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Decommissioning Trust Funds (Fair Value Of Debt Securities By Contractual Maturities) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair value of debt securities by contractual maturities |  |
Less than 1 year | $ 91.0 | $ 83.0
1 year - 5 years | 812.0 | 752.0
5 years - 10 years | 612.0 | 620.0
10 years - 15 years | 169.0 | 169.0
15 years - 20 years | 60.0 | 52.0
20 years+ | 228.0 | 154.0
Total | 1,972.0 | 1,830.0
Entergy Arkansas [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 5.6 | 8.1
1 year - 5 years | 131.1 | 110.9
5 years - 10 years | 116.4 | 118.0
10 years - 15 years | 3.3 | 3.9
15 years - 20 years | 1.0 | 0.9
20 years+ | 7.8 | 5.8
Total | 265.2 | 247.6
Entergy Gulf States Louisiana [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 5.9 | 7.9
1 year - 5 years | 53.2 | 51.2
5 years - 10 years | 83.6 | 75.5
10 years - 15 years | 55.8 | 55.8
15 years - 20 years | 6.0 | 4.6
20 years+ | 24.4 | 7.9
Total | 228.9 | 202.9
Entergy Louisiana [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 7.8 | 14.8
1 year - 5 years | 54.4 | 41.9
5 years - 10 years | 42.5 | 37.0
10 years - 15 years | 6.7 | 6.6
15 years - 20 years | 7.8 | 6.2
20 years+ | 17.4 | 16.6
Total | 136.6 | 123.1
System Energy [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 17.7 | 5.5
1 year - 5 years | 152.3 | 144.9
5 years - 10 years | 44.7 | 44.3
10 years - 15 years | 1.3 | 9.3
15 years - 20 years | 3.5 | 1.6
20 years+ | 22.1 | 18.3
Total | $ 241.6 | $ 223.9

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- Definition Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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