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Debt - Narrative (Details) - USD ($) $ in Millions			1 Months Ended							12 Months Ended			15 Months Ended	60 Months Ended	72 Months Ended
	Dec. 20, 2023	Dec. 30, 2022	Jan. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	May 31, 2022	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 19, 2023	Oct. 31, 2023	Jun. 14, 2023	Apr. 28, 2023	Mar. 31, 2023	Oct. 31, 2022	Jul. 18, 2022	Jun. 30, 2022	Apr. 29, 2022	Feb. 28, 2022	Dec. 31, 2019
Debt Instrument [Line Items]
Short-term borrowings				$ 0						$ 0	$ 650		$ 0	$ 0	$ 0
Unamortized debt premiums, discounts and issuance costs	$ 25			(115)						(115)	(72)		(115)	(115)	(115)
Debt extinguishment (gain) loss										3	1	$ (1)
Long-term debt, percentage bearing variable interest, amount																										$ 2,300
Derivative, settled and terminated notional amount																	$ 120
Gain (loss) on sale of derivatives				13
Proceeds from issuance of senior long-term debt					$ 1,750
Debt fees and expenses, recorded as interest expense										21
Repayments/repurchases of debt										33	$ 251	381
Interest Rate Swap, Swapped to Fixed, Expiration Date December 2030
Debt Instrument [Line Items]
Notional Amount				1,625						1,625			1,625	1,625	1,625					$ 750
Interest Rate Swap, Swapped To Fixed, Effective July 2026 And Expiration Date December 2030
Debt Instrument [Line Items]
Notional Amount				875						875			875	875	875
Bond Repurchase Program Authorized March 2021
Debt Instrument [Line Items]
Bond repurchase program, authorized amount									$ 1,800
Repayments/repurchases of debt									0
Bond Repurchase Program Authorized October 2022
Debt Instrument [Line Items]
Bond repurchase program, authorized amount																					$ 1,800
Repayments/repurchases of debt													0
Vistra Operations Company LLC
Debt Instrument [Line Items]
Facility Limit				7,250						7,250			7,250	7,250	7,250
Cash Borrowings				2,500						2,500			2,500	2,500	2,500
Line of Credit | Vistra Operations Company LLC
Debt Instrument [Line Items]
Facility Limit				5,675						$ 5,675			5,675	5,675	5,675
Collateral suspension provision effective date, grace period, number of days										60 days
Cash Borrowings				2,500						$ 2,500			2,500	2,500	2,500
Line of Credit | Vistra Operations Company LLC | Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit				3,175						3,175			3,175	3,175	3,175
Line of Credit | Vistra Operations Company LLC | Senior Secured Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt covenant, outstanding borrowings to outstanding commitments threshold, amount of letters of credit excluded				$ 300						$ 300			$ 300	$ 300	$ 300
Debt covenant, outstanding borrowings to outstanding commitments threshold, percent				30.00%						30.00%			30.00%	30.00%	30.00%
Debt covenant, net first lien debt to EBITDA threshold				4.25						4.25			4.25	4.25	4.25
Debt covenant, net leverage ratio threshold, collateral suspension period				5.50						5.50			5.50	5.50	5.50
Line of Credit | Vistra Operations Company LLC | Senior Secured Term Loan B-3 Facility
Debt Instrument [Line Items]
Facility Limit	$ 2,500															$ 2,493
Debt instrument, basis spread on variable rate	2.00%
Line of credit facility, interest rate at period end	7.36%
Cash Borrowings				$ 2,500						$ 2,500			$ 2,500	$ 2,500	$ 2,500
Line of Credit | Vistra Operations Company LLC | Senior Secured Term Loan B-3 Facility | One Month
Debt Instrument [Line Items]
Stated debt interest rate (percent)																			0.11%
Line of Credit | Vistra Operations Company LLC | Senior Secured Term Loan B-3 Facility | Three Months
Debt Instrument [Line Items]
Stated debt interest rate (percent)																			0.26%
Line of Credit | Vistra Operations Company LLC | Senior Secured Term Loan B-3 Facility | Six Months
Debt Instrument [Line Items]
Stated debt interest rate (percent)																			0.43%
Line of Credit | Vistra Operations Company LLC | December 2023 Credit Agreement Amendment
Debt Instrument [Line Items]
Facility Limit	$ 7
Debt instrument, basis spread on variable rate	25.00%
Debt instrument, fee amount	$ 19
Debt extinguishment (gain) loss	$ 3
Line of Credit | Vistra Operations Company LLC | Senior Secured Extended Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit				$ 3,175						$ 3,175			$ 3,175	$ 3,175	$ 3,175							$ 725		$ 2,800
Debt instrument, basis spread on variable rate										1.70%
Stated debt interest rate (percent)				1.70%						1.70%			1.70%	1.70%	1.70%
Line of credit facility, partial termination provision		$ 350
Line of credit facility, increase (decrease), net		$ 350
Debt fees and expenses, capitalized as reduction of debt										$ 8
Debt instrument, fee on undrawn amounts										0.265
Cash Borrowings				$ 0						$ 0			$ 0	$ 0	$ 0
Line of Credit | Vistra Operations Company LLC | Senior Secured Extended Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate										1.25%
Debt instrument, fee on undrawn amounts										0.175
Line of Credit | Vistra Operations Company LLC | Senior Secured Extended Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate										2.00%
Debt instrument, fee on undrawn amounts										0.350
Line of Credit | Vistra Operations Company LLC | Senior Secured Non-Extended Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit																		$ 200
Line of Credit | Vistra Operations Company LLC | Senior Secured Revolving Credit Facility Letter of Credit Sub-Facility
Debt Instrument [Line Items]
Facility Limit																		$ 3,105
Line of Credit | Vistra Operations Company LLC | Secured Term Loan A Facility
Debt Instrument [Line Items]
Debt extinguishment (gain) loss												$ (1)
Borrowings under Term Loan A								$ 250	$ 1,000
Repayment under Term Loan A							$ 1,250
Vistra Operations Senior Unsecured Notes: | 4.375% Senior Unsecured Notes, due May 15, 2029
Debt Instrument [Line Items]
Stated debt interest rate (percent)				4.375%			4.375%			4.375%			4.375%	4.375%	4.375%
Vistra Operations Senior Unsecured Notes: | 7.750% Senior Unsecured Notes, due October 15, 2031
Debt Instrument [Line Items]
Stated debt interest rate (percent)				7.75%						7.75%			7.75%	7.75%	7.75%
Proceeds from issuance of senior long-term debt				$ 350	1,100
Proceeds from debt, net of issuance costs					1,089
Vistra Operations Senior Unsecured Notes: | 7.750% Senior Unsecured Notes, due October 15, 2031 | Subsequent Event
Debt Instrument [Line Items]
Stated debt interest rate (percent)			7.75%
Vistra Operations Senior Unsecured Notes: | 5.500% Senior Unsecured Notes, due September 1, 2026
Debt Instrument [Line Items]
Stated debt interest rate (percent)				5.50%						5.50%			5.50%	5.50%	5.50%
Vistra Operations Senior Unsecured Notes: | 5.625% Senior Unsecured Notes, due February 15, 2027
Debt Instrument [Line Items]
Stated debt interest rate (percent)				5.625%						5.625%			5.625%	5.625%	5.625%
Vistra Operations Senior Unsecured Notes: | 5.000% Senior Unsecured Notes, due July 31, 2027
Debt Instrument [Line Items]
Stated debt interest rate (percent)				5.00%						5.00%			5.00%	5.00%	5.00%
Revolving Credit Facility | Vistra Operations Company LLC | Senior Secured Commodity-Linked Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit						$ 2,000											$ 1,575				$ 1,350		$ 2,250		$ 1,000
Debt instrument, basis spread on variable rate										1.70%
Debt instrument, fee on undrawn amounts										26.5
Cash Borrowings				$ 0						$ 0			$ 0	$ 0	$ 0
Revolving Credit Facility | Vistra Operations Company LLC | Senior Secured Commodity-Linked Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate										1.25%
Debt instrument, fee on undrawn amounts										17.5
Revolving Credit Facility | Vistra Operations Company LLC | Senior Secured Commodity-Linked Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate										2.00%
Debt instrument, fee on undrawn amounts										35.0
Debt covenant, outstanding borrowings to outstanding commitments threshold, percent				30.00%						30.00%			30.00%	30.00%	30.00%
Debt covenant, net first lien debt to EBITDA threshold				4.25						4.25			4.25	4.25	4.25
Debt covenant, net leverage ratio threshold, collateral suspension period				5.50						5.50			5.50	5.50	5.50
Line of credit facility, potential borrowing capacity, subject to ability to obtain additional commitments						3,000
Letter of Credit | Vistra Operations Company LLC | Secured Letter of Credit Facilities
Debt Instrument [Line Items]
Letters of credit outstanding, amount				$ 788						$ 788			$ 788	$ 788	$ 788
Letter of Credit | Vistra Operations Company LLC | Secured Letter of Credit Facilities | Maximum
Debt Instrument [Line Items]
Debt covenant, net first lien debt to EBITDA threshold				4.25						4.25			4.25	4.25	4.25
Debt covenant, net leverage ratio threshold, collateral suspension period				5.50						5.50			5.50	5.50	5.50
Vistra Operations Senior Secured Notes:
Debt Instrument [Line Items]
Debt fees and expenses, capitalized as reduction of debt										$ 17
Borrowings under Term Loan A														$ 5,650
Proceeds from issuance of senior long-term debt						1,500
Proceeds from debt, net of issuance costs						1,485
Vistra Operations Senior Secured Notes: | Subsequent Event
Debt Instrument [Line Items]
Debt instrument, repaid, principal			$ 759
Vistra Operations Senior Secured Notes: | 6.950% Senior Secured Notes, due October 15, 2033
Debt Instrument [Line Items]
Unamortized debt premiums, discounts and issuance costs				$ (9)						$ (9)			$ (9)	$ (9)	$ (9)
Stated debt interest rate (percent)				6.95%						6.95%			6.95%	6.95%	6.95%
Debt fees and expenses, capitalized as reduction of debt										$ 12
Proceeds from issuance of senior long-term debt				$ 400	650
Proceeds from debt, net of issuance costs										$ 360
Vistra Operations Senior Secured Notes: | 6.950% Senior Secured Notes, due October 15, 2033 | Subsequent Event
Debt Instrument [Line Items]
Stated debt interest rate (percent)			6.95%
Vistra Operations Senior Secured Notes: | 7.750% Senior Unsecured Notes, due October 15, 2031
Debt Instrument [Line Items]
Proceeds from debt, net of issuance costs				$ 412	$ 643
Vistra Operations Senior Secured Notes: | 4.875% Senior Secured Notes, due May 13, 2024
Debt Instrument [Line Items]
Stated debt interest rate (percent)				4.875%						4.875%			4.875%	4.875%	4.875%
Proceeds from issuance of senior long-term debt						400
Vistra Operations Senior Secured Notes: | 4.875% Senior Secured Notes, due May 13, 2024 | Subsequent Event
Debt Instrument [Line Items]
Stated debt interest rate (percent)			4.875%
Debt instrument, repaid, principal			$ 58
Vistra Operations Senior Secured Notes: | 5.125% Senior Secured Notes, due May 13, 2025
Debt Instrument [Line Items]
Stated debt interest rate (percent)				5.125%						5.125%			5.125%	5.125%	5.125%
Proceeds from issuance of senior long-term debt						$ 1,100
Vistra Operations Senior Secured Notes: | 5.125% Senior Secured Notes, due May 13, 2025 | Subsequent Event
Debt Instrument [Line Items]
Stated debt interest rate (percent)			5.125%
Debt instrument, repaid, principal			$ 356
Vistra Operations Senior Secured Notes: | 3.550% Senior Secured Notes, due July 15, 2024
Debt Instrument [Line Items]
Stated debt interest rate (percent)				3.55%						3.55%			3.55%	3.55%	3.55%
Vistra Operations Senior Secured Notes: | 3.550% Senior Secured Notes, due July 15, 2024 | Subsequent Event
Debt Instrument [Line Items]
Stated debt interest rate (percent)			3.55%
Debt instrument, repaid, principal			$ 345
Vistra Operations Senior Secured Notes: | 3.700% Senior Secured Notes, due January 30, 2027
Debt Instrument [Line Items]
Stated debt interest rate (percent)				3.70%						3.70%			3.70%	3.70%	3.70%
Vistra Operations Senior Secured Notes: | 4.300% Senior Secured Notes, due July 15, 2029
Debt Instrument [Line Items]
Stated debt interest rate (percent)				4.30%						4.30%			4.30%	4.30%	4.30%
Vistra Operations Senior Unsecured Notes
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt															$ 6,300
Debt fees and expenses, recorded as interest expense							$ 15
Vistra Operations Senior Unsecured Notes | 4.375% Senior Unsecured Notes, due May 15, 2029
Debt Instrument [Line Items]
Proceeds from issuance of unsecured debt							$ 1,250
Vistra Operations Senior Unsecured Notes | 6.950% Senior Secured Notes, due October 15, 2033
Debt Instrument [Line Items]
Unamortized debt premiums, discounts and issuance costs				$ (7)						$ (7)			$ (7)	$ (7)	$ (7)
Debt fees and expenses, capitalized as reduction of debt										$ 17

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Nominal or face amount used to calculate payment on derivative.

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