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Segment Reporting (Tables)
 3 Months Ended
Mar. 31, 2019
Segment Reporting [Abstract]  
Schedule of segment reporting information, by segment
 
Three months ended March 31, 2019(a)
 
Retail
 
Generation
 
Corporate
 
Eliminations
 
Total
 
(In millions)
Operating revenues(b)
$
1,607

 
$
823

 
$
1

 
$
(266
)
 
$
2,165

Depreciation and amortization
31

 
46

 
8

 
—

 
85

Reorganization costs
1

 
1

 
11

 
—

 
13

Equity in losses of unconsolidated affiliates
—

 
(20
)
 
27

 
(28
)
 
(21
)
Income/(loss) from continuing operations before income taxes
111

 
114

 
(100
)
 
(27
)
 
98

Income/(loss) from continuing operations
111

 
114

 
(104
)
 
(27
)
 
94

Income from discontinued operations, net of tax
—

 
—

 
388

 
—

 
388

Net Income attributable to NRG Energy, Inc.
$
111

 
$
114

 
$
284

 
$
(27
)
 
$
482

Total assets as of March 31, 2019
$
3,309

 
$
5,489

 
$
5,680

 
$
(4,948
)
 
$
9,530

 
(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:
$
3

 
$
235

 
$
28

 
$
—

 
$
266

 
Three months ended March 31, 2018(a)
 
Retail
 
Generation
 
Corporate
 
Eliminations
 
Total
 
(In millions)
Operating revenues(b)
$
1,480

 
$
270

 
$
1

 
$
314

 
$
2,065

Depreciation and amortization
26

 
86

 
9

 
(1
)
 
120

Reorganization costs
3

 
4

 
13

 
—

 
20

Equity in earnings/(losses) of unconsolidated affiliates
—

 
2

 
(1
)
 
—

 
1

Income/(loss) from continuing operations before income taxes
944

 
(573
)
 
(128
)
 
1

 
244

Income/(loss) from continuing operations
944

 
(573
)
 
(134
)
 
1

 
238

Loss from discontinued operations, net of tax
—

 
—

 
(5
)
 
—

 
(5
)
Net Income/(Loss)
944

 
(573
)
 
(139
)
 
1

 
233

Net Income/(Loss) attributable to NRG Energy, Inc.
$
943

 
$
(565
)
 
$
(100
)
 
$
1

 
$
279

 
(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:
$
1

 
$
(309
)
 
$
(6
)
 
$
—

 
$
(314
)