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Decommissioning Trust Funds (Tables) | 3 Months Ended
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Mar. 31, 2018
Securities Held | The available-for-sale securities held as of March 31, 2018 and December 31, 2017 are summarized as follows:
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2018 |  |  |  |  |  |
Debt Securities |  | 2,619 |  |  | 23 |  |  | 48 |
2017 |  |  |  |  |  |
Equity Securities |  |  | $4,662 |  |  |  | $2,131 |  |  |  | $1 |
Debt Securities |  | 2,550 |  |  | 44 |  |  | 16 |
Total |  |  | $7,212 |  |  |  | $2,175 |  |  |  | $17 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value | The fair value and gross unrealized losses of the available-for-sale 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, 2018:
|  | Debt Securities
|  | Fair Value |  | Gross Unrealized Losses
|  | (In Millions)
Less than 12 months |  |  | $1,667 |  |  |  | $35 |
More than 12 months |  | 241 |  |  | 13 |
Total |  |  | $1,908 |  |  |  | $48 |
The fair value and gross unrealized losses of available-for-sale 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:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $8 |  |  |  | $1 |  |  |  | $1,099 |  |  |  | $7 |
More than 12 months | — |  |  | — |  |  | 265 |  |  | 9 |
Total |  | $8 |  |  |  | $1 |  |  |  | $1,364 |  |  |  | $16 |
Fair Value Of Debt Securities By Contractual Maturities | The fair value of debt securities, summarized by contractual maturities, as of March 31, 2018 and December 31, 2017 are as follows:
| 2018 |  | 2017
| (In Millions)
less than 1 year |  | $89 |  |  |  | $74 |
1 year - 5 years | 928 |  |  | 902 |
5 years - 10 years | 784 |  |  | 812 |
10 years - 15 years | 152 |  |  | 147 |
15 years - 20 years | 101 |  |  | 100 |
20 years+ | 565 |  |  | 515 |
Total |  | $2,619 |  |  |  | $2,550 |
Entergy Arkansas [Member] |
Securities Held | Entergy Arkansas holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. The available-for-sale securities held as of March 31, 2018 and December 31, 2017 are summarized as follows:
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2018 |  |  |  |  |  |
Debt Securities |  | 350.8 |  |  | 0.5 |  |  | 9.7 |
2017 |  |  |  |  |  |
Equity Securities |  |  | $596.7 |  |  |  | $354.9 |  |  |  | $— |
Debt Securities |  | 348.2 |  |  | 2.1 |  |  | 3.0 |
Total |  |  | $944.9 |  |  |  | $357.0 |  |  |  | $3.0 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value | The fair value and gross unrealized losses of the available-for-sale 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, 2018:
|  | Debt Securities
|  | Fair Value |  | Gross Unrealized Losses
|  | (In Millions)
Less than 12 months |  |  | $277.8 |  |  |  | $7.2 |
More than 12 months |  | 42.5 |  |  | 2.5 |
Total |  |  | $320.3 |  |  |  | $9.7 |
The fair value and gross unrealized losses of the available-for-sale 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:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $— |  |  |  | $— |  |  |  | $168.0 |  |  |  | $1.2 |
More than 12 months | — |  |  | — |  |  | 41.4 |  |  | 1.8 |
Total |  | $— |  |  |  | $— |  |  |  | $209.4 |  |  |  | $3.0 |
Fair Value Of Debt Securities By Contractual Maturities | The fair value of debt securities, summarized by contractual maturities, as of March 31, 2018 and December 31, 2017 are as follows:
| 2018 |  | 2017
| (In Millions)
less than 1 year |  | $14.1 |  |  |  | $13.0 |
1 year - 5 years | 130.6 |  |  | 123.4 |
5 years - 10 years | 177.9 |  |  | 180.6 |
10 years - 15 years | 3.4 |  |  | 4.8 |
15 years - 20 years | 7.0 |  |  | 3.4 |
20 years+ | 17.8 |  |  | 23.0 |
Total |  | $350.8 |  |  |  | $348.2 |
Entergy Louisiana [Member] |
Securities Held | Entergy Louisiana holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. The available-for-sale securities held as of March 31, 2018 and December 31, 2017 are summarized as follows:
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2018 |  |  |  |  |  |
Debt Securities |  | 516.3 |  |  | 5.7 |  |  | 8.4 |
2017 |  |  |  |  |  |
Equity Securities |  |  | $818.3 |  |  |  | $461.2 |  |  |  | $— |
Debt Securities |  | 493.8 |  |  | 10.9 |  |  | 3.6 |
Total |  |  | $1,312.1 |  |  |  | $472.1 |  |  |  | $3.6 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value | The fair value and gross unrealized losses of the available-for-sale 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, 2018:
|  | Debt Securities
|  | Fair Value |  | Gross Unrealized Losses
|  | (In Millions)
Less than 12 months |  |  | $254.9 |  |  |  | $4.6 |
More than 12 months |  | 78.8 |  |  | 3.8 |
Total |  |  | $333.7 |  |  |  | $8.4 |
The fair value and gross unrealized losses of the available-for-sale 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:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $— |  |  |  | $— |  |  |  | $135.3 |  |  |  | $1.1 |
More than 12 months | — |  |  | — |  |  | 84.4 |  |  | 2.5 |
Total |  | $— |  |  |  | $— |  |  |  | $219.7 |  |  |  | $3.6 |
Fair Value Of Debt Securities By Contractual Maturities | The fair value of debt securities, summarized by contractual maturities, as of March 31, 2018 and December 31, 2017 are as follows:
| 2018 |  | 2017
| (In Millions)
less than 1 year |  | $28.1 |  |  |  | $23.2 |
1 year - 5 years | 136.7 |  |  | 122.8 |
5 years - 10 years | 108.4 |  |  | 109.3 |
10 years - 15 years | 52.9 |  |  | 52.7 |
15 years - 20 years | 44.7 |  |  | 50.7 |
20 years+ | 145.5 |  |  | 135.1 |
Total |  | $516.3 |  |  |  | $493.8 |
System Energy [Member] |
Securities Held | System Energy holds equity securities and available-for-sale debt securities in nuclear decommissioning trust accounts. The available-for-sale securities held as of March 31, 2018 and December 31, 2017 are summarized as follows:
|  | Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
|  | (In Millions)
2018 |  |  |  |  |  |
Debt Securities |  | 325.6 |  |  | 1.4 |  |  | 5.8 |
2017 |  |  |  |  |  |
Equity Securities |  |  | $575.2 |  |  |  | $308.6 |  |  |  | $— |
Debt Securities |  | 330.5 |  |  | 4.2 |  |  | 1.2 |
Total |  |  | $905.7 |  |  |  | $312.8 |  |  |  | $1.2 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value | The fair value and gross unrealized losses of the available-for-sale 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, 2018:
|  | Debt Securities
|  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  |  | $240.7 |  |  |  | $5.5 |
More than 12 months |  | 10.2 |  |  | 0.3 |
Total |  |  | $250.9 |  |  |  | $5.8 |
The fair value and gross unrealized losses of the available-for-sale 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:
| Equity Securities |  | Debt Securities
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
| (In Millions)
Less than 12 months |  | $— |  |  |  | $— |  |  |  | $196.9 |  |  |  | $1.0 |
More than 12 months | — |  |  | — |  |  | 10.4 |  |  | 0.2 |
Total |  | $— |  |  |  | $— |  |  |  | $207.3 |  |  |  | $1.2 |
Fair Value Of Debt Securities By Contractual Maturities | The fair value of debt securities, summarized by contractual maturities, as of March 31, 2018 and December 31, 2017 are as follows:
| 2018 |  | 2017
| (In Millions)
less than 1 year |  | $5.5 |  |  |  | $4.1 |
1 year - 5 years | 164.5 |  |  | 173.0 |
5 years - 10 years | 78.4 |  |  | 78.5 |
10 years - 15 years | 3.8 |  |  | 1.0 |
15 years - 20 years | 10.7 |  |  | 6.9 |
20 years+ | 62.7 |  |  | 67.0 |
Total |  | $325.6 |  |  |  | $330.5 |

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