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Segment Reporting
 6 Months Ended
Jun. 30, 2019
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
The Company's segment structure reflects how management currently makes financial decisions and allocates resources. The Company's businesses are segregated into the Retail, Generation and corporate segments. Generation includes all power plant activities, domestic and international, as well as renewables. Retail includes Mass customers and Business Solutions, which includes C&I customers and other distributed and reliability products. Intersegment sales are accounted for at market.The financial information for the six months ended June 30, 2018 has been recast to reflect the current segment structure.
On February 4, 2019, as described in Note 4, Acquisitions, Discontinued Operations and Dispositions, the Company completed the sale of and deconsolidated the South Central Portfolio. On August 31, 2018, as described in Note 4, Acquisitions, Discontinued Operations and Dispositions, NRG deconsolidated NRG Yield, Inc., its Renewables Platform and Carlsbad for financial reporting purposes. The financial information for the six months ended June 30, 2018, has been recast to reflect the presentation of these entities as discontinued operations within the corporate segment.
NRG’s chief operating decision maker, its chief executive officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, free cash flow and capital for allocation, as well as net income/(loss) and net income/(loss) attributable to NRG Energy, Inc.
 
Three months ended June 30, 2019(a)
 
Retail
 
Generation
 
Corporate
 
Eliminations
 
Total
 
(In millions)
Operating revenues(b)
$
1,748

 
$
1,367

 
$
—

 
$
(650
)
 
$
2,465

Depreciation and amortization
32

 
45

 
8

 
—

 
85

Impairment losses
1

 
—

 
—

 
—

 
1

Reorganization costs
2

 
—

 
—

 
—

 
2

Gain on sale of assets
—

 
—

 
1

 
—

 
1

Loss on debt extinguishment, net
—

 
—

 
(47
)
 
—

 
(47
)
(Loss)/income from continuing operations before income taxes
(280
)
 
618

 
(151
)
 
1

 
188

(Loss)/income from continuing operations
(280
)
 
618

 
(150
)
 
1

 
189

Income from discontinued operations, net of tax
—

 
—

 
13

 
—

 
13

Net (loss)/income
(280
)
 
618

 
(137
)
 
1

 
202

Net (loss)/income attributable to NRG Energy, Inc.
$
(281
)
 
$
618

 
$
(137
)
 
$
1

 
$
201

 
(a) Includes intersegment revenues and costs associated with the internal transfer of power, which is based on average annualized market prices and results in higher revenues in Generation and higher cost of operations in Retail that are eliminated in consolidation
(b) Operating revenues include intersegment sales and net derivative gains and losses of:
$
2

 
$
627

 
$
21

 
$
—

 
$
650

 
Three months ended June 30, 2018(a)
 
Retail
 
Generation
 
Corporate
 
Eliminations
 
Total
 
(In millions)
Operating revenues(b)
$
1,814

 
$
1,167

 
$
—

 
$
(520
)
 
$
2,461

Depreciation and amortization
30

 
74

 
9

 
(1
)
 
112

Reorganization costs
1

 
3

 
19

 
—

 
23

Equity in earnings of unconsolidated affiliates
—

 
5

 
2

 
(2
)
 
5

(Loss)/income from continuing operations before income taxes
(84
)
 
252

 
(137
)
 
1

 
32

(Loss)/income from continuing operations
(84
)
 
252

 
(142
)
 
1

 
27

Income from discontinued operations, net of tax
—

 
—

 
69

 
—

 
69

Net (loss)/income
(84
)
 
252

 
(73
)
 
1

 
96

Net (loss)/income attributable to NRG Energy, Inc.
$
(84
)
 
$
250

 
$
(97
)
 
$
3

 
$
72

 
(a) Includes intersegment revenues and costs associated with our internal transfer of power, which is based on average annualized market prices and results in higher revenues in Generation and higher cost of operations in Retail that are eliminated in consolidation
(b) Operating revenues include intersegment sales and net derivative gains and losses of:
$
4

 
$
514

 
$
2

 
$
—

 
$
520




 
Six months ended June 30, 2019 (a)
 
Retail
 
Generation
 
Corporate
 
Eliminations
 
Total
 
(In millions)
Operating revenues(b)
$
3,355

 
$
2,190

 
$
—

 
$
(915
)
 
$
4,630

Depreciation and amortization
63

 
91

 
16

 
—

 
170

Impairment losses
1

 
—

 
—

 
—

 
1

Reorganization costs
3

 
1

 
11


—

 
15

Gain on sale of assets
—

 
1

 
1

 
—

 
2

Equity in losses of unconsolidated affiliates
—

 
(21
)
 
—

 
—

 
(21
)
Loss on debt extinguishment, net
—

 
—

 
(47
)
 
—

 
(47
)
(Loss)/income from continuing operations before income taxes
(169
)
 
731

 
(275
)
 
(1
)
 
286

(Loss)/income from continuing operations
(170
)
 
731

 
(277
)
 
(1
)
 
283

Income from discontinued operations, net of tax
—

 
—

 
401

 
—

 
401

Net (loss)/income
(170
)
 
731

 
124

 
(1
)
 
684

Net (loss)/income attributable to NRG Energy, Inc. common stockholders
$
(171
)
 
$
731

 
$
124

 
$
(1
)
 
$
683

(a) Includes intersegment revenues and costs associated with our internal transfer of power, which is based on average annualized market prices and results in higher revenues in Generation and higher cost of operations in Retail that are eliminated in consolidation
(b) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
5

 
$
862

 
$
48

 
$
—

 
$
915

 
Six months ended June 30, 2018 (a)
 
Retail
 
Generation
 
Corporate
 
Eliminations
 
Total
 
 
 
 
 
 
 
 
 
 
Operating revenues(b)
$
3,294

 
$
1,438

 
$
—

 
$
(206
)
 
$
4,526

Depreciation and amortization
56

 
160

 
18

 
(2
)
 
232

Impairment losses
—

 
74

 
—

 
—

 
74

Reorganization costs
5

 
6

 
32

 
—

 
43

Gain on sale of assets
—

 
2

 
14

 
—

 
16

Equity in earnings of unconsolidated affiliates
—

 
7

 
1

 
(2
)
 
6

Income/(loss) from continuing operations before income taxes
860

 
(319
)
 
(264
)
 
(1
)
 
276

Income/(loss) from continuing operations
860

 
(319
)
 
(275
)
 
(1
)
 
265

Income from discontinued operations, net of tax
—

 
—

 
64

 
—

 
64

Net income/(loss)
860

 
(319
)
 
(211
)
 
(1
)
 
329

Net income/(loss) attributable to NRG Energy, Inc. common stockholders
$
859

 
$
(313
)
 
$
(196
)
 
$
1

 
$
351

(a) Includes intersegment revenues and costs associated with our internal transfer of power, which is based on average annualized market prices and results in higher revenues in Generation and higher cost of operations in Retail that are eliminated in consolidation
(b) Operating revenues include inter-segment sales and net derivative gains and losses of:
$
6

 
$
205

 
$
(5
)
 
$
—

 
$
206