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Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Tables) | Sep. 30, 2013
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Summarized Financial Information of Equity Method Investment [Line Items] |
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block] | As Enable Midstream Partners began operations on May 1, 2013, summarized unaudited financial information for 100 percent of Enable Midstream Partners is presented below at September 30, 2013 and for the three and five months ended September 30, 2013.
Balance Sheet | September 30, 2013
| (In millions)
Current assets | $ | 427.5 |
Non-current assets | 10,537.1 |
Current liabilities | 622.1 |
Non-current liabilities | 2,140.4 |

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