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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.

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