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Segment Information
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Segment Information SEGMENT INFORMATION
The operations of Vistra are aligned into six reportable business segments: (i) Retail, (ii) Texas, (iii) East, (iv) West, (v) Sunset and (vi) Asset Closure.

Our Chief Executive Officer is our CODM. Our CODM reviews the results of these segments separately and allocates resources to the respective segments as part of our strategic operations. A measure of assets is not applicable, as segment assets are not regularly reviewed by the CODM for evaluating performance or allocating resources.

The Retail segment is engaged in retail sales of electricity and natural gas to residential, commercial and industrial customers. Substantially all of these activities are conducted by TXU Energy, Ambit, Dynegy Energy Services, Homefield Energy and U.S. Gas & Electric across 19 states in the U.S.

The Texas and East segments are engaged in electricity generation, wholesale energy sales and purchases, commodity risk management activities, fuel production and fuel logistics management. The Texas segment represents results from Vistra's electricity generation operations in the ERCOT market, other than assets that are now part of the Sunset or Asset Closure segments. The East segment represents results from Vistra's electricity generation operations in the Eastern Interconnection of the U.S. electric grid, other than assets that are now part of the Sunset or Asset Closure segments, and includes operations in the PJM, ISO-NE and NYISO markets. We determined it was appropriate to aggregate results from these markets into one reportable segment, East, given similar economic characteristics.

The West segment represents results from the CAISO market, including our battery ESS projects at our Moss Landing power plant site (see Note 3).

The Sunset segment consists of generation plants with announced retirement dates after December 31, 2023. Separately reporting the Sunset segment differentiates operating plants with announced retirement plans from our other operating plants in the Texas, East and West segments. We have allocated unrealized gains and losses on the commodity risk management activities to the Sunset segment for the generation plants that have announced retirement dates after December 31, 2023.

The Asset Closure segment is engaged in the decommissioning and reclamation of retired plants and mines (see Note 4). The Asset Closure segment also includes results from generation plants we retired in the years ended December 31, 2023 and 2022. Upon movement of generation plant assets to either the Sunset or Asset Closure segments, prior year results are retrospectively adjusted, if the effects are material, for comparative purposes. Separately reporting the Asset Closure segment provides management with better information related to the performance and earnings power of Vistra's ongoing operations and facilitates management's focus on minimizing the cost associated with decommissioning and reclamation of retired plants and mines. We have allocated unrealized gains and losses on the commodity risk management activities attributable to the plants retired in 2022 and 2023.

Corporate and Other represents the remaining non-segment operations consisting primarily of general corporate expenses, interest, taxes and other expenses related to our support functions that provide shared services to our operating segments.

The accounting policies of the business segments are the same as those described in the summary of significant accounting policies in Note 1. Our CODM uses more than one measure to assess segment performance, but primarily focuses on Adjusted EBITDA. While we believe this is a useful metric in evaluating operating performance, it is not a metric defined by U.S. GAAP and may not be comparable to non-GAAP metrics presented by other companies. Adjusted EBITDA is most comparable to consolidated net income (loss) prepared based on U.S. GAAP. We account for intersegment sales and transfers as if the sales or transfers were to third parties, that is, at market prices. Certain shared services costs are allocated to the segments.

For the year ended		RetailTexasEastWestSunsetAsset Closure
Corporate and Other (a)
EliminationsConsolidated
Operating revenues:
December 31, 2023$10,572 $3,823 $4,215 $914 $1,831 $— $2 $(6,578)$14,779 
December 31, 20229,455 3,733 3,706 336 868 384 1 (4,755)13,728 
December 31, 20217,871 2,790 2,587 374 661 78 — (2,284)12,077 
Depreciation and amortization:
December 31, 2023$(102)$(544)$(647)$(79)$(62)$— $(68)$— $(1,502)
December 31, 2022(145)(537)(706)(42)(66)(31)(69)— (1,596)
December 31, 2021(212)(608)(698)(60)(94)(45)(36)— (1,753)
Operating income (loss):
December 31, 2023$443 $300 $1,158 $425 $639 $(111)$(193)$— $2,661 
December 31, 20221,172 (711)(867)(250)(228)(158)(135)— (1,177)
December 31, 20212,213 (2,601)(552)(8)(67)(417)(83)— (1,515)
Interest expense and related charges:
December 31, 2023$(20)$21 $— $8 $(2)$(5)$(742)$— $(740)
December 31, 2022(14)20 (3)6 (3)(3)(371)— (368)
December 31, 2021(9)14 (15)9 (3)— (381)1 (384)
Income tax (expense) benefit:
December 31, 2023$— $— $(1)$— $— $— $(507)$— $(508)
December 31, 2022— — — — — — 350 — 350 
December 31, 2021(2)— — — — — 460 — 458 
Net income (loss):
December 31, 2023$424 $354 $1,160 $454 $633 $(6)$(1,527)$— $1,492 
December 31, 20221,158 (615)(868)(238)(230)(147)(270)— (1,210)
December 31, 20212,196 (2,512)(567)1 (61)(374)53 — (1,264)
Capital expenditures, including nuclear fuel and excluding LTSA prepayments and development and growth expenditures:
December 31, 2023$1 $500 $105 $18 $69 $— $58 $— $751 
December 31, 20221 335 56 116 33 — 55 — 596 
December 31, 20211 266 44 8 28 3 48 — 398 
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(a)Income tax (expense) benefit is generally not reflected in net income (loss) of the segments but is reflected almost entirely in Corporate and Other net income (loss).