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Decommissioning Trust Funds (Fair Value Of Debt Securities By Contractual Maturities) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair value of debt securities by contractual maturities |  |
Less than 1 year | $ 98.0 | $ 77.0
1 year - 5 years | 855.0 | 857.0
5 years - 10 years | 711.0 | 704.0
10 years - 15 years | 144.0 | 124.0
15 years - 20 years | 58.0 | 50.0
20 years+ | 383.0 | 343.0
Total | 2,249.0 | 2,155.0
Entergy Arkansas [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 3.7 | 1.8
1 year - 5 years | 142.0 | 145.2
5 years - 10 years | 138.4 | 138.5
10 years - 15 years | 7.5 | 2.4
15 years - 20 years | 2.1 | 2.0
20 years+ | 17.5 | 14.0
Total | 311.2 | 303.9
Entergy Louisiana [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 31.9 | 27.1
1 year - 5 years | 114.8 | 124.0
5 years - 10 years | 121.2 | 114.3
10 years - 15 years | 43.6 | 39.3
15 years - 20 years | 29.7 | 26.5
20 years+ | 81.0 | 78.7
Total | 422.2 | 409.9
System Energy [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 4.6 | 2.0
1 year - 5 years | 180.9 | 181.2
5 years - 10 years | 73.3 | 63.0
10 years - 15 years | 4.5 | 4.4
15 years - 20 years | 1.5 | 1.6
20 years+ | 26.6 | 25.6
Total | $ 291.4 | $ 277.8

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- Definition Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: 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 2: 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=73527792&loc=d3e27198-111563 Reference 3: 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=73527792&loc=d3e27161-111563 + Details
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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: 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=73527792&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 + Details
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