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Decommissioning Trust Funds (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Decommissioning Trust Funds [Abstract] |  |  |  |  |
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts |  |  | $ 365,000,000 |  | $ 329,000,000
Amortized cost of debt securities | 1,921,000,000 |  | 1,921,000,000 |  | 1,843,000,000
Average coupon rate of debt securities | 3.33% |  | 3.33% |  |
Average duration of debt securities, years |  |  | 5 years 4 months 28 days |  |
Average maturity of debt securities, years |  |  | 7 years 11 months 5 days |  |
Proceeds from the dispositions of debt securities | 445,000,000 | 382,000,000 | 982,000,000 | 780,000,000 |
Gains from dispositions of debt securities, gross | 6,000,000 | 16,000,000 | 12,000,000 | 22,000,000 |
Losses from dispositions of debt securities, gross | 1,000,000 | 1,000,000 | 3,000,000 | 3,000,000 |
Entergy Arkansas [Member] |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |
Amortized cost of debt securities | 260,200,000 |  | 260,200,000 |  | 248,900,000
Average coupon rate of debt securities | 2.68% |  | 2.68% |  |
Average duration of debt securities, years |  |  | 4 years 9 months 30 days |  |
Average maturity of debt securities, years |  |  | 5 years 6 months 9 days |  |
Proceeds from the dispositions of debt securities | 25,000,000 | 87,000,000 | 70,300,000 | 143,100,000 |
Gains from dispositions of debt securities, gross | 300,000 | 7,300,000 | 400,000 | 8,700,000 |
Losses from dispositions of debt securities, gross | 100,000 | 10,000 | 300,000 | 100,000 |
Entergy Gulf States Louisiana [Member] |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |
Amortized cost of debt securities | 222,800,000 |  | 222,800,000 |  | 199,100,000
Average coupon rate of debt securities | 4.46% |  | 4.46% |  |
Average duration of debt securities, years |  |  | 5 years 9 months 23 days |  |
Average maturity of debt securities, years |  |  | 9 years 5 months 17 days |  |
Proceeds from the dispositions of debt securities | 45,100,000 | 23,400,000 | 75,400,000 | 46,700,000 |
Gains from dispositions of debt securities, gross | 500,000 | 5,200,000 | 700,000 | 6,300,000 |
Losses from dispositions of debt securities, gross | 100,000 | 10,000 | 200,000 | 10,000 |
Entergy Louisiana [Member] |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |
Amortized cost of debt securities | 131,500,000 |  | 131,500,000 |  | 120,600,000
Average coupon rate of debt securities | 3.09% |  | 3.09% |  |
Average duration of debt securities, years |  |  | 5 years 0 months 22 days |  |
Average maturity of debt securities, years |  |  | 7 years 11 months 22 days |  |
Proceeds from the dispositions of debt securities | 11,600,000 | 5,900,000 | 29,700,000 | 9,500,000 |
Gains from dispositions of debt securities, gross | 50,000 | 10,000 | 200,000 | 50,000 |
Losses from dispositions of debt securities, gross | 200 | 10,000 | 4,100 | 20,000 |
System Energy [Member] |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |
Amortized cost of debt securities | 236,800,000 |  | 236,800,000 |  | 223,400,000
Average coupon rate of debt securities | 2.16% |  | 2.16% |  |
Average duration of debt securities, years |  |  | 4 years 4 months 0 days |  |
Average maturity of debt securities, years |  |  | 5 years 11 months 5 days |  |
Proceeds from the dispositions of debt securities | 101,300,000 | 65,600,000 | 231,600,000 | 91,200,000 |
Gains from dispositions of debt securities, gross | 400,000 | 800,000 | 1,400,000 | 800,000 |
Losses from dispositions of debt securities, gross | $ 100,000 | $ 300,000 | $ 300,000 | $ 400,000 |

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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