Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
		Feb. 28, 2017	Dec. 31, 2016	Mar. 31, 2016
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 3,500.0
Issuance of letters of credit, percentage of total borrowing capacity			50.00%
Line of credit facility, commitment fee percentage			0.225%
Consolidated debt ratio			65.00%
Commercial Paper program limit			$ 1,500.0
Commercial Paper Amount Outstanding			$ 344.0
Consolidated debt ratio of lessees total capitalization			70.00%
Amount Drawn/ Outstanding			$ 700.0
Entergy Mississippi [Member]
Debt Instrument [Line Items]
Consolidated debt ratio			65.00%
Letters of Credit Outstanding, Amount			$ 0.1
Letters of credit posted to cover derivative exposure			0.1
Entergy New Orleans [Member]
Debt Instrument [Line Items]
Issuance of letters of credit, limit of total borrowing capacity			$ 10.0
Consolidated debt ratio			65.00%
Entergy Nuclear Vermont Yankee [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 100.0	$ 100.0
Line of credit facility, commitment fee percentage			0.20%
Debt, weighted average interest rate			2.17%
Debt Instrument, Interest Rate, Stated Percentage			2.27%
Amount Drawn/ Outstanding			$ 45.0
Uncommitted Credit Facility			$ 85.0
Entergy Arkansas [Member]
Debt Instrument [Line Items]
Issuance of letters of credit, percentage of total borrowing capacity			50.00%
Consolidated debt ratio			65.00%
Consolidated debt ratio of lessees total capitalization			70.00%
Letters of Credit Outstanding, Amount			$ 0.3
Letters of credit posted to cover derivative exposure			$ 0.3
Entergy Texas [Member]
Debt Instrument [Line Items]
Issuance of letters of credit, percentage of total borrowing capacity			50.00%
Consolidated debt ratio			65.00%
Entergy Louisiana [Member]
Debt Instrument [Line Items]
Issuance of letters of credit, percentage of total borrowing capacity			50.00%
Consolidated debt ratio			65.00%
Consolidated debt ratio of lessees total capitalization			70.00%
Entergy Louisiana Waterford VIE [Member]
Debt Instrument [Line Items]
Line of credit facility commitment fee as a percentage of undrawn commitment amount			0.10%
Amount Drawn/ Outstanding	[1]		$ 3.8
Entergy Louisiana River Bend VIE [Member]
Debt Instrument [Line Items]
Line of credit facility commitment fee as a percentage of undrawn commitment amount			0.10%
Amount Drawn/ Outstanding			$ 0.0
System Energy VIE [Member]
Debt Instrument [Line Items]
Line of credit facility commitment fee as a percentage of undrawn commitment amount			0.10%
Amount Drawn/ Outstanding	[1]		$ 66.9
Entergy Arkansas VIE [Member]
Debt Instrument [Line Items]
Line of credit facility commitment fee as a percentage of undrawn commitment amount			0.10%
Amount Drawn/ Outstanding	[1]		$ 0.0
Credit Facility [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate			2.23%
Commercial Paper Program [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate			1.13%
Three Point Nine Two Percent Series H Dues February Two Thousand Twenty One [Member] | Entergy Louisiana Waterford VIE [Member]
Debt Instrument [Line Items]
Notes payable noncurrent amount			$ 40.0
Debt Instrument, Interest Rate, Stated Percentage			3.92%
Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage			0.275%
Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage			0.075%
Subsequent Event [Member] | Four Point Zero Two Percent Series H Notes [Domain] | System Energy VIE [Member]
Debt Instrument [Line Items]
Redemption of debt instrument		$ 50.0
Debt, weighted average interest rate		4.02%

[1] (b) Commercial paper, classified as a current liability.