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Decommissioning Trust Funds (Tables) | 3 Months Ended
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Mar. 31, 2016
Securities Held | The securities held as of March 31, 2016 and December 31, 2015 are summarized as follows:
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2016 |  |  |  |  |  |
Equity Securities |  |  | $3,203 |  |  |  | $1,638 |  |  |  | $1 |
Debt Securities |  | 2,249 |  |  | 78 |  |  | 4 |
Total |  |  | $5,452 |  |  |  | $1,716 |  |  |  | $5 |
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2015 |  |  |  |  |  |
Equity Securities |  |  | $3,195 |  |  |  | $1,396 |  |  |  | $2 |
Debt Securities |  | 2,155 |  |  | 41 |  |  | 17 |
Total |  |  | $5,350 |  |  |  | $1,437 |  |  |  | $19 |
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 March 31, 2016:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $38 |  |  |  | $1 |  |  |  | $196 |  |  |  | $2 |
More than 12 months | — |  |  | — |  |  | 73 |  |  | 2 |
Total |  | $38 |  |  |  | $1 |  |  |  | $269 |  |  |  | $4 |
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, 2015:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $54 |  |  |  | $2 |  |  |  | $1,031 |  |  |  | $15 |
More than 12 months | 1 |  |  | — |  |  | 61 |  |  | 2 |
Total |  | $55 |  |  |  | $2 |  |  |  | $1,092 |  |  |  | $17 |
Fair Value Of Debt Securities By Contractual Maturities | The fair value of debt securities, summarized by contractual maturities, as of March 31, 2016 and December 31, 2015 are as follows:
| 2016 |  | 2015
| (In Millions)
less than 1 year |  | $98 |  |  |  | $77 |
1 year - 5 years | 855 |  |  | 857 |
5 years - 10 years | 711 |  |  | 704 |
10 years - 15 years | 144 |  |  | 124 |
15 years - 20 years | 58 |  |  | 50 |
20 years+ | 383 |  |  | 343 |
Total |  | $2,249 |  |  |  | $2,155 |
Entergy Arkansas [Member] |
Securities Held | Entergy Arkansas holds debt and equity securities, classified as available-for-sale, in nuclear decommissioning trust accounts. The securities held as of March 31, 2016 and December 31, 2015 are summarized as follows:
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2016 |  |  |  |  |  |
Equity Securities |  |  | $474.3 |  |  |  | $238.5 |  |  |  | $0.2 |
Debt Securities |  | 311.2 |  |  | 9.5 |  |  | 0.8 |
Total |  |  | $785.5 |  |  |  | $248.0 |  |  |  | $1.0 |
2015 |  |  |  |  |  |
Equity Securities |  |  | $467.4 |  |  |  | $234.4 |  |  |  | $0.2 |
Debt Securities |  | 303.9 |  |  | 4.1 |  |  | 2.2 |
Total |  |  | $771.3 |  |  |  | $238.5 |  |  |  | $2.4 |
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 March 31, 2016:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $7.3 |  |  |  | $0.2 |  |  |  | $18.1 |  |  |  | $0.4 |
More than 12 months | — |  |  | — |  |  | 11.3 |  |  | 0.4 |
Total |  | $7.3 |  |  |  | $0.2 |  |  |  | $29.4 |  |  |  | $0.8 |
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, 2015:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $7.8 |  |  |  | $0.2 |  |  |  | $111.4 |  |  |  | $1.7 |
More than 12 months | — |  |  | — |  |  | 18.5 |  |  | 0.5 |
Total |  | $7.8 |  |  |  | $0.2 |  |  |  | $129.9 |  |  |  | $2.2 |
Fair Value Of Debt Securities By Contractual Maturities | The fair value of debt securities, summarized by contractual maturities, as of March 31, 2016 and December 31, 2015 are as follows:
| 2016 |  | 2015
| (In Millions)
less than 1 year |  | $3.7 |  |  |  | $1.8 |
1 year - 5 years | 142.0 |  |  | 145.2 |
5 years - 10 years | 138.4 |  |  | 138.5 |
10 years - 15 years | 7.5 |  |  | 2.4 |
15 years - 20 years | 2.1 |  |  | 2.0 |
20 years+ | 17.5 |  |  | 14.0 |
Total |  | $311.2 |  |  |  | $303.9 |
Entergy Louisiana [Member] |
Securities Held | Entergy Louisiana holds debt and equity securities, classified as available-for-sale, in nuclear decommissioning trust accounts. The securities held as of March 31, 2016 and December 31, 2015 are summarized as follows:
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2016 |  |  |  |  |  |
Equity Securities |  |  | $643.0 |  |  |  | $289.3 |  |  |  | $0.1 |
Debt Securities |  | 422.2 |  |  | 19.0 |  |  | 0.8 |
Total |  |  | $1,065.2 |  |  |  | $308.3 |  |  |  | $0.9 |
2015 |  |  |  |  |  |
Equity Securities |  |  | $632.4 |  |  |  | $283.7 |  |  |  | $0.2 |
Debt Securities |  | 409.9 |  |  | 13.2 |  |  | 2.4 |
Total |  |  | $1,042.3 |  |  |  | $296.9 |  |  |  | $2.6 |
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 March 31, 2016:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $8.6 |  |  |  | $0.1 |  |  |  | $24.0 |  |  |  | $0.3 |
More than 12 months | — |  |  | — |  |  | 11.0 |  |  | 0.5 |
Total |  | $8.6 |  |  |  | $0.1 |  |  |  | $35.0 |  |  |  | $0.8 |
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, 2015:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $9.4 |  |  |  | $0.2 |  |  |  | $124.0 |  |  |  | $2.0 |
More than 12 months | — |  |  | — |  |  | 7.4 |  |  | 0.4 |
Total |  | $9.4 |  |  |  | $0.2 |  |  |  | $131.4 |  |  |  | $2.4 |
Fair Value Of Debt Securities By Contractual Maturities | The fair value of debt securities, summarized by contractual maturities, as of March 31, 2016 and December 31, 2015 are as follows:
| 2016 |  | 2015
| (In Millions)
less than 1 year |  | $31.9 |  |  |  | $27.1 |
1 year - 5 years | 114.8 |  |  | 124.0 |
5 years - 10 years | 121.2 |  |  | 114.3 |
10 years - 15 years | 43.6 |  |  | 39.3 |
15 years - 20 years | 29.7 |  |  | 26.5 |
20 years+ | 81.0 |  |  | 78.7 |
Total |  | $422.2 |  |  |  | $409.9 |
System Energy [Member] |
Securities Held | System Energy holds debt and equity securities, classified as available-for-sale, in nuclear decommissioning trust accounts. The securities held as of March 31, 2016 and December 31, 2015 are summarized as follows:
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2016 |  |  |  |  |  |
Equity Securities |  |  | $428.4 |  |  |  | $182.7 |  |  |  | $0.1 |
Debt Securities |  | 291.4 |  |  | 5.5 |  |  | 0.4 |
Total |  |  | $719.8 |  |  |  | $188.2 |  |  |  | $0.5 |
2015 |  |  |  |  |  |
Equity Securities |  |  | $423.7 |  |  |  | $179.2 |  |  |  | $0.3 |
Debt Securities |  | 277.8 |  |  | 2.2 |  |  | 2.3 |
Total |  |  | $701.5 |  |  |  | $181.4 |  |  |  | $2.6 |
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 March 31, 2016:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $3.9 |  |  |  | $0.1 |  |  |  | $45.8 |  |  |  | $0.3 |
More than 12 months | — |  |  | — |  |  | 2.4 |  |  | 0.1 |
Total |  | $3.9 |  |  |  | $0.1 |  |  |  | $48.2 |  |  |  | $0.4 |
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, 2015:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $8.3 |  |  |  | $0.2 |  |  |  | $200.4 |  |  |  | $2.2 |
More than 12 months | 0.9 |  |  | 0.1 |  |  | 5.0 |  |  | 0.1 |
Total |  | $9.2 |  |  |  | $0.3 |  |  |  | $205.4 |  |  |  | $2.3 |
Fair Value Of Debt Securities By Contractual Maturities | The fair value of debt securities, summarized by contractual maturities, as of March 31, 2016 and December 31, 2015 are as follows:
| 2016 |  | 2015
| (In Millions)
less than 1 year |  | $4.6 |  |  |  | $2.0 |
1 year - 5 years | 180.9 |  |  | 181.2 |
5 years - 10 years | 73.3 |  |  | 63.0 |
10 years - 15 years | 4.5 |  |  | 4.4 |
15 years - 20 years | 1.5 |  |  | 1.6 |
20 years+ | 26.6 |  |  | 25.6 |
Total |  | $291.4 |  |  |  | $277.8 |

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