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Segment Reporting
 9 Months Ended
Sep. 30, 2023
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. The acquired operations from the Vivint Smart Home acquisition are reported within the Vivint Smart Home segment.
NRG’s chief operating decision maker, its chief executive officer, evaluates the performance of the Company's 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 accounting policies of the segments are the same as those applied in the consolidated financial statements as disclosed in Note 2, Summary of Significant Accounting Policies, to the Company’s 2022 Form 10-K.

Three months ended September 30, 2023
(In millions)TexasEastWest/Services/OtherVivint Smart HomeCorporateEliminationsTotal
Revenue
$3,686 $2,809 $978 $478 $— $(5)$7,946 
Depreciation and amortization
71 27 23 178 9 — 308 
Equity in earnings of unconsolidated affiliates
— — 6 — — — 6 
Income/(loss) before income taxes463 314 (205)(24)(140)— 408 
Net income/(loss) $463 $316 $(168)$(4)$(264)$— $343 
Three months ended September 30, 2022
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Revenue
$3,145 $4,178 $1,175 $— $12 $8,510 
Depreciation and amortization
79 37 22 7 — 145 
Impairment losses
— 43 — — — 43 
Gain on sale of assets22 — — — — 22 
Equity in (losses)/earnings of unconsolidated affiliates
(1)— 12 — — 11 
(Loss)/income before income taxes(481)557 110 (103)— 83 
Net (loss)/income$(481)$557 $92 $(101)$— $67 
Nine months ended September 30, 2023
(In millions)TexasEastWest/Services/Other
Vivint Smart Home(a)
CorporateEliminationsTotal
Revenue$8,235 $9,488 $3,244 $1,070 $— $(21)$22,016 
Depreciation and amortization219 87 70 410 27 — 813 
Gain on sale of assets
— 202 — — — — 202 
Equity in earnings of unconsolidated affiliates— — 16 — — — 16 
Income/(loss) before income taxes1,532 (1,188)(684)(86)(440)— (866)
Net income/(loss) $1,532 $(1,187)$(601)$(66)$(362)$— $(684)
(a)Includes results of operations following the acquisition date of March 10, 2023
Nine months ended September 30, 2022
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Revenue$7,857 $12,407 $3,395 $— $29 $23,688 
Depreciation and amortization233 164 65 23 — 485 
Impairment losses— 198 — — — 198 
Gain/(loss) on sale of assets10 — 43 (2)— 51 
Equity in (losses)/earnings of unconsolidated affiliates(2)— 2 — — — 
Income/(loss) before income taxes1,052 2,082 274 (353)— 3,055 
Net income/(loss)$1,052 $2,083 $246 $(1,065)$— $2,316