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Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2015 and December 31, 2014 and for the three months ended March 31, 2015 and March 31, 2014.
Balance Sheet | March 31, 2015 | December 31, 2014
| (In millions)
Current assets | $ | 407 |  | $ | 438 |
Non-current assets | 11,560 |  | 11,399 |
Current liabilities | 841 |  | 671 |
Non-current liabilities | 2,340 |  | 2,344 |

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