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Debt Obligations - Senior Notes (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Nustar Logistics    
Debt Instrument [Line Items]    
Senior notes $ 2,250  
5.625% senior notes due 2027 | Nustar Logistics    
Debt Instrument [Line Items]    
Stated interest rate 5.625%  
7.25% senior notes due 2032    
Debt Instrument [Line Items]    
Senior notes $ 750 $ 750
5.875% Senior Notes due 2028    
Debt Instrument [Line Items]    
Senior notes $ 400 400
Stated interest rate 5.875%  
GoZone Bonds    
Debt Instrument [Line Items]    
Senior notes $ 322 322
6.250% senior notes due 2033    
Debt Instrument [Line Items]    
Senior notes 1,000 0
5.750% Senior notes due 2025    
Debt Instrument [Line Items]    
Senior notes $ 0 600
5.750% Senior notes due 2025 | Nustar Logistics    
Debt Instrument [Line Items]    
Stated interest rate 5.75%  
5.625% senior notes due 2031    
Debt Instrument [Line Items]    
Senior notes $ 1,000 0
5.875% senior notes due 2034    
Debt Instrument [Line Items]    
Senior notes 900 0
6.00% senior notes due 2026    
Debt Instrument [Line Items]    
Senior notes [1] $ 500 500
6.00% senior notes due 2026 | Nustar Logistics    
Debt Instrument [Line Items]    
Stated interest rate 6.00%  
6.375% senior notes due 2030    
Debt Instrument [Line Items]    
Senior notes $ 600 $ 600
6.375% senior notes due 2030 | Nustar Logistics    
Debt Instrument [Line Items]    
Stated interest rate 6.375%  
Series 2011 GoZone Bonds    
Debt Instrument [Line Items]    
Senior notes $ 75  
Stated interest rate 3.70%  
[1] As of December 31, 2025, $937 million aggregate principal amount of senior notes due before December 31, 2026 were classified as long-term as management has the intent and ability to refinance the borrowings on a long-term basis.