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Acquisitions and Divestitures Investment Acquisition (Details) - NGPL Holdings, LLC - USD ($) $ in Millions | Dec. 10, 2015 | Dec. 31, 2017
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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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