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Long - Term Debt (Schedule Of Long-term Debt Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Nov. 30, 2020
Dec. 31, 2019
Sep. 30, 2011
Aug. 31, 2010
Debt Instrument [Line Items]          
Unamortized Premium and Discount - Net $ 3,665   $ (16,124)    
Unamortized Debt Issuance Expense (160,420)   (143,502)    
Other 5,575   12,096    
Total Long-Term Debt 22,369,776   17,873,655    
Long-term Debt, Current Maturities 1,164,015   795,012    
Long-term Debt, Excluding Current Maturities 21,205,761   17,078,643    
Fair Value of Long-Term Debt 24,813,818   19,059,950    
Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Unamortized Premium and Discount - Net 3,685   6,127    
Unamortized Debt Issuance Expense (18,108)   (16,998)    
Total Long-Term Debt 1,780,577   1,614,129    
Long-term Debt, Current Maturities 0   0    
Long-term Debt, Excluding Current Maturities 1,780,577   1,614,129    
Fair Value of Long-Term Debt 2,021,432   1,709,505    
Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Unamortized Premium and Discount - Net 6,938   1,664    
Unamortized Debt Issuance Expense (30,638)   (34,936)    
Other 1,989   2,007    
Total Long-Term Debt 3,967,507   3,517,208    
Long-term Debt, Current Maturities 485,000   0    
Long-term Debt, Excluding Current Maturities 3,482,507   3,517,208    
Fair Value of Long-Term Debt 4,355,632   3,747,914    
Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Unamortized Premium and Discount - Net (2,863)   (17,372)    
Unamortized Debt Issuance Expense (61,132)   (58,089)    
Other 3,586   6,065    
Total Long-Term Debt 9,027,451   7,303,669    
Long-term Debt, Current Maturities 240,000   320,002    
Long-term Debt, Excluding Current Maturities 8,787,451   6,983,667    
Fair Value of Long-Term Debt 10,258,294   7,961,168    
Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Unamortized Premium and Discount - Net (91)   (129)    
Unamortized Debt Issuance Expense (8,055)   (7,775)    
Total Long-Term Debt 642,233   560,906    
Notes Payable, Related Parties, Current 1,618   1,838    
Long-term Debt, Current Maturities 0   25,000    
Long-term Debt, Excluding Current Maturities 629,704   521,539    
Long Term Debt Excluding Amount Due Within One Year 640,615   534,068    
Fair Value of Long-Term Debt 620,634   523,846    
Long-term debt and notes payable related parties, current     26,838    
Entergy Texas [Member]          
Debt Instrument [Line Items]          
Unamortized Premium and Discount - Net 14,064   (4,814)    
Unamortized Debt Issuance Expense (19,048)   (17,510)    
Other 0   4,022    
Total Long-Term Debt 2,493,708   1,922,956    
Long-term Debt, Current Maturities 200,000   0    
Long-term Debt, Excluding Current Maturities 2,293,708   1,922,956    
Fair Value of Long-Term Debt 2,765,193   2,090,215    
System Energy [Member]          
Debt Instrument [Line Items]          
Unamortized Premium and Discount - Net (165)   (144)    
Unamortized Debt Issuance Expense (2,897)   (1,697)    
Other 0   2    
Total Long-Term Debt 805,274   548,107    
Long-term Debt, Current Maturities 100,015   10    
Long-term Debt, Excluding Current Maturities 705,259   548,097    
Fair Value of Long-Term Debt $ 840,540   565,209    
Mortgage Bonds Current 2018-2022 [Member]          
Debt Instrument [Line Items]          
Weighted Average Interest Rate 3.23%        
Long-term Debt, Gross $ 4,400,000   $ 3,575,000    
Mortgage Bonds Current 2018-2022 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 0.62%   2.55%    
Mortgage Bonds Current 2018-2022 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.59%   5.59%    
Mortgage Bonds 2023-2027 [Member]          
Debt Instrument [Line Items]          
Weighted Average Interest Rate 3.35%        
Long-term Debt, Gross $ 4,113,000   $ 3,735,000    
Mortgage Bonds 2023-2027 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.14%   2.40%    
Mortgage Bonds 2023-2027 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.44%   4.44%    
Mortgage Bonds 2028-2031 [Member]          
Debt Instrument [Line Items]          
Weighted Average Interest Rate 3.38%        
Long-term Debt, Gross $ 2,552,000   $ 1,590,000    
Mortgage Bonds 2028-2031 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.60%   3.05%    
Mortgage Bonds 2028-2031 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.52%   4.52%    
Mortgage Bonds 2044-2066 [Member]          
Debt Instrument [Line Items]          
Weighted Average Interest Rate 4.12%        
Long-term Debt, Gross $ 6,380,000   $ 5,170,000    
Mortgage Bonds 2044-2066 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.65%   3.55%    
Mortgage Bonds 2044-2066 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.50%   5.625%    
Mortgage Bonds 2.40% Series Due October 2026 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.40%        
Long-term Debt, Gross $ 400,000   $ 400,000    
Mortgage Bonds, 2.55% Series Due June 2021 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.55%        
Long-term Debt, Gross $ 125,000   125,000    
Mortgage Bonds 2.85% Series Due June 2028 [Member] | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.85%        
Long-term Debt, Gross $ 375,000   375,000    
Mortgage Bonds 4.52% Series Due December 2038 [Member] | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.52%        
Long-term Debt, Gross $ 55,000   55,000    
Mortgage bonds, 3.85% Series due June 2049 [Member] | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.85%        
Long-term Debt, Gross $ 435,000   435,000    
Mortgage Bonds Three Point Zero Five Percent Series Due June Two Thousand Thirty One [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.05%        
Long-term Debt, Gross $ 325,000   325,000    
Mortgage Bonds 4.0% Series Due March 2033 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.00%        
Long-term Debt, Gross $ 750,000   750,000    
Mortgage Bonds, 3.05% Series, Due June 2023 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.05%        
Long-term Debt, Gross $ 250,000   250,000    
Mortgage Bonds, 3.1% Series, Due July 2023 [Member] | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.10%        
Long-term Debt, Gross $ 250,000   250,000    
Mortgage Bonds, 3.12% Series, Due September 2027 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.12%        
Long-term Debt, Gross $ 450,000   450,000    
Mortgage Bonds, 3.25% Series, Due April 2028 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.25%        
Long-term Debt, Gross $ 425,000   425,000    
Mortgage Bonds, 3.25% Series, Due December 2027 [Member] | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.25%        
Long-term Debt, Gross $ 150,000   150,000    
Mortgage Bonds, 3.3% Series, Due December 2022 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.30%        
Long-term Debt, Gross $ 200,000   200,000    
Three Point Five Percent Series First Mortgage Bonds Due April Two Thousand Twenty Six [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.50%        
Long-term Debt, Gross $ 600,000   600,000    
4.0% Series First Mortgage Bonds Due June 2028 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.00%        
Long-term Debt, Gross $ 350,000   250,000    
Mortgage Bonds, 3.75% Series, Due February 2021 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.75%        
Long-term Debt, Gross $ 350,000   350,000    
Mortgage Bonds, 3.75% Series, Due July 2024 [Member] | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.75%        
Long-term Debt, Gross $ 100,000   100,000    
Mortgage Bonds 3.7% Series, Due June 2024 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.70%        
Long-term Debt, Gross $ 375,000   375,000    
Mortgage Bonds, 3.78% Series, Due April 2025 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.78%        
Long-term Debt, Gross $ 110,000   110,000    
Mortgage Bonds, 3.78 % Series Due April 2025 (Legacy) [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.78%        
Long-term Debt, Gross $ 190,000   190,000    
Mortgage Bonds, 3.9% Series, Due July 2023 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.90%        
Long-term Debt, Gross $ 100,000   100,000    
Mortgage Bonds, 3.95% Series, Due October 2020 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.95%        
Long-term Debt, Gross $ 0   250,000    
Mortgage Bonds, 4.0% Series, Due June 2026 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.00%        
Long-term Debt, Gross $ 85,000   85,000    
Mortgage Bonds, 4.51% Series Due September 2033 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.51%        
Long-term Debt, Gross $ 60,000   60,000    
Mortgage Bonds, 4.05% Series, Due September 2023 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.05%        
Long-term Debt, Gross $ 325,000   325,000    
Mortgage Bonds, Four Point Nine Zero Percent Series, Due October Two Thousand Sixty Six [Member] | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.90%        
Long-term Debt, Gross $ 260,000   260,000    
Mortgage Bonds, 4.1% Series, Due April 2023 [Member] | System Energy [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.10%        
Long-term Debt, Gross $ 250,000   250,000    
Mortgage Bonds, 4.1% Series, Due September 2021 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.10%        
Long-term Debt, Gross $ 75,000   75,000    
Mortgage Bonds 3.45% Series Due December 2027 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.45%        
Long-term Debt, Gross $ 150,000   150,000    
4.0% Series First Mortgage Bonds Due March 2029 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.00%        
Long-term Debt, Gross $ 300,000   300,000    
4.50% Series First Mortgage Bonds Due March 2039 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.50%        
Long-term Debt, Gross $ 400,000   400,000    
Mortgage Bonds, 4.44% Series, Due January 2026 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.44%        
Long-term Debt, Gross $ 250,000   250,000    
Mortgage Bonds, 4.7% Series, Due June 2063 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.70%        
Long-term Debt, Gross $ 0   100,000    
Mortgage Bonds, 4.75% Series, Due June 2063 [Member] [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.75%        
Long-term Debt, Gross $ 0   125,000    
Mortgage Bonds, 4.8% Series, Due May 2021 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.80%        
Long-term Debt, Gross $ 200,000   200,000    
Four Point Eight Seven Five Percent Series First Mortgage Bonds Due September Two Thousand Sixty Six [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.875%        
Long-term Debt, Gross $ 410,000   410,000    
Four Point Eight Seven Five Percent Series First Mortgage Bonds Due September Two Thousand Sixty Six [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.875%        
Long-term Debt, Gross $ 270,000   270,000    
Mortgage Bonds, 4.9% Series, Due December 2052 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.90%        
Long-term Debt, Gross $ 0   200,000    
Mortgage Bonds, 4.95% Series, Due December 2044 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.95%        
Long-term Debt, Gross $ 250,000   250,000    
Mortgage Bonds Four Point Two Percent Series Due April 2049 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.20%        
Long-term Debt, Gross $ 350,000   350,000    
Mortgage Bonds, 4.95% Series, Due January 2045 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.95%        
Long-term Debt, Gross $ 450,000   450,000    
Mortgage Bonds, 4.2% Series, Due September 2048 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.20%        
Long-term Debt, Gross $ 900,000   600,000    
Mortgage Bonds, Four Point Two Zero Percent Series due April Twenty Fifty [Member] [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.20%        
Long-term Debt, Gross $ 525,000   525,000    
Mortgage Bonds, 5.0% Series, Due July 2044 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.00%        
Long-term Debt, Gross $ 170,000   170,000    
Mortgage Bonds, 5.0% Series, Due December 2052 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.00%        
Long-term Debt, Gross $ 30,000   30,000    
Mortgage Bonds Five Point One Five Percent Series Due June Two Thousand Forty Five [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.15%        
Long-term Debt, Gross $ 250,000   250,000    
Mortgage Bonds 3.55% Series Due September 2049 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.55%        
Long-term Debt, Gross $ 475,000   300,000    
Mortgage Bonds, 5.10% Series, Due December 2020 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.10%        
Long-term Debt, Gross $ 0   25,000    
Mortgage Bonds, 5.25% Series, Due July 2052 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.25%        
Long-term Debt, Gross $ 0   200,000    
Mortgage Bonds, 5.40% Series, Due November 2024 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.40%        
Long-term Debt, Gross $ 400,000   400,000    
Mortgage Bonds, 5.5% Series, Due April 2066 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.50%        
Long-term Debt, Gross $ 110,000   110,000    
Mortgage Bonds, 5.625% Series, Due June 2064 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.625%        
Long-term Debt, Gross $ 0   135,000    
Mortgage Bonds, 5.59% Series, Due October 2024 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.59%        
Long-term Debt, Gross $ 300,000   300,000    
Mortgage Bonds [Member] | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 1,795,000   1,625,000    
Mortgage Bonds [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 3,610,000   3,160,000    
Mortgage Bonds [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 8,690,000   6,890,000    
Mortgage Bonds [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 525,000   410,000    
Mortgage Bonds [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 2,375,000   1,735,000    
Mortgage Bonds [Member] | System Energy [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 450,000   250,000    
Governmental Bonds 2017-2022 [Member]          
Debt Instrument [Line Items]          
Weighted Average Interest Rate 2.50%        
Long-term Debt, Gross $ 179,000   $ 179,000    
Governmental Bonds 2017-2022 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.375%   2.375%    
Governmental Bonds 2017-2022 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.50%   2.50%    
Governmental Bonds 2028-2030 [Member]          
Debt Instrument [Line Items]          
Weighted Average Interest Rate 3.45%        
Long-term Debt, Gross $ 198,680   $ 198,680    
Governmental Bonds 2028-2030 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.375%   3.375%    
Governmental Bonds 2028-2030 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.50%   3.50%    
Governmental Bonds Two Point Three Seven Five Percent Series Due Two Thousand Twenty One Independence County [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.375%        
Long-term Debt, Gross $ 45,000   $ 45,000    
Governmental Bonds, 3.50% Series, Due 2030, Louisiana Public Facilities Authority [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.50%        
Long-term Debt, Gross $ 115,000   115,000    
Governmental Bonds 2.5% Percent Series Due 2022 Mississippi Business Finance Corporation [Member] | System Energy [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.50%        
Long-term Debt, Gross $ 134,000   134,000    
Governmental Bonds, 3.375% Series, Due 2028, Louisiana Public Facilities Authority [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.375%        
Long-term Debt, Gross $ 83,680   83,680    
Governmental Bonds [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 45,000   45,000    
Governmental Bonds [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 198,680   198,680    
Governmental Bonds [Member] | System Energy [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 134,000   134,000    
Securitization Bonds 2018-2027 [Member]          
Debt Instrument [Line Items]          
Weighted Average Interest Rate 3.59%        
Long-term Debt, Gross $ 177,522   $ 302,145    
Securitization Bonds 2018-2027 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.04%   2.04%    
Securitization Bonds 2018-2027 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.93%   5.93%    
VIE Notes Payable 2017-2023 [Member]          
Debt Instrument [Line Items]          
Weighted Average Interest Rate 2.45%        
Long-term Debt, Gross $ 450,000   $ 360,000    
VIE Notes Payable 2017-2023 [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.05%   3.17%    
VIE Notes Payable 2017-2023 [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.92%   3.92%    
Variable Interest Entity Notes Payable, 3.17% Series M, Due December 2023 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.17%        
Long-term Debt, Gross $ 40,000   $ 40,000    
Variable Interest Entity Notes Payable, 3.22 % Series I, Due December 2023 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.22%        
Long-term Debt, Gross $ 20,000   20,000    
Variable Interest Entity Notes Payable, 3.38% Series R, Due August 2020 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.38%        
Long-term Debt, Gross $ 0   70,000    
Variable Interest Entity Notes Payable, 3.65% Series L, Due July 2021 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.65%        
Long-term Debt, Gross $ 90,000   90,000    
Variable Interest Entity Notes Payable, 3.42% Series J Due April 2021 [Member] | System Energy [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.42%        
Long-term Debt, Gross $ 100,000   100,000    
Variable Interest Entity Notes Payable, Three Point Ninety Two Percent Series H Due February Two Thousand Twenty One [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.92%        
Long-term Debt, Gross $ 40,000   40,000    
Variable Interest Entity Notes Payable [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 142,200   145,100    
Variable Interest Entity Notes Payable [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 188,200   250,200    
Variable Interest Entity Notes Payable [Member] | System Energy [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 190,000   131,600    
Securitization Bonds, 2.04% Series Senior Secured, Due September 2023 [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.04%     2.04%  
Long-term Debt, Gross $ 10,980   34,185    
Securitization Bonds, 2.30% Series Senior Secured, Due August 2021 [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.30%       2.30%
Long-term Debt, Gross $ 0   7,259    
Securitization Bonds, 2.67% Series Senior Secured, Due June 2024 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.67%        
Long-term Debt, Gross $ 42,850   54,443    
Securitization Bonds, 4.38% Series Senior Secured, Due November 2023 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.38%        
Long-term Debt, Gross $ 106,214   155,969    
Securitization Bonds, 5.93% Series Senior Secured, Series A, Due June 2022 [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 5.93%        
Long-term Debt, Gross $ 17,478   50,289    
Securitization Bonds [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 0   7,259    
Securitization Bonds [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 10,980   34,185    
Securitization Bonds [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 42,850   54,443    
Securitization Bonds [Member] | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 123,692   $ 206,258    
3.0% Unsecured Term Loan due May 2022 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.00%   3.00%    
Long-term Debt, Gross $ 70,000   $ 70,000    
Entergy Corporation Notes Due September 2020 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 0.00%   5.125%    
Long-term Debt, Gross $ 0   $ 450,000    
Entergy Corporation Notes Due July Two Thousand Twenty Two [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 4.00%   4.00%    
Long-term Debt, Gross $ 650,000   $ 650,000    
Entergy Corporation Notes Due September Two Thousand Twenty Six [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.95%   2.95%    
Long-term Debt, Gross $ 750,000   $ 750,000    
Vermont Yankee Credit Facility [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.46%   3.93%    
Long-term Debt, Gross $ 139,000   $ 139,000    
5 Year Credit Facility [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.35%   3.77%    
Long-term Debt, Gross $ 165,000   $ 440,000    
Entergy Arkansas VIE Credit Facility [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.94%   3.33%    
Long-term Debt, Gross $ 12,200   $ 15,100    
Entergy Louisiana River Bend VIE Credit Facility [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.95%   3.23%    
Long-term Debt, Gross $ 18,900   $ 70,300    
Entergy Louisiana Waterford VIE Credit Facility [Member] | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.72%   3.30%    
Long-term Debt, Gross $ 39,300   $ 49,900    
System Energy VIE Credit Facility [Member] | System Energy [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.63%   3.34%    
Long-term Debt, Gross $ 0   $ 31,600    
Long-Term DOE Obligation [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 192,018   191,114    
Long-Term DOE Obligation [Member] | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 192,018   191,114    
Grand Gulf Lease Obligation [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 34,336   34,346    
Grand Gulf Lease Obligation, 5.13% [Member] | System Energy [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross 34,336   34,346    
Payable to Entergy Louisiana due November 2035 [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 12,529   $ 14,367    
Credit Facility due November 2021, weighted avg rate 2.92% [Member] | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 0.00%   2.92%    
Long-term Debt, Gross $ 0   $ 20,000    
Entergy Corporation Notes Due September Two Thousand Twenty Five          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 0.90%   0.00%    
Long-term Debt, Gross $ 800,000   $ 0    
Entergy Corporation Notes Due June Twenty Thirty          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.80%   0.00%    
Long-term Debt, Gross $ 600,000   $ 0    
Entergy Corporation Notes Due June Twenty Fifty          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.75%   0.00%    
Long-term Debt, Gross $ 600,000   $ 0    
Mortgage Bonds Two Point Six Five Percent Series DueJune 2051 | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.65%        
Long-term Debt, Gross $ 675,000   0    
Credit Facility due September 2022, weighted avg rate 1.94% | Entergy Arkansas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.94%        
Long-term Debt, Gross $ 12,200   15,100    
Mortgage Bonds Zero Point Six Two Percent Series Due November Two Thousand Twenty Three | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 0.62% 0.62%      
Long-term Debt, Gross $ 1,100,000   0    
Mortgage Bonds, One Point Six Percent Series, Due December Twenty Thirty | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.60%        
Long-term Debt, Gross $ 300,000   0    
Mortgage Bonds, Two Point Nine Percent Series due March Twenty Fifty One | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.90%        
Long-term Debt, Gross $ 650,000   0    
Variable Interest Entity Notes Payable, Two Point Five One Percent Series V, Due June Twenty Twenty Seven | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.51%        
Long-term Debt, Gross $ 70,000   0    
Credit Facility due September 2022, weighted avg rate 1.95% | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.95%        
Long-term Debt, Gross $ 18,900   70,300    
Credit Facility due September 2022, weighted avg rate 1.72% | Entergy Louisiana [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.72%        
Long-term Debt, Gross $ 39,300   49,900    
Mortgage bonds, 3.50% Series due June 2051 | Entergy Mississippi [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.50%        
Long-term Debt, Gross $ 170,000   0    
Mortgage Bonds Three Percent Series Due March Twenty Twenty Five | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.00%        
Long-term Debt, Gross $ 78,000   0    
Mortgage Bonds, 3.75% Series Due March Twenty Forty | Entergy New Orleans [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.75%        
Long-term Debt, Gross $ 62,000   0    
1.75% Series First Mortgage Bonds Due March Twenty Thirty One | Entergy Texas [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.75%        
Long-term Debt, Gross $ 600,000   0    
Mortgage Bonds 2.14% Series Due December Twenty Twenty Five | System Energy [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.14%        
Long-term Debt, Gross $ 200,000   0    
Variable Interest Entity Notes Payable, 2.05% Series K Due September Twenty Twenty Seven | System Energy [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 2.05%        
Long-term Debt, Gross $ 90,000   0    
Credit Facility due September 2022, weighted avg rate 1.63% | System Energy [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 1.63%        
Long-term Debt, Gross $ 0   $ 31,600