XML 78 R35.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 11, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018
Equity [Abstract] |  |  |  |  |
Stock Options Excluded From Diluted Common Shares Outstanding Calculation |  |  | 4,000,000 | 4,900,000 |
Shares, Issued |  |  | 281,614 |  |
Common stock dividend (in dollars per share) |  |  | $ 0.89 | $ 0.87 |
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax |  |  |  |  | $ 632,617
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | [1] |  |  |  | $ 56,360
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects |  |  | $ 15,505 |  |
Tax Cuts and Jobs Act, Portion Reclassified from AOCI to Retained Earnings |  |  | 32,000 |  |
Tax Cuts and Jobs Act, Portion Reclassified from AOCI to Regulatory Liability for Income Taxes |  |  | $ 16,500 |  |
Subsequent Event [Member] |  |  |  |  |
Equity [Abstract] |  |  |  |  |
Common stock dividend (in dollars per share) |  | $ 0.89 |  |  |
[1] | Text selection found with no content.

X
- Definition Equity. + References No definition available. + Details
Name: | etr_EquityTextualAbstract
Namespace Prefix: | etr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of stock options not included in the calculation of diluted common shares outstanding due to their antidilutive effect. + References No definition available. + Details
Name: | etr_StockOptionsExcludedFromDilutedCommonSharesOutstandingCalculation
Namespace Prefix: | etr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act, Portion Reclassified from AOCI to Regulatory Liability for Income Taxes + References No definition available. + Details
Name: | etr_TaxCutsandJobsActPortionReclassifiedfromAOCItoRegulatoryLiabilityforIncomeTaxes
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act, Portion Reclassified from AOCI to Retained Earnings + References No definition available. + Details
Name: | etr_TaxCutsandJobsActPortionReclassifiedfromAOCItoRetainedEarnings
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects + References No definition available. + Details
Name: | etr_TaxCutsandJobsActReclassificationfromAOCIresultingfromstrandedtaxeffects
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after tax, of accumulated gain (loss) from increase (decrease) in instrument-specific credit risk of financial liability measured under fair value option. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
Name: | us-gaap_AccumulatedOtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 + Details
Name: | us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
Name: | us-gaap_SharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |