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Acquisitions and Divestitures Investment Acquisition (Details) - NGPL Holdings, LLC - USD ($) $ in Millions	Dec. 10, 2015	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%
Payments to Acquire Assets, Investing Activities	$ 136
Equity Method Investment, Incremental Ownership Percentage Acquired	30.00%
KMI and Brookfield Infrastructure Partners L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Incremental Ownership Percentage Acquired	53.00%
Brookfield Infrastructure Partners L.P.
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities.

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