Liabilities Subject To Compromise (Senior Notes and Other) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2015	Dec. 31, 2014	Jan. 31, 2013
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		$ 31,192	$ 31,192
Texas Competitive Electric Holdings Company LLC
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		31,856	31,856
Texas Competitive Electric Holdings Company LLC | Line of Credit [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		22,635
Texas Competitive Electric Holdings Company LLC | Line of Credit [Member] | TCEH Term Loan Facilities maturing October 10, 2014 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		$ 3,809	3,809
Debt Instrument, Basis Spread on Variable Rate		3.50%
Texas Competitive Electric Holdings Company LLC | Line of Credit [Member] | Term Loan Facilities maturing October 10, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt	[1]	$ 15,710	15,710
Debt Instrument, Basis Spread on Variable Rate		4.50%
Texas Competitive Electric Holdings Company LLC | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt				$ 2,054
Texas Competitive Electric Holdings Company LLC | Letter of Credit [Member] | Letter of Credit Facility maturing October 10, 2017 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		$ 1,020	1,020
Texas Competitive Electric Holdings Company LLC | Letter of Credit [Member] | Letter of Credit Facility maturing October 10, 2014 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		42	42
Texas Competitive Electric Holdings Company LLC | Senior Secured Debt [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		1,571
Texas Competitive Electric Holdings Company LLC | Senior Secured Debt [Member] | 11.5% Fixed Senior Secured Notes due October 1, 2020 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		1,750	$ 1,750
Texas Competitive Electric Holdings Company LLC | Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		382
Texas Competitive Electric Holdings Company LLC | Senior Notes [Member] | Fixed Senior Notes due November 1, 2015 and Senior Toggle Notes due November 1, 2016 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		5,237
Eliminations [Member] | Texas Competitive Electric Holdings Company LLC | Line of Credit [Member] | TCEH Term Loan Facilities maturing October 10, 2014 [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		19
Eliminations [Member] | Financial guarantee [Member] | Texas Competitive Electric Holdings Company LLC | Senior Notes [Member]
Debt Instrument [Line Items]
Liabilities Subject To Compromise, Debt		$ 363

[1] As discussed below and in Note 14, principal amounts of notes/term loans totaling $382 million at both September 30, 2015 and December 31, 2014 were held by EFH Corp. and EFIH.