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Acquisitions and Divestitures Investment Acquisition (Details) - NGPL Holdings LLC
$ in Millions
Dec. 10, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]  
Equity Method Investment, Ownership Percentage 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. [Member]  
Schedule of Equity Method Investments [Line Items]  
Equity Method Investment, Ownership Percentage 50.00%