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Income Taxes Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2020
Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT [Table Text Block] The return of unprotected excess accumulated deferred income taxes reduced Entergy’s and the Registrant Subsidiaries’ regulatory liability for income taxes as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
2020201920202019
(In Millions)
Entergy$17 $96 $61 $219 
Entergy Arkansas($2)$41 $9 $99 
Entergy Louisiana$8 $17 $24 $31 
Entergy New Orleans$1 $7 $6 $9 
Entergy Texas$10 $31 $22 $73 
System Entergy$— $— $— $7 
Entergy Arkansas [Member]  
Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT [Table Text Block] The return of unprotected excess accumulated deferred income taxes reduced Entergy’s and the Registrant Subsidiaries’ regulatory liability for income taxes as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
2020201920202019
(In Millions)
Entergy$17 $96 $61 $219 
Entergy Arkansas($2)$41 $9 $99 
Entergy Louisiana$8 $17 $24 $31 
Entergy New Orleans$1 $7 $6 $9 
Entergy Texas$10 $31 $22 $73 
System Entergy$— $— $— $7 
Entergy Louisiana [Member]  
Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT [Table Text Block] The return of unprotected excess accumulated deferred income taxes reduced Entergy’s and the Registrant Subsidiaries’ regulatory liability for income taxes as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
2020201920202019
(In Millions)
Entergy$17 $96 $61 $219 
Entergy Arkansas($2)$41 $9 $99 
Entergy Louisiana$8 $17 $24 $31 
Entergy New Orleans$1 $7 $6 $9 
Entergy Texas$10 $31 $22 $73 
System Entergy$— $— $— $7 
Entergy Mississippi [Member]  
Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT [Table Text Block] The return of unprotected excess accumulated deferred income taxes reduced Entergy’s and the Registrant Subsidiaries’ regulatory liability for income taxes as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
2020201920202019
(In Millions)
Entergy$17 $96 $61 $219 
Entergy Arkansas($2)$41 $9 $99 
Entergy Louisiana$8 $17 $24 $31 
Entergy New Orleans$1 $7 $6 $9 
Entergy Texas$10 $31 $22 $73 
System Entergy$— $— $— $7 
Entergy New Orleans [Member]  
Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT [Table Text Block] The return of unprotected excess accumulated deferred income taxes reduced Entergy’s and the Registrant Subsidiaries’ regulatory liability for income taxes as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
2020201920202019
(In Millions)
Entergy$17 $96 $61 $219 
Entergy Arkansas($2)$41 $9 $99 
Entergy Louisiana$8 $17 $24 $31 
Entergy New Orleans$1 $7 $6 $9 
Entergy Texas$10 $31 $22 $73 
System Entergy$— $— $— $7 
Entergy Texas [Member]  
Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT [Table Text Block] The return of unprotected excess accumulated deferred income taxes reduced Entergy’s and the Registrant Subsidiaries’ regulatory liability for income taxes as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
2020201920202019
(In Millions)
Entergy$17 $96 $61 $219 
Entergy Arkansas($2)$41 $9 $99 
Entergy Louisiana$8 $17 $24 $31 
Entergy New Orleans$1 $7 $6 $9 
Entergy Texas$10 $31 $22 $73 
System Entergy$— $— $— $7 
System Energy [Member]  
Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT [Table Text Block] The return of unprotected excess accumulated deferred income taxes reduced Entergy’s and the Registrant Subsidiaries’ regulatory liability for income taxes as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
2020201920202019
(In Millions)
Entergy$17 $96 $61 $219 
Entergy Arkansas($2)$41 $9 $99 
Entergy Louisiana$8 $17 $24 $31 
Entergy New Orleans$1 $7 $6 $9 
Entergy Texas$10 $31 $22 $73 
System Entergy$— $— $— $7