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Segment Reporting
 3 Months Ended
Mar. 31, 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.
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 from the Vivint acquisition are reported within the Vivint segment.
Three months ended March 31, 2023
(In millions)TexasEastWest/Services/Other
Vivint(a)
CorporateEliminationsTotal
Revenue
$2,034 $4,176 $1,374 $148 $— $(10)$7,722 
Depreciation and amortization
75 30 24 52 9 — 190 
Gain on sale of assets
— 199 — — — — 199 
Equity in earnings of unconsolidated affiliates
— — 5 — — — 5 
Income/(loss) before income taxes284 (1,402)(351)(39)(163)— (1,671)
Net income/(loss) $284 $(1,402)$(304)$(39)$126 $— $(1,335)
(a)Vivint includes results of operations following the acquisition date of March 10, 2023
Three months ended March 31, 2022
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Revenue
$2,020 $4,715 $1,144 $— $17 $7,896 
Depreciation and amortization
77 77 21 8 — 183 
(Loss) on sale of assets— — (1)(2)— (3)
Equity in (losses) of unconsolidated affiliates
(1)— (14)— — (15)
Income/(loss) before income taxes771 1,538 129 (131)— 2,307 
Net income/(loss)$771 $1,538 $130 $(703)$— $1,736