Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands	1 Months Ended				3 Months Ended		12 Months Ended
	Mar. 31, 2019 $ / kWh	Mar. 31, 2018 $ / kWh	Mar. 31, 2017 $ / kWh	Dec. 31, 2014 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) $ / kWh shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Jan. 31, 2019 USD ($)
Operating and Finance Lease Right of Use Asset and Lease Liabilities at Implementation										$ 263,000
Income Tax Expense (Benefit)							$ (169,825)	$ (1,036,826)	$ 542,570
Depreciation rates on average depreciable property							2.80%	2.80%	3.00%
Depreciation rates on average depreciable utility property							2.60%	2.60%	2.60%
Depreciation rates on average depreciable non-utility property							18.30%	18.60%	22.30%
Accumulated depreciation of non-utility property						$ 177,000	$ 184,000	$ 177,000
Construction expenditures in accounts payable						311,000	$ 406,000	$ 311,000
Options outstanding excluded from the calculation of diluted earnings per share | shares							173,290	956,550	2,927,512
Incremental Common Shares Attributable to Share-based Payment Arrangements | shares							600,000	300,000	200,000
Asset Retirement Obligations, Noncurrent						6,355,543	$ 6,159,212	$ 6,355,543
Asset Impairment Charges							290,027	532,321	$ 538,372
After-Tax Asset Impairment Charge					$ 4,200
Asset Write-Offs, Impairments, And Related Charges							226,678	491,739	357,251
Assets, Fair Value Disclosure						7,818,000	7,430,000	7,818,000
Property, Plant and Equipment, Net						304,382	332,864	304,382
Decommissioning							400,802	388,508	405,685
Entergy Wholesale Commodities [Member]
Income Tax Expense (Benefit)							(161,295)	(269,025)	(146,480)
Asset Write-Offs, Impairments, And Related Charges							290,000	532,000	538,000
Impairment of Long-Lived Assets Held-For-Use, Net of Tax							79,000	421,000
Asset Write-Offs, Impairments, And Related Charges							290,027	532,321	538,372
Entergy Louisiana [Member]
Operating and Finance Lease Right of Use Asset and Lease Liabilities at Implementation										51,000
Income Tax Expense (Benefit)							$ 121,623	$ (54,611)	$ 485,298
Depreciation rates on average depreciable property							2.40%	2.30%	2.30%
Accumulated depreciation of non-utility property						161,200	$ 168,500	$ 161,200
Construction expenditures in accounts payable						104,600	$ 115,100	104,600
Percentage Interest in River Bend							30.00%
Portion of percentage of interest of River Bend plant costs, generation, revenues and expenses operating the Louisiana retail deregulated portion of River Bend							15.00%
Rate At Which Electricity Sold To Retail Customers | $ / kWh							0.046
Limit above which incremental revenue shared between ratepayers and shareholders | $ / kWh							0.046
Asset Retirement Obligations, Noncurrent						1,280,272	$ 1,497,349	1,280,272
Assets, Fair Value Disclosure						1,631,400	1,870,200	1,631,400
Property, Plant and Equipment, Net						286,555	312,896	286,555
Asset Write-Offs, Impairments, And Related Charges				$ 16,000
Decommissioning							59,346	53,736	$ 49,457
Entergy Texas [Member]
Operating and Finance Lease Right of Use Asset and Lease Liabilities at Implementation										16,000
Income Tax Expense (Benefit)							$ (53,896)	$ (26,243)	$ 48,481
Depreciation rates on average depreciable property							3.00%	2.70%	2.60%
Accumulated depreciation of non-utility property						4,900	$ 4,900	$ 4,900
Construction expenditures in accounts payable						55,600	88,100	55,600
Asset Retirement Obligations, Noncurrent						7,222	7,631	7,222
Assets, Fair Value Disclosure							51,500
Property, Plant and Equipment, Net						376	376	376
Entergy Arkansas [Member]
Operating and Finance Lease Right of Use Asset and Lease Liabilities at Implementation										59,000
Income Tax Expense (Benefit)							$ (46,769)	$ (297,067)	$ 93,804
Depreciation rates on average depreciable property							2.50%	2.50%	2.50%
Construction expenditures in accounts payable						35,700	$ 67,900	$ 35,700
Rate At Which Electricity Sold To Retail Customers | $ / kWh	0.01882	0.01547	0.01164
Asset Retirement Obligations, Noncurrent						1,048,428	1,242,616	1,048,428
Assets, Fair Value Disclosure						920,100	1,108,600	920,100
Decommissioning							68,030	60,420	$ 56,860
Entergy Mississippi [Member]
Operating and Finance Lease Right of Use Asset and Lease Liabilities at Implementation										26,000
Income Tax Expense (Benefit)							$ 30,866	$ (125,773)	$ 73,919
Depreciation rates on average depreciable property							3.20%	3.20%	3.10%
Accumulated depreciation of non-utility property						500	$ 500	$ 500
Construction expenditures in accounts payable						13,600	34,200	13,600
Asset Retirement Obligations, Noncurrent						9,206	9,727	9,206
Assets, Fair Value Disclosure						71,500	132,600	71,500
Property, Plant and Equipment, Net						4,576	4,560	4,576
Entergy New Orleans [Member]
Operating and Finance Lease Right of Use Asset and Lease Liabilities at Implementation										$ 7,000
Income Tax Expense (Benefit)							$ 186	$ (2,436)	$ 33,278
Depreciation rates on average depreciable property							3.20%	3.50%	3.50%
Construction expenditures in accounts payable						5,800	$ 18,400	$ 5,800
Asset Retirement Obligations, Noncurrent						3,291	3,522	3,291
Assets, Fair Value Disclosure						104,100	90,900	104,100
Property, Plant and Equipment, Net						1,016	1,016	1,016
System Energy [Member]
Income Tax Expense (Benefit)							$ 15,349	$ (47,675)	$ 69,969
Depreciation rates on average depreciable property							2.10%	1.90%	2.80%
Construction expenditures in accounts payable						26,300	$ 23,200	$ 26,300
Asset Retirement Obligations, Noncurrent						896,000	931,729	896,000
Assets, Fair Value Disclosure						965,100	1,122,500	965,100
Decommissioning							$ 35,729	$ 34,336	$ 43,347
Vermont Yankee [Member] | Entergy Wholesale Commodities [Member]
Asset Impairment Charges						$ 173,000