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Goodwill Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 01, 2016
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit	$ 3	$ 1,644
Natural Gas Pipelines Regulated
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit	0	1,635
Terminals
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit	3	9
Products Pipelines Terminals
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit	0	0
CO2
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit	$ 0	0
Sale Equity Interest in SNG [Member]
Goodwill [Line Items]
Goodwill, Written off Related to Sale of Business Unit		$ 1,635
Disposal Group, Equity Interest Sold			50.00%

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- Definition

Disposal Group, Equity Interest Sold

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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