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Segment Reporting
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
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 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.
In February 2019, the Company completed the sale and deconsolidation of the South Central Portfolio and Carlsbad. 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, 2020 and 2019. 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, 2020
(In millions)TexasEastWest/Other
Corporate(a)
Eliminations
Total
Operating revenues(a)
$6,309 $2,354 $434 $— $(4)$9,093 
Operating expenses5,246 1,828 346 57 (4)7,473 
Depreciation and amortization227 142 32 34 — 435 
Impairment losses14 — 61 — — 75 
Development costs4 3 1 — — 8 
Total operating cost and expenses5,491 1,973 440 91 (4)7,991 
(Loss)/gain on sale of assets— — (2)5 — 3 
Operating income/(loss)818 381 (8)(86)— 1,105 
Equity in (losses)/earnings of unconsolidated affiliates(12)— 29 — — 17 
Impairment losses on investments(18)— — — — (18)
Other income, net11 7 8 41 — 67 
Loss on debt extinguishment— (4)(5)— — (9)
Interest expense— (14)(3)(384)— (401)
Income/(loss) from continuing operations before income taxes799 370 21 (429)— 761 
Income tax (benefit)/expense— (1)2 250 — 251 
Net income/(loss) attributable to NRG Energy, Inc.$799 $371 $19 $(679)$— $510 
Balance sheet
Equity investments in affiliates$(13)$— $359 $— $— $346 
Capital expenditures130 45 30 25 — 230 
Goodwill(b)
325 254 — — — 579 
Total assets$7,641 $1,885 $1,584 $11,152 $(7,360)$14,902 

(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$6 $(6)$4 $— $— $4 
(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, 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 losses1 — 4 — — 5 
Development costs3 3 1 — — 7 
Total operating cost and expenses6,010 2,019 435 81 (7)8,538 
Gain on sale of assets— 1 — 6 — 7 
Operating income/(loss)1,059 301 5 (75)— 1,290 
Equity in (losses)/earnings of unconsolidated affiliates(4)— 6 — — 2 
Impairment losses on investments(103)— — (5)— (108)
Other income, net 20 6 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 8 (483)— 786 
Income tax expense/(benefit)— 2 1 (3,337)— (3,334)
Net income from continuing operations972 287 7 2,854 — 4,120 
Gain from discontinued operations, net of income tax— — — 321 — 321 
Net Income972 287 7 3,175 — 4,441 
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests— — 3 — — 3 
Net income attributable to NRG Energy, Inc.$972 $287 $4 $3,175 $— $4,438 
Balance sheet  
Equity investments in affiliates$6 $— $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
$1 $8 $(2)$— $— $7 
(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 losses5 82 12 — — 99 
Development costs3 3 3 2 — 11 
Total operating cost and expenses5,563 2,214 609 160 (18)8,528 
Gain/(loss) on sale of assets4 — (2)30 — 32 
Operating income/(loss)
842 157 113 (130)— 982 
Equity in (losses)/earnings of unconsolidated affiliates(3)— 13 (1)— 9 
Impairment losses on investments(15)— — — — (15)
Other income/(loss), net13 2 4 (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— 1 — 6 — 7 
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 (5)— — 
Net income/(loss) attributable to NRG Energy, Inc.
$837 $136 $86 $(791)$— $268 

(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