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Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 31, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Amount of Facility |  | $ 3,500,000 | $ 3,500,000 |
Amount of total borrowing capacity against which fronting commitments exist |  | 20,000 | 20,000 |
Letters of Credit Outstanding, Amount |  | 69,000 | $ 69,000 | $ 34,000
Line of credit facility, commitment fee percentage |  |  | 0.225% |
Amount Drawn/ Outstanding |  | 1,125,000 | $ 1,125,000 |
Commercial Paper program limit |  | 2,000,000 | 2,000,000 |
Commercial Paper Amount Outstanding |  | $ 655,000 | $ 655,000 |
Commercial Paper Program [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, weighted average interest rate |  | 1.88% | 1.88% |
Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, weighted average interest rate |  | 3.31% | 3.31% |
Entergy Arkansas [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term borrowings |  | $ 43,887 | $ 43,887 | 49,974
Authorized Short Term Borrowings |  | 250,000 | 250,000 |
Amount of total borrowing capacity against which fronting commitments exist |  | 5,000 | 5,000 |
Letters of Credit Outstanding, Amount |  | 200 | 200 | 200
Entergy Louisiana [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term borrowings |  | 62,922 | 62,922 | 43,540
Authorized Short Term Borrowings |  | 450,000 | 450,000 |
Amount of total borrowing capacity against which fronting commitments exist |  | 15,000 | $ 15,000 |
Entergy Louisiana [Member] | Mortgage Bonds, Four Point Zero Zero Percent due March Twenty Thirty Three [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance Of Debt |  | $ 750,000 |  |
Debt instrument, interest rate, stated percentage |  | 4.00% | 4.00% |
Entergy Mississippi [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Authorized Short Term Borrowings |  | $ 175,000 | $ 175,000 |
Letters of Credit Outstanding, Amount |  | 100 | 100 | 100
Entergy Texas [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Authorized Short Term Borrowings |  | 200,000 | 200,000 |
Amount of total borrowing capacity against which fronting commitments exist |  | 30,000 | 30,000 |
Letters of Credit Outstanding, Amount |  | 200 | 200 | 50
System Energy [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term borrowings |  | 43,170 | 43,170 | $ 17,830
Authorized Short Term Borrowings |  | 200,000 | 200,000 |
Entergy Nuclear Vermont Yankee [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of Facility |  | 145,000 | $ 145,000 |
Line of credit facility, commitment fee percentage |  |  | 0.20% |
Amount Drawn/ Outstanding |  | 118,000 | $ 118,000 |
Line of Credit Facility, Interest Rate During Period |  |  | 3.10% |
Entergy New Orleans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Authorized Short Term Borrowings |  | 150,000 | $ 150,000 |
Amount of total borrowing capacity against which fronting commitments exist |  | 10,000 | 10,000 |
System Energy VIE [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount Drawn/ Outstanding |  | $ 43,200 | $ 43,200 |
Line of credit facility commitment fee as a percentage of undrawn commitment amount |  |  | 0.10% |
System Energy VIE [Member] | Three Point Seven Eight Percent Series I Notes Due October Two Thousand Eighteen [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage |  | 3.78% | 3.78% |
System Energy VIE [Member] | Three Point Four Two Percent Series J Notes Due April Two Thousand Twenty One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance Of Debt |  | $ 100,000 |  |
Debt instrument, interest rate, stated percentage |  | 3.42% | 3.42% |
Entergy Arkansas VIE [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount Drawn/ Outstanding |  | $ 43,900 | $ 43,900 |
Line of credit facility commitment fee as a percentage of undrawn commitment amount |  |  | 0.10% |
Entergy Arkansas VIE [Member] | Three Point Six Five Percent Series L Notes Due July Two Thousand Twenty One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage |  | 3.65% | 3.65% |
Entergy Louisiana Waterford VIE [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount Drawn/ Outstanding |  | $ 62,900 | $ 62,900 |
Line of credit facility commitment fee as a percentage of undrawn commitment amount |  |  | 0.10% |
Entergy Louisiana Waterford VIE [Member] | Three Point Nine Two Percent Series H Dues February Two Thousand Twenty One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate, stated percentage |  | 3.92% | 3.92% |
Entergy Louisiana River Bend VIE [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount Drawn/ Outstanding |  | $ 52,300 | $ 52,300 |
Line of credit facility commitment fee as a percentage of undrawn commitment amount |  |  | 0.10% |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, commitment fee percentage |  |  | 0.275% |
Consolidated debt ratio |  | 0.65 | 0.65 |
Maximum [Member] | Entergy Arkansas [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated debt ratio |  | 0.65 | 0.65 |
Consolidated debt ratio of total capitalization |  |  | 70.00% |
Maximum [Member] | Entergy Louisiana [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated debt ratio |  | 0.65 | 0.65 |
Consolidated debt ratio of total capitalization |  |  | 70.00% |
Maximum [Member] | Entergy Mississippi [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated debt ratio |  | 0.65 | 0.65 |
Maximum [Member] | Entergy Texas [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated debt ratio |  | 0.65 | 0.65 |
Maximum [Member] | System Energy [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated debt ratio of total capitalization |  |  | 70.00% |
Maximum [Member] | Entergy New Orleans [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated debt ratio |  | 0.65 | 0.65 |
Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, commitment fee percentage |  |  | 0.075% |
Credit Facility Of Three Hundred Fifty Million [Member] | Entergy Louisiana [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of Facility |  | $ 350,000 | $ 350,000 |
Letters of Credit Outstanding, Amount |  | 9,100 | 9,100 |
Amount Drawn/ Outstanding |  | 100,000 | $ 100,000 |
Line of Credit Facility, Interest Rate During Period |  |  | 2.94% |
Credit Facility Of One Hundred And Fifty Million [Member] | Entergy Arkansas [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of Facility |  | 150,000 | $ 150,000 |
Letters of Credit Outstanding, Amount |  | 0 | 0 |
Amount Drawn/ Outstanding |  | 50,000 | $ 50,000 |
Line of Credit Facility, Interest Rate During Period |  |  | 3.12% |
Credit Facility Of One Hundred And Fifty Million [Member] | Entergy Texas [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amount of Facility |  | 150,000 | $ 150,000 |
Letters of Credit Outstanding, Amount |  | 24,400 | 24,400 |
Amount Drawn/ Outstanding |  | $ 0 | $ 0 |
Line of Credit Facility, Interest Rate During Period |  |  | 3.39% |
Subsequent Event [Member] | Entergy Louisiana [Member] | Mortgage Bonds Six Point Zero Percent Series Due May Twenty Eighteen [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption of debt instrument | $ 375,000 |  |  |
Debt instrument, interest rate, stated percentage | 6.00% |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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