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Risk Management and Fair Values (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |
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Mar. 31, 2014 MWh MMBTU | Mar. 31, 2013 | Mar. 31, 2014 Entergy Arkansas [Member] MWh | Mar. 31, 2014 Entergy Gulf States Louisiana [Member] MWh MMBTU | Mar. 31, 2014 Entergy Louisiana [Member] MWh MMBTU | Mar. 31, 2014 Entergy Mississippi [Member] MWh MMBTU | Mar. 31, 2014 Entergy New Orleans [Member] MWh | Mar. 31, 2014 Entergy Texas [Member] MWh | Mar. 31, 2014 Fixed Transmission Rights (FTRs) [Member] Entergy Arkansas [Member] | Mar. 31, 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] | Mar. 31, 2014 Utility and Entergy Wholesale Commodities [Member] Fixed Transmission Rights (FTRs) [Member] | Mar. 31, 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 |  |  |  |  |  |  |  |  | 1 | 65 | 47 | 1 | 64
Cash flow hedges relating to power sales as part of net unrealized gains | 98 |  |  |  |  |  |  |  |  |  |  |  |
Reclassified from accumulated other comprehensive income (OCI) to operating revenues | 74 |  |  |  |  |  |  |  |  |  |  |  |
Maturity of cash flow hedges, before taxes | (195) | (2) |  |  |  |  |  |  |  |  |  |  |
Maturity of cash flow hedges, Tax | (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 9 months |  |  |  |  |  |  |  |  |  |  |  |
Planned generation sold forward from non utility nuclear power plants for the remainder of the period | 75.00% |  |  |  |  |  |  |  |  |  |  |  |
Planned Generation Sold Forward under financial derivatives | 45.00% |  |  |  |  |  |  |  |  |  |  |  |
Total planned generation for remainder of the period (MMBtu) | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total volume of natural gas swaps outstanding (MMBtu) | 42,490,000 |  |  | 16,070,000 | 19,180,000 | 7,240,000 |  |  |  |  |  |  |
Total volume of fixed transmission rights outstanding (MMBtu) | 15,554,000 |  | 3,540,000 | 2,613,000 | 3,998,000 | 2,319,000 | 523,000 | 2,423,000 |  |  |  |  |
Change in cash flow hedges due to ineffectiveness | 1.0 | (1.3) |  |  |  |  |  |  |  |  |  |  |
Dollar amount of hedge contract in a liability position | $ 98 | $ 25 |  |  |  |  |  |  |  |  |  |  |

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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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