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Debt - Components (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Jan. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Short-term debt: |  |  |
Total short-term debt | $ 1,341 |  | $ 1,715
Long-term debt: |  |  |
Senior notes, net of unamortized discounts and debt issuance costs of $74 and $76, respectively | 9,876 |  | 9,874
Other long-term debt | 3 |  | 250
Total long-term debt | 9,879 |  | 10,124
Total debt | 11,220 |  | $ 11,839
Commercial paper notes |  |  |
Long-term debt: |  |  |
Weighted average interest rate, long-term |  |  | 1.60%
Other long-term debt |  |  | $ 247
Senior notes |  |  |
Long-term debt: |  |  |
Unamortized discounts and debt issuance costs | 74 |  | 76
Senior notes, net of unamortized discounts and debt issuance costs of $74 and $76, respectively | 9,876 |  | 9,874
Other |  |  |
Long-term debt: |  |  |
Other long-term debt | $ 3 |  | $ 3
Commercial paper notes |  |  |
Short-term debt: |  |  |
Weighted average interest rate, short-term | 1.90% |  | 1.60%
Short-term debt | $ 958 |  | $ 563
Other |  |  |
Short-term debt: |  |  |
Other short-term debt | $ 133 |  | $ 2
Senior secured hedged inventory facility | Credit facility |  |  |
Short-term debt: |  |  |
Weighted average interest rate, short-term | 2.00% |  | 1.80%
Short-term debt | $ 250 |  | $ 750
6.13% senior notes due January 2017 | Senior notes |  |  |
Short-term debt: |  |  |
Debt instrument, interest rate |  | 6.13% | 6.13%
Senior notes, current |  |  | $ 400

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