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Derivative Financial Instruments - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value measurements |  |
Prepaid expenses and other current assets (investments) | $ 3 | $ 7
Total Assets | 3 | 7
Total Liabilities | (16) | (2)
Renewable Fuel Standard RFS obligation |  |
Fair value measurements |  |
Other current liabilities (Renewable Fuel Standard “RFS” obligation) | (16) | (2)
Level 1 |  |
Fair value measurements |  |
Prepaid expenses and other current assets (investments) | 0 | 0
Total Assets | 0 | 0
Total Liabilities | 0 | 0
Level 1 | Renewable Fuel Standard RFS obligation |  |
Fair value measurements |  |
Other current liabilities (Renewable Fuel Standard “RFS” obligation) | 0 | 0
Level 2 |  |
Fair value measurements |  |
Prepaid expenses and other current assets (investments) | 3 | 7
Total Assets | 3 | 7
Total Liabilities | (16) | (2)
Level 2 | Renewable Fuel Standard RFS obligation |  |
Fair value measurements |  |
Other current liabilities (Renewable Fuel Standard “RFS” obligation) | (16) | (2)
Level 3 |  |
Fair value measurements |  |
Prepaid expenses and other current assets (investments) | 0 | 0
Total Assets | 0 | 0
Total Liabilities | 0 | 0
Level 3 | Renewable Fuel Standard RFS obligation |  |
Fair value measurements |  |
Other current liabilities (Renewable Fuel Standard “RFS” obligation) | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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