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Income Taxes Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2021
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,
2021202020212020
(In Millions)
Entergy$17 $17 $72 $61 
Entergy Arkansas$— ($2)$8 $9 
Entergy Louisiana$8 $8 $24 $24 
Entergy New Orleans$— $1 $— $6 
Entergy Texas$9 $10 $22 $22 
System Energy$— $— $18 $— 
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,
2021202020212020
(In Millions)
Entergy$17 $17 $72 $61 
Entergy Arkansas$— ($2)$8 $9 
Entergy Louisiana$8 $8 $24 $24 
Entergy New Orleans$— $1 $— $6 
Entergy Texas$9 $10 $22 $22 
System Energy$— $— $18 $— 
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,
2021202020212020
(In Millions)
Entergy$17 $17 $72 $61 
Entergy Arkansas$— ($2)$8 $9 
Entergy Louisiana$8 $8 $24 $24 
Entergy New Orleans$— $1 $— $6 
Entergy Texas$9 $10 $22 $22 
System Energy$— $— $18 $— 
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,
2021202020212020
(In Millions)
Entergy$17 $17 $72 $61 
Entergy Arkansas$— ($2)$8 $9 
Entergy Louisiana$8 $8 $24 $24 
Entergy New Orleans$— $1 $— $6 
Entergy Texas$9 $10 $22 $22 
System Energy$— $— $18 $— 
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,
2021202020212020
(In Millions)
Entergy$17 $17 $72 $61 
Entergy Arkansas$— ($2)$8 $9 
Entergy Louisiana$8 $8 $24 $24 
Entergy New Orleans$— $1 $— $6 
Entergy Texas$9 $10 $22 $22 
System Energy$— $— $18 $— 
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,
2021202020212020
(In Millions)
Entergy$17 $17 $72 $61 
Entergy Arkansas$— ($2)$8 $9 
Entergy Louisiana$8 $8 $24 $24 
Entergy New Orleans$— $1 $— $6 
Entergy Texas$9 $10 $22 $22 
System Energy$— $— $18 $—