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2.2.0.25truefalse009110 - Disclosure - Common and Preferred Stock (Details)truefalseIn Millions, except Share data, unless otherwise specifiedfalse1falsefalseUSDfalsefalse10/1/2010 - 12/31/2010 USD ($) USD ($) / shares $c00408http://www.sec.gov/CIK0000753308duration2010-10-01T00:00:002010-12-31T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli 0u001Standardhttp://www.xbrl.org/2003/instancepurexbrli0u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalse false7/1/2010 - 9/30/2010 USD ($) / shares USD ($) $c00180http://www.sec.gov/CIK0000753308duration2010-07-01T00:00:002010-09-30T00:00:00u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso4 2170USDUSD$3falsefalseUSDfalsefalse4/1/2010 - 6/30/2010 USD ($) USD ($) / shares $c00175http://www.sec.gov/CIK0000753308duration2010-04-01T00:00:002010-06-30T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli 0USDUSD$4falsefalseUSDfalsefalse1/1/2010 - 3/31/2010 USD ($) / shares USD ($) $c00177http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-03-31T00:00:00u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u001Standardhttp://www.xbrl.org/2003/instancepurexb rli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDfalsefalse10/1/2009 - 12/31/2009 USD ($) / shares USD ($) $c00409http://www.sec.gov/CIK0000753308duration2009-10-01T00:00:002009-12-31T00:00:00u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso4 2170USDUSD$6falsefalseUSDfalsefalse7/1/2009 - 9/30/2009 USD ($) / shares USD ($) $c00181http://www.sec.gov/CIK0000753308duration2009-07-01T00:00:002009-09-30T00:00:00u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso4 2170USDUSD$7falsefalseUSDfalsefalse4/1/2009 - 6/30/2009 USD ($) / shares USD ($) $c00176http://www.sec.gov/CIK0000753308duration2009-04-01T00:00:002009-06-30T00:00:00u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso4 2170USDUSD$8falsefalseUSDfalsefalse1/1/2009 - 3/31/2009 USD ($) / shares USD ($) $c00178http://www.sec.gov/CIK0000753308duration2009-01-01T00:00:002009-03-31T00:00:00u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u000Standardhttp://www.xbrl.org/2003/iso4217USDiso4 2170USDUSD$9falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $c00323http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-12-31T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0u001Standardhttp://www.xb rl.org/2003/instancepurexbrli0u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u004Standardhttp://nexteraenergyresources.com/20101231mWnee0USDUSD$10falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $c00022http://www.sec.gov/CIK0000753308duration2009-01-01T00:00:002009-12-31T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Standardhttp://www.xbrl.org/2003/instancepurexbrli0u003Dividehttp://www.xbrl. org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$11falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $c00000http://www.sec.gov/CIK0000753308duration2008-01-01T00:00:002008-12-31T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli 0u001Standardhttp://www.xbrl.org/2003/instancepurexbrli0u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0us-gaap_EarningsPerShareReconciliationAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefa lsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseReconciliation of basic and diluted earnings per share of common stock [Abstract]3false0us-gaap_NetIncomeLossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse263000000263[1],[2]falsetruefalsefalsefalse2truefalsefalse7200000007 20[1],[2]falsetruefalsefalsefalse3truefalsefalse417000000417[1],[2]falsetruefalsefalsefalse4truefalsefalse556000000556[1],[2]falsetruefalsefalsefalse5truefalsefalse349000000349[1],[2]falsetruefalsefalsefalse6truefalsefalse533000000533[1],[2]falsetruefalsefalsefalse7truefalsefalse370000000370[1],[2]falsetruefalsefalsefalse8truefalsefalse364000000364[1],[2]falsetruefalsefalsefalse9truefalsefalse19570000001957falsetruefalsefalsefalse10truefalsefalse16150000001615falsetruefalsefalsefalse11truefalsefalse16390000001639falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 10, 15 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28, 29, 30 truefalseNumerator - net income4true0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5false falsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalse false00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseDenominator [Abstract]5false0us-gaap_WeightedAverageNumberOfSharesOutstandingBasicus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefals efalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse410300000410300000falsefalsefalsefalsefalse10truefalsefalse404400000404400000falsefalsefalsefalsefalse11truefalsefalse400100000400100000falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesNumber of [basic] shares, after adjustment for contingently issuable shares and other shares not deemed outstanding, determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 falsefalseWeighted-average number of common shares outstanding - basic (in shares)6false0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse27000002700000[3]falsefalsefalsefalsefalse10truefalsefalse28000002800000[3]falsefalsefalsefalsefalse11truefalsefalse26000002600000[3]falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe sum of dilutive potential common shares used in the calculation of the diluted per-share computation.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a falsefalseOptions, performance share awards, restricted stock, equity units and warrants (in shares)7false0us-gaap_WeightedAverageNumberOfDilutedSharesOutstandingus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse< /Cell>5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse413000000413000000falsefalsefalsefalsefalse10truefalsefalse407200000407200000falsefalsefalsefalsefalse 11truefalsefalse402700000402700000falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 truefalseWeighted-average number of common shares outstanding - assuming dilution (in shares)8true0us-gaap_EarningsPerShareAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5fal sefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseEarnings per share of common stock [Abstract]9false0us-gaap_EarningsPerShareBasicus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse0.640.64[1],[4]falsetruefalsefalsefalse2truefalsefalse1.751.75[1],[4]falsetruefalsefalsefalse3truefalsefalse1.021.02[1],[4]false< ShowCurrencySymbol>truefalsefalsefalse4truefalsefalse1.361.36[1],[4]falsetruefalsefalsefalse5truefalsefalse0.860.86[1],[4]falsetruefalsefalsefalse6truefalsefalse1.321.32[1],[4]falsetruefalsefalsefalse7truefalsefalse0.920.92[1],[4]falsetruefalsefalsefalse8truefalsefalse0.900.90[1],[4]falsetruefalsefalsefalse9truefalsefalse4.774.77falsetruefalsefalsefalse10truefalsefalse3.993.99falsetruefalsefalsefalse11truefalsefalse4.104.10< NonNumericTextHeader />falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe amount of net income or loss for the period per each share of common stock outstanding during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 falsetrueBasic (in dollars per share)10false0us-gaap_EarningsPerShareDilutedus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalse< DisplayZeroAsNone>false0.630.63[1],[4]falsetruefalsefalsefalse2truefalsefalse1.741.74[1],[4]falsetruefalsefalsefalse3truefalsefalse1.011.01[1],[4]falsetruefalsefalsefalse4truefalsefalse1.361.36[1],[4]falsetruefalsefalsefalse5truefalsefalse0.850.85[1],[4]falsetruefalsefalsefalse6truefalsefalse1.311.31[1],[4]falsetruefalsefalsefalse7truefalsefalse0.910.91[1],[4]falsetruefalsefalsefalse8truefalsefalse0.900.90[1],[4]falsetruefalsefalsefalse9truefalsefalse4.744.74falsetruefalsefalsefalse10truefalsefalse3.973.97falsetruefalsefalsefalse11truefalsefalse4.074.07falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.Refer ence 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 falsetrueAssuming dilution (in dollars per share)11false0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmountus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1< IsNumeric>falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5 falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7false falsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse91000009100000falsefalsefalsefalsefalse10truefalsefalse800000800000falsefalsefalsefalsefalse11truefalsefalse500000500000falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesSecurities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 13, 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c falsefalseAntidilutive securities (in shares)12true0nee_EmployeeStockOwnershipPlanAbstractneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefals efalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseEmployee Stock Ownership Plan [Abstract]13false0us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalse falsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse3700000037falsefalsefalsefalsefalse10truefalsefalse4200000042falsefalsefalsefalsefalse11truefalsefalse4000000040falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of plan compensation cost recognized during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -Subparagraph c falsefalseESOP-related compensation expense14false0nee_EmployeeStockOwnershipPlanEsopUnearnedCompensationneefalsedebitinstantThe value of ESOP-related unearned compensation included as a reduction of common shareholders' equity, representing...falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverb oselabel1truefalsefalse6900000069falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefal sefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse6900000069falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe value of ESOP-related unearned compensation included as a reduction of common shareholders' equity, representing unallocated shares at the original issue price.No authoritative reference available.falsefalseESOP-related unearned compensation at original issue price15false0us-gaap_EmployeeStockOwnershipPlanESOPDeferredSharesFairValueus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse248000000248falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefals efalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse248000000248falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe fair value of shares held by the ESOP as of the balance-sheet date in which no ESOP participant has a vested interest and no lender has a claim. The fair value of an ESOP share is the amount the seller could reasonably expect to receive for it in a current sale between a willing buyer and a willing seller, that is, other than in a forced or liquidation sale, which would be the market price of t he stock if it is publicly traded.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -Subparagraph e falsefalseESOP-related unearned compensation at closing price as of end of period16true0us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse< Cell>11falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseStock-based compensation [Abstract]17false0us-gaap_AllocatedShareBasedCompensationExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse5700000057falsefalsefalsefalsefalse10truefalsefalse5100000051falsefalsefalsefalsefalse11truefalsefalse4700000047falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryRepresents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) 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efalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse2200000022falsefalsefalsefalsefalse10truefalsefalse2000000020falsefalsefalsefalsefalse11tru efalsefalse1800000018falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe total recognized tax benefit related to compensation cost for share-based payment arrangements recognized in income during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) falsefalseTax benefits related to stock-based compensation arrangements19false0us-gaap_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse6300000063falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefals e3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse6300000063falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAs of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met).Reference 1: http://www.xbrl. org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R 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falsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalse falsefalse9truetruefalse0.20740.2074[5]falsefalsefalsefalsefalse10truetruefalse0.19020.1902[5]falsefals efalsefalsefalse11falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe low range of the estimated measure of the percentage amount by which a share price is expected to fluctuate during a period.No authoritative reference available.falsefalseExpected volatility, low range (in hundredths)107false0nee_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateHighRangeneefalsenadurationThe high range of the estimated measure of the percentage amount by which a share price is expected to fluctuate during 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalse false7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsetruefalse00falsefalsefalsefalsefalse10falsetruefalse00falsefalsefalsefalsefalse11truetruefalse0.02750.0275falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) falsefalseExpected dividends (in 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estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.No authoritative reference available.falsefalseExpected dividends, high range (in hundredths)111false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse66[6]falsefalsefalsefalsefalse10truefalsefalse66[6]falsefalsefalsefalsefalse11truefalsefalse66[7]falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThe period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vest ing employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 falsefalseExpected term (years)112false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel 1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3 falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5 falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsetruefalse00falsefalsefalsefalsefalse10falsetruefalse00falsefalsefalsefalsefalse11true truefalse0.03240.0324falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe risk-free interest rate assumption that is used in valuing an option on its own shares.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) falsefalseRisk-free rate (in hundredths)113false0nee_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateLowRangeneefalsenadurationThe low range of the risk-free interest rate assumption that is used in valuing an option on its own shares.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse verboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truetruefalse0.01650.0165falsefalsefalsefalsefalse10truetruefalse0.02680.0268falsefalsefalsefalsefalse11falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe low range of the risk-free interest rate assumption that is used in valuing an option on its own shares.No authoritative reference available.falsefalseRisk-free rate, low range (in hundredths)114false0nee_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateHighRangeneefalsenadurationThe high range of the risk-free interest rate assumption that is used in valuing an option on its own shares.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefal se7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truetruefalse0.02910.0291falsefalsefalsefalsefalse10truetruefalse0.02970.0297falsefalsefalsefalsefalse11falsetruefalse00falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe high range of the risk-free interest rate assumption that is used in valuing an option on its own shares.No authoritative reference available.falsefalseRisk-free rate, high range (in hundredths)< /Label>115true0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForwardus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9falsefalsefalse00falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse0 0falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringA roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.falsefalseOption activity [Roll Forward]116false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumberus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse57392635739263falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) Reference 2: 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available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse< Cell>5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse 7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9 truefalsefalse-2400-2400falsefalsefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(g) falsefalseShares underlying options - Expired (in shares)121false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumberus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse50366525036652falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5truefalsefalse57392635739263falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse50366525036652falsefalsefalsefalsefalse10truefalsefalse57392635739263falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested 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available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5falsefalsefalse00falsefalsefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalsefalse9truefalsefalse35.6535.65falsetruefalsefalsefalse10falsefalsefalse00falsefalsefalsefalsefalse11falsefalsefalse00falsefalsefalsefalsefalseEPSus-types:perShareItemTypedecimalThe weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) falsetrueBalance at beginning of year, weighted average exercise price (in 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weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(g) falsetrueExpired, weighted average exercise price (in dollars per share)129false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabe l1truefalsefalse38.6938.69falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalse5truefalsefalse35.6535.65falsetruefalsefalsefalse6falsefalsefalse00falsefalsefalsefalsefalse7falsefalsefalse00falsefalsefalsefalsefalse8falsefalsefalse00falsefalsefalsefalse< 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