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Segment Reporting
 6 Months Ended
Jun. 30, 2020
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
As part of perfecting the integrated model, in which the majority of the Company’s generation serves its retail customers, the Company began managing its operations based on the combined results of the retail and wholesale generation businesses with a geographical focus in 2020. As a result, the Company changed its business segments from Retail and Generation to Texas, East and West/Other beginning in the first quarter of 2020, as further described in Note 1, Nature of Business. The Company's updated segment structure reflects how management currently makes financial decisions and allocates resources The financial information for the three and six months ended June 30, 2019 was recast to reflect the current segment structure.
In February 2019, as described in Note 4, Acquisitions, Discontinued Operations and Dispositions, the Company completed the sales of the South Central Portfolio and Carlsbad. The financial information for the three and six months ended June 30, 2019 presented below reflects 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 allocation of capital, as well as net income/(loss).
Three months ended June 30, 2020
(In millions)TexasEastWest/OtherCorporateEliminationsTotal
Operating revenues
$1,578  $566  $94  $—  $—  $2,238  
Depreciation and amortization
59  33  8  10  —  110  
Equity in (losses)/earnings of unconsolidated affiliates
(3) —  15  —  —  12  
Income/(loss) from continuing operations before income taxes350  146  26  (109) 1  414  
Income/(loss) from continuing operations350  146  25  (209) 1  313  
Net income/(loss) attributable to NRG Energy, Inc$350  $146  $25  $(209) $1  $313  

Three months ended June 30, 2019
(In millions)TexasEastWest/OtherCorporateEliminationsTotal
Operating revenues
$1,837  $524  $106  $1  $(3) $2,465  
Depreciation and amortization
40  30  7  8  —  85  
Impairment losses
1  —  —  —  —  1  
Reorganization costs
3  —  —  (1) —  2  
Gain on sale of assets—  —  —  1  —  1  
Equity in (losses)/earnings of unconsolidated affiliates
(3) —  3  —  —  —  
Loss on debt extinguishment, net
—  —  —  (47) —  (47) 
Income/(loss) from continuing operations before income taxes
259  60  18  (149) —  188  
Income/(loss) from continuing operations 259  60  18  (148) —  189  
Income from discontinued operations, net of tax
—  —  —  13  —  13  
Net income/(loss)
259  60  18  (135) —  202  
Net income/(loss) attributable to NRG Energy, Inc.
$259  $60  $17  $(135) $—  $201  


Six months ended June 30, 2020
(In millions)TexasEastWest/OtherCorporateEliminationsTotal
Operating revenues$2,936  $1,105  $219  $—  $(3) $4,257  
Depreciation and amortization118  66  16  19  —  219  
Reorganization costs1  —  —  2  —  3  
Gain on sale of assets—  —  1  5  —  6  
Equity in (losses)/earnings of unconsolidated affiliates(3) —  4  —  —  1  
Impairment losses on investments(18) —  —  —  —  (18) 
Loss on debt extinguishment, net—  (1) —  —  —  (1) 
Income/(loss) from continuing operations before income taxes512  170  67  (191) —  558  
Income/(loss) from continuing operations512  170  66  (314) —  434  
Net income/(loss) attributable to NRG Energy, Inc$512  $170  $66  $(314) $—  $434  
Six months ended June 30, 2019
(In millions)TexasEastWest/OtherCorporateEliminationsTotal
Operating revenues$3,303  $1,133  $199  $—  $(5) $4,630  
Depreciation and amortization80  56  18  16  —  170  
Impairment losses1  —  —  —  —  1  
Reorganization costs4  —  —  11  —  15  
Gain on sale of assets—  1  —  1  —  2  
Equity in (losses) of unconsolidated affiliates(6) —  (15) —  —  (21) 
Loss on debt extinguishment, net—  —  —  (47) —  (47) 
Income/(loss) from continuing operations before income taxes409  159  (5) (276) (1) 286  
Income/(loss) from continuing operations409  159  (5) (279) (1) 283  
Income from discontinued operations, net of tax—  —  —  401  —  401  
Net income/(loss)409  159  (5) 122  (1) 684  
Net income/(loss) attributable to NRG Energy, Inc.$409  $159  $(6) $122  $(1) $683