Debt and Finance Lease Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Feb. 28, 2023	Dec. 31, 2022	Sep. 30, 2022	Feb. 28, 2022
Debt and Finance Lease Obligations:
Net unamortized debt issuance costs and other	$ (71)		$ (77)
Total debt	8,085		9,218
Finance lease obligations (see Note 5)	2,378		2,306
Total debt and finance lease obligations	10,463		11,524
Less: Current portion	743		1,406
Debt and finance lease obligations, less current portion	9,720		10,118
Other Debt [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	0		14
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		250
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	58		766
1.200% Valero Senior Notes Due 2024 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 0		167
Interest rate of notes (percent)	1.20%	1.20%
2.850% Valero Senior Notes Due 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 251		251
Interest rate of notes (percent)	2.85%					2.85%	2.85%
3.65% Valero Senior Notes Due 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 189		189
Interest rate of notes (percent)	3.65%					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%					3.40%	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%				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%					4.35%
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%					4.00%
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%				2.80%
7.5% Valero Senior Notes Due in 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%	6.625%
6.75% Valero Senior Notes Due in 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%				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%	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%	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%				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%					4.375%	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%				4.50%
Debenture, 7.65% Due In 2026 [Member] | Debenture [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 100		$ 100
Interest rate of notes (percent)	7.65%