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Segment Reporting
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
The Company’s segment structure reflects how management currently 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 allocation of capital, as well as net income/(loss).
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.
Three months ended September 30, 2021
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Operating revenues
$2,635 $3,077 $884 $— $13 $6,609 
Depreciation and amortization
84 88 20 7 — 199 
Equity in earnings of unconsolidated affiliates
(2)— 17 — — 15 
Income/(loss) before income taxes251 1,989 131 (208)— 2,163 
Net income/(loss) $251 $1,976 $130 $(739)$— $1,618 
Total assets as of September 30, 2021
$9,929 $19,940 $4,655 $10,507 $(17,066)$27,965 
Three months ended September 30, 2020
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Operating revenues
$1,992 $666 $149 $— $2 $2,809 
Depreciation and amortization
49 33 10 7 — 99 
Impairment losses
— — 29 — — 29 
Equity in losses of unconsolidated affiliates
— — 36 — — 36 
Income/(loss) before income taxes
287 146 23 (115)— 341 
Net income/(loss)
$287 $145 $23 $(206)$— $249 
Nine months ended September 30, 2021
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Operating revenues$8,362 $9,002 $2,564 $— $15 $19,943 
Depreciation and amortization245 238 65 21 — 569 
Impairment losses— 306 — — — 306 
Gain on sale of assets— — 17 — — 17 
Equity in (losses)/earnings of unconsolidated affiliates(3)— 26 — — 23 
Income/(loss) before income taxes600 3,136 254 (536)— 3,454 
Net income/(loss) $600 $3,107 $251 $(1,344)$— $2,614 
Nine months ended September 30, 2020
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Operating revenues$4,928 $1,732 $407 $— $(1)$7,066 
Depreciation and amortization167 97 28 26 — 318 
Impairment losses— — 29 — — 29 
Gain on sale of assets— — 1 5 — 6 
Equity in (losses)/earnings of unconsolidated affiliates(3)— 40 — — 37 
Income/(loss) before income taxes799 308 98 (306)— 899 
Net income/(loss)$799 $307 $97 $(520)$— $683