Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Uncommitted Standby Letter of Credit Facilities to Support MISO Obligations) (Details) - Jun. 30, 2015 - USD ($)	Total
Entergy Louisiana [Member]
Letters of Credit Outstanding, Amount	$ 3,000,000
Entergy Texas [Member]
Letters of Credit Outstanding, Amount	1,300,000
Credit Facility Of Twenty Five Million [Member] | Entergy Arkansas [Member]
Uncommitted Credit Facility	$ 25,000,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 2,000,000
Credit Facility of Seventy Five Million [Member] | Entergy Gulf States [Member]
Uncommitted Credit Facility	$ 75,000,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 16,600,000
Credit Facility of Fifty Million [Member] | Entergy Louisiana [Member]
Uncommitted Credit Facility	$ 50,000,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 1,000,000
Credit Facility of Fifty Million [Member] | Entergy Texas [Member]
Uncommitted Credit Facility	$ 50,000,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 14,500,000
Credit Facility of Forty Million [Member] | Entergy Mississippi [Member]
Uncommitted Credit Facility	40,000,000
Letters of Credit Outstanding, Amount	6,500,000
Credit Facility of Fifteen Million [Member] | Entergy New Orleans [Member]
Uncommitted Credit Facility	$ 15,000,000
Letter of Credit Fee, Percentage	0.75%
Letters of Credit Outstanding, Amount	$ 9,700,000
Minimum [Member] | Credit Facility of Forty Million [Member] | Entergy Mississippi [Member]
Letter of Credit Fee, Percentage	0.70%
Maximum [Member] | Credit Facility of Forty Million [Member] | Entergy Mississippi [Member]
Letter of Credit Fee, Percentage	1.50%