New Assets Held For Sale (Details) - USD ($)	1 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets	$ 167,000,000	$ 0
Total current liabilities	91,000,000	$ 0
Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable	82,000,000
Accrued unbilled revenue	76,000,000
Other current assets	3,000,000
Derivative assets	2,000,000
Total current assets	163,000,000
Non-utility property	4,000,000
TOTAL ASSETS HELD FOR SALE	167,000,000
Derivative liabilities - current	57,000,000
Accounts payable	9,000,000
Total current liabilities	66,000,000
Derivative liabilities - noncurrent	25,000,000
TOTAL LIABILITIES HELD FOR SALE	91,000,000
Impairment of long-live assets to be disposed of	$ 0