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Debt, Narrative (Details) - USD ($)
 1 Months Ended 9 Months Ended
Apr. 13, 2020
Sep. 30, 2020
Apr. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
364-Day Revolving Credit Facility [Member] | Credit Facilities [Member]                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity $ 875,000,000 $ 875,000,000   $ 875,000,000        
Line of credit facility, term 364 days              
Accounts Receivable Sales Facility [Member] | Credit Facilities [Member]                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   1,000,000,000 [1]   1,000,000,000 [1]   $ 1,000,000,000.0 $ 1,300,000,000  
Amount of eligible receivables sold under accounts receivable sales facility       300,000,000 $ 900,000,000      
Repayments on lines of credit       400,000,000 900,000,000      
Interest rate at period end (percent)               2.387%
Central Mexico Terminals [Member] | IEnova Revolver [Member] | Credit Facilities [Member]                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 660,000,000   660,000,000       $ 491,000,000
Repayments on lines of credit       $ 0 0      
Interest rate at period end (percent)   3.958%   3.958%       5.749%
Amount borrowed       $ 202,000,000 148,000,000      
Base Rate [Member] | 364-Day Revolving Credit Facility [Member] | Credit Facilities [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.15%              
Base Rate [Member] | 364-Day Revolving Credit Facility [Member] | Credit Facilities [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.70%              
Eurodollar Rate [Member] | 364-Day Revolving Credit Facility [Member] | Credit Facilities [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.15%              
Eurodollar Rate [Member] | 364-Day Revolving Credit Facility [Member] | Credit Facilities [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.70%              
Senior Notes [Member]                
Debt Instrument [Line Items]                
Proceeds from issuance of senior long-term debt   $ 2,521,000,000 $ 1,499,000,000          
Senior Notes [Member] | Floating Rate Senior Notes Due September 15, 2023 [Member]                
Debt Instrument [Line Items]                
Face amount of long-term debt issuance   $ 575,000,000   $ 575,000,000        
Applicable interest rate (percent)   1.3995%   1.3995%        
Senior Notes [Member] | Floating Rate Senior Notes Due September 15, 2023 [Member] | Three-month LIBOR [Member]                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.15%            
Senior Notes [Member] | Senior Notes Due March 15, 2024 [Member]                
Debt Instrument [Line Items]                
Face amount of long-term debt issuance   $ 925,000,000   $ 925,000,000        
Stated rate on debt instrument (percent)   1.20%   1.20%        
Senior Notes [Member] | Senior Notes Due April 15, 2025, Issued September 2020 [Member]                
Debt Instrument [Line Items]                
Face amount of long-term debt issuance   $ 400,000,000   $ 400,000,000        
Stated rate on debt instrument (percent)   2.85%   2.85%        
Senior Notes [Member] | Senior Notes Due April 15, 2025, Issued April 2020 [Member]                
Debt Instrument [Line Items]                
Face amount of long-term debt issuance     $ 650,000,000          
Stated rate on debt instrument (percent)     2.85%          
Senior Notes [Member] | Senior Notes Due September 15, 2027 [Member]                
Debt Instrument [Line Items]                
Face amount of long-term debt issuance   $ 600,000,000   $ 600,000,000        
Stated rate on debt instrument (percent)   2.15%   2.15%        
Senior Notes [Member] | Senior Notes Due April 15, 2023 [Member]                
Debt Instrument [Line Items]                
Face amount of long-term debt issuance     $ 850,000,000          
Stated rate on debt instrument (percent)     2.70%          
Senior Notes [Member] | Senior Notes Due April 1, 2029 [Member]                
Debt Instrument [Line Items]                
Face amount of long-term debt issuance         $ 1,000,000,000.0      
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]                
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]                
Face amount of long-term debt issuance   $ 500,000,000   $ 500,000,000        
Stated rate on debt instrument (percent)   4.375%   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   $ 500,000,000        
Stated rate on debt instrument (percent)   4.50%   4.50%        
[1] In July 2020, we extended the maturity date of this facility to July 2021 and decreased the facility amount from $1.3 billion to $1.0 billion. The available borrowing capacity was lower than the facility amount due to low product prices impacting the amount of eligible receivables.