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Debt | 6 Months Ended
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Jun. 30, 2016
Debt |
Debt | Note 7—Debt Debt consisted of the following (in millions):
|  | June 30, |  | December 31, |
|  | 2016 |  | 2015 |
SHORT-TERM DEBT |  |  |  |  |
Commercial paper notes, bearing a weighted-average interest rate of 1.3% and 1.1%, respectively (1) |  | $ | 172 |  | $ | 696 |
Senior secured hedged inventory facility, bearing a weighted-average interest rate of 1.4% and 1.4%, respectively (1) |  | 552 |  | 300 |
Senior notes: |  |  |  |  |
5.88% senior notes due August 2016 |  | 175 |  | — |
6.13% senior notes due January 2017 |  | 400 |  | — |
Other |  | 3 |  | 3 |
Total short-term debt |  | 1,302 |  | 999 |
LONG-TERM DEBT |  |  |  |  |
Senior notes, net of unamortized discounts and debt issuance costs of $72 and $77, respectively |  | 9,128 |  | 9,698 |
Commercial paper notes, bearing a weighted-average interest rate of 1.3% and 1.1%, respectively |  | 354 |  | 672 |
Other |  | 4 |  | 5 |
Total long-term debt |  | 9,486 |  | 10,375 |
Total debt (2) |  | $ | 10,788 |  | $ | 11,374 |
| (1) |  | We classified these commercial paper notes and credit facility borrowings as short-term as of June 30, 2016 and December 31, 2015, as these notes and borrowings were primarily designated as working capital borrowings, were required to be repaid within one year and were primarily for hedged NGL and crude oil inventory and NYMEX and ICE margin deposits.
| (2) |  | Our fixed-rate senior notes (including current maturities) had a face value of approximately $9.8 billion as of both June 30, 2016 and December 31, 2015. We estimated the aggregate fair value of these notes as of June 30, 2016 and December 31, 2015 to be approximately $9.6 billion and $8.6 billion, respectively. Our fixed-rate senior notes are traded among institutions, and these trades are routinely published by a reporting service. Our determination of fair value is based on reported trading activity near the end of the reporting period. We estimate that the carrying value of outstanding borrowings under our credit facilities and commercial paper program approximates fair value as interest rates reflect current market rates. The fair value estimates for our senior notes, credit facilities and commercial paper program are based upon observable market data and are classified in Level 2 of the fair value hierarchy.
Borrowings and Repayments Total borrowings under our credit facilities and commercial paper program for the six months ended June 30, 2016 and 2015 were approximately $23.0 billion and $17.9 billion, respectively. Total repayments under our credit facilities and commercial paper program were approximately $23.6 billion and $17.7 billion for the six months ended June 30, 2016 and 2015, respectively. The variance in total gross borrowings and repayments is impacted by various business and financial factors including, but not limited to, the timing, average term and method of general partnership borrowing activities. Letters of Credit In connection with our supply and logistics activities, we provide certain suppliers with irrevocable standby letters of credit to secure our obligation for the purchase of crude oil, NGL and natural gas. Additionally, we issue letters of credit to support insurance programs, derivative transactions and construction activities. At June 30, 2016 and December 31, 2015, we had outstanding letters of credit of $48 million and $46 million, respectively.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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