Trade Accounts Receivable And Accounts Receivable Securitization Program (Narrative) (Details) (USD $) In Millions, unless otherwise specified					9 Months Ended		9 Months Ended				1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member]	Dec. 31, 2012 Texas Competitive Electric Holdings Company LLC [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] T X U Receivables Company [Member]	Sep. 30, 2013 T X U Receivables Company [Member]	Sep. 30, 2013 Consolidation, Eliminations [Member] Texas Competitive Electric Holdings Company LLC [Member] T X U Receivables Company [Member]	Dec. 31, 2012 Consolidation, Eliminations [Member] Texas Competitive Electric Holdings Company LLC [Member] T X U Receivables Company [Member]	Oct. 31, 2013 Subsequent Event [Member] T X U Receivables Company [Member]	Oct. 31, 2013 Subsequent Event [Member] Consolidation, Eliminations [Member] Texas Competitive Electric Holdings Company LLC [Member] T X U Receivables Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Program Termination, Face Amount of Receivables Repurchased												$ 491
Program Termination, Purchase Price of Receivables Repurchased												474
Program Termination, Repayment of Borrowings To Financial Institution											126
Program Termination, Repayment of Subordinated Notes Payable												11
Maximum funding capacity					200
Program funding					172	82
Decrease in customer deposits held by the originator because TCEH's credit ratings were lower than Ba3/BB-					33
Subordinated notes, limited percentage of uncollected accounts receivable purchased							25.00%
Cash and cash equivalents	1,262	1,175	309	120	1,300			37
Subordinated notes payable									93	97
Unbilled revenue related to gross trade receivables	$ 272	$ 260