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Debt (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Schedule of debt | Debt consisted of the following (in millions):
| June 30, 2018 |  | December 31, 2017
SHORT-TERM DEBT |  |  |  |  |
Commercial paper notes, bearing a weighted-average interest rate of 3.1% and 2.4%, respectively (1) | $ | 259 |  |  | $ | — |
Senior secured hedged inventory facility, bearing a weighted-average interest rate of 3.1% and 2.6%, respectively (1) | 450 |  |  | 664 |
Senior unsecured revolving credit facility, bearing a weighted-average interest rate of 3.4% (1) | 100 |  |  | — |
Other | 134 |  |  | 73 |
Total short-term debt (2) | 943 |  |  | 737 |
LONG-TERM DEBT |  |  |
Senior notes, net of unamortized discounts and debt issuance costs of $63 and $67, respectively | 8,937 |  |  | 8,933 |
Commercial paper notes and senior secured hedged inventory facility borrowings (3) | — |  |  | 247 |
Senior unsecured revolving credit facility, bearing a weighted-average interest rate of 3.4% (3) | 26 |  |  | — |
Other | 3 |  |  | 3 |
Total long-term debt | 8,966 |  |  | 9,183 |
Total debt (4) | $ | 9,909 |  |  | $ | 9,920 |
(1) | We classified these commercial paper notes and credit facility borrowings as short-term as of June 30, 2018 and December 31, 2017, 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) | As of June 30, 2018 and December 31, 2017, balance includes borrowings of $426 million and $212 million, respectively, for cash margin deposits with NYMEX and ICE, which are associated with financial derivatives used for hedging purposes.
(3) | As of June 30, 2018 and December 31, 2017, we classified a portion of our commercial paper notes and credit facility borrowings as long-term based on our ability and intent to refinance such amounts on a long-term basis.
(4) | Our fixed-rate senior notes had a face value of approximately $9.0 billion at both June 30, 2018 and December 31, 2017. We estimated the aggregate fair value of these notes as of June 30, 2018 and December 31, 2017 to be approximately $8.7 billion and $9.1 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.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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