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Other Current Assets and Liabilities	6 Months Ended
Other Current Assets and Liabilities	Jun. 30, 2014
Other Current Assets and Liabilities [Abstract]
Other Current Assets and Liabilities [Text Block]	Other Current Assets and Liabilities Included in other current assets on the Condensed Consolidated Balance Sheets at June 30, 2014 and December 31, 2013 were $6 million and $4 million, respectively, of margin deposits and $71 million and $22 million, respectively, of under-recovered gas cost. Included in other current liabilities on the Condensed Consolidated Balance Sheets at June 30, 2014 and December 31, 2013 were $62 million and $42 million, respectively, of over-recovered gas cost.