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Debt - Schedule of Carrying Amounts of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Aug. 18, 2025
Jan. 23, 2025
Dec. 31, 2024
Debt Instrument [Line Items]        
Total debt at face value $ 2,800     $ 2,650
Unamortized discount and debt issuance costs (32)     (12)
Total debt 2,768     2,638
Current debt 0     (350)
Long-term debt 2,768     2,288
Level 2        
Debt Instrument [Line Items]        
HF Sinclair, HollyFrontier and HEP Senior Notes 2,861     2,284
Senior Notes        
Debt Instrument [Line Items]        
Total debt at face value 2,800     2,300
Senior Notes | HEP        
Debt Instrument [Line Items]        
Total debt at face value 1     1
Senior Notes | HF Sinclair Senior Notes:        
Debt Instrument [Line Items]        
Total debt at face value $ 2,724     2,021
Senior Notes | 5.875% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 5.875%      
Total debt at face value $ 0     797
Senior Notes | 6.375% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 6.375%      
Total debt at face value $ 0     400
Senior Notes | 5.000% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 5.00%      
Total debt at face value $ 499     499
Senior Notes | 4.500% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 4.50%      
Total debt at face value $ 325     325
Senior Notes | 5.750% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 5.75%   5.75%  
Total debt at face value $ 650     0
Senior Notes | 5.500% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 5.50% 5.50%    
Total debt at face value $ 500     0
Senior Notes | 6.250% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 6.25%   6.25%  
Total debt at face value $ 750     0
Senior Notes | HollyFrontier Senior Notes:        
Debt Instrument [Line Items]        
Total debt at face value $ 75     278
Senior Notes | 5.875% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 5.875%      
Total debt at face value $ 0     203
Senior Notes | 4.500% Senior Notes        
Debt Instrument [Line Items]        
Stated interest rate 4.50%      
Total debt at face value $ 75     75
Senior Notes | HEP 6.375% Senior Notes | HEP        
Debt Instrument [Line Items]        
Stated interest rate 6.375%      
Total debt at face value $ 0     0
Senior Notes | HEP 5.000% Senior Notes | HEP        
Debt Instrument [Line Items]        
Stated interest rate 5.00%      
Total debt at face value $ 1     1
Line of Credit        
Debt Instrument [Line Items]        
Total debt at face value 0     350
Line of Credit | Terminated HEP Credit Agreement | HEP        
Debt Instrument [Line Items]        
Total debt at face value 0     350
Line of Credit | Terminated HF Sinclair Credit Agreement        
Debt Instrument [Line Items]        
Total debt at face value 0     0
Line of Credit | HF Sinclair Credit Agreement        
Debt Instrument [Line Items]        
Total debt at face value $ 0     $ 0