Background and Basis of Presentation (Details) |
Jun. 30, 2017
state
shares
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Enable Midstream Partners [Member] | ||||
Ownership percentage of equity method investment | 54.10% | [1] | ||
Enable Midstream Partners [Member] | Series A Preferred Stock [Member] | ||||
Preferred units held | shares | 14,520,000 | |||
Natural Gas Distribution [Member] | ||||
Number of states in which entity operates | 6 | |||
Energy Services [Member] | ||||
Number of states in which entity operates | 33 | |||
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