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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Segment Reporting Information
 
For the Year Ended December 31, 2018
 
Retail (a)

Generation(a)

Corporate(a)

Eliminations 

Total
 
(In millions)
Operating revenues(a)
$
7,103


$
3,432


$
11


$
(1,068
)

$
9,478

Operating expenses
5,919


3,019


125


(1,066
)

7,997

Depreciation and amortization
116


272


33


—


421

Impairment losses
1


98


—


—


99

Development costs
1


9


2


(1
)

11

Total operating cost and expenses
6,037


3,398


160


(1,067
)

8,528

Gain on sale of assets
—


2


30


—


32

Operating income/(loss)
1,066


36


(119
)

(1
)

982

Equity in earnings of unconsolidated affiliates
—


10


4


(5
)

9

Impairment losses on investments
—


(15
)

—


—


(15
)
Other income/(expenses), net
—


20


(1
)

(1
)

18

Loss on debt extinguishment
—


—


(44
)

—


(44
)
Interest expense
(3
)

(58
)

(422
)

—


(483
)
Income/(loss) from continuing operations before income taxes
1,063


(7
)

(582
)

(7
)

467

Income tax expense
1


—


6


—


7

Net income/(loss) from continuing operations
1,062


(7
)

(588
)

(7
)

460

Loss from discontinued operations, net of income tax
—


—


(192
)

—


(192
)
Net Income/(loss)
1,062


(7
)

(780
)

(7
)

268

Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests
1


9


(5
)

(5
)

—

Net income/(loss) attributable to NRG Energy, Inc.
$
1,061


$
(16
)

$
(775
)

$
(2
)

$
268











Balance sheet


 

 




Equity investments in affiliates
$
—


$
412


$
—


$
—


$
412

Capital expenditures
90


267


31


—


388

Goodwill
408


165


—


—


573

Total assets
$
3,291


$
5,735


$
7,003


$
(5,401
)

$
10,628

(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$
9

 
$
1,085

 
$
(26
)
 
$
—

 
$
1,068






 
For the Year Ended December 31, 2017
 
Retail (a)

Generation(a)

Corporate(a)

Eliminations

Total
 
(In millions)
Operating revenues(a)
$
6,369


$
3,615


$
13


$
(923
)

$
9,074

Operating expenses
5,377


3,071


243


(925
)

7,766

Depreciation and amortization
110


454


35


(3
)

596

Impairment losses
8


1,526


—


—


1,534

Development costs
3


13


6


—


22

Total operating cost and expenses
5,498


5,064


284


(928
)

9,918

   Other income - affiliate
—


—


87


—


87

  Gain on sale of assets
—


15


1


—


16

Operating income/(loss)
871


(1,434
)

(183
)

5


(741
)
Equity in (losses)/earnings of unconsolidated affiliates
—


(14
)

5


(5
)

(14
)
Impairment losses on investments
—


(75
)

(4
)

—


(79
)
Other income, net
—


23


28


—


51

Loss on debt extinguishment
—


—


(49
)

—


(49
)
Interest expense
(6
)

(100
)

(451
)

—


(557
)
Income/(loss) from continuing operations before income taxes
865


(1,600
)

(654
)

—


(1,389
)
Income tax (benefit)/expense
(8
)

2


(38
)

—


(44
)
Net income/(loss) from continuing operations
873


(1,602
)

(616
)

—


(1,345
)
Loss from discontinued operations, net of income tax
—


—


(992
)

—


(992
)
Net Income/(loss)
873


(1,602
)

(1,608
)

—


(2,337
)
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests
1


4


(189
)

—


(184
)
Net income/(loss) attributable to NRG Energy, Inc.
$
872


$
(1,606
)

$
(1,419
)

$
—


$
(2,153
)











Balance sheet


 

 

 

 
Equity investments in affiliates
$
—


$
179


$
95


$
(92
)

$
182

Capital expenditures
82


148


20


—


250

Goodwill
374


165


—


—


539

Total assets
$
2,655


$
9,090


$
17,402


$
(5,792
)

$
23,355


(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$
4

 
$
877

 
$
42

 
$
—

 
$
923






 
For the Year Ended December 31, 2016
 
Retail
 
Generation(a)
 
Corporate(a)
 
Eliminations
 
Total
 
(In millions)
Operating revenues(a)
$
6,330

 
$
3,633

 
$
74

 
$
(1,122
)
 
$
8,915

Operating expenses
5,162

 
3,322

 
353

 
(1,129
)
 
7,708

Depreciation and amortization
114

 
593

 
52

 
(3
)
 
756

Impairment losses
1

 
452

 
30

 
—

 
483

Development costs
4

 
15

 
29

 
—

 
48

Total operating costs and expenses
5,281

 
4,382

 
464

 
(1,132
)
 
8,995

Other income - affiliate
—

 
—

 
193

 
—

 
193

Loss on sale of assets
(1
)
 
—

 
(79
)
 
—

 
(80
)
Operating income/(loss)
1,048

 
(749
)
 
(276
)
 
10

 
33

Equity in (losses)/earnings of unconsolidated affiliates
—

 
(63
)
 
45

 
—

 
(18
)
Impairment losses on investments
—

 
(248
)
 
(20
)
 
—

 
(268
)
Other (expense)/income, net
(6
)
 
22

 
33

 
(2
)
 
47

Loss on debt extinguishment
—

 
—

 
(142
)
 
—

 
(142
)
Interest expense
6

 
(96
)
 
(495
)
 
2

 
(583
)
Income/(loss) from continuing operations before income taxes
1,048

 
(1,134
)
 
(855
)
 
10

 
(931
)
Income tax expense/(benefit)
1

 
(1
)
 
25

 
—

 
25

Net income/(loss) from continuing operations
$
1,047

 
$
(1,133
)
 
(880
)
 
10

 
(956
)
Income from discontinued operations, net of income tax
—

 
—

 
65

 
—

 
65

Net Income/(loss)
1,047

 
(1,133
)
 
(815
)
 
10

 
(891
)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests
—

 
(1
)
 
(104
)
 
(12
)
 
(117
)
Net income/(loss) attributable to NRG Energy, Inc.
$
1,047

 
$
(1,132
)
 
$
(711
)
 
$
22

 
$
(774
)
(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$
16

 
$
999

 
$
107

 
$
—

 
$
1,122