Decommissioning Trust Funds (Schedule of Realized Gain (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Proceeds from Sale of Debt Securities, Available-for-sale	$ 209,000	$ 227,000	$ 368,000	$ 489,000
Debt Securities, Available-for-Sale, Realized Gain	1,000	1,000	2,000	2,000
Debt Securities, Available-for-Sale, Realized Loss	6,000	4,000	8,000	8,000
System Energy [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	87,700	155,300	166,700	307,600
Debt Securities, Available-for-Sale, Realized Gain	300	800	600	1,300
Debt Securities, Available-for-Sale, Realized Loss	1,400	1,400	2,100	4,000
Entergy Louisiana [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	113,900	71,500	189,600	181,500
Debt Securities, Available-for-Sale, Realized Gain	200	100	600	200
Debt Securities, Available-for-Sale, Realized Loss	4,600	2,400	6,100	4,000
Entergy Arkansas [Member]
Proceeds from Sale of Debt Securities, Available-for-sale	7,200	0	11,000	0
Debt Securities, Available-for-Sale, Realized Gain	$ 100	$ 0	$ 100	$ 0

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-11

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