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Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Book Value And The Fair Value Of Long-Term Debt) (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Short-term Debt [Line Items]    
Long-term Debt, Fair Value $ 12,294,254,000 $ 12,849,330,000
Long-term Debt, Book Value 12,481,752,000 12,638,834,000
Notes payable to power authority 112,000,000 110,000,000
Entergy Arkansas [Member]
   
Short-term Debt [Line Items]    
Long-term Debt, Fair Value 2,159,737,000 1,876,335,000
Long-term Debt, Book Value 2,412,168,000 2,123,895,000
Long term DOE obligations 181,000,000 181,000,000
Entergy Gulf States Louisiana [Member]
   
Short-term Debt [Line Items]    
Long-term Debt, Fair Value 1,605,999,000 1,668,819,000
Long-term Debt, Book Value 1,543,608,000 1,517,429,000
Entergy Louisiana [Member]
   
Short-term Debt [Line Items]    
Long-term Debt, Fair Value 3,184,097,000 2,921,322,000
Long-term Debt, Book Value 3,229,316,000 2,826,095,000
Capital Lease Obligations 149,000,000 163,000,000
Entergy Mississippi [Member]
   
Short-term Debt [Line Items]    
Long-term Debt, Fair Value 1,083,993,000 1,230,714,000
Long-term Debt, Book Value 1,069,627,000 1,169,519,000
Entergy New Orleans
   
Short-term Debt [Line Items]    
Long-term Debt, Fair Value 220,675,000 200,725,000
Long-term Debt, Book Value 225,942,000 196,300,000
Entergy Texas [Member]
   
Short-term Debt [Line Items]    
Long-term Debt, Fair Value 1,736,764,000 1,885,672,000
Long-term Debt, Book Value 1,567,566,000 1,617,813,000
System Energy [Member]
   
Short-term Debt [Line Items]    
Long-term Debt, Fair Value 576,502,000 664,670,000
Long-term Debt, Book Value 672,406,000 783,799,000
Capital Lease Obligations $ 97,000,000 $ 139,000,000