Derivative Financial Instruments, Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair value measurements
Prepaid expenses and other current assets (investments)	$ 235	$ 173
Total Assets	241	173
Current portion of long-term debt	(2)	(2)
Long-term debt and finance lease obligations, net of current portion	(1,627)	(1,604)
Total Liabilities	(2,034)	(1,837)
Commodity derivatives
Fair value measurements
Prepaid expenses and other current assets (commodity derivatives)	6
Other current liabilities (derivatives)		(17)
Commodity swaps
Fair value measurements
Other current liabilities (derivatives)	(63)
RFS obligation
Fair value measurements
Other current liabilities (RFS obligation)	(342)	(214)
Level 1
Fair value measurements
Prepaid expenses and other current assets (investments)	235	173
Total Assets	235	173
Current portion of long-term debt	0	0
Long-term debt and finance lease obligations, net of current portion	0	0
Total Liabilities	0	0
Level 1 \| Commodity derivatives
Fair value measurements
Prepaid expenses and other current assets (commodity derivatives)	0
Other current liabilities (derivatives)		0
Level 1 \| Commodity swaps
Fair value measurements
Other current liabilities (derivatives)	0
Level 1 \| RFS obligation
Fair value measurements
Other current liabilities (RFS obligation)	0	0
Level 2
Fair value measurements
Prepaid expenses and other current assets (investments)	0	0
Total Assets	6	0
Current portion of long-term debt	(2)	(2)
Long-term debt and finance lease obligations, net of current portion	(1,627)	(1,604)
Total Liabilities	(2,034)	(1,837)
Level 2 \| Commodity derivatives
Fair value measurements
Prepaid expenses and other current assets (commodity derivatives)	6
Other current liabilities (derivatives)		(17)
Level 2 \| Commodity swaps
Fair value measurements
Other current liabilities (derivatives)	(63)
Level 2 \| RFS obligation
Fair value measurements
Other current liabilities (RFS obligation)	(342)	(214)
Level 3
Fair value measurements
Prepaid expenses and other current assets (investments)	0	0
Total Assets	0	0
Current portion of long-term debt	0	0
Long-term debt and finance lease obligations, net of current portion	0	0
Total Liabilities	0	0
Level 3 \| Commodity derivatives
Fair value measurements
Prepaid expenses and other current assets (commodity derivatives)	0
Other current liabilities (derivatives)		0
Level 3 \| Commodity swaps
Fair value measurements
Other current liabilities (derivatives)	0
Level 3 \| RFS obligation
Fair value measurements
Other current liabilities (RFS obligation)	$ 0	$ 0

Long-Term Debt, Current Maturities, Fair Value

No definition available.

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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

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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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 portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of other liabilities.

+ References

No definition available.

+ Details

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