XML 74 R133.htm IDEA: XBRL DOCUMENT v2.4.0.6
Risk Management and Fair Values (Assets And Liabilities At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets at fair value on a recurring basis    
Assets other than temporary cash investments $ 4,190.0 $ 3,788.0
Liabilities at fair value on a recurring basis    
Average Coupon Rate of Debt Securities Percentage 3.78%  
Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 420.0 613.0
Assets other than temporary cash investments   5,098.0
Total 5,233.0  
Liabilities at fair value on a recurring basis    
Total 21  
Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 8.0  
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis   30.0
Power Contracts Liabilities [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 13.0  
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 2,459.0 2,129.0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 1,731.0 1,659.0
Power Contracts Assets [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 191.0 312.0
Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 46.0 50.0
Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 386.0 335.0
Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 420.0 613.0
Assets other than temporary cash investments   2,034.0
Total 1,979.0  
Liabilities at fair value on a recurring basis    
Total 8  
Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 8.0  
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis   30.0
Fair Value Inputs Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 358.0 397.0
Fair Value Inputs Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 769.0 639.0
Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 46.0 50.0
Fair Value Inputs Level 1 [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 386.0 335.0
Fair Value Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments   2,752.0
Total 3,063.0  
Fair Value Inputs Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 2,101.0 1,732.0
Fair Value Inputs Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 962.0 1,020.0
Fair Value Inputs Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments   312.0
Total 191.0  
Liabilities at fair value on a recurring basis    
Total 13  
Fair Value Inputs Level 3 [Member] | Power Contracts Liabilities [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 13.0  
Fair Value Inputs Level 3 [Member] | Power Contracts Assets [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 191.0 312.0
Entergy Arkansas [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 600.6 541.7
Liabilities at fair value on a recurring basis    
Average Coupon Rate of Debt Securities Percentage 3.24%  
Entergy Arkansas [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 24.9 17.9
Total 667.9 563.5
Entergy Arkansas [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 384.0 [1] 329.4 [1]
Entergy Arkansas [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 216.6 [1] 212.3 [1]
Entergy Arkansas [Member] | Securitization Recovery Trust Account [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments   3.9
Entergy Arkansas [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 4.4  
Entergy Arkansas [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 38.0  
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 24.9 17.9
Total 171.1 110.9
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 9.5 [1] 6.3 [1]
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 94.3 [1] 82.8 [1]
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments   3.9
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 4.4  
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 38.0  
Entergy Arkansas [Member] | Fair Value Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Total 496.8 452.6
Entergy Arkansas [Member] | Fair Value Inputs Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 374.5 [1] 323.1 [1]
Entergy Arkansas [Member] | Fair Value Inputs Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 122.3 [1] 129.5 [1]
Entergy Gulf States Louisiana [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 477.4 420.9
Liabilities at fair value on a recurring basis    
Average Coupon Rate of Debt Securities Percentage 4.74%  
Entergy Gulf States Louisiana [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 0.6 24.6
Total 565.0 535.7
Entergy Gulf States Louisiana [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 2.6 8.6
Entergy Gulf States Louisiana [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 288.5 [1] 238.7 [1]
Entergy Gulf States Louisiana [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 188.9 [1] 182.2 [1]
Entergy Gulf States Louisiana [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 87.0 90.2
Entergy Gulf States Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 0.6 24.6
Total 142.6 159.4
Entergy Gulf States Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 2.6 8.6
Entergy Gulf States Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 5.5 [1] 5.1 [1]
Entergy Gulf States Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 49.5 [1] 39.5 [1]
Entergy Gulf States Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 87.0 90.2
Entergy Gulf States Louisiana [Member] | Fair Value Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Total 422.4 376.3
Entergy Gulf States Louisiana [Member] | Fair Value Inputs Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 283.0 [1] 233.6 [1]
Entergy Gulf States Louisiana [Member] | Fair Value Inputs Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 139.4 [1] 142.7 [1]
Entergy Louisiana [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 287.4 254.0
Liabilities at fair value on a recurring basis    
Average Coupon Rate of Debt Securities Percentage 3.64%  
Entergy Louisiana [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 29.3  
Total 508.1 460.4
Entergy Louisiana [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 3.4 12.4
Entergy Louisiana [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 175.5 [1] 149.2 [1]
Entergy Louisiana [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 111.9 104.8 [1]
Entergy Louisiana [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 4.4 5.2
Entergy Louisiana [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 187.0 201.2
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 29.3  
Total 275.3 260.9
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 3.4 12.4
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 2.0 [1] 2.9 [1]
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 52.6 51.6 [1]
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 4.4 5.2
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 187.0 201.2
Entergy Louisiana [Member] | Fair Value Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Total 232.8 199.5
Entergy Louisiana [Member] | Fair Value Inputs Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 173.5 [1] 146.3 [1]
Entergy Louisiana [Member] | Fair Value Inputs Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 59.3 53.2 [1]
Entergy Mississippi [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 52.4  
Total 114.2  
Entergy Mississippi [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 2.2 7.8
Entergy Mississippi [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 61.8 31.8
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 52.4  
Total 114.2  
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis 2.2 7.8
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 61.8 31.8
Entergy New Orleans [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 9.1  
Total 19.7  
Entergy New Orleans [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments   9.3
Total   21.3
Entergy New Orleans [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis   1.5
Entergy New Orleans [Member] | Escrow Accounts [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 10.6  
Entergy New Orleans [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments   12.0
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 9.1  
Total 19.7  
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments   9.3
Total   21.3
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member]
    
Liabilities at fair value on a recurring basis    
Liabilities, Fair Value Disclosure on Recurring Basis   1.5
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Escrow Accounts [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 10.6  
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Escrow Accounts [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments   12.0
Entergy Texas [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 59.7 65.1
Total 97.0 106.3
Entergy Texas [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 37.3 41.2
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 59.7 65.1
Total 97.0 106.3
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 37.3 41.2
System Energy [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 490.6 423.4
Liabilities at fair value on a recurring basis    
Average Coupon Rate of Debt Securities Percentage 2.60%  
System Energy [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 83.5  
Total 574.1 577.6
System Energy [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 283.6 [1] 237.2 [1]
System Energy [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 207.0 [1] 186.2 [1]
System Energy [Member] | Other Aggregated Investments [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments   154.2
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments 83.5  
Total 226.2 280.1
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 1.6 [1] 2.7 [1]
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 141.1 [1] 123.2 [1]
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Other Aggregated Investments [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Temporary cash investments   154.2
System Energy [Member] | Fair Value Inputs Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Total 347.9 297.5
System Energy [Member] | Fair Value Inputs Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments 282.0 [1] 234.5 [1]
System Energy [Member] | Fair Value Inputs Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
Assets at fair value on a recurring basis    
Assets other than temporary cash investments $ 65.9 [1] $ 63.0 [1]
[1] The decommissioning trust funds hold equity and fixed income securities. Equity securities are invested to approximate the returns of major market indices. Fixed income securities are held in various governmental and corporate securities. See Note 17 for additional information on the investment portfolios.