Decommissioning Trust Funds (Tables)

12 Months Ended

Dec. 31, 2017

Securities Held

The securities held as of December 31, 2017 and 2016 are summarized as follows:

	2017						2016
	Fair Value		Total Unrealized Gains		Total Unrealized Losses		Fair Value		Total Unrealized Gains		Total Unrealized Losses
	(In Millions)
Equity Securities		$4,662		$2,131		$1		$3,511		$1,673		$1
Debt Securities	2,550		44		16		2,213		34		27
Total		$7,212		$2,175		$17		$5,724		$1,707		$28

Available For Sale Securities Continuous Unrealized Loss Position Fair Value

The fair value and gross unrealized losses of available-for-sale equity and debt securities, summarized by investment type and length of time that the securities have been in a continuous loss position, are as follows as of December 31, 2017 and 2016:

	2017								2016
	Equity Securities				Debt Securities				Equity Securities				Debt Securities
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(In Millions)
Less than 12 months		$8		$1		$1,099		$7		$23		$1		$1,169		$26
More than 12 months	—		—		265		9		1		—		20		1
Total		$8		$1		$1,364		$16		$24		$1		$1,189		$27

Fair Value Of Debt Securities By Contractual Maturities

The fair value of debt securities, summarized by contractual maturities, as of December 31, 2017 and 2016 are as follows:

	2017		2016
	(In Millions)
less than 1 year		$74		$125
1 year - 5 years	902		763
5 years - 10 years	812		719
10 years - 15 years	147		109
15 years - 20 years	100		73
20 years+	515		424
Total		$2,550		$2,213

Entergy Arkansas [Member]

Securities Held

The securities held as of December 31, 2017 and 2016 are summarized as follows:

	2017						2016
	Fair Value		Total Unrealized Gains		Total Unrealized Losses		Fair Value		Total Unrealized Gains		Total Unrealized Losses
	(In Millions)
Equity Securities		$596.7		$354.9		$—		$525.4		$281.5		$—
Debt Securities	348.2		2.1		3.0		309.3		3.4		4.2
Total		$944.9		$357.0		$3.0		$834.7		$284.9		$4.2

Available For Sale Securities Continuous Unrealized Loss Position Fair Value

The fair value and gross unrealized losses of available-for-sale equity and debt securities, summarized by investment type and length of time that the securities have been in a continuous loss position, are as follows as of December 31, 2017 and 2016:

	2017								2016
	Equity Securities				Debt Securities				Equity Securities				Debt Securities
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(In Millions)
Less than 12 months		$—		$—		$168.0		$1.2		$—		$—		$146.7		$4.2
More than 12 months	—		—		41.4		1.8		—		—		—		—
Total		$—		$—		$209.4		$3.0		$—		$—		$146.7		$4.2

Fair Value Of Debt Securities By Contractual Maturities

The fair value of debt securities, summarized by contractual maturities, as of December 31, 2017 and 2016 are as follows:

	2017		2016
	(In Millions)
less than 1 year		$13.0		$16.7
1 year - 5 years	123.4		106.2
5 years - 10 years	180.6		161.2
10 years - 15 years	4.8		7.7
15 years - 20 years	3.4		1.0
20 years+	23.0		16.5
Total		$348.2		$309.3

Entergy Louisiana [Member]

Securities Held

The securities held as of December 31, 2017 and 2016 are summarized as follows:

	2017						2016
	Fair Value		Total Unrealized Gains		Total Unrealized Losses		Fair Value		Total Unrealized Gains		Total Unrealized Losses
	(In Millions)
Equity Securities		$818.3		$461.2		$—		$715.9		$346.6		$—
Debt Securities	493.8		10.9		3.6		424.8		8.0		5.0
Total		$1,312.1		$472.1		$3.6		$1,140.7		$354.6		$5.0

Available For Sale Securities Continuous Unrealized Loss Position Fair Value

The fair value and gross unrealized losses of available-for-sale equity and debt securities, summarized by investment type and length of time that the securities have been in a continuous loss position, are as follows as of December 31, 2017 and 2016:

	2017								2016
	Equity Securities				Debt Securities				Equity Securities				Debt Securities
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(In Millions)
Less than 12 months		$—		$—		$135.3		$1.1		$—		$—		$198.8		$4.8
More than 12 months	—		—		84.4		2.5		—		—		4.8		0.2
Total		$—		$—		$219.7		$3.6		$—		$—		$203.6		$5.0

Fair Value Of Debt Securities By Contractual Maturities

The fair value of debt securities, summarized by contractual maturities, as of December 31, 2017 and 2016 are as follows:

	2017		2016
	(In Millions)
less than 1 year		$23.2		$31.4
1 year - 5 years	122.8		99.1
5 years - 10 years	109.3		122.8
10 years - 15 years	52.7		41.4
15 years - 20 years	50.7		30.9
20 years+	135.1		99.2
Total		$493.8		$424.8

System Energy [Member]

Securities Held

The securities held as of December 31, 2017 and 2016 are summarized as follows:

	2017						2016
	Fair Value		Total Unrealized Gains		Total Unrealized Losses		Fair Value		Total Unrealized Gains		Total Unrealized Losses
	(In Millions)
Equity Securities		$575.2		$308.6		$—		$473.9		$221.9		$0.1
Debt Securities	330.5		4.2		1.2		306.6		2.0		4.5
Total		$905.7		$312.8		$1.2		$780.5		$223.9		$4.6

Available For Sale Securities Continuous Unrealized Loss Position Fair Value

The fair value and gross unrealized losses of available-for-sale equity and debt securities, summarized by investment type and length of time that the securities have been in a continuous loss position, are as follows as of December 31, 2017 and 2016:

	2017								2016
	Equity Securities				Debt Securities				Equity Securities				Debt Securities
	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
	(In Millions)
Less than 12 months		$—		$—		$196.9		$1.0		$—		$—		$220.9		$4.4
More than 12 months	—		—		10.4		0.2		—		0.1		0.8		0.1
Total		$—		$—		$207.3		$1.2		$—		$0.1		$221.7		$4.5

Fair Value Of Debt Securities By Contractual Maturities

The fair value of debt securities, summarized by contractual maturities, as of December 31, 2017 and 2016 are as follows:

	2017		2016
	(In Millions)
less than 1 year		$4.1		$6.6
1 year - 5 years	173.0		188.2
5 years - 10 years	78.5		78.5
10 years - 15 years	1.0		1.3
15 years - 20 years	6.9		7.8
20 years+	67.0		24.2
Total		$330.5		$306.6