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Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Book Value And The Fair Value Of Long-Term Debt) (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Short-term Debt [Line Items] |  |  |  |
Long-term Debt, Fair Value | $ 12,666,156,000 | [1],[2] | $ 12,439,785,000 | [1],[3]
Long-term Debt, Book Value | 12,621,307,000 |  | 12,596,244,000 |
Notes payable to power authority | 96,000,000 |  | 95,000,000 |
Entergy Arkansas [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term Debt, Fair Value | 2,329,749,000 | [1],[2] | 2,142,527,000 | [1],[3]
Long-term Debt, Book Value | 2,530,596,000 |  | 2,405,802,000 |
Long term DOE obligations | 181,000,000 |  | 181,000,000 |
Entergy Gulf States Louisiana [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term Debt, Fair Value | 1,628,264,000 | [1],[2] | 1,631,308,000 | [1],[3]
Long-term Debt, Book Value | 1,513,024,000 |  | 1,527,465,000 |
Entergy Louisiana [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term Debt, Fair Value | 3,211,101,000 | [1],[2] | 3,148,877,000 | [1],[3]
Long-term Debt, Book Value | 3,242,584,000 |  | 3,219,516,000 |
Capital Lease Obligations | 132,000,000 |  | 149,000,000 |
Entergy Mississippi [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term Debt, Fair Value | 1,186,913,000 | [1],[2] | 1,067,006,000 | [1],[3]
Long-term Debt, Book Value | 1,153,675,000 |  | 1,053,670,000 |
Entergy New Orleans [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term Debt, Fair Value | 221,758,000 | [1],[2] | 217,692,000 | [1],[3]
Long-term Debt, Book Value | 225,943,000 |  | 225,944,000 |
Entergy Texas [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term Debt, Fair Value | 1,703,937,000 | [1],[2] | 1,726,623,000 | [1],[3]
Long-term Debt, Book Value | 1,534,531,000 |  | 1,556,939,000 |
System Energy [Member] |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Long-term Debt, Fair Value | 675,260,000 | [1],[2] | 664,890,000 | [1],[3]
Long-term Debt, Book Value | 710,721,000 |  | 757,436,000 |
Capital Lease Obligations | $ 51,000,000 |  | $ 97,000,000 |
[1] | Fair values are classified as Level 2 in the fair value hierarchy discussed in Note 8 to the financial statements and are based on prices derived from inputs such as benchmark yields and reported trades.
[2] | The values exclude lease obligations of $132 million at Entergy Louisiana and $51 million at System Energy, long-term DOE obligations of $181 million at Entergy Arkansas, and the note payable to NYPA of $96 million at Entergy, and include debt due within one year.
[3] | The values exclude lease obligations of $149 million at Entergy Louisiana and $97 million at System Energy, long-term DOE obligations of $181 million at Entergy Arkansas, and the note payable to NYPA of $95 million at Entergy, and include debt due within one year.

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- Definition Long-term Debt, Book Value + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Long term DOE obligations + References No definition available. + Details
Name: | etr_LongTermDoeObligations
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Notes payable to power authority + References No definition available. + Details
Name: | etr_NotesPayableToPowerAuthority
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration