Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Uncommitted Standby Letter of Credit Facilities to Support MISO Obligations) (Details) - USD ($)	Oct. 01, 2015	Sep. 30, 2015
Entergy Louisiana [Member]
Letters of Credit Outstanding, Amount		$ 3,000,000
Entergy Louisiana [Member] | Subsequent Event [Member]
Uncommitted Credit Facility	$ 125,000,000
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		$ 1,000,000
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		$ 28,300,000
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		$ 31,000,000
Credit Facility of Forty Million [Member] | Entergy Mississippi [Member]
Uncommitted Credit Facility		40,000,000
Letters of Credit Outstanding, Amount		11,200,000
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		$ 4,400,000
Minimum [Member] | Credit Facility of Forty Million [Member] | Entergy Mississippi [Member]
Letter of Credit Fee, Percentage		0.70%