XML 106 R60.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Decommissioning Trust Funds (Securities Held) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 5,452.0 | $ 5,350.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,716.0 | 1,437.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5.0 | 19.0
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 3,203.0 | 3,195.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,638.0 | 1,396.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1.0 | 2.0
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 2,249.0 | 2,155.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 78.0 | 41.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 4.0 | 17.0
Entergy Arkansas [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 785.5 | 771.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 248.0 | 238.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1.0 | 2.4
Entergy Arkansas [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 474.3 | 467.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 238.5 | 234.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.2 | 0.2
Entergy Arkansas [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 311.2 | 303.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 9.5 | 4.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.8 | 2.2
Entergy Louisiana [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,065.2 | 1,042.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 308.3 | 296.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.9 | 2.6
Entergy Louisiana [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 643.0 | 632.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 289.3 | 283.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.1 | 0.2
Entergy Louisiana [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 422.2 | 409.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 19.0 | 13.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.8 | 2.4
System Energy [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 719.8 | 701.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 188.2 | 181.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.5 | 2.6
System Energy [Member] | Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 428.4 | 423.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 182.7 | 179.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.1 | 0.3
System Energy [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 291.4 | 277.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5.5 | 2.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0.4 | $ 2.3

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity 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 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=etr_EntergyArkansasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=etr_EntergyLouisianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=etr_SystemEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |