Short-Term Borrowings And Long-Term Debt (TCEH Interest Rate Swap Transactions) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Derivative [Line Items]
Unrealized net gain (loss)	$ 413		$ (20)	$ 899		$ (16)
Interest rate swaps [Member]
Derivative [Line Items]
Derivative, Notional Amount	30,740	[1]		30,740	[1]		31,060	[1]
Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Derivative [Line Items]
Accumulated Unrealized Gain (Loss) On Interest Rate Derivative Instruments Not Designated As Hedging Instruments Net Of Nonperformance Risk Adjustments	1,167			1,167
Realized net loss	(160)		(168)	(466)		(505)
Unrealized net gain (loss)	413		(20)	899		(16)
Total	253		(188)	433		(521)
Accumulated unrealized gain (loss) on interest rate derivative instruments not designated as hedging instruments	1,520			1,520			2,065
Accumulated unrealized gain (loss) on interest rate derivative instruments not designated as hedges Other Comprehensive Income, pre-tax	57			57			65
Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member] | October 2012 through October 2014 [Member]
Derivative [Line Items]
Derivative, Notional Amount	18,140	[2]		18,140	[2]
Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member] | October 2015 through October 2017 [Member]
Derivative [Line Items]
Derivative, Notional Amount	12,600	[3]		12,600	[3]
Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Expires in October 2015 and the remainder in October 2017 [Member]
Derivative [Line Items]
Derivative, Notional Amount	3,000			3,000
Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Minimum [Member] | October 2012 through October 2014 [Member]
Derivative [Line Items]
Swap interest rate (as a percent)	5.50%	[2]		5.50%	[2]
Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Minimum [Member] | October 2015 through October 2017 [Member]
Derivative [Line Items]
Swap interest rate (as a percent)	6.80%	[3]		6.80%	[3]
Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Maximum [Member] | October 2012 through October 2014 [Member]
Derivative [Line Items]
Swap interest rate (as a percent)	9.30%	[2]		9.30%	[2]
Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member] | Maximum [Member] | October 2015 through October 2017 [Member]
Derivative [Line Items]
Swap interest rate (as a percent)	0.00%	[3]		0.00%	[3]
Basis swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	11,967			11,967			11,967
Basis swap [Member] | Texas Competitive Electric Holdings Company LLC [Member] | October 2012 through October 2014 [Member]
Derivative [Line Items]
Derivative, Notional Amount	11,967			11,967
Debt obligation expiring in 2012 [Member] | Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Derivative [Line Items]
Long-term debt, gross	1,600			1,600
Increase in notional amount of swaps during period [Member] | Interest rate swaps [Member] | Texas Competitive Electric Holdings Company LLC [Member]
Derivative [Line Items]
Change in notional amount of interest rate derivatives				$ 1,280

[1] Includes notional amount of interest rate swaps with maturity dates through October 2014 as well as notional amount of swaps effective from October 2014 with maturity dates through October 2017 (see Note 5).

[2] Swaps related to an aggregate $1.6 billion principal amount of debt expired in 2013. Per the terms of the transactions, the notional amount of swaps entered into in 2011 grew by $1.280 billion in 2013, substantially offsetting the expired swaps.

[3] These swaps are effective from October 2014 through October 2017. The $12.6 billion notional amount of swaps includes $3 billion that expires in October 2015 with the remainder expiring in October 2017.