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Debt - Components (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term debt: |  |
Total short-term debt | $ 470 | $ 66
Long-term debt: |  |
Senior notes, net of unamortized discounts and debt issuance costs of $55 and $59, respectively | 8,945 | 8,941
Other long-term debt, net | 231 | 202
Total long-term debt | 9,176 | 9,143
Total debt | 9,646 | 9,209
Senior notes |  |
Long-term debt: |  |
Senior notes, net of unamortized discounts and debt issuance costs of $55 and $59, respectively | 8,945 | 8,941
Unamortized discounts and debt issuance costs | 55 | 59
Debt instrument face value | 9,000 | 9,000
Other |  |
Long-term debt: |  |
Other long-term debt, net | 32 | 4
Commercial paper |  |
Short-term debt: |  |
Short-term debt | $ 218 |
Weighted average interest rate, short-term | 3.00% |
Other |  |
Short-term debt: |  |
Total short-term debt | $ 152 | 66
Senior secured hedged inventory facility | Line of credit |  |
Short-term debt: |  |
Short-term debt | $ 100 |
Weighted average interest rate, short-term | 3.50% |
GO Zone term loans | Term loan |  |
Long-term debt: |  |
Other long-term debt, net | $ 199 | $ 198
Weighted average interest rate, long-term | 3.20% | 3.10%
Debt issuance costs | $ 1 | $ 2
5.75% Senior Notes Due In January 2020 | Senior notes |  |
Long-term debt: |  |
Debt instrument face value | $ 500 |
Stated percentage | 5.75% |
2.60% Senior Notes Due In December 2019 | Senior notes |  |
Long-term debt: |  |
Debt instrument face value | $ 500 | $ 500
Stated percentage | 2.60% | 2.60%
Level 2 | Senior notes |  |
Long-term debt: |  |
Debt instrument fair value | $ 9,300 | $ 8,600

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