Short-Term Borrowings And Long-Term Debt (Debt Related Activity) (Details) (USD $)	9 Months Ended							9 Months Ended			1 Months Ended		9 Months Ended													1 Months Ended					1 Months Ended						1 Months Ended										1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jan. 31, 2013 Senior Secured Debt [Member]	Sep. 30, 2013 Energy Future Holdings Corp. [Member]	Jan. 31, 2013 Energy Future Holdings Corp. [Member] Senior Notes [Member]	Jan. 31, 2013 Energy Future Holdings Corp. [Member] Senior Secured Debt [Member]	Sep. 30, 2013 Energy Future Competitive Holdings Company [Member]	Sep. 30, 2012 Energy Future Competitive Holdings Company [Member]	Dec. 31, 2012 Energy Future Competitive Holdings Company [Member]	Apr. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Senior Notes [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Fixed Secured Facility Bonds [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Line of Credit [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Senior Secured Debt [Member]	Sep. 30, 2013 Fixed 7.48% Secured Facility Bonds With Amortizing Payments Through January 2017 [Member] Texas Competitive Electric Holdings Company LLC [Member] Fixed Secured Facility Bonds [Member]	Jun. 30, 2013 Fixed 7.48% Secured Facility Bonds With Amortizing Payments Through January 2017 [Member] Texas Competitive Electric Holdings Company LLC [Member] Fixed Secured Facility Bonds [Member]	Dec. 31, 2012 Fixed 7.48% Secured Facility Bonds With Amortizing Payments Through January 2017 [Member] Texas Competitive Electric Holdings Company LLC [Member] Fixed Secured Facility Bonds [Member]	Sep. 30, 2013 11.5% Fixed Senior Secured Notes due October 1, 2020 [Member] Texas Competitive Electric Holdings Company LLC [Member] Senior Secured Debt [Member]	Dec. 31, 2012 11.5% Fixed Senior Secured Notes due October 1, 2020 [Member] Texas Competitive Electric Holdings Company LLC [Member] Senior Secured Debt [Member]	Sep. 30, 2013 11.25 / 12.00% Senior Toggle Notes due November 1, 2017 [Member] Energy Future Holdings Corp. [Member] Senior Notes [Member]		Jan. 31, 2013 11.25 / 12.00% Senior Toggle Notes due November 1, 2017 [Member] Energy Future Holdings Corp. [Member] Senior Notes [Member]	Dec. 31, 2012 11.25 / 12.00% Senior Toggle Notes due November 1, 2017 [Member] Energy Future Holdings Corp. [Member] Senior Notes [Member]		Jan. 31, 2013 10.875% Fixed Senior Notes due November 1, 2017 [Member] Energy Future Intermediate Holding CO LLC [Member]	Sep. 30, 2013 10.875% Fixed Senior Notes due November 1, 2017 [Member] Energy Future Holdings Corp. [Member] Senior Notes [Member]		Dec. 31, 2012 10.875% Fixed Senior Notes due November 1, 2017 [Member] Energy Future Holdings Corp. [Member] Senior Notes [Member]		Jan. 31, 2013 Toggle Notes [Member] Energy Future Intermediate Holding CO LLC [Member]	Jan. 31, 2013 10% Fixed Senior Secured First Lien Notes due January 15, 2020 [Member] Energy Future Intermediate Holding CO LLC [Member]	Sep. 30, 2013 10% Fixed Senior Secured First Lien Notes due January 15, 2020 [Member] Energy Future Holdings Corp. [Member] Senior Secured Debt [Member]		Dec. 31, 2012 10% Fixed Senior Secured First Lien Notes due January 15, 2020 [Member] Energy Future Holdings Corp. [Member] Senior Secured Debt [Member]		Jan. 31, 2013 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member] Energy Future Intermediate Holding CO LLC [Member]	Sep. 30, 2013 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member] Energy Future Holdings Corp. [Member] Senior Secured Debt [Member]		Dec. 31, 2012 9.75% Fixed Senior Secured First Lien Notes due October 15, 2019 [Member] Energy Future Holdings Corp. [Member] Senior Secured Debt [Member]		Jan. 31, 2013 5.55% Fixed Series P Senior Notes due November 15, 2014 [Member] Energy Future Competitive Holdings Company [Member] Senior Notes [Member]	Jan. 31, 2013 10% Senior Secured Notes Due 2020 [Member] Energy Future Intermediate Holding CO LLC [Member] Senior Secured Debt [Member]	Jan. 31, 2013 9.75% Senior Secured Notes Due 2019 [Member] Energy Future Intermediate Holding CO LLC [Member] Senior Secured Debt [Member]	Jan. 31, 2013 11.25%/12.25% Senior Toggle Notes Due 2018 [Member] Energy Future Intermediate Holding CO LLC [Member] Senior Notes [Member]	Jan. 31, 2013 10.875% Senior Notes due 2017 [Member] Energy Future Holdings Corp. [Member] Senior Notes [Member]	Jan. 31, 2013 Related Party Transactions, Returned Debt as Dividend [Member] Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross												$ 5,237,000,000		$ 22,635,000,000	$ 1,571,000,000	$ 36,000,000	$ 45,000,000	$ 0	$ 1,750,000,000	$ 1,750,000,000	$ 14,000,000	[1]		$ 30,000,000	[1]		$ 16,000,000	[1]	$ 32,000,000	[1]			$ 0	[1]	$ 330,000,000	[1]		$ 0	[1]	$ 58,000,000	[1]		$ 1,302,000,000		$ 89,000,000
Short-term borrowings	2,226,000,000		2,136,000,000					0		0
Debt instrument, issued face amount				1,058,000,000.000	1,266,000,000.000	95,000,000	1,310,000,000.000																33,000,000																			31,000,000		139,000,000		31,000,000
Debt Instrument, Principal Amounts Cancelled																																															6,360,000,000
Repurchases of long-term debt	94,000,000	30,000,000						3,000,000	4,000,000				17,000,000
Repayments of principal at scheduled maturity dates	86,000,000																									0					3,474,000,000	1,058,000,000					113,000,000
Repayments of contractual payments under capitalized lease obligations	8,000,000
Decrease in other short-term borrowings (Note 5)	0	(385,000,000)							0
Acquisition of combustion turbine trust interest	(40,000,000)							0			40,000,000
Combustion Turbine Asset Acquired, Fair Value											83,000,000
Deferred Lease Liability and and Unamortized Lease Valuation Reserve											$ 18,000,000

[1] Represents 50% of the amount of these EFH Corp. securities guaranteed by, and pushed down to (pushed-down debt), EFCH (parent entity) per the discussion below under "Guarantees and Push Down of EFH Corp. Debt."