Trade Accounts Receivable And Accounts Receivable Securitization Program (Program fee amounts/ Activities of TXU Receivables Company/ Trade Accounts Receivable/ Allowance for Uncollectible Accounts Receivable) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] T X U Receivables Company [Member]	Sep. 30, 2012 Texas Competitive Electric Holdings Company LLC [Member] T X U Receivables Company [Member]	Sep. 30, 2013 Texas Competitive Electric Holdings Company LLC [Member] T X U Receivables Company [Member]		Sep. 30, 2012 Texas Competitive Electric Holdings Company LLC [Member] T X U Receivables Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Program fees				$ (3)	$ (2)	$ (6)		$ (6)
Program fees as a percentage of average funding (annualized)				5.10%	4.90%	5.80%		6.20%
Cash collections on accounts receivable						3,200		3,501
Face amount of new receivables purchased (a)						(3,328)	[1]	(3,571)	[1]
Discount from face amount of purchased receivables						29		8
Servicing fees paid for recordkeeping and collection services						0		(2)
Decrease in subordinated notes payable						(4)		(10)
Increase in cash held						17		0
Accounts Receivable Securitization Program, Other, Net						2		0
Cash flows provided to originator under the program						(90)		(80)
Wholesale and retail trade accounts receivable	813		719
Wholesale and retail trade accounts receivable, pledged retail receivables	574		445
Allowance for uncollectible accounts	(17)	(15)
Trade accounts receivable — reported in balance sheet, including $573 and $445 in pledged retail receivables	796		710
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for uncollectible accounts receivable at beginning of period	9	27
Increase for bad debt expense	23	20
Decrease for account write-offs	(15)	(32)
Allowance for uncollectible accounts receivable at end of period	$ 17	$ 15

[1] Net of allowance for uncollectible accounts.