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Debt (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Short-term debt: |  |
Other short-term debt | $ 3 | $ 4
Total short-term debt | 763 | 1,113
Long-term debt: |  |
Senior notes, net of unamortized discounts of $16 and $15, respectively | 7,409 | 6,710
Unamortized discounts | 16 | 15
Long-term debt, other | 5 | 5
Total long-term debt | 7,414 | 6,715
Total debt | 8,177 | 7,828
Senior notes |  |
Long-term debt: |  |
Senior notes, net of unamortized discounts of $16 and $15, respectively | 7,409 | 6,710
Unamortized discounts | 16 | 15
5.25% senior notes maturing in June 2015 |  |
Long-term debt: |  |
Debt instrument, interest rate (as a percent) | 5.25% |
Senior notes | 150 |
Commercial paper notes |  |
Short-term debt: |  |
PAA commercial paper notes, bearing a weighted-average interest rate of 0.29% and 0.33%, respectively | $ 760 | $ 1,109
Weighted average interest rate, short-term (as a percent) | 0.29% | 0.33%

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