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Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Tables)
 6 Months Ended
Jun. 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 June 30, 2015 and December 31, 2014 and for the six months ended June 30, 2015 and June 30, 2014.
Balance Sheet
June 30, 2015
December 31, 2014
 
(In millions)
Current assets
$
415

$
438

Non-current assets
11,765

11,399

Current liabilities
834

671

Non-current liabilities
2,611

2,344