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Other Current Assets and Liabilities	6 Months Ended
Other Current Assets and Liabilities	Jun. 30, 2016
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, 2016 and December 31, 2015 were $22 million and $31 million, respectively, of margin deposits and $16 million and $12 million, respectively, of under-recovered gas cost. Included in other current liabilities on the Condensed Consolidated Balance Sheets at June 30, 2016 and December 31, 2015 were $42 million and $55 million, respectively, of over-recovered gas cost.