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Debt (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Short-term debt: |  |
Commercial paper notes, bearing a weighted-average interest rate of 0.49% and 0.46%, respectively | $ 512 | $ 734
Other short-term debt | 3 | 3
Total short-term debt | 915 | 1,287
Long-term debt: |  |
Senior notes, net of unamortized discount of $16 and $18, respectively | 8,759 | 8,757
Unamortized discount | 16 | 18
Commercial paper notes, bearing a weighted-average interest rate of 0.49% | 373 |
Long-term debt, other | 5 | 5
Total long-term debt | 9,137 | 8,762
Total debt | $ 10,052 | $ 10,049
Commercial paper program |  |
Short-term debt: |  |
Weighted average interest rate, short-term (as a percent) | 0.49% | 0.46%
Long-term debt: |  |
Weighted average interest rate, long-term (as a percent) | 0.49% |
5.25% senior notes due June 2015 |  |
Short-term debt: |  |
Senior Notes, Current |  | $ 150
Long-term debt: |  |
Debt instrument, interest rate (as a percent) |  | 5.25%
3.95% senior notes due September 2015 |  |
Short-term debt: |  |
Senior Notes, Current | $ 400 | $ 400
Long-term debt: |  |
Debt instrument, interest rate (as a percent) | 3.95% | 3.95%

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