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Retirement And Other Postretirement Benefits (Components Of Qualified Net Pension Cost) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Pension Plans Defined Benefit [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period $ 43,542,000 $ 37,691,000 $ 131,644,000 $ 113,073,000
Interest cost on projected benefit obligation 65,464,000 65,232,000 195,996,000 195,696,000
Expected return on assets (81,898,000) (79,356,000) (245,394,000) (238,068,000)
Amortization of prior service cost (credit) 531,000 683,000 1,665,000 2,049,000
Amortization of loss 54,156,000 41,820,000 164,058,000 125,460,000
Defined Benefit Plan, Net Periodic Benefit Cost 83,099,000 66,070,000 249,273,000 198,210,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments 1,304,000   1,304,000  
Pension Plans Defined Benefit [Member] | Entergy Arkansas [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 6,371,000 5,542,000 19,113,000 16,626,000
Interest cost on projected benefit obligation 13,550,000 13,922,000 40,650,000 41,766,000
Expected return on assets (16,717,000) (16,441,000) (50,151,000) (49,323,000)
Amortization of prior service cost (credit) 6,000 50,000 18,000 150,000
Amortization of loss 12,544,000 10,193,000 37,631,000 30,579,000
Defined Benefit Plan, Net Periodic Benefit Cost 15,754,000 13,266,000 47,261,000 39,798,000
Pension Plans Defined Benefit [Member] | Entergy Gulf States Louisiana [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 3,599,000 3,068,000 10,797,000 9,204,000
Interest cost on projected benefit obligation 6,657,000 6,420,000 19,971,000 19,260,000
Expected return on assets (8,734,000) (8,593,000) (26,202,000) (25,779,000)
Amortization of prior service cost (credit) 2,000 5,000 6,000 15,000
Amortization of loss 5,933,000 4,043,000 17,800,000 12,129,000
Defined Benefit Plan, Net Periodic Benefit Cost 7,457,000 4,943,000 22,372,000 14,829,000
Pension Plans Defined Benefit [Member] | Entergy Louisiana [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 4,334,000.000 3,669,000 13,002,000 11,007,000
Interest cost on projected benefit obligation 8,644,000.000 8,800,000 25,932,000 26,400,000
Expected return on assets (10,454,000.000) (10,209,000) (31,362,000) (30,627,000)
Amortization of prior service cost (credit) 21,000.000 52,000 63,000 156,000
Amortization of loss 8,727,000.000 7,050,000 26,181,000 21,150,000
Defined Benefit Plan, Net Periodic Benefit Cost 11,272,000.000 9,362,000 33,816,000 28,086,000
Pension Plans Defined Benefit [Member] | Entergy Mississippi [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 1,842,000.000 1,602,000 5,526,000 4,806,000
Interest cost on projected benefit obligation 3,930,000.000 4,070,000 11,790,000 12,210,000
Expected return on assets (5,279,000.000) (5,236,000) (15,837,000) (15,708,000)
Amortization of prior service cost (credit) 2,000.000 7,000 6,000 21,000
Amortization of loss 3,344,000.000 2,633,000 10,032,000 7,899,000
Defined Benefit Plan, Net Periodic Benefit Cost 3,839,000.000 3,076,000 11,517,000 9,228,000
Pension Plans Defined Benefit [Member] | Entergy New Orleans
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 832,000.000 706,000 2,496,000 2,118,000
Interest cost on projected benefit obligation 1,849,000.000 1,902,000 5,547,000 5,706,000
Expected return on assets (2,270,000.000) (2,215,000) (6,810,000) (6,645,000)
Amortization of prior service cost (credit)   2,000   6,000
Amortization of loss 2,011,000.000 1,719,000 6,033,000 5,157,000
Defined Benefit Plan, Net Periodic Benefit Cost 2,422,000.000 2,114,000 7,266,000 6,342,000
Pension Plans Defined Benefit [Member] | Entergy Texas [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 1,637,000.000 1,421,000 4,911,000 4,263,000
Interest cost on projected benefit obligation 4,055,000.000 4,206,000 12,165,000 12,618,000
Expected return on assets (5,566,000.000) (5,581,000) (16,698,000) (16,743,000)
Amortization of prior service cost (credit) 2,000.000 4,000 6,000 12,000
Amortization of loss 3,373,000.000 2,544,000 10,118,000 7,632,000
Defined Benefit Plan, Net Periodic Benefit Cost 3,501,000.000 2,594,000 10,502,000 7,782,000
Pension Plans Defined Benefit [Member] | System Energy [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 1,836,000.000 1,480,000 5,508,000 4,440,000
Interest cost on projected benefit obligation 3,016,000.000 3,247,000 9,048,000 9,741,000
Expected return on assets (4,299,000.000) (4,109,000) (12,897,000) (12,327,000)
Amortization of prior service cost (credit) 3,000.000 3,000 9,000 9,000
Amortization of loss 2,429,000.000 2,251,000 7,286,000 6,753,000
Defined Benefit Plan, Net Periodic Benefit Cost 2,985,000.000 2,872,000 8,954,000 8,616,000
Other Postretirement [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 18,917,000 17,221,000 56,751,000 51,663,000
Interest cost on projected benefit obligation 19,766,000 20,640,000 59,298,000 61,920,000
Expected return on assets (9,950,000) (8,626,000) (29,850,000) (25,878,000)
Amortization of transition obligation   794,000   2,382,000
Amortization of prior service cost (credit) (3,334,000) (4,541,000) (10,002,000) (13,623,000)
Amortization of loss 11,304,000 9,113,000 33,912,000 27,339,000
Defined Benefit Plan, Net Periodic Benefit Cost 36,703,000 34,601,000 110,109,000 103,803,000
Other Postretirement [Member] | Entergy Arkansas [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 2,414,000.000 2,272,000.000 7,242,000 6,816,000
Interest cost on projected benefit obligation 3,360,000.000 3,613,000.000 10,080,000 10,839,000
Expected return on assets (4,149,000.000) (3,507,000.000) (12,447,000) (10,521,000)
Amortization of transition obligation   205,000.000   615,000
Amortization of prior service cost (credit) (133,000.000) (133,000.000) (399,000) (399,000)
Amortization of loss 2,041,000.000 2,077,000.000 6,124,000 6,231,000
Defined Benefit Plan, Net Periodic Benefit Cost 3,533,000.000 4,527,000.000 10,600,000 13,581,000
Other Postretirement [Member] | Entergy Gulf States Louisiana [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 2,001,000.000 1,880,000.000 6,003,000 5,640,000
Interest cost on projected benefit obligation 2,226,000.000 2,398,000.000 6,678,000 7,194,000
Amortization of transition obligation   60,000.000   180,000
Amortization of prior service cost (credit) (206,000.000) (206,000.000) (618,000) (618,000)
Amortization of loss 1,173,000.000 1,184,000.000 3,520,000 3,552,000
Defined Benefit Plan, Net Periodic Benefit Cost 5,194,000.000 5,316,000.000 15,583,000 15,948,000
Other Postretirement [Member] | Entergy Louisiana [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 2,172,000.000 1,949,000.000 6,516,000 5,847,000
Interest cost on projected benefit obligation 2,349,000.000 2,445,000.000 7,047,000 7,335,000
Amortization of transition obligation   96,000.000   288,000
Amortization of prior service cost (credit) (62,000.000) (62,000.000) (186,000) (186,000)
Amortization of loss 1,288,000.000 1,090,000.000 3,862,000 3,270,000
Defined Benefit Plan, Net Periodic Benefit Cost 5,747,000.000 5,518,000.000 17,239,000 16,554,000
Other Postretirement [Member] | Entergy Mississippi [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 819,000.000 773,000.000 2,457,000 2,319,000
Interest cost on projected benefit obligation 1,074,000.000 1,179,000.000 3,222,000 3,537,000
Expected return on assets (1,317,000.000) (1,130,000.000) (3,951,000) (3,390,000)
Amortization of transition obligation   88,000.000   264,000
Amortization of prior service cost (credit) (35,000.000) (35,000.000) (105,000) (105,000)
Amortization of loss 662,000.000 730,000.000 1,987,000 2,190,000
Defined Benefit Plan, Net Periodic Benefit Cost 1,203,000.000 1,605,000.000 3,610,000 4,815,000
Other Postretirement [Member] | Entergy New Orleans
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 447,000.000 422,000.000 1,341,000 1,266,000
Interest cost on projected benefit obligation 785,000.000 856,000.000 2,355,000 2,568,000
Expected return on assets (1,014,000.000) (928,000.000) (3,042,000) (2,784,000)
Amortization of transition obligation   297,000.000   891,000
Amortization of prior service cost (credit) 10,000.000 10,000.000 30,000 30,000
Amortization of loss 396,000.000 390,000.000 1,189,000 1,170,000
Defined Benefit Plan, Net Periodic Benefit Cost 624,000.000 1,047,000.000 1,873,000 3,141,000
Other Postretirement [Member] | Entergy Texas [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 950,000.000 913,000.000 2,850,000 2,739,000
Interest cost on projected benefit obligation 1,515,000.000 1,663,000.000 4,545,000 4,989,000
Expected return on assets (2,321,000.000) (2,104,000.000) (6,963,000) (6,312,000)
Amortization of transition obligation   47,000.000   141,000
Amortization of prior service cost (credit) (107,000.000) (107,000.000) (321,000) (321,000)
Amortization of loss 976,000.000 1,079,000.000 2,927,000 3,237,000
Defined Benefit Plan, Net Periodic Benefit Cost 1,013,000.000 1,491,000.000 3,038,000 4,473,000
Other Postretirement [Member] | System Energy [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the period 907,000.000 823,000.000 2,721,000 2,469,000
Interest cost on projected benefit obligation 729,000.000 757,000.000 2,187,000 2,271,000
Expected return on assets (825,000.000) (650,000.000) (2,475,000) (1,950,000)
Amortization of transition obligation   2,000.000   6,000
Amortization of prior service cost (credit) (16,000.000) (16,000.000) (48,000) (48,000)
Amortization of loss 479,000.000 493,000.000 1,437,000 1,479,000
Defined Benefit Plan, Net Periodic Benefit Cost 1,274,000.000 1,409,000.000 3,822,000 4,227,000
Non-Qualified Pension Plans [Member] | Parent Company [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost 33,100,000 5,100,000 44,100,000 15,300,000
Non-Qualified Pension Plans [Member] | Entergy Arkansas [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost 121,000 107,000 326,000 321,000
Non-Qualified Pension Plans [Member] | Entergy Gulf States Louisiana [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost 38,000 39,000 113,000 117,000
Non-Qualified Pension Plans [Member] | Entergy Louisiana [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost 3,000 3,000 9,000 9,000
Non-Qualified Pension Plans [Member] | Entergy Mississippi [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost 46,000 46,000 139,000 138,000
Non-Qualified Pension Plans [Member] | Entergy New Orleans
       
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost 22,000 19,000 68,000 57,000
Non-Qualified Pension Plans [Member] | Entergy Texas [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost $ 560,000 $ 163,000 $ 857,000 $ 489,000