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Risk Management and Fair Values (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |
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Jun. 30, 2014 MMBTU MWh | Jun. 30, 2013 | Jun. 30, 2014 counterparty MWh MMBTU | Jun. 30, 2013 counterparty | Jun. 30, 2014 Entergy Arkansas [Member] MWh | Jun. 30, 2014 Entergy Gulf States Louisiana [Member] MWh MMBTU | Jun. 30, 2014 Entergy Louisiana [Member] MMBTU MWh | Jun. 30, 2014 Entergy Mississippi [Member] MMBTU MWh | Jun. 30, 2014 Entergy New Orleans [Member] MWh MMBTU | Jun. 30, 2014 Entergy Texas [Member] MWh | Jun. 30, 2014 Utility and Entergy Wholesale Commodities [Member] Electricity Swaps And Options And Fixed Transmission Rights [Member] | Dec. 31, 2013 Utility and Entergy Wholesale Commodities [Member] Electricity Swaps And Options And Fixed Transmission Rights [Member] | Jun. 30, 2014 Entergy Wholesale Commodities [Member] Electricity Swaps And Options [Member]
Risk Management and Fair Values [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Collateral for Borrowed Securities |  |  |  |  |  |  |  |  |  |  |  | $ 4 |
Cash collateral posted |  |  |  |  |  |  |  |  |  |  | 0 | 47 | 13
Cash flow hedges relating to power sales as part of net unrealized gains |  |  | (108) |  |  |  |  |  |  |  |  |  |
Reclassified from accumulated other comprehensive income (OCI) to operating revenues |  |  | (76) |  |  |  |  |  |  |  |  |  |
Number of Derivative Contract Counterparties in a Liability Position |  |  | 10 | 4 |  |  |  |  |  |  |  |  |
Maturity of cash flow hedges, before taxes |  | 4 | (195) | 2 |  |  |  |  |  |  |  |  |
Maturity of cash flow hedges, Tax |  | 2 | (68) | 1 |  |  |  |  |  |  |  |  |
Maximum length of time over which Company is currently hedging the variability in future cash flows for forecasted power transactions, years |  |  | 2 years 6 months |  |  |  |  |  |  |  |  |  |
Planned generation sold forward from non utility nuclear power plants for the remainder of the period |  |  | 77.00% |  |  |  |  |  |  |  |  |  |
Planned Generation Sold Forward under financial derivatives | 60.00% |  | 60.00% |  |  |  |  |  |  |  |  |  |
Total planned generation for remainder of the period (MMBtu) |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |
Total volume of natural gas swaps outstanding (MMBtu) | 24,853,000 |  | 24,853,000 |  |  | 10,200,000 | 10,150,000 | 4,190,000 | 313,000 |  |  |  |
Total volume of fixed transmission rights outstanding (MMBtu) | 105,297,000 |  | 105,297,000 |  | 22,736,000 | 22,966,000 | 25,061,000 | 13,053,000 | 8,078,000 | 13,264,000 |  |  |
Change in cash flow hedges due to ineffectiveness | 0.8 | 0.8 | 1.8 | (0.5) |  |  |  |  |  |  |  |  |
Dollar amount of hedge contract in a liability position | $ 93 | $ 10 | $ 93 | $ 10 |  |  |  |  |  |  |  |  |

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- Definition Maximum length of time over which Company is currently hedging the variability in future cash flows with derivatives for forecasted power transactions. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),2) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 7 + Details
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