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Decommissioning Trust Funds (Available For Sale Securities Continuous Unrealized Loss Position Fair Value) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | $ 7.0 | $ 0
More than 12 months Fair Value | 0 | 0
Total Fair Value | 7.0 | 0
Less than 12 Months Gross Unrealized Losses | 1.0 | 0
More than 12 Months Gross Unrealized Losses | 0 | 0
Total Gross Unrealized Losses | 1.0 | 0
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 171.0 | 892.0
More than 12 months Fair Value | 242.0 | 60.0
Total Fair Value | 413.0 | 952.0
Less than 12 Months Gross Unrealized Losses | 1.0 | 24.0
More than 12 Months Gross Unrealized Losses | 7.0 | 5.0
Total Gross Unrealized Losses | 8.0 | 29.0
Entergy Arkansas [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 0 | 0
More than 12 months Fair Value | 0 | 0
Total Fair Value | 0 | 0
Less than 12 Months Gross Unrealized Losses | 0 | 0
More than 12 Months Gross Unrealized Losses | 0 | 0
Total Gross Unrealized Losses | 0 | 0
Entergy Arkansas [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 30.9 | 153.2
More than 12 months Fair Value | 54.2 | 6.9
Total Fair Value | 85.1 | 160.1
Less than 12 Months Gross Unrealized Losses | 0.1 | 4.8
More than 12 Months Gross Unrealized Losses | 1.4 | 0.4
Total Gross Unrealized Losses | 1.5 | 5.2
Entergy Gulf States Louisiana [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 0 | 0
More than 12 months Fair Value | 0 | 0
Total Fair Value | 0 | 0
Less than 12 Months Gross Unrealized Losses | 0 | 0
More than 12 Months Gross Unrealized Losses | 0 | 0
Total Gross Unrealized Losses | 0 | 0
Entergy Gulf States Louisiana [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 8.2 | 91.9
More than 12 months Fair Value | 30.7 | 4.6
Total Fair Value | 38.9 | 96.5
Less than 12 Months Gross Unrealized Losses | 0 | 3.1
More than 12 Months Gross Unrealized Losses | 0.9 | 0.4
Total Gross Unrealized Losses | 0.9 | 3.5
Entergy Louisiana [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 0 | 0
More than 12 months Fair Value | 0 | 0
Total Fair Value | 0 | 0
Less than 12 Months Gross Unrealized Losses | 0 | 0
More than 12 Months Gross Unrealized Losses | 0 | 0
Total Gross Unrealized Losses | 0 | 0
Entergy Louisiana [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 7.2 | 38.3
More than 12 months Fair Value | 21.2 | 1.7
Total Fair Value | 28.4 | 40.0
Less than 12 Months Gross Unrealized Losses | 0 | 1.7
More than 12 Months Gross Unrealized Losses | 0.7 | 0.2
Total Gross Unrealized Losses | 0.7 | 1.9
System Energy [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 0 | 0
More than 12 months Fair Value | 0 | 0
Total Fair Value | 0 | 0
Less than 12 Months Gross Unrealized Losses | 0 | 0
More than 12 Months Gross Unrealized Losses | 0 | 0
Total Gross Unrealized Losses | 0 | 0
System Energy [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 28.1 | 121.7
More than 12 months Fair Value | 14.7 | 0.9
Total Fair Value | 42.8 | 122.6
Less than 12 Months Gross Unrealized Losses | 0 | 1.7
More than 12 Months Gross Unrealized Losses | 0.3 | 0.1
Total Gross Unrealized Losses | $ 0.3 | $ 1.8

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a 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=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: 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=27724398&loc=d3e27290-111563 + Details
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