Short-Term Borrowings And Long-Term Debt (Information Regarding Other Significant Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended			9 Months Ended							9 Months Ended								9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [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] Line of Credit [Member] TCEH Term Loan Facilities maturing October 10, 2014 [Member]	Dec. 31, 2012 Texas Competitive Electric Holdings Company LLC [Member] Line of Credit [Member] TCEH Term Loan Facilities maturing October 10, 2014 [Member]		Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Line of Credit [Member] TCEH Term Loan Facilities maturing October 10, 2017 [Member]		Dec. 31, 2012 Texas Competitive Electric Holdings Company LLC [Member] Line of Credit [Member] TCEH Term Loan Facilities maturing October 10, 2017 [Member]		Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Senior Secured Debt [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Senior Secured Debt [Member] 11.5% Fixed Senior Secured Notes due October 1, 2020 [Member]	Dec. 31, 2012 Texas Competitive Electric Holdings Company LLC [Member] Senior Secured Debt [Member] 11.5% Fixed Senior Secured Notes due October 1, 2020 [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Senior Notes [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Senior Notes [Member] Consolidation, Eliminations [Member] Financial guarantee [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Senior Notes [Member] 10.25% Fixed Senior Notes due November 1, 2015 [Member]		Dec. 31, 2012 Texas Competitive Electric Holdings Company LLC [Member] Senior Notes [Member] 10.25% Fixed Senior Notes due November 1, 2015 [Member]		Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Senior Notes [Member] 10.50 / 11.25% Senior Toggle Notes due November 1, 2016 [Member]	Dec. 31, 2012 Texas Competitive Electric Holdings Company LLC [Member] Senior Notes [Member] 10.50 / 11.25% Senior Toggle Notes due November 1, 2016 [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] Letter of Credit [Member] TCEH Letter of Credit Facility maturing October 10, 2017 [Member]		Dec. 31, 2012 Texas Competitive Electric Holdings Company LLC [Member] Letter of Credit [Member] TCEH Letter of Credit Facility maturing October 10, 2017 [Member]		Jan. 31, 2013 Subsequent Event [Member] Texas Competitive Electric Holdings Company LLC [Member] Revolving Credit Facility [Member]	Jan. 31, 2013 Subsequent Event [Member] Texas Competitive Electric Holdings Company LLC [Member] Revolving Credit Facility [Member] Revolving Credit Facility maturing October 2013 Extended to October 2016 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 3,116																								$ 2,054	$ 645
Basis Spread on LIBOR Rate (as a percent)				3.50%			4.50%															4.50%
Debt Instrument, Springing maturity provision pursuant if in the event that aggregate principal amount to the extent held at the determination date, Exceeds Minimum																500				150
Long-term debt, gross			$ 22,635	$ 3,809	$ 3,809	[1],[2]	$ 15,710	[1],[2],[3]	$ 15,370	[1],[2],[3]	$ 1,571	$ 1,750	$ 1,750	$ 5,237	$ 363	$ 2,046	[3]	$ 2,046	[3]	$ 1,749	$ 1,749	$ 1,020	[1]	$ 1,020	[1]
Ownership interest (as a percent)	100.00%
Debt Instrument, Springing maturity provision, remaining outstanding days prior to maturity														91 days
Total debt to Adjusted EBITDA ratio at Determination Date														6
Debt Instrument, Springing maturity provision, remaining outstanding days prior to maturity automatic extention if Adjusted EBITDA ratio at determination date														90 days

[1] Interest rates in effect at September 30, 2013.

[2] Interest rate swapped to fixed on $18.140 billion principal amount of maturities through October 2014 and up to an aggregate $12.6 billion principal amount from October 2014 through

[3] As discussed below and in Note 11, principal amounts of notes/term loans totaling $382 million at both September 30, 2013 and December 31, 2012 were held by EFH Corp. and EFIH.