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Decommissioning Trust Funds (Securities Held) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 4,991.0 | $ 4,903.0
Total Unrealized Gains | 1,345.0 | 1,307.0
Total Unrealized Losses | 16.0 | 29.0
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 3,061.0 | 3,073.0
Total Unrealized Gains | 1,290.0 | 1,260.0
Total Unrealized Losses | 1.0 | 0
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,930.0 | 1,830.0
Total Unrealized Gains | 55.0 | 47.0
Total Unrealized Losses | 15.0 | 29.0
Entergy Arkansas [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 721.5 | 710.9
Total Unrealized Gains | 224.3 | 219.3
Total Unrealized Losses | 2.9 | 5.2
Entergy Arkansas [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 460.8 | 463.3
Total Unrealized Gains | 218.6 | 214.0
Total Unrealized Losses | 0 | 0
Entergy Arkansas [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 260.7 | 247.6
Total Unrealized Gains | 5.7 | 5.3
Total Unrealized Losses | 2.9 | 5.2
Entergy Gulf States Louisiana [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 586.2 | 573.7
Total Unrealized Gains | 154.2 | 149.2
Total Unrealized Losses | 1.8 | 3.5
Entergy Gulf States Louisiana [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 359.9 | 370.8
Total Unrealized Gains | 145.4 | 141.8
Total Unrealized Losses | 0 | 0
Entergy Gulf States Louisiana [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 226.3 | 202.9
Total Unrealized Gains | 8.8 | 7.4
Total Unrealized Losses | 1.8 | 3.5
Entergy Louisiana [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 353.6 | 347.3
Total Unrealized Gains | 103.5 | 100.8
Total Unrealized Losses | 1.2 | 1.9
Entergy Louisiana [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 225.0 | 224.2
Total Unrealized Gains | 98.3 | 96.1
Total Unrealized Losses | 0 | 0
Entergy Louisiana [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 128.6 | 123.1
Total Unrealized Gains | 5.2 | 4.7
Total Unrealized Losses | 1.2 | 1.9
System Energy [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 619.3 | 603.9
Total Unrealized Gains | 158.3 | 154.3
Total Unrealized Losses | 0.7 | 1.8
System Energy [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 385.9 | 380.0
Total Unrealized Gains | 154.8 | 150.8
Total Unrealized Losses | 0 | 0
System Energy [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 233.4 | 223.9
Total Unrealized Gains | 3.5 | 3.5
Total Unrealized Losses | $ 0.7 | $ 1.8

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