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Segment Reporting
12 Months Ended
Dec. 31, 2019
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
As of December 31, 2019, the Company's reportable segments were Generation, Retail and Corporate. Retail included Mass market and C&I customers, as well as other distributed and reliability products. Generation included all power plant activities, as well as renewables. The Company began managing its integrated model 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 to Texas, East and West/Other beginning in the first quarter of 2020. The Company's updated segment structure reflects how management currently makes financial decisions and allocates resources. All affected disclosures presented herein have been recast to reflect these changes for all periods presented. For further discussion, refer to Note 1, Nature of Business.
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.
On February 4, 2019, the Company completed the sale and deconsolidation of South Central Portfolio. On August 31, 2018, NRG deconsolidated NRG Yield Inc., its Renewables Platform and Carlsbad for financial reporting purposes. In 2018, the financial information for historical periods was recast to reflect the presentation of discontinued operations within the corporate segment. Refer to Note 4, Acquisitions, Discontinued Operations and Dispositions, for further discussion.
The Company had no customer that comprised more than 10% of the Company's consolidated revenues during the years ended December 31, 2019 and 2017. The company had one customer in the Texas segment that comprised 11% of the Company's consolidated revenues during the year ended December 31, 2018.
Intersegment sales are accounted for at market.
 For the Year Ended December 31, 2019
(In millions)TexasEastWest/Other
Corporate(a)
Eliminations
Total
Operating revenues(a)
$7,069  $2,319  $440  $—  $(7) $9,821  
Operating expenses5,818  1,895  397  50  (7) 8,153  
Depreciation and amortization188  121  33  31  —  373  
Impairment losses —   —  —   
Development costs   —  —   
Total operating cost and expenses6,010  2,019  435  81  (7) 8,538  
Gain on sale of assets—   —   —   
Operating income/(loss)1,059  301   (75) —  1,290  
Equity in (losses)/earnings of unconsolidated affiliates(4) —   —  —   
Impairment losses on investments(103) —  —  (5) —  (108) 
Other income, net 20   10  30  —  66  
Loss on debt extinguishment—  —  (3) (48) —  (51) 
Interest expense—  (18) (10) (385) —  (413) 
Income/(loss) from continuing operations before income taxes972  289   (483) —  786  
Income tax expense/(benefit)—    (3,337) —  (3,334) 
Net income from continuing operations972  287   2,854  —  4,120  
Gain from discontinued operations, net of income tax—  —  —  321  —  321  
Net Income972  287   3,175  —  4,441  
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests—  —   —  —   
Net income attributable to NRG Energy, Inc.$972  $287  $ $3,175  $—  $4,438  
Balance sheet  
Equity investments in affiliates$ $—  $382  $—  $—  $388  
Capital expenditures136  30  25  37  —  228  
Goodwill(b)
325  254  —  —  —  579  
Total assets$5,711  $2,160  $1,190  $8,342  $(4,872) $12,531  

(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$ $ $(2) $—  $—  $ 
(b) Goodwill was allocated based on the regions in which the business operates and are expected to benefit using a relative fair value approach
 For the Year Ended December 31, 2018
(In millions)TexasEastWest/Other
Corporate(a)
Eliminations Total
Operating revenues(a)
$6,401  $2,371  $724  $—  $(18) $9,478  
Operating expenses5,399  2,024  467  125  (18) 7,997  
Depreciation and amortization156  105  127  33  —  421  
Impairment losses 82  12  —  —  99  
Development costs    —  11  
Total operating cost and expenses5,563  2,214  609  160  (18) 8,528  
Gain on sale of assets —  (2) 30  —  32  
Operating income/(loss)
842  157  113  (130) —  982  
Equity in (losses)/earnings of unconsolidated affiliates(3) —  13  (1) —   
Impairment losses on investments(15) —  —  —  —  (15) 
Other income/(loss), net13    (1) —  18  
Loss on debt extinguishment—  —  —  (44) —  (44) 
Interest expense—  (22) (39) (422) —  (483) 
Income/(loss) from continuing operations before income taxes837  137  91  (598) —  467  
Income tax expense—   —   —   
Net income/(loss) from continuing operations
837  136  91  (604) —  460  
Loss from discontinued operations, net of income tax—  —  —  (192) —  (192) 
Net Income/(loss)837  136  91  (796) —  268  
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests—  —   (5) —  —  
Net income/(loss) attributable to NRG Energy, Inc.
$837  $136  $86  $(791) $—  $268  
Balance sheet      
Equity investments in affiliates$ $—  406$—  $—  $412  
Capital expenditures143  171  29  45  —  388  
Goodwill(b)
320  253  —  —  —  573  
Total assets$5,357  $2,187  $1,548  $6,631  $(5,095) $10,628  

(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$19  $(5) 4$—  $—  $18  
(b) Goodwill was allocated based on the regions in which the business operates and are expected to benefit using a relative fair value approach
 For the Year Ended December 31, 2017
(In millions)TexasEastWest/Other
Corporate(a)
Eliminations Total
Operating revenues(a)
$6,318  $2,009  $788  $ $(47) $9,074  
Operating expenses5,393  1,684  498  239  (48) 7,766  
Depreciation and amortization
258  112  194  35  (3) 596  
Impairment losses
1,317  106  111  —  —  1,534  
Development costs
    —  22  
Total operating costs and expenses
6,972  1,908  809  280  (51) 9,918  
Other income - affiliate
—  —  —  87  —  87  
Gain/(loss) on sale of assets
 15  (5)  —  16  
Operating (loss)/income
(649) 116  (26) (186)  (741) 
Equity in (losses)/earnings of unconsolidated affiliates
(22) —  10  (2) —  (14) 
Impairment losses on investments
(69) —  (6) (4) —  (79) 
Other (expense)/income, net
(2)  22  27  —  51  
Loss on debt extinguishment
—  —  —  (49) —  (49) 
Interest expense
—  (29) (77) (451) —  (557) 
(Loss)/income from continuing operations before income taxes(742) 91  (77) (665)  (1,389) 
Income tax benefit
—  —  (6) (38) —  (44) 
Net (loss)/income from continuing operations
(742) 91  (71) (627)  (1,345) 
Loss from discontinued operations, net of income tax—  —  —  (992) —  (992) 
Net (loss)/income
(742) 91  (71) (1,619)  (2,337) 
Less: Net income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests
—  —   (189)  (184) 
Net (loss)/income attributable to NRG Energy, Inc.
$(742) $91  $(72) $(1,430) $—  $(2,153) 

(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$41  $ (4) $ $—  $47