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Debt - Components (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term debt: |  |
Total short-term debt | $ 943 | $ 737
Long-term debt: |  |
Senior notes, net of unamortized discounts and debt issuance costs of $63 and $67, respectively | 8,937 | 8,933
Other long-term debt | 29 | 250
Total long-term debt | 8,966 | 9,183
Total debt | 9,909 | 9,920
Senior notes |  |
Long-term debt: |  |
Senior notes, net of unamortized discounts and debt issuance costs of $63 and $67, respectively | 8,937 | 8,933
Unamortized discounts and debt issuance costs | 63 | 67
Debt instrument face value | 9,000 | 9,000
Other long-term debt |  |
Long-term debt: |  |
Other long-term debt | 3 | $ 3
Commercial paper notes |  |
Short-term debt: |  |
Short-term notes and borrowings | $ 259 |
Weighted average interest rate, short-term | 3.10% | 2.40%
Other |  |
Short-term debt: |  |
Total short-term debt | $ 134 | $ 73
Senior secured hedged inventory facility | Commercial paper notes |  |
Long-term debt: |  |
Other long-term debt |  | 247
Senior secured hedged inventory facility | Credit facility |  |
Short-term debt: |  |
Short-term notes and borrowings | $ 450 | $ 664
Weighted average interest rate, short-term | 3.10% | 2.60%
Senior unsecured revolving credit facility | Credit facility |  |
Long-term debt: |  |
Other long-term debt | $ 26 |
Weighted average interest rate, long-term | 3.40% |
Senior unsecured revolving credit facility | Credit facility |  |
Short-term debt: |  |
Short-term notes and borrowings | $ 100 |
Weighted average interest rate, short-term | 3.40% |
Cash margin deposits |  |
Short-term debt: |  |
Short-term notes and borrowings | $ 426 | $ 212
Level 2 | Senior notes |  |
Long-term debt: |  |
Debt instrument fair value | $ 8,700 | $ 9,100

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