Preferred Equity (Schedule Of Number Of Shares And Units Authorized And Outstanding And Dollar Value Of Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					9 Months Ended	12 Months Ended
	Sep. 30, 2019	Nov. 30, 2018	Nov. 30, 2017	Oct. 31, 2015	Dec. 31, 2013	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Payments for Repurchase of Preferred Stock and Preference Stock							$ 0	$ 50,000	$ 53,868
Stockholders' Equity Attributable to Noncontrolling Interest							35,000	35,000
Temporary Equity, Carrying Amount, Attributable to Parent							$ 219,410	219,410
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs								$ 7	728
Entergy Texas [Member]
Preferred Shares/Units, Outstanding							1,400,000	1,400,000
Stockholders' Equity Attributable to Noncontrolling Interest							$ 35,000	$ 35,000
Temporary Equity, Carrying Amount, Attributable to Parent							$ 35,000	$ 35,000
Preferred Units, Authorized							1,400,000	1,400,000
Entergy Mississippi [Member]
Payments for Repurchase of Preferred Stock and Preference Stock							$ 0	$ 0	$ 21,208
Entergy Corporation [Member]
Preferred Stock, Shares Authorized							1,850,000	1,850,000
Temporary Equity, Shares Outstanding							1,850,000	1,850,000
Temporary Equity, Carrying Amount, Attributable to Parent							$ 254,410	$ 254,410
Utility [Member]
Preferred Shares/Units, Outstanding							1,600,000	1,600,000
Temporary Equity, Carrying Amount, Attributable to Parent							$ 230,161	$ 230,161
Preferred Units, Authorized							1,600,000	1,600,000
Preferred Stock, 8.75% Rate [Member] | Entergy Finance Holding Inc [Member]
Preferred Stock, Shares Authorized					250,000		250,000	250,000
Temporary Equity, Shares Outstanding							250,000	250,000
Temporary Equity, Carrying Amount, Attributable to Parent							$ 24,249	$ 24,249
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs							$ 751
Preferred Stock, Dividend Rate, Percentage					8.75%		8.75%
Preferred Stock, Cumulative One Thousand Dollar Par Value, Seven Point Five Percent Series [Member] | Entergy Utility Holding Company LLC [Member]
Preferred Shares/Units, Outstanding							110,000	110,000
Temporary Equity, Carrying Amount, Attributable to Parent							$ 107,425	$ 107,425
Preferred Units, Authorized				110,000			110,000	110,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs							$ 2,575
Preferred Stock, Dividend Rate, Percentage				7.50%			7.50%
Preferred Stock, Cumulative $1,000 Par Value 6.25% Series [Domain] | Entergy Utility Holding Company LLC [Member]
Preferred Shares/Units, Outstanding							15,000	15,000
Temporary Equity, Carrying Amount, Attributable to Parent							$ 14,366	$ 14,366
Preferred Units, Authorized			15,000				15,000	15,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs							$ 634
Preferred Stock, Dividend Rate, Percentage			6.25%				6.25%
Preferred Stock, Cumulative $1,000 Par Value 6.75% Series [Domain] | Entergy Utility Holding Company LLC [Member]
Preferred Shares/Units, Outstanding							75,000	75,000
Temporary Equity, Carrying Amount, Attributable to Parent							$ 73,370	$ 73,370
Preferred Units, Authorized		75,000					75,000	75,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs							$ 1,630
Preferred Stock, Dividend Rate, Percentage		6.75%					6.75%
Preferred Stock, Five Point Three Seven Five Percent, Series A [Member] | Entergy Texas [Member]
Preferred Shares/Units, Outstanding							1,400,000	1,400,000
Stockholders' Equity Attributable to Noncontrolling Interest							$ 35,000	$ 35,000
Preferred Units, Authorized							1,400,000	1,400,000
Preferred Stock, Dividend Rate, Percentage	5.375%
Preferred Stock, Five Point Three Seven Five Percent, Series A [Member] [Domain] | Entergy Texas [Member]
Preferred Stock, Shares Authorized	1,400,000					1,400,000
Preferred Stock, Dividend Rate, Percentage	5.375%
Preferred Stock, Five Point Three Seven Five Percent, Series A [Member] | Entergy Texas [Member]
Preferred Stock, Call Price per Share							$ 0
Preferred Shares/Units, Outstanding							1,400,000	1,400,000
Preferred Stock, Liquidation Preference Per Share	$ 25					$ 25	$ 25
Temporary Equity, Carrying Amount, Attributable to Parent							$ 35,000	$ 35,000
Preferred Units, Authorized							1,400,000	1,400,000
Preferred Stock, Value, Issued	$ 35,000					$ 35,000
Preferred Stock, Dividend Rate, Percentage						5.375%