Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Apr. 11, 2022	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Equity [Abstract]
Common stock dividend (in dollars per share)			$ 1.01	$ 0.95
Forward Sale Agreement, Aggregate Compensation to Sales Agents [Abstract]
Common Stock, Shares Authorized		499,000,000	499,000,000		499,000,000
Preferred Stock, Shares Authorized		1,000,000	1,000,000		1,000,000
Forward Sale Agreement, Aggregate Compensation to Sales Agents		$ 1.7
Stock Issued During Period, Shares, Treasury Stock Reissued			503,538
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			900,000	1,000,000
Forward Contract Indexed to Issuer's Equity, Shares			1,538,010
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share			$ 108.14
Forward Contract Indexed to Equity, Settlement, Cash, Amount		168.0	$ 168.0
Equity Distribution Program
Equity [Abstract]
Equity Distribution Sales Agreement, Maximum Aggregate Gross Sales Price [Abstract]		1,000.0	$ 1,000.0
Forward Sale Agreement, Aggregate Compensation to Sales Agents [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			1,775,251
Forward Contract Indexed to Equity, Settlement, Cash, Amount		$ 633.0	$ 633.0
System Energy [Member]
Forward Sale Agreement, Aggregate Compensation to Sales Agents [Abstract]
Common Stock, Shares Authorized		1,000,000	1,000,000		1,000,000
Entergy Texas [Member]
Forward Sale Agreement, Aggregate Compensation to Sales Agents [Abstract]
Common Stock, Shares Authorized		200,000,000	200,000,000		200,000,000
Subsequent Event [Member]
Equity [Abstract]
Common stock dividend (in dollars per share)	$ 1.01