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Equity (Accumulated Other Comprehensive Income (Loss))(Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax |  |  |  | $ (632,617) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  | $ (561,498) | $ 10,960 |  | $ (23,531) | $ (34,971)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 72,404 | 72,480 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 6,741 | (26,549) |  |  |
Other comprehensive income (loss) |  | 79,145 | 45,931 |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | [1] | (16,538) |  |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects |  | 15,505 |  |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | (656,148) |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | 748 |  |  | 748
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | 0 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 0 |  |  |
Other comprehensive income (loss) |  |  | 0 |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax |  |  |  | (632,617) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  | (6,201) | 467,561 |  | 545,045 | 429,734
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 838 | 39,872 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (33,694) | (2,045) |  |  |
Other comprehensive income (loss) |  | (32,856) | 37,827 |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects |  | 114,227 |  |  |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Restatement Adjustment [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | (87,572) |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax |  |  |  | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  | (605,491) | (460,814) |  | (531,099) | (469,446)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | 0 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 16,574 | 8,632 |  |  |
Other comprehensive income (loss) |  | 16,574 | 8,632 |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects |  | (90,966) |  |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Restatement Adjustment [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | (531,099) |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax |  |  |  | 0 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  | 50,194 | 3,465 |  | (37,477) | 3,993
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 71,566 | 32,608 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 23,861 | (33,136) |  |  |
Other comprehensive income (loss) |  | 95,427 | (528) |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects |  | (7,756) |  |  |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Restatement Adjustment [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | $ (37,477) |  |
Entergy Louisiana [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  | (56,950) |  |  | (46,400) |
Other comprehensive income (loss) |  | (501) | (370) |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  | (3,787) |  |  |  |
Entergy Louisiana [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss |  | (56,950) | (48,812) |  | $ (46,400) | $ (48,442)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (501) | (370) |  |  |
Other comprehensive income (loss) |  | (501) | (370) |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  | $ (10,049) | $ 0 |  |  |
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- Definition Amount, after tax, of accumulated gain (loss) from increase (decrease) in instrument-specific credit risk of financial liability measured under fair value option. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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