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Income Taxes Income Taxes (Reduction to Regulatory Liability Due to Return of Unprotected Excess ADIT (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
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May 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes |  | $ 16 | $ 14 | $ 33 | $ 54
Reduction of income tax expense | $ 283 |  |  |  |
Entergy Arkansas [Member] |  |  |  |  |
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes |  | 0 | 0 | 0 | 8
Entergy Louisiana [Member] |  |  |  |  |
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes |  | 9 | 8 | 18 | 15
Reduction of income tax expense | 290 |  |  |  |
Regulatory charge recorded as a result of reduction in income tax expense | 224 |  |  |  |
Regulatory charge recorded as a result of reduction in income tax expense, net of tax | $ 165 |  |  |  |
Entergy New Orleans [Member] |  |  |  |  |
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes |  | 0 | 0 | 1 | 0
Entergy Texas [Member] |  |  |  |  |
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes |  | 7 | 6 | 14 | 13
System Energy [Member] |  |  |  |  |
Reduction to regulatory liability due to return of unprotected excess accumulated deferred income taxes |  | $ 0 | $ 0 | $ 0 | $ 18

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