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Leases, Significant Lease Commencement (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Significant Lease Commencement (Textual)
Finance lease ROU asset and related liability recognized	[1]			$ 950	$ 239
Finance lease liability		$ 1,664		$ 1,664	$ 791
MVP Terminalling, LLC (MVP) [Member]
Significant Lease Commencement (Textual)
Initial term of terminal agreement				12 years
MVP Terminalling, LLC (MVP) [Member]
Significant Lease Commencement (Textual)
Membership interest (percent)				50.00%
MVP Terminal [Member]
Significant Lease Commencement (Textual)
Finance lease ROU asset and related liability recognized			$ 1,400	$ 800
Finance lease liability		800		$ 800
MVP Terminal [Member] | Derecognition due to Remeasurement [Member]
Significant Lease Commencement (Textual)
Finance lease ROU asset and related liability recognized		$ (600)
[1] Noncash activity for the year ended December 31, 2020 primarily included approximately $800 million for a finance lease ROU asset and related liability recognized in connection with the terminaling agreement with MVP described in Note 6. Noncash activity for the year ended December 31, 2019 included $1.3 billion for operating lease ROU assets and related liabilities recorded on January 1, 2019 upon adoption of Topic 842.

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 45
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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- References

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- Definition

Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

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-SubTopic 10
-Section 50
-Paragraph 5A
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- Definition

Terminalling Agreement, Initial Term

+ References

No definition available.

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