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Segment Reporting
 3 Months Ended
Mar. 31, 2022
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).
Three months ended March 31, 2022
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Revenue
$2,023 $4,718 $1,138 $— $17 $7,896 
Depreciation and amortization
76 78 21 8 — 183 
Loss on sale of assets
— — (1)(2)— (3)
Equity in (losses) of unconsolidated affiliates
(1)— (14)— — (15)
Income/(loss) before income taxes
773 1,541 124 (131)— 2,307 
Net income/(loss) $773 $1,541 $125 $(703)$— $1,736 
Three months ended March 31, 2021
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Revenue
$3,702 $3,495 $895 $— $(1)$8,091 
Depreciation and amortization
77 206 27 7 — 317 
Gain on sale of assets— — 17 — — 17 
Equity in (losses) of unconsolidated affiliates
(1)— (5)— — (6)
(Loss)/income before income taxes
(433)356 79 (169)— (167)
Net (loss)/income
$(433)$356 $74 $(79)$— $(82)