Risk Management and Fair Values Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 TWh	Dec. 31, 2020 USD ($) GWh MMBTU	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Risk Management and Fair Values [Abstract]
Included in earnings		$ (0.3)	$ (9.2)	$ (3.5)
Cash flow hedges relating to power sales as part of net unrealized gains		38.0
Reclassified from accumulated other comprehensive income (OCI) to operating revenues		38.0
Maturity of cash flow hedges, Tax		31.0	20.0	(14.0)
Change in cash flow hedges due to ineffectiveness				$ (5.9)
Debt Securities, Available-for-sale, Allowance for Credit Loss		0.1
Power Contracts [Member]
Risk Management and Fair Values [Abstract]
Cash collateral posted		5.0	11.0
Derivative, Collateral, Obligation to Return Cash			1.0
Letters of Credit Held		$ 39.0	98.0
Maximum Length of Time Hedged in Cash Flow Hedge		3 months
Gas Hedge Contracts [Member]
Risk Management and Fair Values [Abstract]
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU		38,799,000
Financial Transmission Rights (FTRs) [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount		$ 1.0
Total volume of FTRs outstanding (MWh) | GWh		57,196
Letters of Credit Held			98.0
Subsequent Event [Member] | Power Contracts [Member]
Risk Management and Fair Values [Abstract]
Planned generation sold forward from non utility nuclear power plants	98.00%
Planned Generation Sold Forward under financial derivatives	29.00%
Total planned generation for remainder of the period | TWh	9.6
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member]
Risk Management and Fair Values [Abstract]
Total volume of FTRs outstanding (MWh) | GWh		14,138
Entergy Louisiana [Member] | Gas Hedge Contracts [Member]
Risk Management and Fair Values [Abstract]
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU		23,720,000
Maximum Length of Time Hedged in Cash Flow Hedge		3 years 3 months
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount		$ 0.3
Total volume of FTRs outstanding (MWh) | GWh		26,679
Entergy Mississippi [Member] | Gas Hedge Contracts [Member]
Risk Management and Fair Values [Abstract]
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU		14,573,000
Maximum Length of Time Hedged in Cash Flow Hedge		10 months
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount		$ 0.2	$ 0.2
Total volume of FTRs outstanding (MWh) | GWh		6,362
Entergy New Orleans [Member] | Gas Hedge Contracts [Member]
Risk Management and Fair Values [Abstract]
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU		506,000
Maximum Length of Time Hedged in Cash Flow Hedge		3 months
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount		$ 0.2
Total volume of FTRs outstanding (MWh) | GWh		2,618
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member]
Risk Management and Fair Values [Abstract]
Letters of Credit Outstanding, Amount		$ 0.5
Total volume of FTRs outstanding (MWh) | GWh		7,205