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Debt (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Short-term debt: |  |
Commercial paper notes, bearing a weighted-average interest rate of 0.43% and 0.46%, respectively | $ 678 | $ 734
Other short-term debt | 3 | 3
Total short-term debt | 681 | 1,287
Long-term debt: |  |
Senior notes, net of unamortized discount of $18 and $18, respectively | 9,757 | 8,757
Unamortized discount | 18 | 18
Commercial paper notes, bearing a weighted-average interest rate of 0.43% | 208 |
Other long-term debt | 5 | 5
Total long-term debt | 9,970 | 8,762
Total debt | $ 10,651 | $ 10,049
Commercial paper program |  |
Short-term debt: |  |
Weighted average interest rate, short-term (as a percent) | 0.43% | 0.46%
Long-term debt: |  |
Weighted average interest rate, long-term (as a percent) | 0.43% |
5.25% senior notes due June 2015 |  |
Debt |  |
Debt instrument, interest rate (as a percent) |  | 5.25%
Short-term debt: |  |
Senior Notes, Current |  | $ 150
3.95% senior notes due September 2015 |  |
Debt |  |
Debt instrument, interest rate (as a percent) |  | 3.95%
Short-term debt: |  |
Senior Notes, Current |  | $ 400
5.88% senior notes due August 2016 |  |
Debt |  |
Debt instrument, interest rate (as a percent) | 5.88% |
Long-term debt: |  |
Senior Notes, Noncurrent | $ 175 |

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