Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Decommissioning Fund Investments	$ 5,514,016	$ 7,253,215
Asset Retirement Obligation	4,757,100	6,469,500	$ 6,159,200
Entergy Louisiana [Member]
Decommissioning Fund Investments	2,114,523	1,794,042
Asset Retirement Obligation	1,653,200	1,573,300	1,497,300
System Energy [Member]
Decommissioning Fund Investments	1,385,254	1,215,868
Asset Retirement Obligation	1,007,600	968,900	931,700
Entergy Arkansas [Member]
Decommissioning Fund Investments	1,438,416	1,273,921
Asset Retirement Obligation	1,390,400	1,314,200	1,242,600
Entergy Mississippi [Member]
Asset Retirement Obligation	$ 10,300	$ 9,800	$ 9,700

Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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