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Derivative Financial Instruments, Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Fair value measurements
Total assets	$ 13	$ 1
Long-term debt and finance lease obligations, net of current portion (long-term debt)	(1,512)	(1,620)
Total liabilities	(2,097)	(2,116)
Commodity derivatives
Fair value measurements
Other current assets (commodity derivatives)	13	1
Other current liabilities (commodity derivatives)		(2)
RFS obligation
Fair value measurements
Other current liabilities (RFS obligations)	(585)	(494)
Level 1
Fair value measurements
Total assets	0	0
Long-term debt and finance lease obligations, net of current portion (long-term debt)	0	0
Total liabilities	0	0
Level 1 | Commodity derivatives
Fair value measurements
Other current assets (commodity derivatives)	0	0
Other current liabilities (commodity derivatives)		0
Level 1 | RFS obligation
Fair value measurements
Other current liabilities (RFS obligations)	0	0
Level 2
Fair value measurements
Total assets	13	1
Long-term debt and finance lease obligations, net of current portion (long-term debt)	(1,512)	(1,620)
Total liabilities	(2,097)	(2,116)
Level 2 | Commodity derivatives
Fair value measurements
Other current assets (commodity derivatives)	13	1
Other current liabilities (commodity derivatives)		(2)
Level 2 | RFS obligation
Fair value measurements
Other current liabilities (RFS obligations)	(585)	(494)
Level 3
Fair value measurements
Total assets	0	0
Long-term debt and finance lease obligations, net of current portion (long-term debt)	0	0
Total liabilities	0	0
Level 3 | Commodity derivatives
Fair value measurements
Other current assets (commodity derivatives)	0	0
Other current liabilities (commodity derivatives)		0
Level 3 | RFS obligation
Fair value measurements
Other current liabilities (RFS obligations)	$ 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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
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+ References

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

No definition available.

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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

Fair value portion of other liabilities.

+ References

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