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Debt, Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt Instrument [Line Items]        
Amount borrowed on lines of credit     $ 498,000,000  
Senior Notes [Member] | Senior Notes Due April 1, 2029 [Member]        
Debt Instrument [Line Items]        
Face amount of long-term debt issuance   $ 1,000,000,000    
Stated rate on debt instrument (percent)   4.00%    
Proceeds from issuance of senior long-term debt   $ 992,000,000    
Senior Notes [Member] | Senior Notes Due February 1, 2020 [Member] | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Stated rate on debt instrument (percent) 6.125%      
Early repayment of senior debt $ 871,000,000      
Debt instrument, redemption price, percentage of principal amount redeemed (percent) 102.48%      
Early redemption fee $ 21,000,000      
Senior Notes [Member] | VLP Senior Notes Due December 15, 2026 [Member] | Valero Energy Partners LP [Member]        
Debt Instrument [Line Items]        
Stated rate on debt instrument (percent)   4.375%    
Senior Notes [Member] | VLP Senior Notes Due March 15, 2028 [Member] | Valero Energy Partners LP [Member]        
Debt Instrument [Line Items]        
Face amount of long-term debt issuance     $ 500,000,000  
Stated rate on debt instrument (percent)   4.50% 4.50%  
Proceeds from issuance of senior long-term debt     $ 498,000,000  
Credit Facilities [Member] | Valero Revolver [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 4,000,000,000   $ 3,000,000,000
Credit Facilities [Member] | Accounts Receivable Sales Facility [Member]        
Debt Instrument [Line Items]        
Repayments of outstanding amounts   900,000,000    
Line of credit facility, maximum borrowing capacity   1,300,000,000    
Amount of eligible receivables sold under accounts receivable sales facility   $ 900,000,000    
Variable interest rate (percent)   3.1774%   3.0618%
Credit Facilities [Member] | Valero Energy Partners LP [Member] | VLP Revolver [Member]        
Debt Instrument [Line Items]        
Repayments of outstanding amounts     410,000,000  
Line of credit facility, maximum borrowing capacity       $ 750,000,000
Credit Facilities [Member] | Central Mexico Terminals [Member] | IEnova Revolver [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity [1]   $ 340,000,000    
Variable interest rate (percent)   6.447%   6.046%
Amount borrowed on lines of credit   $ 23,000,000    
Repayments on lines of credit   $ 0    
Subordinated Debt [Member] | VLP Subordinated Notes [Member] | Valero Energy Partners LP [Member]        
Debt Instrument [Line Items]        
Repayments of notes payable-related party     $ 85,000,000  
[1] Creditors of our VIE do not have recourse against us.