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Subsequent Events (Details) - Subsequent Event [Member] - Enable Midstream Partners [Member]
$ / shares in Units, $ in Millions
Feb. 08, 2019
USD ($)
$ / shares
Series A Preferred Units [Member]  
Subsequent Event [Line Items]  
Declaration Date Feb. 08, 2019
Record Date Feb. 08, 2019
Payment Date Feb. 14, 2019
Distributions Declared, Per Unit | $ / shares $ 0.625
Expected cash distribution on Enable's Series A Preferred Units | $ $ 9
Common Units [Member]  
Subsequent Event [Line Items]  
Declaration Date Feb. 08, 2019
Record Date Feb. 19, 2019
Payment Date Feb. 26, 2019
Distributions Declared, Per Unit | $ / shares $ 0.318
Expected cash distribution on Enable Common Units | $ $ 74