Debt and Finance Lease Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2025	Apr. 15, 2025	Mar. 15, 2025	Feb. 07, 2025	Dec. 31, 2024	Feb. 28, 2023
Debt and Finance Lease Obligations:
Net unamortized debt issuance costs and other	$ (70)				$ (71)
Total debt	8,261				8,085
Finance lease obligations (see Note 5)	2,358				2,378
Total debt and finance lease obligations	10,619				10,463
Less: Current portion	949				743
Debt and finance lease obligations, less current portion	9,670				9,720
Valero Revolver [Member] | Credit Facilities [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	0				0
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member]
Short-term Debt [Abstract]
Short-term debt at stated values	0				0
DGD Revolver [Member] | Credit Facilities [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	0				0
DGD Loan Agreement [Member] | Credit Facilities [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	0				0
IEnova Revolver [Member] | Credit Facilities [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	23				58
2.850% Valero Senior Notes Due 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 0				251
Interest rate of notes (percent)	2.85%	2.85%
3.65% Valero Senior Notes Due 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 0				189
Interest rate of notes (percent)	3.65%		3.65%
3.400% Valero Senior Notes Due 2026 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 426				426
Interest rate of notes (percent)	3.40%
2.150% Valero Senior Notes Due 2027 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 564				564
Interest rate of notes (percent)	2.15%
4.350% Valero Senior Notes Due 2028 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 591				591
Interest rate of notes (percent)	4.35%
4.000% Valero Senior Notes Due 2029 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 439				439
Interest rate of notes (percent)	4.00%
5.150% Valero Senior Notes Due 2030 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 650				0
Interest rate of notes (percent)	5.15%			5.15%
8.75% Valero Senior Notes Due 2030 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 200				200
Interest rate of notes (percent)	8.75%
2.800% Valero Senior Notes Due 2031 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 462				462
Interest rate of notes (percent)	2.80%
7.5% Valero Senior Notes Due 2032 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 729				729
Interest rate of notes (percent)	7.50%
6.625% Valero Senior Notes Due 2037 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 1,380				1,380
Interest rate of notes (percent)	6.625%					6.625%
6.75% Valero Senior Notes Due 2037 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 24				24
Interest rate of notes (percent)	6.75%
10.500% Valero Senior Notes Due 2039 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 113				113
Interest rate of notes (percent)	10.50%
4.90% Valero Senior Notes Due 2045 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 621				621
Interest rate of notes (percent)	4.90%
3.650% Valero Senior Notes Due 2051 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 829				829
Interest rate of notes (percent)	3.65%					3.65%
4.000% Valero Senior Notes Due 2052 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 508				508
Interest rate of notes (percent)	4.00%					4.00%
7.45% Valero Senior Notes Due 2097 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 70				70
Interest rate of notes (percent)	7.45%
4.375% VLP Senior Notes Due 2026 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 146				146
Interest rate of notes (percent)	4.375%
4.500% VLP Senior Notes Due 2028 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 456				456
Interest rate of notes (percent)	4.50%
Debenture, 7.65% Due 2026 [Member] | Debenture [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 100				$ 100
Interest rate of notes (percent)	7.65%