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Risk Management and Fair Values (Schedules Of Valuation Techniques) (Details) | Mar. 31, 2018 USD ($)
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Fair Value of Electricity Swaps | $ 75,000,000
Maximum [Member] |
Range from Average Percentage for Fair Value of Electricity Swaps | 4.75%
Effect of Significant Unobservable Inputs on Fair Value of Electricity Swaps | $ 7,000,000
Minimum [Member] |
Range from Average Percentage for Fair Value of Electricity Swaps | 4.00%
Effect of Significant Unobservable Inputs on Fair Value of Electricity Swaps | $ 5

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- Definition The effect of significant unobservable inputs on the fair value of electricity swaps. + References No definition available. + Details
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Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The fair value of electricity swaps classified as Level 3 in the fair value hierarchy + References No definition available. + Details
Name: | etr_FairValueOfElectricitySwaps
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The range from the average percentage used when calculating the fair value of electricity swaps classified as Level 3 in the fair value hierarchy + References No definition available. + Details
Name: | etr_RangeFromAveragePercentageForFairValueOfElectricitySwaps
Namespace Prefix: | etr_
Data Type: | num:percentItemType
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Period Type: | instant

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- Details
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Period Type: |

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- Details
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