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Investment in Unconsolidated Affiliates Related Party Transactions (Details) (Enable Midstream Partners [Member], Og and E [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Related Party Transaction [Line Items]
Electricity to power electric compression assets	$ 2.9
Operating Costs Charged [Member]
Related Party Transaction [Line Items]
Operating expenses	6.0
Natural Gas Transportation [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	8.7
Natural Gas Storage [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	3.3
Natural Gas Purchases [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Purchases from Related Party	$ 5.0

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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