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Decommissioning Trust Funds (Fair Value Of Debt Securities By Contractual Maturities) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value of debt securities by contractual maturities |  |
Less than 1 year | $ 89.0 | $ 74.0
1 year - 5 years | 928.0 | 902.0
5 years - 10 years | 784.0 | 812.0
10 years - 15 years | 152.0 | 147.0
15 years - 20 years | 101.0 | 100.0
20 years+ | 565.0 | 515.0
Total | 2,619.0 | 2,550.0
Entergy Arkansas [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 14.1 | 13.0
1 year - 5 years | 130.6 | 123.4
5 years - 10 years | 177.9 | 180.6
10 years - 15 years | 3.4 | 4.8
15 years - 20 years | 7.0 | 3.4
20 years+ | 17.8 | 23.0
Total | 350.8 | 348.2
Entergy Louisiana [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 28.1 | 23.2
1 year - 5 years | 136.7 | 122.8
5 years - 10 years | 108.4 | 109.3
10 years - 15 years | 52.9 | 52.7
15 years - 20 years | 44.7 | 50.7
20 years+ | 145.5 | 135.1
Total | 516.3 | 493.8
System Energy [Member] |  |
Fair value of debt securities by contractual maturities |  |
Less than 1 year | 5.5 | 4.1
1 year - 5 years | 164.5 | 173.0
5 years - 10 years | 78.4 | 78.5
10 years - 15 years | 3.8 | 1.0
15 years - 20 years | 10.7 | 6.9
20 years+ | 62.7 | 67.0
Total | $ 325.6 | $ 330.5

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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=75019621&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=82897076&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=82897076&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=75019621&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=82897076&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=82897076&loc=d3e27198-111563 + Details
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