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Debt - Components (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Jan. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Short-term debt: |  |  |
Total short-term debt | $ 1,114 |  | $ 1,715
Long-term debt: |  |  |
Senior notes, net of unamortized discounts and debt issuance costs of $72 and $76, respectively | 9,878 |  | 9,874
Other long-term debt | 162 |  | 250
Total long-term debt | 10,040 |  | 10,124
Total debt | 11,154 |  | 11,839
Commercial paper notes |  |  |
Long-term debt: |  |  |
Other long-term debt | $ 159 |  | $ 247
Weighted average interest rate, long-term | 2.00% |  | 1.60%
Senior notes |  |  |
Long-term debt: |  |  |
Senior notes, net of unamortized discounts and debt issuance costs of $72 and $76, respectively | $ 9,878 |  | $ 9,874
Unamortized discounts and debt issuance costs | 72 |  | 76
Debt instrument face value | 9,900 |  | 10,300
Other |  |  |
Long-term debt: |  |  |
Other long-term debt | 3 |  | 3
Level 2 | Senior notes |  |  |
Long-term debt: |  |  |
Debt instrument fair value | 10,100 |  | 10,400
Commercial paper notes |  |  |
Short-term debt: |  |  |
Short-term notes and borrowings | $ 677 |  | $ 563
Weighted average interest rate, short-term | 2.00% |  | 1.60%
Other |  |  |
Short-term debt: |  |  |
Total short-term debt | $ 137 |  | $ 2
Senior secured hedged inventory facility | Credit facility |  |  |
Short-term debt: |  |  |
Short-term notes and borrowings | $ 300 |  | $ 750
Weighted average interest rate, short-term | 2.30% |  | 1.80%
6.50% senior notes due May 2018 | Senior notes |  |  |
Short-term debt: |  |  |
Debt instrument, interest rate | 6.50% |  |
Long-term debt: |  |  |
Debt instrument face value | $ 600 |  |
6.13 percent senior notes due January 2017 | Senior notes |  |  |
Short-term debt: |  |  |
Senior notes, current |  |  | $ 400
Debt instrument, interest rate |  | 6.13% | 6.13%
Exchange Traded |  |  |
Short-term debt: |  |  |
Total short-term debt | $ 12 |  | $ 410

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