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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
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
$ / kWh
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Income Tax Expense (Benefit)           $ 191,374 $ (121,506) $ (169,825)
Depreciation rates on average depreciable property           2.70% 2.80% 2.80%
Depreciation rates on average depreciable utility property           2.70% 2.70% 2.60%
Depreciation rates on average depreciable non-utility property           7.50% 12.70% 18.30%
Accumulated depreciation of non-utility property           $ 200,000 $ 191,000  
Construction expenditures in accounts payable           $ 723,000 $ 745,000  
Options outstanding excluded from the calculation of diluted earnings per share | shares           1,013,320 523,999 173,290
Incremental Common Shares Attributable to Share-based Payment Arrangements | shares           400,000 500,000 600,000
Asset Retirement Obligations, Noncurrent           $ 4,757,084 $ 6,469,452  
Asset Impairment Charges           263,625 26,623 $ 290,027
Asset Write-Offs, Impairments, And Related Charges           263,599 26,379 226,678
Assets, Fair Value Disclosure           6,005,000 9,122,000  
Property, Plant and Equipment, Net           357,576 343,328  
Decommissioning           306,411 381,861 400,802
Regulatory Liability, Noncurrent           2,643,845 2,323,851  
Deferred Tax Equity Partnership Earnings                
Regulatory Liability, Noncurrent           18,100 0  
Entergy Wholesale Commodities [Member]                
Income Tax Expense (Benefit)           (25,381) 104,937 (161,295)
Asset Write-Offs, Impairments, And Related Charges           264,000 19,000 290,000
Asset Write-Offs, Impairments, And Related Charges           263,625 26,623 290,027
Entergy Louisiana [Member]                
Income Tax Expense (Benefit)           $ 120,409 $ (382,324) $ 121,623
Depreciation rates on average depreciable property           2.40% 2.40% 2.40%
Accumulated depreciation of non-utility property           $ 188,500 $ 179,800  
Construction expenditures in accounts payable           $ 507,900 460,500  
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           $ 1,653,198 1,573,307  
Assets, Fair Value Disclosure           2,144,500 2,528,900  
Property, Plant and Equipment, Net           337,247 323,110  
Decommissioning           68,575 65,225 $ 59,346
Regulatory Liability, Noncurrent           1,042,597 918,293  
Entergy Texas [Member]                
Income Tax Expense (Benefit)           $ 25,526 $ 3,042 $ (53,896)
Depreciation rates on average depreciable property           3.20% 3.10% 3.00%
Construction expenditures in accounts payable           $ 73,100 $ 116,800  
Asset Retirement Obligations, Noncurrent           8,520 8,063  
Assets, Fair Value Disclosure           27,400 286,400  
Property, Plant and Equipment, Net           376 376  
Regulatory Liability, Noncurrent           37,060 32,297  
Entergy Arkansas [Member]                
Income Tax Expense (Benefit)           $ 75,195 $ 47,777 $ (46,769)
Depreciation rates on average depreciable property           2.70% 2.60% 2.50%
Construction expenditures in accounts payable           $ 35,600 $ 59,700  
Rate At Which Electricity Sold To Retail Customers | $ / kWh 0.01882 0.01547 0.01164          
Asset Retirement Obligations, Noncurrent           1,390,410 1,314,160  
Assets, Fair Value Disclosure           1,445,500 1,444,600  
Decommissioning           77,696 73,319 $ 68,030
Regulatory Liability, Noncurrent           743,314 686,872  
Entergy Arkansas [Member] | Deferred Tax Equity Partnership Earnings                
Regulatory Liability, Noncurrent           18,100 0  
Entergy Mississippi [Member]                
Income Tax Expense (Benefit)           $ 45,323 $ 27,190 $ 30,866
Depreciation rates on average depreciable property           3.60% 3.50% 3.20%
Accumulated depreciation of non-utility property           $ 500 $ 500  
Construction expenditures in accounts payable           26,500 31,400  
Asset Retirement Obligations, Noncurrent           10,315 9,762  
Assets, Fair Value Disclosure           96,800 65,200  
Property, Plant and Equipment, Net           4,527 4,543  
Regulatory Liability, Noncurrent           49,313 15,828  
Entergy New Orleans [Member]                
Income Tax Expense (Benefit)           $ 5,936 $ (4,207) $ 186
Depreciation rates on average depreciable property           3.20% 3.10% 3.20%
Construction expenditures in accounts payable             $ 9,200  
Asset Retirement Obligations, Noncurrent           $ 4,032 3,768  
Assets, Fair Value Disclosure           44,900 86,500  
Property, Plant and Equipment, Net           1,016 1,016  
System Energy [Member]                
Income Tax Expense (Benefit)           $ (1,977) $ 20,543 $ 15,349
Depreciation rates on average depreciable property           1.90% 2.10% 2.10%
Construction expenditures in accounts payable           $ 23,400 $ 17,700  
Asset Retirement Obligations, Noncurrent           1,007,603 968,910  
Assets, Fair Value Disclosure           1,474,400 1,432,300  
Decommissioning           38,693 37,181 $ 35,729
Regulatory Liability, Noncurrent           $ 744,944 $ 665,396  
Vermont Yankee [Member]                
After-Tax Asset Impairment Charge       $ 4,200        
Vermont Yankee [Member] | Entergy Wholesale Commodities [Member]                
Asset Impairment Charges         $ 173,000