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Decommissioning Trust Funds (Available For Sale Securities Continuous Unrealized Loss Position Fair Value) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | $ 38.0 | $ 54.0
More than 12 months Fair Value | 0.0 | 1.0
Total Fair Value | 38.0 | 55.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1.0 | 2.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1.0 | 2.0
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 196.0 | 1,031.0
More than 12 months Fair Value | 73.0 | 61.0
Total Fair Value | 269.0 | 1,092.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2.0 | 15.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2.0 | 2.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 4.0 | 17.0
Entergy Arkansas [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 7.3 | 7.8
More than 12 months Fair Value | 0.0 | 0.0
Total Fair Value | 7.3 | 7.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.2 | 0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.2 | 0.2
Entergy Arkansas [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 18.1 | 111.4
More than 12 months Fair Value | 11.3 | 18.5
Total Fair Value | 29.4 | 129.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.4 | 1.7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.4 | 0.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.8 | 2.2
Entergy Louisiana [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 8.6 | 9.4
More than 12 months Fair Value | 0.0 | 0.0
Total Fair Value | 8.6 | 9.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.1 | 0.2
Entergy Louisiana [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 24.0 | 124.0
More than 12 months Fair Value | 11.0 | 7.4
Total Fair Value | 35.0 | 131.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.3 | 2.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.5 | 0.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.8 | 2.4
System Energy [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 3.9 | 8.3
More than 12 months Fair Value | 0.0 | 0.9
Total Fair Value | 3.9 | 9.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.1 | 0.3
System Energy [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 45.8 | 200.4
More than 12 months Fair Value | 2.4 | 5.0
Total Fair Value | 48.2 | 205.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.3 | 2.2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.1 | 0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 0.4 | $ 2.3

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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