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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.

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- 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 -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685 + Details
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- Definition Terminalling Agreement, Initial Term + References No definition available. + Details
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- Details
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- Details
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- Details
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