Business And Significant Accounting Policies (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011
Business and Significant Accounting Policies
Cash and cash equivalents	$ 1,262,000,000	$ 1,175,000,000		$ 309,000,000	$ 120,000,000
Texas Competitive Electric Holdings Company LLC [Member]
Business and Significant Accounting Policies
Cash and cash equivalents	1,300,000,000
Energy Future Competitive Holdings Company [Member]
Business and Significant Accounting Policies
Debt Long-term And Short-term Combined Amount, Gross	32,200,000,000
Parent/ Guarantor [Member]
Business and Significant Accounting Policies
Cash and cash equivalents	0	0		0	0
Debt Long-term And Short-term Combined Amount, Gross	700,000,000
Energy Future Intermediate Holding CO LLC [Member]
Business and Significant Accounting Policies
Debt Long-term And Short-term Combined Amount, Gross	7,600,000,000
Line of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Business and Significant Accounting Policies
Long-term Debt, Gross	22,635,000,000
Letter of Credit Facility maturing October 2017 [Member] | Letter of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Business and Significant Accounting Policies
Resticted cash, additional letters of credit that can be supported	171,000,000
TCEH Term Loan Facilities maturing October 10, 2014 [Member] | Line of Credit [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Business and Significant Accounting Policies
Long-term Debt, Gross	$ 3,809,000,000	$ 3,809,000,000	[1],[2]

[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