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Decommissioning Trust Funds (Securities Held) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 5,165.0 | $ 4,903.0
Total Unrealized Gains | 1,476.0 | 1,307.0
Total Unrealized Losses | 9.0 | 29.0
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 3,193.0 | 3,073.0
Total Unrealized Gains | 1,409.0 | 1,260.0
Total Unrealized Losses | 1.0 | 0
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,972.0 | 1,830.0
Total Unrealized Gains | 67.0 | 47.0
Total Unrealized Losses | 8.0 | 29.0
Entergy Arkansas [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 746.2 | 710.9
Total Unrealized Gains | 244.9 | 219.3
Total Unrealized Losses | 1.5 | 5.2
Entergy Arkansas [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 481.0 | 463.3
Total Unrealized Gains | 238.4 | 214.0
Total Unrealized Losses | 0 | 0
Entergy Arkansas [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 265.2 | 247.6
Total Unrealized Gains | 6.5 | 5.3
Total Unrealized Losses | 1.5 | 5.2
Entergy Gulf States Louisiana [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 607.6 | 573.7
Total Unrealized Gains | 171.8 | 149.2
Total Unrealized Losses | 0.9 | 3.5
Entergy Gulf States Louisiana [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 378.7 | 370.8
Total Unrealized Gains | 161.1 | 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 | 228.9 | 202.9
Total Unrealized Gains | 10.7 | 7.4
Total Unrealized Losses | 0.9 | 3.5
Entergy Louisiana [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 366.6 | 347.3
Total Unrealized Gains | 113.5 | 100.8
Total Unrealized Losses | 0.7 | 1.9
Entergy Louisiana [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 230.0 | 224.2
Total Unrealized Gains | 107.5 | 96.1
Total Unrealized Losses | 0 | 0
Entergy Louisiana [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 136.6 | 123.1
Total Unrealized Gains | 6.0 | 4.7
Total Unrealized Losses | 0.7 | 1.9
System Energy [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 645.2 | 603.9
Total Unrealized Gains | 176.4 | 154.3
Total Unrealized Losses | 0.3 | 1.8
System Energy [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 403.6 | 380.0
Total Unrealized Gains | 171.4 | 150.8
Total Unrealized Losses | 0 | 0
System Energy [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 241.6 | 223.9
Total Unrealized Gains | 5.0 | 3.5
Total Unrealized Losses | $ 0.3 | $ 1.8

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