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Segment Reporting
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
The Company’s segment structure reflects how management makes financial decisions and allocates resources. The Company manages its operations based on the combined results of the retail and wholesale generation businesses with a geographical focus.
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.
The acquired operations of Direct Energy are integrated into the existing NRG segment structure. Domestic customer and market operations are combined into the corresponding geographical segments of Texas, East and West/Services/Other. The West/Services/Other segment includes activity related to the Canadian operations as well as the services businesses.
In February 2019, the Company completed the sale and deconsolidation of the South Central Portfolio and Carlsbad. 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, 2021, 2020 and 2019.
Intersegment sales are accounted for at market.
For the Year Ended December 31, 2021
(In millions)TexasEastWest/Services/Other
Corporate(a)
Eliminations
Total
Operating revenues(a)
$10,293 $13,033 $3,653 $— $10 $26,989 
Operating expenses8,692 10,257 3,466 141 10 22,566 
Depreciation and amortization331 338 88 28 — 785 
Impairment losses— 535 9 — — 544 
Total operating cost and expenses9,023 11,130 3,563 169 10 23,895 
Gain on sale of assets19 — 17 211 — 247 
Operating income1,289 1,903 107 42 — 3,341 
Equity in (losses)/earnings of unconsolidated affiliates(3)— 20 — — 17 
Other income, net8 7 3 59 (14)63 
Loss on debt extinguishment— — — (77)— (77)
Interest expense(1)(1)(28)(469)14 (485)
Income/(loss) from continuing operations before income taxes1,293 1,909 102 (445)— 2,859 
Income tax expense— — 19 653 — 672 
Net income/(loss) attributable to NRG Energy, Inc.$1,293 $1,909 $83 $(1,098)$— $2,187 
Balance sheet
Equity investments in affiliates$— $— $157 $— $— $157 
Capital expenditures153 50 21 45 — 269 
Goodwill751 853 191 — — 1,795 
Total assets$12,265 $13,673 $4,816 $19,081 $(26,653)$23,182 
(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$5 $(18)$3 $— $— $(10)
 For the Year Ended December 31, 2020
(In millions)TexasEastWest/Services/Other
Corporate(a)
Eliminations
Total
Operating revenues(a)
$6,309 $2,258 $530 $— $(4)$9,093 
Operating expenses5,249 1,758 421 57 (4)7,481 
Depreciation and amortization227 138 36 34 — 435 
Impairment losses14 — 61 — — 75 
Total operating cost and expenses5,490 1,896 518 91 (4)7,991 
(Loss)/gain on sale of assets— — (2)5 — 3 
Operating income/(loss)819 362 10 (86)— 1,105 
Equity in (losses)/earnings of unconsolidated affiliates(12)— 29 — — 17 
Impairment losses on investments(18)— — — — (18)
Other income, net 11 7 8 41 — 67 
Loss on debt extinguishment— (4)(5)— — (9)
Interest expense— (14)(3)(384)— (401)
Income/(loss) from continuing operations before income taxes800 351 39 (429)— 761 
Income tax (benefit)/expense— (1)2 250 — 251 
Net income attributable to NRG Energy, Inc.$800 $352 $37 $(679)$— $510 
Balance sheet
Equity investments in affiliates$(13)$— $359 $— $— $346 
Capital expenditures130 45 30 25 — 230 
Goodwill(b)
324 240 15 — — 579 
Total assets$7,641 $1,790 $1,679 $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/Services/Other
Corporate(a)
Eliminations Total
Operating revenues(a)
$7,069 $2,262 $497 $— $(7)$9,821 
Operating expenses5,821 1,843 453 50 (7)8,160 
Depreciation and amortization188 117 37 31 — 373 
Impairment losses1 — 4 — — 5 
Total operating cost and expenses6,010 1,960 494 81 (7)8,538 
Gain on sale of assets— 1 — 6 — 7 
Operating income/(loss)
1,059 303 3 (75)— 1,290 
Equity in (losses)/earnings of unconsolidated affiliates(4)— 6 — — 2 
Impairment losses on investments(103)— — (5)— (108)
Other income, net20 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 291 6 (483)— 786 
Income tax expense/(benefit)— 2 1 (3,337)— (3,334)
Net income from continuing operations972 289 5 2,854 — 4,120 
Gain from discontinued operations, net of income tax— — — 321 — 321 
Net Income972 289 5 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 $289 $2 $3,175 $— $4,438 
(a) Inter-segment sales and inter-segment net derivative gains and losses included in operating revenues
$1 $8 $(2)$— $— $7