07

Non-vested at December 31, 2016
1,980,141

 
19.29
Summary of significant assumptions used in the fair value model with respect to the Company's MSUs
The following table summarizes the Company's outstanding DSU awards and changes during the year:
 
Units
 
Weighted Average Grant-Date Fair Value per Unit
Outstanding at December 31, 2015
427,578

 
$
21.88

Granted
102,147

 
16.85

Converted to Common Stock
(76,051
)
 
18.37

Outstanding at December 31, 2016
453,674

 
21.54
Summary of NRG's total compensation expense recognized and total non-vested compensation costs not yet recognized and the period over which this expense is expected to be recognized
The following table summarizes NRG's total compensation expense recognized for the years presented as well as total non-vested compensation costs not yet recognized and the period over which this expense is expected to be recognized as of December 31, 2016 for each of the types of awards issued under the LTIPs. Minimum tax withholdings of $5 million, $21 million, and $16 million for the years ended December 31, 2016, 2015, and 2014, respectively, are reflected as a reduction to additional paid-in capital on the Company's consolidated balance sheet and are reflected as operating activities on the Company's consolidated statement of cash flows.
 
 
 
 
 
 
 
Non-vested Compensation Cost
 
Compensation Expense
 
Unrecognized
Total Cost
 
Weighted Average Recognition Period Remaining (In years)
 
Year Ended December 31
 
As of December 31
Award
2016
 
2015
 
2014
 
2016
 
2016
 
(In millions, except weighted average data)
NQSOs(a)
$
—

 
$
—

 
$
1

 
$
—

 
—

RSUs
14

 
23

 
20

 
12

 
1.46

DSUs
2

 
2

 
2

 
—

 
—

MSUs
3

 
16

 
19

 
7

 
1.54

PRSUs(b)
5

 
—

 
—

 
8

 
1.30

Total
$
24

 
$
41

 
$
42

 
$
27

 
 

Tax detriment recognized
$
(4
)
 
$
(12
)
 
$
(8
)
 
 

 
 


(a) All NQSOs granted under the Company's LTIP were fully vested as of December 31, 2016 and 2015.
(b) 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.
Market Stock Unit [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Company's outstanding DSU awards and changes during the year
The following table summarizes the Company's non-vested MSU awards and changes during the year:
 
Units
 
Weighted Average Grant-Date Fair Value per Unit
Non-vested at December 31, 2015
1,980,157

 
$
29.54

Granted
806,409

 
14.73

Forfeited
(1,499,963
)
 
27.76

Vested
(4,015
)
 
33.81

Non-vested at December 31, 2016
1,282,588

 
21.47