Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2011

Asset Retirement Obligations [Abstract]

Difference between estimated incurred removal costs and estimated removal costs recovered in rates

	December 31,
	2011			2010
	(In Millions)
Entergy Arkansas	($	16.4	)	($	24.0	)
Entergy Gulf States Louisiana	($	30.3	)	($	24.9	)
Entergy Louisiana	($	62.6	)	($	52.9	)
Entergy Mississippi	$	48.5		$	46.1
Entergy New Orleans	$	16.3		$	15.4
Entergy Texas	$	4.5		$	7.3
System Energy	$	11.8		$	12.2

Cumulative decommissioning and retirement cost liabilities and expenses

The cumulative decommissioning and retirement cost liabilities and expenses recorded in 2011 by Entergy were as follows:

	Liabilities as of December 31, 2010		Accretion		Change in Cash  Flow Estimate			Spending			Liabilities as of December 31, 2011
	(In Millions)
Utility:
Entergy Arkansas	$	602.2	$	38.0	$	—		$	—		$	640.2
Entergy Gulf States Louisiana	$	339.9	$	19.9	$	—		$	—		$	359.8
Entergy Louisiana	$	321.2	$	24.6	$	—		$	—		$	345.8
Entergy Mississippi	$	5.4	$	0.3	$	—		$	—		$	5.7
Entergy New Orleans	$	3.4	$	0.2	$	—		($	0.7	)	$	2.9
Entergy Texas	$	3.6	$	0.3	$	—		$	—		$	3.9
System Energy	$	452.8	$	31.5	($	38.9	)	$	—		$	445.4
Entergy Wholesale Commodities	$	1,420.0	$	115.6	($	34.1	)	($	8.6	)	$	1,492.9

The cumulative decommissioning and retirement cost liabilities and expenses recorded in 2010 by Entergy were as follows:

	Liabilities as of December 31, 2009		Accretion		Change in Cash  Flow Estimate		Spending			Liabilities as of December 31, 2010
	(In Millions)
Utility:
Entergy Arkansas	$	566.4	$	35.8	$	—	$	—		$	602.2
Entergy Gulf States Louisiana	$	321.2	$	18.7	$	—	$	—		$	339.9
Entergy Louisiana	$	298.2	$	23.0	$	—	$	—		$	321.2
Entergy Mississippi	$	5.1	$	0.3	$	—	$	—		$	5.4
Entergy New Orleans	$	3.2	$	0.2	$	—	$	—		$	3.4
Entergy Texas	$	3.4	$	0.2	$	—	$	—		$	3.6
System Energy	$	421.4	$	31.4	$	—	$	—		$	452.8
Entergy Wholesale Commodities	$	1,320.6	$	107.6	$	—	($	8.2	)	$	1,420.0

Fair values of decommissioning trust funds and related asset retirement obligation regulatory assets

	Decommissioning Trust Fair Values		Regulatory Asset
	(In Millions)
Utility:
ANO 1 and ANO 2	$	541.7	$	181.5
River Bend	$	420.9	$	5.5
Waterford 3	$	254.0	$	116.1
Grand Gulf	$	423.4	$	59.6
Entergy Wholesale Commodities	$	2,148.0	$	—

The fair values of the decommissioning trust funds and the related asset retirement obligation regulatory assets of Entergy as of December 31, 2010 are as follows:

	Decommissioning Trust Fair Values		Regulatory Asset
	(In Millions)
Utility:
ANO 1 and ANO 2	$	520.8	$	161.4
River Bend	$	393.6	$	10.9
Waterford 3	$	240.5	$	104.2
Grand Gulf	$	387.9	$	98.3
Entergy Wholesale Commodities	$	2,052.9	$	—