Transactions With Affiliates (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
RS Cogen [Member]
Intercompany operating expenses	$ 3.2		$ 2.8		$ 41.1
Entergy Arkansas [Member]
Intercompany revenues	349.9		324.0		293.8
Intercompany operating expenses	656.1	[1]	580.7	[1]	752.7	[1]
Intercompany interest and investment income	0		0		0.1
Entergy Arkansas [Member] | Entergy Power [Member]
Intercompany operating expenses	3.3		1.4		1.2
Entergy Gulf States Louisiana [Member]
Intercompany revenues	383.1		380.6		574.5
Intercompany operating expenses	672.8	[2]	532.3	[2]	563.1	[2]
Intercompany interest and investment income	27.5		28.2		32.5
Entergy Gulf States Louisiana [Member] | RS Cogen [Member]
Intercompany operating expenses	3.2		2.8		41.1
Entergy Louisiana [Member]
Intercompany revenues	114.9		138.2		139.0
Intercompany operating expenses	667.6	[3]	597.4	[3]	574.0	[3]
Intercompany interest and investment income	78.2		78.2		78.1
Entergy Louisiana [Member] | Entergy Power [Member]
Intercompany operating expenses	8.1		14.3		14.5
Entergy Mississippi [Member]
Intercompany revenues	107.3		36.1		125.1
Intercompany operating expenses	399.0		352.7		337.2
Intercompany interest and investment income	0		0		0.1
Entergy New Orleans [Member]
Intercompany revenues	27.0		43.9		96.9
Intercompany operating expenses	279.6	[4]	247.2	[4]	226.6	[4]
Intercompany interest and investment income	0		0		0.1
Entergy New Orleans [Member] | Entergy Power [Member]
Intercompany operating expenses	8.0		14.1		14.2
Entergy Texas [Member]
Intercompany revenues	369.4		313.2		264.1
Intercompany operating expenses	418.1		386.1		486.6
Intercompany interest and investment income	0		0.1		0
System Energy [Member]
Intercompany revenues	735.1		622.1		563.4
Intercompany operating expenses	175.2		147.4		131.5
Intercompany interest and investment income	$ 0		$ 0		$ 0.6

[1] Includes $3.3 million in 2013, $1.4 million in 2012, and $1.2 million in 2011 for power purchased from Entergy Power.

[2] Includes power purchased from RS Cogen of $3.2 million in 2013, $2.8 million in 2012, and $41.1 million in 2011.

[3] Includes power purchased from Entergy Power of $8.1 million in 2013, $14.3 million in 2012, and $14.5 million in 2011.

[4] Includes power purchased from Entergy Power of $8.0 million in 2013, $14.1 million in 2012, and $14.2 million in 2011.