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Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Tables) | 9 Months Ended
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Sep. 30, 2015
Summarized Financial Information of Equity Method Investment [Line Items] |
Summarized Balance Sheet Financial Information, Equity Method Investment [Table Text Block] | Summarized unaudited financial information for 100 percent of Enable is presented below at September 30, 2015 and December 31, 2014 and for the three and nine months ended September 30, 2015 and 2014.
Balance Sheet | September 30, 2015 | December 31, 2014
| (In millions)
Current assets | $ | 427 |  | $ | 438 |
Non-current assets | 10,774 |  | 11,399 |
Current liabilities | 804 |  | 671 |
Non-current liabilities | 2,786 |  | 2,344 |

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