Decommissioning Trust Funds (Tables)

12 Months Ended

Dec. 31, 2023

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

The available-for-sale securities held as of December 31, 2023 and 2022 are summarized as follows:

	Fair Value	Total Unrealized Gains	Total Unrealized Losses
	(In Millions)
2023
Debt Securities	$1,770	$19	$134
2022
Debt Securities	$1,655	$4	$201

Investments Classified by Contractual Maturity Date [Table Text Block]

The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2023 and 2022 are as follows:

	2023	2022
	(In Millions)
Less than 1 year	$82	$62
1 year - 5 years	517	520
5 years - 10 years	504	461
10 years - 15 years	121	117
15 years - 20 years	179	161
20 years+	367	334
Total	$1,770	$1,655

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of December 31, 2023 and 2022:

	December 31, 2023		December 31, 2022
	Fair Value	Gross Unrealized Losses	Fair Value	Gross Unrealized Losses
	(In Millions)
Less than 12 months	$134	$6	$840	$63
More than 12 months	999	128	666	138
Total	$1,133	$134	$1,506	$201

Entergy Arkansas [Member]

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

The available-for-sale securities held as of December 31, 2023 and 2022 are summarized as follows:

	Fair Value	Total Unrealized Gains	Total Unrealized Losses
	(In Millions)
2023
Debt Securities	$496.9	$2.4	$53.6
2022
Debt Securities	$470.7	$0.2	$69.3

Investments Classified by Contractual Maturity Date [Table Text Block]

The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2023 and 2022 are as follows:

	2023	2022
	(In Millions)
Less than 1 year	$45.3	$21.2
1 year - 5 years	132.2	159.7
5 years - 10 years	205.7	191.7
10 years - 15 years	39.9	38.0
15 years - 20 years	49.6	42.6
20 years+	24.2	17.5
Total	$496.9	$470.7

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of December 31, 2023 and 2022:

	December 31, 2023		December 31, 2022
	Fair Value	Gross Unrealized Losses	Fair Value	Gross Unrealized Losses
	(In Millions)
Less than 12 months	$22.5	$0.4	$197.6	$18.8
More than 12 months	403.4	53.2	260.1	50.5
Total	$425.9	$53.6	$457.7	$69.3

Entergy Louisiana [Member]

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

The available-for-sale securities held as of December 31, 2023 and 2022 are summarized as follows:

	Fair Value	Total Unrealized Gains	Total Unrealized Losses
	(In Millions)
2023
Debt Securities	$788.1	$11.7	$37.4
2022
Debt Securities	$725.1	$3.5	$67.5

Investments Classified by Contractual Maturity Date [Table Text Block]

The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2023 and 2022 are as follows:

	2023	2022
	(In Millions)
Less than 1 year	$31.4	$33.6
1 year - 5 years	181.6	159.1
5 years - 10 years	170.0	161.7
10 years - 15 years	70.2	67.1
15 years - 20 years	90.2	83.3
20 years+	244.7	220.3
Total	$788.1	$725.1

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of December 31, 2023 and 2022:

	December 31, 2023		December 31, 2022
	Fair Value	Gross Unrealized Losses	Fair Value	Gross Unrealized Losses
	(In Millions)
Less than 12 months	$69.8	$0.9	$409.9	$24.6
More than 12 months	356.1	36.5	207.5	42.9
Total	$425.9	$37.4	$617.4	$67.5

System Energy [Member]

Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]

The available-for-sale securities held as of December 31, 2023 and 2022 are summarized as follows:

	Fair Value	Total Unrealized Gains	Total Unrealized Losses
	(In Millions)
2023
Debt Securities	$485.2	$4.5	$42.5
2022
Debt Securities	$459.7	$0.7	$63.7

Investments Classified by Contractual Maturity Date [Table Text Block]

The fair value of available-for-sale debt securities, summarized by contractual maturities, as of December 31, 2023 and 2022 are as follows:

	2023	2022
	(In Millions)
Less than 1 year	$5.3	$6.8
1 year - 5 years	203.4	201.7
5 years - 10 years	128.6	107.1
10 years - 15 years	10.7	11.7
15 years - 20 years	38.8	35.0
20 years+	98.4	97.4
Total	$485.2	$459.7

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

The fair value and gross unrealized losses of available-for-sale debt securities, summarized by length of time that the securities had been in a continuous loss position, were as follows as of December 31, 2023 and 2022:

	December 31, 2023		December 31, 2022
	Fair Value	Gross Unrealized Losses	Fair Value	Gross Unrealized Losses
	(In Millions)
Less than 12 months	$42.1	$4.5	$231.9	$19.2
More than 12 months	239.1	38.0	198.0	44.5
Total	$281.2	$42.5	$429.9	$63.7