Preferred Equity (Narratives) (Details) - USD ($)	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
Preferred Equity [Line Items]
Payments for Repurchase of Preferred Stock and Preference Stock							$ 0	$ 50,000,000	$ 53,868,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs								7,000	728,000
Entergy Arkansas [Member]
Preferred Equity [Line Items]
Payments for Repurchase of Preferred Stock and Preference Stock							$ 0	$ 0	32,660,000
Entergy Texas [Member]
Preferred Equity [Line Items]
Preferred Units, Authorized							1,400,000	1,400,000
Entergy Mississippi [Member]
Preferred Equity [Line Items]
Payments for Repurchase of Preferred Stock and Preference Stock							$ 0	$ 0	$ 21,208,000
Preferred Stock, 8.75% Rate [Member] | Entergy Finance Holding Inc [Member]
Preferred Equity [Line Items]
Preferred stock/preferred membership interests rate					8.75%		8.75%
Preferred Stock, Shares Authorized					250,000		250,000	250,000
Temporary Equity, Par Value					$ 100
Temporary Equity, Redemption Price Per Share							$ 100
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs							$ 751,000
Preferred Stock, Cumulative $1,000 Par Value 6.75% Series [Domain] | Entergy Utility Holding Company LLC [Member]
Preferred Equity [Line Items]
Preferred stock/preferred membership interests rate		6.75%					6.75%
Temporary Equity, Par Value		$ 1,000
Temporary Equity, Redemption Price Per Share							$ 1,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs							$ 1,630,000
Preferred Units, Authorized		75,000					75,000	75,000
Preferred Stock, Cumulative One Thousand Dollar Par Value, Seven Point Five Percent Series [Member] | Entergy Utility Holding Company LLC [Member]
Preferred Equity [Line Items]
Preferred stock/preferred membership interests rate				7.50%			7.50%
Temporary Equity, Par Value				$ 1,000
Temporary Equity, Redemption Price Per Share							$ 1,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs							$ 2,575,000
Preferred Units, Authorized				110,000			110,000	110,000
Preferred Stock, Cumulative $1,000 Par Value 6.25% Series [Domain] | Entergy Utility Holding Company LLC [Member]
Preferred Equity [Line Items]
Preferred stock/preferred membership interests rate			6.25%				6.25%
Temporary Equity, Par Value			$ 1,000
Temporary Equity, Redemption Price Per Share							$ 1,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs							$ 634,000
Preferred Units, Authorized			15,000				15,000	15,000
Preferred Stock, Five Point Three Seven Five Percent, Series A [Member] [Domain] | Entergy Texas [Member]
Preferred Equity [Line Items]
Preferred stock/preferred membership interests rate	5.375%
Preferred Stock, Shares Authorized	1,400,000					1,400,000
Preferred Stock, Five Point Three Seven Five Percent, Series A [Member] | Entergy Texas [Member]
Preferred Equity [Line Items]
Preferred Stock, Value, Issued	$ 35,000,000					$ 35,000,000
Preferred stock/preferred membership interests rate						5.375%
Preferred Units, Authorized							1,400,000	1,400,000
Preferred Stock, Liquidation Preference Per Share	$ 25					$ 25	$ 25