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Derivative Financial Instruments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair value measurements
Total Assets	$ 17	$ 7
Total Liabilities	(9)	(2)
Commodity Derivatives
Fair value measurements
Prepaid expenses and other current assets (commodity derivatives)	17	7
Renewable Fuel Standard RFS obligation
Fair value measurements
Other current liabilities (Renewable Fuel Standard “RFS” obligation)	(9)	(2)
Level 1
Fair value measurements
Total Assets	0	0
Total Liabilities	0	0
Level 1 | Commodity Derivatives
Fair value measurements
Prepaid expenses and other current assets (commodity derivatives)	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
Total Assets	17	7
Total Liabilities	(9)	(2)
Level 2 | Commodity Derivatives
Fair value measurements
Prepaid expenses and other current assets (commodity derivatives)	17	7
Level 2 | Renewable Fuel Standard RFS obligation
Fair value measurements
Other current liabilities (Renewable Fuel Standard “RFS” obligation)	(9)	(2)
Level 3
Fair value measurements
Total Assets	0	0
Total Liabilities	0	0
Level 3 | Commodity Derivatives
Fair value measurements
Prepaid expenses and other current assets (commodity derivatives)	0	0
Level 3 | Renewable Fuel Standard RFS obligation
Fair value measurements
Other current liabilities (Renewable Fuel Standard “RFS” obligation)	$ 0	$ 0

X

- 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
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- Definition

Fair value of financial and nonfinancial obligations.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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