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Segment Reporting
 3 Months Ended
Mar. 31, 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 East segment includes the deregulated customer and market operations of Canada. The West/Services/Other segment includes activity related to the regulated operations in Alberta, Canada and the services businesses.
Three months ended March 31, 2021
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Operating revenues
$3,702 $3,825 $565 $— $(1)$8,091 
Depreciation and amortization
77 209 24 7 — 317 
Gain on sale of assets
— — 17 — — 17 
Equity in losses of unconsolidated affiliates
(1)— (5)— — (6)
(Loss)/income before income taxes(425)357 70 (169)— (167)
Net (loss)/income $(425)$353 $69 $(79)$— $(82)

Three months ended March 31, 2020
(In millions)TexasEastWest/Services/OtherCorporateEliminationsTotal
Operating revenues
$1,358 $521 $143 $— $(3)$2,019 
Depreciation and amortization
59 32 9 9 — 109 
Gain on sale of assets— — 1 5 — 6 
Equity in losses of unconsolidated affiliates
— — (11)— — (11)
Income/(loss) before income taxes
162 20 45 (82)(1)144 
Net income/(loss)
$162 $20 $45 $(105)$(1)$121