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Investment in Unconsolidated Affiliates Summarized Balance Sheet Information of Equity Method Investment (Tables)
 9 Months Ended
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