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Leases, Future Lease Commencement (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Future Lease Commencement (Textual) |  |
ROU asset |  | $ 1,303
Lease liability |  | $ 1,260
MVP Terminal [Member] | Expected [Member] |  |
Future Lease Commencement (Textual) |  |
ROU asset | $ 1,100 |
Lease liability | $ 1,100 |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: 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=77888419&loc=SL77918627-209977 + Details
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