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Income Taxes Income Taxes (Tables)
 6 Months Ended
Jun. 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 June 30,		Six Months
Ended June 30,
2020201920202019
(In Millions)
Entergy$15  $61  $45  $122  
Entergy Arkansas($1) $25  $12  $57  
Entergy Louisiana$8  $7  $16  $14  
Entergy New Orleans$2  $2  $5  $2  
Entergy Texas$6  $20  $12  $42  
System Entergy$—  $7  $—  $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 June 30,		Six Months
Ended June 30,
2020201920202019
(In Millions)
Entergy$15  $61  $45  $122  
Entergy Arkansas($1) $25  $12  $57  
Entergy Louisiana$8  $7  $16  $14  
Entergy New Orleans$2  $2  $5  $2  
Entergy Texas$6  $20  $12  $42  
System Entergy$—  $7  $—  $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 June 30,		Six Months
Ended June 30,
2020201920202019
(In Millions)
Entergy$15  $61  $45  $122  
Entergy Arkansas($1) $25  $12  $57  
Entergy Louisiana$8  $7  $16  $14  
Entergy New Orleans$2  $2  $5  $2  
Entergy Texas$6  $20  $12  $42  
System Entergy$—  $7  $—  $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 June 30,		Six Months
Ended June 30,
2020201920202019
(In Millions)
Entergy$15  $61  $45  $122  
Entergy Arkansas($1) $25  $12  $57  
Entergy Louisiana$8  $7  $16  $14  
Entergy New Orleans$2  $2  $5  $2  
Entergy Texas$6  $20  $12  $42  
System Entergy$—  $7  $—  $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 June 30,		Six Months
Ended June 30,
2020201920202019
(In Millions)
Entergy$15  $61  $45  $122  
Entergy Arkansas($1) $25  $12  $57  
Entergy Louisiana$8  $7  $16  $14  
Entergy New Orleans$2  $2  $5  $2  
Entergy Texas$6  $20  $12  $42  
System Entergy$—  $7  $—  $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 June 30,		Six Months
Ended June 30,
2020201920202019
(In Millions)
Entergy$15  $61  $45  $122  
Entergy Arkansas($1) $25  $12  $57  
Entergy Louisiana$8  $7  $16  $14  
Entergy New Orleans$2  $2  $5  $2  
Entergy Texas$6  $20  $12  $42  
System Entergy$—  $7  $—  $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 June 30,		Six Months
Ended June 30,
2020201920202019
(In Millions)
Entergy$15  $61  $45  $122  
Entergy Arkansas($1) $25  $12  $57  
Entergy Louisiana$8  $7  $16  $14  
Entergy New Orleans$2  $2  $5  $2  
Entergy Texas$6  $20  $12  $42  
System Entergy$—  $7  $—  $7