Decommissioning Trust Funds (Securities Held) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Total	$ 1,707.0	$ 1,655.0
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	172.0	201.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5.0	4.0
Total	1,707.0	1,655.0
Entergy Arkansas [Member]
Debt Securities, Available-for-sale [Line Items]
Total	484.8	470.7
Entergy Arkansas [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	62.4	69.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.4	0.2
Total	484.8	470.7
Entergy Louisiana [Member]
Debt Securities, Available-for-sale [Line Items]
Total	753.4	725.1
Entergy Louisiana [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	54.1	67.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3.4	3.5
Total	753.4	725.1
System Energy [Member]
Debt Securities, Available-for-sale [Line Items]
Total	469.1	459.7
System Energy [Member] | Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position	55.1	63.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0.8	0.7
Total	$ 469.1	$ 459.7