Leases, Future Lease Commencement (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Future Lease Commencement (Textual)
Finance lease ROU asset		$ 790
Finance lease liability		$ 791
MVP Terminal [Member] \| Expected [Member]
Future Lease Commencement (Textual)
Finance lease ROU asset	$ 1,500
Finance lease liability	$ 1,500

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

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=77888426&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=77888419&loc=SL77918627-209977

Name:	us-gaap_FinanceLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant