Rate And Regulatory Matters (Correction Of Regulatory Asset For Income Taxes, Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Regulatory asset for income taxes - net	$ 738,734	$ 799,006
Accumulated deferred income taxes - current	83,107	99,929
Accumulated deferred income taxes and taxes accrued	7,963,476	8,096,452
Member's equity	9,123,996	9,055,270	8,691,566	8,590,400
Entergy Arkansas [Member]
Regulatory asset for income taxes - net	80,502	87,357
Accumulated deferred income taxes - current	48,783	124,267
Accumulated deferred income taxes and taxes accrued	1,816,919	1,708,760
Member's equity	1,500,316	1,444,124	1,447,375	1,403,906
Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net	172,557	173,724
Accumulated deferred income taxes - current	22,195	5,107
Accumulated deferred income taxes and taxes accrued	1,331,457	1,368,563
Member's equity	1,402,035	1,333,776	1,439,866	1,464,289
Entergy Louisiana [Member]
Regulatory asset for income taxes - net	189,712	175,952
Accumulated deferred income taxes - current	8,204	4,690
Accumulated deferred income taxes and taxes accrued	959,296	1,098,690
Member's equity	2,726,123	2,564,929	2,218,698	2,136,871
Entergy Mississippi [Member]
Regulatory asset for income taxes - net	64,258	65,196
Accumulated deferred income taxes and taxes accrued	673,514	672,129
Member's equity	858,888	835,706	769,534	733,105
Entergy New Orleans
Accumulated deferred income taxes and taxes accrued	139,005	144,405
Member's equity	186,209	181,165	192,206	188,154
Entergy Texas [Member]
Regulatory asset for income taxes - net	128,635	129,924
Accumulated deferred income taxes and taxes accrued	926,510	934,990
Member's equity	872,303	899,355	863,113	824,290
System Energy [Member]
Regulatory asset for income taxes - net	131,603	124,777
Accumulated deferred income taxes - current	18,760	3,428
Accumulated deferred income taxes and taxes accrued	729,466	652,418
Member's equity	829,717	800,563	814,388	812,366
As Previously Reported [Member] \| Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net		249,058
Accumulated deferred income taxes - current		5,427
Accumulated deferred income taxes and taxes accrued		1,397,230
Member's equity			1,482,746	1,509,213
As Corrected [Member] \| Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net		173,724
Accumulated deferred income taxes - current		5,107
Accumulated deferred income taxes and taxes accrued		1,368,563
Member's equity			1,439,866	1,464,289
Member's Equity [Member] \| Entergy Gulf States Louisiana [Member]
Member's equity	1,450,110	1,393,386	1,468,941	1,494,593
Member's Equity [Member] \| Entergy Louisiana [Member]
Member's equity	2,664,370	2,504,436	2,142,559	2,061,833
Member's Equity [Member] \| As Previously Reported [Member] \| Entergy Gulf States Louisiana [Member]
Member's equity		1,439,733	1,511,821	1,539,517
Member's Equity [Member] \| As Corrected [Member] \| Entergy Gulf States Louisiana [Member]
Member's equity		$ 1,393,386	$ 1,468,941	$ 1,494,593

Represents the current portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A current taxable temporary difference is a difference between the tax basis and the carrying amount of a current asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise separates deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, is classified according to the expected reversal date of the temporary difference.

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Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise separates deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, are classified according to the expected reversal date of the temporary difference.

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- Definition

Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.

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