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Segment Reporting
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
The Company’s segment structure reflects how management 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. Vivint Smart Home operations are reported within the Vivint Smart Home segment.
NRG's chief operating decision maker, its interim 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 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.
The Company had no customer that comprised more than 10% of the Company's consolidated revenues during the years ended December 31, 2023, 2022 and 2021.
Intersegment sales are accounted for at market.
For the Year Ended December 31, 2023
(In millions)TexasEastWest/Services/Other
Vivint Smart Home(a)
Corporate(b)
Eliminations
Total
Revenue(b)
$10,476 $12,547 $4,281 $1,549 $— $(30)$28,823 
Operating expenses8,407 14,412 5,025 917 133 (30)28,864 
Depreciation and amortization294 116 95 586 36 — 1,127 
Impairment losses2 4 20 — — — 26 
Total operating cost and expenses8,703 14,532 5,140 1,503 169 (30)30,017 
Gain on sale of assets1,319 259 — — — — 1,578 
Operating income/(loss)3,092 (1,726)(859)46 (169)— 384 
Equity in earnings of unconsolidated affiliates— — 16 — — — 16 
Impairment losses on investments— — (102)— — — (102)
Other income, net2 11 6 (12)56 (16)47 
Gain on debt extinguishment— — — — 109 — 109 
Interest expense(3)(3)(31)(177)(469)16 (667)
Income/(loss) before income taxes3,091 (1,718)(970)(143)(473)— (213)
Income tax (benefit)/expense(c)
— — (111)(32)132 — (11)
Net income/(loss) $3,091 $(1,718)$(859)$(111)$(605)$— $(202)
Balance sheet
Equity investments in affiliates$— $— $42 $— $— $— $42 
Capital expenditures495 5 27 18 53 — 598 
Goodwill643 721 221 3,494 — — 5,079 
Total assets$8,236 $13,712 $3,626 $7,043 $19,919 $(26,498)$26,038 
(a) Includes results of operations following the acquisition date of March 10, 2023
(b) Inter-segment sales and inter-segment net derivative gains and losses included in revenues
$5 $9 $16 $— $— $— $30 
(c) Consolidated domestic federal and state income taxes are recorded to the Corporate segment, except for Vivint Smart Home which is recorded directly to the Vivint Smart Home segment. West/Services/Other amounts represent foreign income taxes
 For the Year Ended December 31, 2022
(In millions)TexasEastWest/Services/Other
Corporate(a)
Eliminations
Total
Revenue(a)
$10,057 $16,763 $4,706 $— $17 $31,543 
Operating expenses8,495 16,031 4,108 86 17 28,737 
Depreciation and amortization310 208 85 31 — 634 
Impairment losses— 206 — — — 206 
Total operating cost and expenses8,805 16,445 4,193 117 17 29,577 
Gain/(loss) on sale of assets10 — 45 (3)— 52 
Operating income/(loss)1,262 318 558 (120)— 2,018 
Equity in (losses)/earnings of unconsolidated affiliates(2)— 8 — — 6 
Other income, net 5 10 3 54 (16)56 
Interest expense— (1)(32)(400)16 (417)
Income/(loss) before income taxes1,265 327 537 (466)— 1,663 
Income tax expense(b)
— 1 57 384 — 442 
Net income/(loss) $1,265 $326 $480 $(850)$— $1,221 
Balance sheet
Equity investments in affiliates$— $— $133 $— $— $133 
Capital expenditures273 7 37 50 — 367 
Goodwill710 723 217 — — 1,650 
Total assets$11,475 $19,526 $8,139 $35,780 $(45,774)$29,146 
(a) Inter-segment sales and inter-segment net derivative gains and losses included in revenues
$4 $(26)$5 $— $— $(17)
(b) Consolidated domestic federal and state income taxes are recorded to the Corporate segment. West/Services/Other amounts represent foreign income taxes
 For the Year Ended December 31, 2021
(In millions)TexasEastWest/Services/Other
Corporate(a)
Eliminations Total
Revenue(a)
$10,295 $13,025 $3,659 $— $10 $26,989 
Operating expenses8,692 10,256 3,467 141 10 22,566 
Depreciation and amortization336 333 88 28 — 785 
Impairment losses— 535 9 — — 544 
Total operating cost and expenses9,028 11,124 3,564 169 10 23,895 
Gain on sale of assets19 — 17 211 — 247 
Operating income1,286 1,901 112 42 — 3,341 
Equity in (losses)/earnings of unconsolidated affiliates(3)— 20 — — 17 
Other income, net8 7 3 59 (14)63 
Loss on debt extinguishment— — — (77)— (77)
Interest expense(1)(1)(28)(469)14 (485)
Income/(loss) before income taxes1,290 1,907 107 (445)— 2,859 
Income tax expense(b)
— — 19 653 — 672 
Net income/(loss)$1,290 $1,907 $88 $(1,098)$— $2,187 
(a) Inter-segment sales and inter-segment net derivative gains and losses included in revenues
$5 $(18)$3 $— $— $(10)
(b) Consolidated domestic federal and state income taxes are recorded to the Corporate segment. West/Services/Other amounts represent foreign income taxes