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Rate And Regulatory Matters Rate and Regulatory Matters (Tables) - FERC April 2020 Order [Member]
 9 Months Ended
Sep. 30, 2020
Entergy Arkansas [Member]  
Payments Or Receipts Among Utility Operating Companies Related to System Agreement Proceedings [Table Text Block] Also in June 2020, Entergy filed bandwidth true-up payments and receipts for the 2010-2012 test years to address the FERC’s April 2020 rehearing order:
Payments (Receipts)
(In Millions)
Entergy Arkansas($2.8)
Entergy Louisiana$2.3
Entergy Mississippi$0.2
Entergy New Orleans($0.1)
Entergy Texas$0.4
Entergy Louisiana [Member]  
Payments Or Receipts Among Utility Operating Companies Related to System Agreement Proceedings [Table Text Block] Also in June 2020, Entergy filed bandwidth true-up payments and receipts for the 2010-2012 test years to address the FERC’s April 2020 rehearing order:
Payments (Receipts)
(In Millions)
Entergy Arkansas($2.8)
Entergy Louisiana$2.3
Entergy Mississippi$0.2
Entergy New Orleans($0.1)
Entergy Texas$0.4
Entergy Mississippi [Member]  
Payments Or Receipts Among Utility Operating Companies Related to System Agreement Proceedings [Table Text Block] Also in June 2020, Entergy filed bandwidth true-up payments and receipts for the 2010-2012 test years to address the FERC’s April 2020 rehearing order:
Payments (Receipts)
(In Millions)
Entergy Arkansas($2.8)
Entergy Louisiana$2.3
Entergy Mississippi$0.2
Entergy New Orleans($0.1)
Entergy Texas$0.4
Entergy New Orleans [Member]  
Payments Or Receipts Among Utility Operating Companies Related to System Agreement Proceedings [Table Text Block] Also in June 2020, Entergy filed bandwidth true-up payments and receipts for the 2010-2012 test years to address the FERC’s April 2020 rehearing order:
Payments (Receipts)
(In Millions)
Entergy Arkansas($2.8)
Entergy Louisiana$2.3
Entergy Mississippi$0.2
Entergy New Orleans($0.1)
Entergy Texas$0.4
Entergy Texas [Member]  
Payments Or Receipts Among Utility Operating Companies Related to System Agreement Proceedings [Table Text Block] Also in June 2020, Entergy filed bandwidth true-up payments and receipts for the 2010-2012 test years to address the FERC’s April 2020 rehearing order:
Payments (Receipts)
(In Millions)
Entergy Arkansas($2.8)
Entergy Louisiana$2.3
Entergy Mississippi$0.2
Entergy New Orleans($0.1)
Entergy Texas$0.4