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Debt and Finance Lease Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020	Apr. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt and Finance Lease Obligations:
Net unamortized debt issuance costs and other	$ (90)			$ (88)
Total debt	13,013			8,881
Finance lease obligations (see Note 6)	1,664			791
Total debt and finance lease obligations	14,677			9,672
Less: Current portion	723			494
Debt and finance lease obligations, less current portion	13,954			9,178
Other Debt [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	31			47
Valero Revolver [Member] | Credit Facilities [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	0			0
364-day Revolving Credit Facility [Member] | Credit Facilities [Member]
Short-term Debt [Line Items]
Short-term debt at stated values	0			0
IEnova Revolver [Member] | Credit Facilities [Member]
Short-term Debt [Line Items]
Short-term debt at stated values	598			348
Canadian Revolver [Member] | Credit Facilities [Member]
Short-term Debt [Line Items]
Short-term debt at stated values	0			0
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member]
Short-term Debt [Line Items]
Short-term debt at stated values	0			100
6.625% Valero Senior Notes Due in 2037 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 1,500			1,500
Interest rate of notes (percent)	6.625%
3.4% Valero Senior Notes Due in 2026 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 1,250			1,250
Interest rate of notes (percent)	3.40%
2.85% Valero Senior Notes Due in 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 1,050			0
Interest rate of notes (percent)	2.85%
4.0% Valero Senior Notes Due in 2029 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 1,000			$ 1,000
Interest rate of notes (percent)	4.00%			4.00%
1.2% Valero Senior Notes Due in 2024 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 925			$ 0
Interest rate of notes (percent)	1.20%	1.20%
2.7% Valero Senior Notes Due in 2023 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 850			0
Interest rate of notes (percent)	2.70%		2.70%
4.35% Valero Senior Notes Due in 2028 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 750			750
Interest rate of notes (percent)	4.35%				4.35%
7.5% Valero Senior Notes Due in 2032 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 750			750
Interest rate of notes (percent)	7.50%
4.9% Valero Senior Notes Due in 2045 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 650			650
Interest rate of notes (percent)	4.90%
3.65% Valero Senior Notes Due in 2025 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 600			600
Interest rate of notes (percent)	3.65%
2.15% Valero Senior Notes Due in 2027 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 600			0
Interest rate of notes (percent)	2.15%	2.15%
Floating-Rate Valero Senior Notes at 1.3665% [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 575			0
Floating Rate interest rate of notes (percent)	1.3665%
10.5% Valero Senior Notes Due in 2039 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 250			250
Interest rate of notes (percent)	10.50%
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%
7.45% Valero Senior Notes Due in 2097 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 100			100
Interest rate of notes (percent)	7.45%
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%
4.375% VLP Senior Notes Due in 2026 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 500			500
Interest rate of notes (percent)	4.375%
4.5% VLP Senior Notes Due in 2028 [Member] | Senior Notes [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 500			500
Interest rate of notes (percent)	4.50%
Gulf Opportunity Zone Revenue Bonds Series 2010, 4.0% [Member] | Revenue Bonds [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 300			300
Interest rate of notes (percent)	4.00%
Debenture, 7.65% Due In 2026 [Member] | Debentures [Member]
Debt Instruments [Abstract]
Long-term debt at stated values	$ 100			$ 100
Interest rate of notes (percent)	7.65%

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Amount of short-term and long-term debt and lease obligation.

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