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Debt - Components (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Short-term debt: |  |
Total short-term debt | $ 1,384 | $ 999
Long-term debt: |  |
Senior notes, net of unamortized discounts and debt issuance costs of $70 and $77, respectively | 9,130 | 9,698
Other long-term debt | 504 | 677
Total long-term debt | 9,634 | 10,375
Total debt | 11,018 | 11,374
Senior notes |  |
Long-term debt: |  |
Unamortized discounts and debt issuance costs | 70 | 77
Senior notes, net of unamortized discounts and debt issuance costs of $70 and $77, respectively | 9,130 | 9,698
Other |  |
Long-term debt: |  |
Other long-term debt | $ 4 | $ 5
Commercial paper notes |  |
Long-term debt: |  |
Weighted average interest rate, long-term | 1.30% | 1.10%
Other long-term debt | $ 500 | $ 672
Commercial paper notes |  |
Short-term debt: |  |
Weighted average interest rate, short-term | 1.30% | 1.10%
Short-term debt | $ 256 | $ 696
Other |  |
Short-term debt: |  |
Other short-term debt | $ 3 | $ 3
Senior secured hedged inventory facility | Credit facility |  |
Short-term debt: |  |
Weighted average interest rate, short-term | 1.50% | 1.40%
Short-term debt | $ 725 | $ 300
6.13% senior notes due January 2017 | Senior notes |  |
Short-term debt: |  |
Debt instrument, interest rate | 6.13% |
Senior notes, current | $ 400 |

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