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Commitments and Contingencies (Entergy Corporation, Entergy Arkansas, Entergy Gulf States Louisiana, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Maximum amounts of possible assessments per occurrence
Amount of possible assessments per occurrence, Maximum	1,300.00
Insurance-related Assessments [Member] \| Entergy Wholesale Commodities [Member]
Maximum amounts of possible assessments per occurrence
Amount of possible assessments per occurrence, Maximum	0
Insurance-related Assessments [Member] \| Entergy Arkansas \| Utility [Member]
Maximum amounts of possible assessments per occurrence
Amount of possible assessments per occurrence, Maximum	20.10
Insurance-related Assessments [Member] \| Entergy Gulf States Louisiana \| Utility [Member]
Maximum amounts of possible assessments per occurrence
Amount of possible assessments per occurrence, Maximum	16.30
Insurance-related Assessments [Member] \| Entergy Louisiana [Member] \| Utility [Member]
Maximum amounts of possible assessments per occurrence
Amount of possible assessments per occurrence, Maximum	19.30
Insurance-related Assessments [Member] \| Entergy Mississippi [Member] \| Utility [Member]
Maximum amounts of possible assessments per occurrence
Amount of possible assessments per occurrence, Maximum	0.07
Insurance-related Assessments [Member] \| Entergy New Orleans [Member] \| Utility [Member]
Maximum amounts of possible assessments per occurrence
Amount of possible assessments per occurrence, Maximum	0.07
Insurance-related Assessments [Member] \| Entergy Texas [Member] \| Utility [Member]
Maximum amounts of possible assessments per occurrence
Maximum amount of possible assessments per occurrence	N/A
Insurance-related Assessments [Member] \| System Energy [Member] \| Utility [Member]
Maximum amounts of possible assessments per occurrence
Amount of possible assessments per occurrence, Maximum	16.30

Describes the estimated range of loss from the specified contingency when no single amount within the range appears to be a better estimate than any other amount within the range, may disclose the factors that could cause the estimate to change, and may indicate that a material change in estimate might occur based on a reasonably possible change in circumstances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 14

-Paragraph 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6143-108592

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 94-6

-Paragraph 13, 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References+ Details