Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes NEE's effective income tax rates for the three months ended March 31, 2018 and 2017 were approximately 25% and 30%, respectively. The rates for both periods reflect the benefit of PTCs of approximately $23 million and $28 million, respectively, related to NEER's wind projects, as well as ITCs and deferred income taxes associated with grants under the Recovery Act (convertible ITCs) totaling approximately $36 million and $128 million, respectively, related to solar and certain wind projects at NEER. During the three months ended March 31, 2018, NEE recorded an income tax charge of approximately $125 million related to an adjustment to differential membership interests primarily as a result of the change in federal income tax rates effective January 1, 2018 (see Note 10 - Accounting for Partial Sales of Nonfinancial Assets). NEE recognizes PTCs as wind energy is generated and sold based on a per kWh rate prescribed in applicable federal and state statutes, which may differ significantly from amounts computed, on a quarterly basis, using an overall effective income tax rate anticipated for the full year. NEE uses this method of recognizing PTCs for specific reasons, including that PTCs are an integral part of the financial viability of most wind projects and a fundamental component of such wind projects' results of operations. PTCs, as well as ITCs and deferred income taxes associated with convertible ITCs, can significantly affect NEE's effective income tax rate depending on the amount of pretax income. The amount of PTCs recognized can be significantly affected by wind generation and by the roll off of PTCs after ten years of production. On December 22, 2017, tax reform legislation was signed into law which, among other things, reduced the federal corporate income tax rate from 35% to 21% effective January 1, 2018. As a result, NEE, including FPL, performed an analysis to preliminarily revalue its deferred income taxes and included an estimate of changes in the balances in NEE's and FPL's December 31, 2017 financial statements. At December 31, 2017, the revaluation reduced NEE’s net deferred income tax liabilities by approximately $6.5 billion, of which $4.5 billion related to net deferred income tax liabilities at FPL and the remaining $2 billion related to net deferred income tax liabilities at NEER. The $2 billion reduction in NEER’s deferred income tax liabilities increased NEER’s 2017 net income. The $4.5 billion reduction in FPL’s deferred income tax liabilities was recorded as a regulatory liability. While NEE and FPL continue to believe that the provisional tax reform adjustments are reasonable estimates of the effects on its existing deferred taxes, additional analysis and detailed reviews are still being performed to finalize the accounting for the remeasurement of deferred tax assets and liabilities as a result of the enactment of tax reform. Effective January 1, 2018, NEE early adopted an accounting standards update that provided entities the option to reclassify certain tax effects from AOCI to retained earnings as a result of tax reform. Upon adoption, NEE reclassified approximately $16 million of tax benefits from AOCI to retained earnings.

Income Taxes

NEE's effective income tax rates for the three months ended March 31, 2018 and 2017 were approximately 25% and 30%, respectively. The rates for both periods reflect the benefit of PTCs of approximately $23 million and $28 million, respectively, related to NEER's wind projects, as well as ITCs and deferred income taxes associated with grants under the Recovery Act (convertible ITCs) totaling approximately $36 million and $128 million, respectively, related to solar and certain wind projects at NEER. During the three months ended March 31, 2018, NEE recorded an income tax charge of approximately $125 million related to an adjustment to differential membership interests primarily as a result of the change in federal income tax rates effective January 1, 2018 (see Note 10 - Accounting for Partial Sales of Nonfinancial Assets).

NEE recognizes PTCs as wind energy is generated and sold based on a per kWh rate prescribed in applicable federal and state statutes, which may differ significantly from amounts computed, on a quarterly basis, using an overall effective income tax rate anticipated for the full year. NEE uses this method of recognizing PTCs for specific reasons, including that PTCs are an integral part of the financial viability of most wind projects and a fundamental component of such wind projects' results of operations. PTCs, as well as ITCs and deferred income taxes associated with convertible ITCs, can significantly affect NEE's effective income tax rate depending on the amount of pretax income. The amount of PTCs recognized can be significantly affected by wind generation and by the roll off of PTCs after ten years of production.

On December 22, 2017, tax reform legislation was signed into law which, among other things, reduced the federal corporate income tax rate from 35% to 21% effective January 1, 2018. As a result, NEE, including FPL, performed an analysis to preliminarily revalue its deferred income taxes and included an estimate of changes in the balances in NEE's and FPL's December 31, 2017 financial statements. At December 31, 2017, the revaluation reduced NEE’s net deferred income tax liabilities by approximately $6.5 billion, of which $4.5 billion related to net deferred income tax liabilities at FPL and the remaining $2 billion related to net deferred income tax liabilities at NEER. The $2 billion reduction in NEER’s deferred income tax liabilities increased NEER’s 2017 net income. The $4.5 billion reduction in FPL’s deferred income tax liabilities was recorded as a regulatory liability. While NEE and FPL continue to believe that the provisional tax reform adjustments are reasonable estimates of the effects on its existing deferred taxes, additional analysis and detailed reviews are still being performed to finalize the accounting for the remeasurement of deferred tax assets and liabilities as a result of the enactment of tax reform. Effective January 1, 2018, NEE early adopted an accounting standards update that provided entities the option to reclassify certain tax effects from AOCI to retained earnings as a result of tax reform. Upon adoption, NEE reclassified approximately $16 million of tax benefits from AOCI to retained earnings.