XML 100 R60.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Decommissioning Trust Funds (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Decommissioning Trust Funds [Abstract] |  |  |
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts | $ 335,000,000 |  | $ 329,000,000
Amortized cost of debt securities | 1,895,000,000 |  | 1,843,000,000
Average coupon rate of debt securities | 3.36% |  |
Average duration of debt securities, years | 5 years 1 month 17 days |  |
Average maturity of debt securities, years | 7 years 7 months 6 days |  |
Proceeds from the dispositions of debt securities | 537,000,000 | 398,000,000 |
Gains from dispositions of debt securities, gross | 6,000,000 | 6,000,000 |
Losses from dispositions of debt securities, gross | 2,000,000 | 2,000,000 |
Entergy Arkansas [Member] |  |  |
Decommissioning Trust Funds [Abstract] |  |  |
Amortized cost of debt securities | 259,000,000 |  | 248,900,000
Average coupon rate of debt securities | 2.78% |  |
Average duration of debt securities, years | 4 years 10 months 21 days |  |
Average maturity of debt securities, years | 5 years 7 months 6 days |  |
Proceeds from the dispositions of debt securities | 45,300,000 | 56,100,000 |
Gains from dispositions of debt securities, gross | 100,000 | 1,400,000 |
Losses from dispositions of debt securities, gross | 200,000 | 100,000 |
Entergy Gulf States Louisiana [Member] |  |  |
Decommissioning Trust Funds [Abstract] |  |  |
Amortized cost of debt securities | 219,500,000 |  | 199,100,000
Average coupon rate of debt securities | 4.42% |  |
Average duration of debt securities, years | 5 years 6 months 11 days |  |
Average maturity of debt securities, years | 8 years 0 months 29 days |  |
Proceeds from the dispositions of debt securities | 30,300,000 | 23,300,000 |
Gains from dispositions of debt securities, gross | 200,000 | 1,100,000 |
Losses from dispositions of debt securities, gross | 200,000 | 1,700 |
Entergy Louisiana [Member] |  |  |
Decommissioning Trust Funds [Abstract] |  |  |
Amortized cost of debt securities | 124,700,000 |  | 120,600,000
Average coupon rate of debt securities | 3.06% |  |
Average duration of debt securities, years | 4 years 10 months 10 days |  |
Average maturity of debt securities, years | 7 years 9 months 29 days |  |
Proceeds from the dispositions of debt securities | 18,100,000 | 3,600,000 |
Gains from dispositions of debt securities, gross | 200,000 | 40,000 |
Losses from dispositions of debt securities, gross | 3,900 | 10,000 |
System Energy [Member] |  |  |
Decommissioning Trust Funds [Abstract] |  |  |
Amortized cost of debt securities | 230,500,000 |  | 223,400,000
Average coupon rate of debt securities | 1.98% |  |
Average duration of debt securities, years | 4 years 4 months 17 days |  |
Average maturity of debt securities, years | 6 years 1 month 10 days |  |
Proceeds from the dispositions of debt securities | 130,300,000 | 25,600,000 |
Gains from dispositions of debt securities, gross | 1,000,000 | 20,000 |
Losses from dispositions of debt securities, gross | $ 300,000 | $ 70,000 |

X
- Definition Average coupon rate of debt securities percentage. + References No definition available. + Details
Name: | etr_AverageCouponRateOfDebtSecuritiesPercentage
Namespace Prefix: | etr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Average Duration of Debt Securities in Years + References No definition available. + Details
Name: | etr_AverageDurationofDebtSecuritiesinYears
Namespace Prefix: | etr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average Maturity of Debt Securities, Years + References No definition available. + Details
Name: | etr_AverageMaturityofDebtSecuritiesYears
Namespace Prefix: | etr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | etr_DecommissioningTrustFundsTextualAbstract
Namespace Prefix: | etr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + 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 210.5-02.2) -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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This item represents the tax effects occurring during the period which are related to the net unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax affects would have been charged or credited directly to other comprehensive income or to related components of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324 + Details
Name: | us-gaap_AvailableForSaleSecuritiesIncomeTaxExpenseOnChangeInUnrealizedHoldingGainOrLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of debt securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration