Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Concentration Risk	10.00%
Change in Plan Assets
non-current pension liability	$ 3,036,010	$ 3,187,357
Current pension liability	76,942	62,513
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 5,171,202	4,707,433
Change in Plan Assets
Number of qualified pension plans \| plan	9
Accumulated pension benefit obligation	$ 6,700,000	6,300,000
Net periodic benefit costs	214,853	321,138	$ 216,477
Amortization of prior credit	1,079	1,561	1,600
Expected Employer Contributions	$ 408,600
Number of Final Average Pay Qualified Pension Plans in which Assets Held in Master Trust	7
Number of Qualified Pension Plans in which Registrant Subsidiaries Participate	4
Number of Cash Balance Pension Plans in which Asset Held in Second Master Trust	2
Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 5,171,202	4,707,433	4,827,966
Change in Plan Assets
Projected benefit obligation	7,142,567	6,848,238	7,230,542
non-current pension liability	1,971,365	2,140,805
Accumulated other comprehensive income (before taxes)	619,935	640,256
Other Postretirement Benefits [Member]
Change in Plan Assets
Expected Employer Contributions	53,100
Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	151,000	137,600
Net periodic benefit costs	24,900	22,800	32,400
Settlement charges related to the payment of lump sum benefits out of the plan	8,100	5,100	15,100
Projected benefit obligation	169,300	157,300
non-current pension liability	137,600	136,100
Current pension liability	31,700	21,200
Amortization of prior credit	59,800	58,800
Accumulated other comprehensive income (before taxes)	31,600	23,500
Defined Contribution Plans [Member]
Change in Plan Assets
Subsidiaries' contribution to defined contribution plan	$ 47,000	44,400	43,300
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Entergy Arkansas [Member]
Change in Plan Assets
non-current pension liability	$ 424,234	459,153
Entergy Arkansas [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	1,379,265	1,309,903
Net periodic benefit costs	37,601	62,683	42,365
Amortization of prior credit			0
Entergy Arkansas [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,041,592	959,618	977,521
Change in Plan Assets
Projected benefit obligation	1,454,310	1,400,511	1,485,718
non-current pension liability	412,718	440,893
Entergy Arkansas [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	3,439	4,495
Net periodic benefit costs	1,819	446	754
Projected benefit obligation	3,897	4,694
non-current pension liability	3,655	2,566
Current pension liability	242	2,128
Accumulated other comprehensive income (before taxes)	0	0
Settlement charges	1,400	337
Entergy Louisiana [Member]
Change in Plan Assets
non-current pension liability	780,278	833,185
Entergy Louisiana [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	1,513,884	1,436,535
Net periodic benefit costs	47,072	72,860	49,390
Amortization of prior credit			0
Entergy Louisiana [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,169,147	1,071,234	1,113,359
Change in Plan Assets
Projected benefit obligation	1,624,233	1,564,710	1,666,535
non-current pension liability	455,086	493,476
Entergy Louisiana [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	2,134	2,538
Net periodic benefit costs	231	377	135
Projected benefit obligation	2,134	2,550
non-current pension liability	1,901	2,313
Current pension liability	233	237
Accumulated other comprehensive income (before taxes)	13	41
Settlement charges		108
Entergy Mississippi [Member]
Change in Plan Assets
non-current pension liability	109,551	120,217
Entergy Mississippi [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	396,081	379,775
Net periodic benefit costs	9,510	16,412	9,988
Amortization of prior credit			0
Entergy Mississippi [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	314,349	292,297	301,250
Change in Plan Assets
Projected benefit obligation	419,201	408,604	432,169
non-current pension liability	104,852	116,307
Entergy Mississippi [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	1,961	1,802
Net periodic benefit costs	236	235	190
Projected benefit obligation	2,296	2,185
non-current pension liability	2,159	2,066
Current pension liability	137	119
Accumulated other comprehensive income (before taxes)	0	0
Settlement charges	1	2
Entergy New Orleans [Member]
Change in Plan Assets
non-current pension liability	36,750	43,609
Entergy New Orleans [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	186,247	176,692
Net periodic benefit costs	5,593	8,981	6,607
Amortization of prior credit			0
Entergy New Orleans [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	142,488	129,975	133,344
Change in Plan Assets
Projected benefit obligation	197,464	191,064	202,555
non-current pension liability	54,976	61,089
Entergy New Orleans [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	452	417
Net periodic benefit costs	65	64	95
Projected benefit obligation	514	468
non-current pension liability	495	449
Current pension liability	20	19
Accumulated other comprehensive income (before taxes)	0	0
Entergy Texas [Member]
Change in Plan Assets
non-current pension liability	67,313	77,517
Entergy Texas [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	365,251	359,687
Net periodic benefit costs	5,002	12,059	8,521
Amortization of prior credit			0
Entergy Texas [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	317,576	298,378	310,713
Change in Plan Assets
Projected benefit obligation	386,366	383,627	418,498
non-current pension liability	68,790	85,249
Entergy Texas [Member] \| Non-Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	8,333	8,460
Net periodic benefit costs	504	595	491
Projected benefit obligation	8,665	8,832
non-current pension liability	7,892	8,059
Current pension liability	773	773
Accumulated other comprehensive income (before taxes)	0	0
Settlement charges		16
System Energy [Member]
Change in Plan Assets
non-current pension liability	117,850	112,264
System Energy [Member] \| Qualified Pension Plans [Member]
Change in Plan Assets
Accumulated pension benefit obligation	315,131	286,917
Net periodic benefit costs	10,808	16,581	12,229
Amortization of prior credit			2
System Energy [Member] \| Qualified Pension Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	235,144	212,006	217,621
Change in Plan Assets
Projected benefit obligation	335,381	311,542	$ 334,312
non-current pension liability	$ 100,237	$ 99,536
Minimum [Member] \| Defined Contribution Plans [Member]
Change in Plan Assets
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	70.00%
Maximum [Member] \| Defined Contribution Plans [Member]
Change in Plan Assets
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Domestic Equity Securities [Member] \| Non-Taxables [Member]
Change in Plan Assets
Target asset allocation	39.00%
Domestic Equity Securities [Member] \| Qualified Pension And Other Postretirement Plans [Member]
Change in Plan Assets
Target asset allocation	45.00%
International Equity Securities [Member] \| Non-Taxables [Member]
Change in Plan Assets
Target asset allocation	26.00%
International Equity Securities [Member] \| Qualified Pension And Other Postretirement Plans [Member]
Change in Plan Assets
Target asset allocation	20.00%
Fixed Income Securities [Member] \| Non-Taxables [Member]
Change in Plan Assets
Target asset allocation	35.00%
Fixed Income Securities [Member] \| Qualified Pension And Other Postretirement Plans [Member]
Change in Plan Assets
Target asset allocation	35.00%

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Defined Benefit Plan Number Of Qualified Pension Plans

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Number of Final Average Pay Qualified Pension Plans in which Assets Held in Master Trust

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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The amount of the cost recognized during the period for defined contribution plans.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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