Long-Term Debt (Details) (USD $)	Sep. 30, 2012	Sep. 15, 2005 Class A-1 Tranche [Member]	Mar. 15, 2005 Class A-1 Tranche [Member]	Sep. 15, 2004 Class A-1 Tranche [Member]	Mar. 15, 2004 Class A-1 Tranche [Member]	Sep. 15, 2003 Class A-1 Tranche [Member]	Mar. 15, 2003 Class A-1 Tranche [Member]	Sep. 15, 2002 Class A-1 Tranche [Member]	Mar. 15, 2002 Class A-1 Tranche [Member]	Sep. 15, 2007 Class A-2 Tranche [Member]	Mar. 15, 2007 Class A-2 Tranche [Member]	Sep. 15, 2006 Class A-2 Tranche [Member]	Mar. 15, 2006 Class A-2 Tranche [Member]	Sep. 15, 2005 Class A-2 Tranche [Member]	Sep. 15, 2009 Class A-3 Tranche [Member]	Mar. 15, 2009 Class A-3 Tranche [Member]	Sep. 15, 2008 Class A-3 Tranche [Member]	Mar. 15, 2008 Class A-3 Tranche [Member]	Sep. 15, 2007 Class A-3 Tranche [Member]	Sep. 15, 2012 Class A-4 Tranche [Member]	Mar. 15, 2012 Class A-4 Tranche [Member]	Sep. 15, 2011 Class A-4 Tranche [Member]	Mar. 15, 2011 Class A-4 Tranche [Member]	Sep. 15, 2010 Class A-4 Tranche [Member]	Mar. 15, 2010 Class A-4 Tranche [Member]	Sep. 15, 2009 Class A-4 Tranche [Member]
Debt Instrument [Line Items]
Principal Payment, Scheduled		$ 26,068,000	$ 15,914,000	$ 27,185,000	$ 14,004,000	$ 12,357,000	$ 6,366,000	$ 13,106,000	$ 0	$ 38,512,000	$ 20,370,000	$ 35,835,000	$ 18,460,000	$ 4,824,000	$ 38,615,000	$ 24,826,000	$ 43,249,000	$ 22,280,000	$ 1,030,000	$ 65,491,000	$ 33,738,000	$ 58,077,000	$ 29,918,000	$ 53,135,000	$ 27,372,000	$ 9,576,000
Principal Payment, Actual		26,068,000	15,914,000	27,185,000	14,004,000	12,357,000	6,366,000	13,106,000	0	38,512,000	20,370,000	35,835,000	18,460,000	4,824,000	38,615,000	24,826,000	43,249,000	22,280,000	1,030,000	65,491,000	33,738,000	58,077,000	29,918,000	53,135,000	27,372,000	9,576,000
Long-term Debt	$ 108,600,000
Debt Instrument, Interest Rate, Stated Percentage	5.63%

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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CENTERPOINT ENERGY TRANSITION BOND CO LLC 10-Q