Condensed Consolidating Financial Information (Narrative) (Details) $ in Billions	6 Months Ended
Jun. 30, 2018 USD ($)
Condensed Financial Statements, Captions [Line Items]
Guarantor obligations, current carrying value	$ 2.5
Genesis NEJD Pipeline, LLC
Condensed Financial Statements, Captions [Line Items]
Percentage of equity interest	100.00%

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

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