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Derivative Financial Instruments - Schedule of Gains (Losses) on Derivatives (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) derivative	Mar. 31, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivatives, net	$ 16	$ 59
Forward purchases
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivatives, net	$ 17	14
Forward Contracts, RINs
Derivative Instruments, Gain (Loss) [Line Items]
Outstanding positions | derivative	26,000,000
Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivatives, net	$ 0	45
Commodity Swap
Derivative Instruments, Gain (Loss) [Line Items]
Outstanding positions | derivative	0
Futures
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivatives, net	$ (1)	$ 0

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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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.

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

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