Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 30, 2015	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Stock Options Excluded From Diluted Common Shares Outstanding Calculation			7,400,000	5,200,000	7,400,000	6,600,000
Treasury Stock, Shares, Acquired					1,468,984
Treasury Stock, Value, Acquired, Cost Method					$ 99.8
Common stock dividend (in dollars per share)			$ 0.83	$ 0.83	$ 2.49	$ 2.49
Parent Company [Member]
Equity [Abstract]
Shares, Issued		615,075	615,075		615,075
Entergy Louisiana [Member] | Preferred Membership Interests Six Point Nine Five Series [Member]
Equity [Abstract]
Redemption of Preferred Equity		$ 100.0
Preferred Stock, Dividend Rate, Percentage		6.95%
Entergy Gulf States Louisiana [Member] | Preferred Membership Interest Series A Eight Point Two Five [Member]
Equity [Abstract]
Cancellation of Preferred Equity		$ 10.0
Preferred Stock, Dividend Rate, Percentage		8.25%
Subsequent Event [Member]
Equity [Abstract]
Common stock dividend (in dollars per share)	$ 0.85