Debt and Finance Lease Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Feb. 28, 2022	Dec. 31, 2021	Nov. 30, 2021	Sep. 30, 2020
Debt and Finance Lease Obligations:
Net unamortized debt issuance costs and other	$ (84)				$ (86)
Total debt	9,241				11,950
Finance lease obligations (see Note 4)	2,394				1,920
Total debt and finance lease obligations	11,635				13,870
Less: Current portion	1,109				1,264
Debt and finance lease obligations, less current portion	10,526				12,606
Other Debt [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	19				26
Valero Revolver [Member] | Credit Facilities [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	0				0
Canadian Revolver [Member] | Credit Facilities [Member]
Short-term Debt [Abstract]
Short-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	100				100
DGD Loan Agreement [Member] | Credit Facilities [Member]
Short-term Debt [Abstract]
Short-term debt at stated values	25				25
IEnova Revolver [Member] | Credit Facilities [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	717				679
1.200% Valero Senior Notes Due in 2024 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 167				$ 169
Interest rate of notes (percent)	1.20%				1.20%		1.20%
2.850% Valero Senior Notes Due in 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 251				$ 1,050
Interest rate of notes (percent)	2.85%	2.85%		2.85%
3.65% Valero Senior Notes Due in 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 189				$ 324
Interest rate of notes (percent)	3.65%	3.65%		3.65%	3.65%
3.400% Valero Senior Notes Due in 2026 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 426				$ 1,250
Interest rate of notes (percent)	3.40%	3.40%		3.40%
2.150% Valero Senior Notes Due in 2027 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 578				600
Interest rate of notes (percent)	2.15%						2.15%
4.350% Valero Senior Notes Due in 2028 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 606				750
Interest rate of notes (percent)	4.35%	4.35%
4.000% Valero Senior Notes Due in 2029 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 439				1,000
Interest rate of notes (percent)	4.00%	4.00%
8.75% Valero Senior Notes Due in 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 in 2031 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 472				500
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	$ 733				750
Interest rate of notes (percent)	7.50%
6.625% Valero Senior Notes Due in 2037 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 1,442				1,500
Interest rate of notes (percent)	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 in 2039 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 113				$ 113
Interest rate of notes (percent)	10.50%				10.50%
4.90% Valero Senior Notes Due in 2045 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 626				$ 650
Interest rate of notes (percent)	4.90%
3.650% Valero Senior Notes Due in 2051 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 855				950
Interest rate of notes (percent)	3.65%					3.65%
4.000% Valero Senior Notes Due in 2052 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 553				0
Interest rate of notes (percent)	4.00%			4.00%
7.45% Valero Senior Notes Due in 2097 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 70				100
Interest rate of notes (percent)	7.45%
4.375% VLP Senior Notes Due in 2026 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 146				$ 376
Interest rate of notes (percent)	4.375%	4.375%		4.375%	4.375%
4.500% VLP Senior Notes Due in 2028 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 474				$ 500
Interest rate of notes (percent)	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%
Gulf Opportunity Zone Revenue Bonds, Series 2010, 4.00% Due in 2040 [Member] | Revenue Bonds [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 0				$ 300
Interest rate of notes (percent)	4.00%		4.00%