Risk Management and Fair Values (Narrative) (Details) TWh in Millions	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2019 USD ($) MMBTU GWh	Jun. 30, 2018 USD ($)	Dec. 31, 2019 TWh	Jun. 30, 2019 USD ($) MMBTU GWh	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) counterparty
Risk Management and Fair Values [Abstract]
Cash flow hedges relating to power sales as part of net unrealized gains				$ 67,000,000
Reclassified from accumulated other comprehensive income (OCI) to operating revenues				48,000,000
Maturity of cash flow hedges, Tax	$ 1,000,000	$ 1,000,000		$ 12,000,000	$ (6,000,000)
Maximum length of time over which Company is currently hedging the variability in future cash flows for forecasted power transactions, years				1 year 9 months
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU	41,300,000			41,300,000
Total volume of fixed transmission rights outstanding | GWh	110,968			110,968
Change in cash flow hedges due to ineffectiveness		(15,000,000)			(2,000,000)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset and Liability Unrealized Gains (Loss) Included in Earnings	$ 1,400,000	$ (800,000)		$ (3,500,000)	$ (700,000)
Entergy Arkansas [Member]
Risk Management and Fair Values [Abstract]
Total volume of fixed transmission rights outstanding | GWh	25,480			25,480
Entergy Louisiana [Member]
Risk Management and Fair Values [Abstract]
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU	34,720,000			34,720,000
Total volume of fixed transmission rights outstanding | GWh	50,209			50,209
Entergy Mississippi [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount	$ 200,000			$ 200,000		$ 200,000
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU	6,580,000			6,580,000
Total volume of fixed transmission rights outstanding | GWh	14,072			14,072
Entergy New Orleans [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount	$ 10,200			$ 10,200
Total volume of fixed transmission rights outstanding | GWh	5,160			5,160
Entergy Texas [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount	$ 2,200,000			$ 2,200,000		4,100,000
Total volume of fixed transmission rights outstanding | GWh	15,608			15,608
Gas Hedge Contracts [Member] | Entergy Louisiana [Member]
Risk Management and Fair Values [Abstract]
Maximum Length of Time Hedged in Cash Flow Hedge				4 years 9 months
Gas Hedge Contracts [Member] | Entergy Mississippi [Member]
Risk Management and Fair Values [Abstract]
Maximum Length of Time Hedged in Cash Flow Hedge				9 months
Entergy Wholesale Commodities [Member]
Risk Management and Fair Values [Abstract]
Cash collateral posted	$ 13,000,000			$ 13,000,000		$ 19,000,000
Derivative, Collateral, Obligation to Return Cash	2,000,000			2,000,000
Letters of Credit Held	51,000,000			51,000,000
Number of Derivative Contract Counterparties in a Liability Position | counterparty						6
Dollar amount of hedge contract in a liability position						$ 34,000,000
Utility [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount	$ 2,000,000			$ 2,000,000		$ 4,000,000
Subsequent Event [Member]
Risk Management and Fair Values [Abstract]
Planned generation sold forward from non utility nuclear power plants for the remainder of the period			98.00%
Planned Generation From Non Nuclear Power Plants Sold Forward Under Financial Hedges			72.00%
Total planned generation for remainder of the period | TWh			12.1