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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value measurements |  |
Cash equivalents | $ 50 | $ 15
Other current assets (investments) | 0 | 0
Total Assets | 51 | 15
Total Liabilities | (38) | (65)
Other derivative agreements |  |
Fair value measurements |  |
Other current assets (commodity derivatives) | 1 |
Other current liabilities (other derivative agreements) | (27) | (64)
Biofuels blending obligation |  |
Fair value measurements |  |
Other liabilities (biofuel blending obligation) | (11) | (1)
Level 1 |  |
Fair value measurements |  |
Cash equivalents | 50 | 15
Other current assets (investments) | 0 | 0
Total Assets | 50 | 15
Total Liabilities | 0 | 0
Level 1 | Other derivative agreements |  |
Fair value measurements |  |
Other current assets (commodity derivatives) | 0 |
Other current liabilities (other derivative agreements) | 0 | 0
Level 1 | Biofuels blending obligation |  |
Fair value measurements |  |
Other liabilities (biofuel blending obligation) | 0 | 0
Level 2 |  |
Fair value measurements |  |
Cash equivalents | 0 | 0
Other current assets (investments) | 0 | 0
Total Assets | 1 | 0
Total Liabilities | (38) | (65)
Level 2 | Other derivative agreements |  |
Fair value measurements |  |
Other current assets (commodity derivatives) | 1 |
Other current liabilities (other derivative agreements) | (27) | (64)
Level 2 | Biofuels blending obligation |  |
Fair value measurements |  |
Other liabilities (biofuel blending obligation) | (11) | (1)
Level 3 |  |
Fair value measurements |  |
Cash equivalents | 0 | 0
Other current assets (investments) | 0 | 0
Total Assets | 0 | 0
Total Liabilities | 0 | 0
Level 3 | Other derivative agreements |  |
Fair value measurements |  |
Other current assets (commodity derivatives) | 0 |
Other current liabilities (other derivative agreements) | 0 | 0
Level 3 | Biofuels blending obligation |  |
Fair value measurements |  |
Other liabilities (biofuel blending obligation) | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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