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Derivative Financial Instruments - Schedule of Gains (Losses) on Derivatives (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) derivative	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	$ 146	$ (70)	$ (19)
Forward purchases
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	$ 103	(26)	0
Forward Contracts, 2019 RINs
Derivative Instruments, Gain (Loss) [Line Items]
Outstanding positions | derivative	27,000,000
Forward purchase price	$ 4
Forward Contracts, 2018 RINs
Derivative Instruments, Gain (Loss) [Line Items]
Outstanding positions | derivative	8,000,000
Forward purchase price	$ 3
Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	$ 44	(43)	(19)
Commodity Swap
Derivative Instruments, Gain (Loss) [Line Items]
Outstanding positions | derivative	0
Futures
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	$ (1)	$ (1)	$ 0

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- Definition

Derivative, Total Forward Price

+ References

No definition available.

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- 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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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

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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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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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