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Income Taxes Income Taxes (Tables)
 6 Months Ended
Jun. 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 June 30,		Six Months
Ended June 30,
2021202020212020
(In Millions)
Entergy$14 $15 $54 $45 
Entergy Arkansas$— ($1)$8 $12 
Entergy Louisiana$8 $8 $15 $16 
Entergy New Orleans$— $2 $— $5 
Entergy Texas$6 $6 $13 $12 
System Entergy$— $— $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 June 30,		Six Months
Ended June 30,
2021202020212020
(In Millions)
Entergy$14 $15 $54 $45 
Entergy Arkansas$— ($1)$8 $12 
Entergy Louisiana$8 $8 $15 $16 
Entergy New Orleans$— $2 $— $5 
Entergy Texas$6 $6 $13 $12 
System Entergy$— $— $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 June 30,		Six Months
Ended June 30,
2021202020212020
(In Millions)
Entergy$14 $15 $54 $45 
Entergy Arkansas$— ($1)$8 $12 
Entergy Louisiana$8 $8 $15 $16 
Entergy New Orleans$— $2 $— $5 
Entergy Texas$6 $6 $13 $12 
System Entergy$— $— $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 June 30,		Six Months
Ended June 30,
2021202020212020
(In Millions)
Entergy$14 $15 $54 $45 
Entergy Arkansas$— ($1)$8 $12 
Entergy Louisiana$8 $8 $15 $16 
Entergy New Orleans$— $2 $— $5 
Entergy Texas$6 $6 $13 $12 
System Entergy$— $— $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 June 30,		Six Months
Ended June 30,
2021202020212020
(In Millions)
Entergy$14 $15 $54 $45 
Entergy Arkansas$— ($1)$8 $12 
Entergy Louisiana$8 $8 $15 $16 
Entergy New Orleans$— $2 $— $5 
Entergy Texas$6 $6 $13 $12 
System Entergy$— $— $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 June 30,		Six Months
Ended June 30,
2021202020212020
(In Millions)
Entergy$14 $15 $54 $45 
Entergy Arkansas$— ($1)$8 $12 
Entergy Louisiana$8 $8 $15 $16 
Entergy New Orleans$— $2 $— $5 
Entergy Texas$6 $6 $13 $12 
System Entergy$— $— $18 $—