Liabilities Subject To Compromise (Information Regarding Significant Pre-Petition Debt) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2014	Mar. 31, 2014	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Noncurrent Assets			$ 506	$ 901
Texas Competitive Electric Holdings Company LLC
Debt Instrument [Line Items]
Letters of Credit Drawn By Counterparties			45	$ 245
Letters of Credit Drawn By Executive Officers To Satisfy Payments Related To Long-Term Incentive Awards			20
Texas Competitive Electric Holdings Company LLC | Letter of Credit [Member] | TCEH Letter of Credit Facility maturing October 10, 2017 [Member]
Debt Instrument [Line Items]
Noncurrent Assets			506
Letters Of Credit Issued To Affiliated Party		$ 157
Letters Of Credit Drawn By Affiliated Party			$ 150
Letters of Credit Issued To Affiliated Party Remaining At Expiration Date	$ 7