Summary of Significant Accounting and Reporting Policies	9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting and Reporting Policies	Summary of Significant Accounting and Reporting Policies Revenue and Rates - In May 2018, the Florida Supreme Court affirmed the FPSC’s final order approving the 2016 rate agreement, which had been appealed by the Sierra Club. Goodwill and Other Intangible Assets - Effective January 1, 2018, NEE and FPL adopted an accounting standards update that clarified the definition of a business. The revised guidance affects the evaluation of whether a transaction should be accounted for as an acquisition or disposition of an asset or a business. NEE and FPL adopted this guidance on a prospective basis effective January 1, 2018. Restricted Cash - In the fourth quarter of 2017, NEE and FPL early adopted an accounting standards update which requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the consolidated statements of cash flows. NEE and FPL adopted the standards update retrospectively, which adoption did not have a material impact on NEE’s or FPL’s consolidated statements of cash flows. At September 30, 2018 and December 31, 2017, NEE had approximately $224 million ($102 million for FPL) and $269 million ($141 million for FPL), respectively, of restricted cash, of which approximately $198 million ($76 million for FPL) and $247 million ($128 million for FPL), respectively, is included in current other assets and the remaining balance is included in noncurrent other assets on NEE's and FPL's condensed consolidated balance sheets. Restricted cash is primarily related to debt service payments, bond proceeds held for construction at FPL and margin cash collateral requirements. In addition, where offsetting positions exist, restricted cash related to margin cash collateral is netted against derivative instruments, which totaled $70 million at September 30, 2018. See Note 4. Leases - In February 2016, the FASB issued an accounting standards update which requires, among other things, that lessees recognize a lease liability, initially measured at the present value of the future lease payments, and a right-of-use asset for all leases (with the exception of short-term leases) (new lease standard). The new lease standard also requires new qualitative and quantitative disclosures for both lessees and lessors. The new lease standard will be effective for NEE and FPL beginning January 1, 2019. Early adoption is permitted. The new lease standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as an adjustment to retained earnings as of the date of initial application. NEE and FPL are currently reviewing their portfolio of contracts and evaluating the proper application of the new lease standard to these contracts in order to determine the impact the adoption will have on their consolidated financial statements, including timing of adoption. NEE and FPL are implementing a number of system enhancements to facilitate the identification, tracking and reporting of leases based upon the requirements of the new lease standard. NEE and FPL are continuing to assess the transition options and practical expedients and monitoring industry implementation issues. Accounting for Partial Sales of Nonfinancial Assets - Effective January 1, 2018, NEE and FPL adopted an accounting standards update regarding the accounting for partial sales of nonfinancial assets using the modified retrospective approach, resulting in cumulative effects being recognized on January 1, 2018. This standards update affects the accounting and related financial statement presentation for the sales of differential membership interests to third-party investors and the sales of NEER assets to indirect subsidiaries of NEP. The adoption of this standards update did not have an impact on FPL. For the sales of differential membership interests to third-party investors, NEE recorded an increase to retained earnings of approximately $34 million ($56 million pretax) and a reduction to additional paid-in capital of $77 million ($59 million after tax) on January 1, 2018. In addition, the liability reflected as deferral related to differential membership interests - VIEs on NEE's consolidated balance sheets at December 31, 2017 was reclassified to noncontrolling interests. Beginning in 2018, as the third-party investors receive their portion of the economic attributes of the related facilities, NEE records such amounts as net loss attributable to noncontrolling interests. Prior to the adoption of this standards update, the income related to differential membership interests was recognized in benefits associated with differential membership interests - net in NEE's condensed consolidated statements of income. Additionally, net (income) loss attributable to noncontrolling interests for the nine months ended September 30, 2018 includes approximately $497 million ($373 million after tax) related to a reduction of differential membership interests as a result of the change in federal income tax rates effective January 1, 2018. Also upon adoption of the standards update, the profit sharing liability associated with the sales of NEER assets to NEP was eliminated and NEE recorded an increase to additional paid-in capital of approximately $842 million ($652 million after tax) and a reduction to retained earnings of approximately $52 million ($69 million pretax) on January 1, 2018. Due to the deconsolidation of NEP, the previous accounting guidance would not have had an impact on NEE's 2018 financial statements, but rather the profit sharing liability would have increased the gain on NEP deconsolidation. Assets and Liabilities Associated with Assets Held for Sale - In August 2018, subsidiaries of NEER entered into an agreement with a subsidiary of NEP to sell ownership interests in ten wind generation facilities and one solar generation facility located in the Midwest, South and West regions of the U.S. with a total generating capacity of 1,388 MW at September 30, 2018, for a cash purchase price of approximately $1.3 billion, subject to certain adjustments, and NEP's assumption of approximately $930 million in existing noncontrolling interests related to differential membership investors. A NEER affiliate will continue to operate the facilities included in the sale under an existing service agreement. The transaction is expected to close in the fourth quarter of 2018, pending the receipt of necessary regulatory approvals and satisfaction of other customary closing conditions. The carrying amounts of the major classes of assets related to the facilities that were classified as held for sale on NEE's condensed consolidated balance sheets at September 30, 2018 primarily represent property, plant and equipment. Liabilities associated with assets held for sale, which is included in current other liabilities on NEE's condensed consolidated balance sheets, was approximately $80 million at September 30, 2018 and primarily represent long-term debt. In January 2017, an indirect wholly owned subsidiary of NEE completed the sale of its membership interests in its fiber-optic telecommunications business for net cash proceeds of approximately $1.1 billion, after repayment of $370 million of related long-term debt. In connection with the sale and the related consolidating state income tax effects, a gain of approximately $1.1 billion (approximately $685 million after tax) was recorded in NEE's condensed consolidated statements of income during the nine months ended September 30, 2017 and is included in losses (gains) on disposal of a business/assets - net.

Summary of Significant Accounting and Reporting Policies

Revenue and Rates - In May 2018, the Florida Supreme Court affirmed the FPSC’s final order approving the 2016 rate agreement, which had been appealed by the Sierra Club.

Goodwill and Other Intangible Assets - Effective January 1, 2018, NEE and FPL adopted an accounting standards update that clarified the definition of a business. The revised guidance affects the evaluation of whether a transaction should be accounted for as an acquisition or disposition of an asset or a business. NEE and FPL adopted this guidance on a prospective basis effective January 1, 2018.

Restricted Cash - In the fourth quarter of 2017, NEE and FPL early adopted an accounting standards update which requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the consolidated statements of cash flows. NEE and FPL adopted the standards update retrospectively, which adoption did not have a material impact on NEE’s or FPL’s consolidated statements of cash flows.

At September 30, 2018 and December 31, 2017, NEE had approximately $224 million ($102 million for FPL) and $269 million ($141 million for FPL), respectively, of restricted cash, of which approximately $198 million ($76 million for FPL) and $247 million ($128 million for FPL), respectively, is included in current other assets and the remaining balance is included in noncurrent other assets on NEE's and FPL's condensed consolidated balance sheets. Restricted cash is primarily related to debt service payments, bond proceeds held for construction at FPL and margin cash collateral requirements. In addition, where offsetting positions exist, restricted cash related to margin cash collateral is netted against derivative instruments, which totaled $70 million at September 30, 2018. See Note 4.

Leases - In February 2016, the FASB issued an accounting standards update which requires, among other things, that lessees recognize a lease liability, initially measured at the present value of the future lease payments, and a right-of-use asset for all leases (with the exception of short-term leases) (new lease standard). The new lease standard also requires new qualitative and quantitative disclosures for both lessees and lessors. The new lease standard will be effective for NEE and FPL beginning January 1, 2019. Early adoption is permitted. The new lease standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as an adjustment to retained earnings as of the date of initial application.

NEE and FPL are currently reviewing their portfolio of contracts and evaluating the proper application of the new lease standard to these contracts in order to determine the impact the adoption will have on their consolidated financial statements, including timing of adoption. NEE and FPL are implementing a number of system enhancements to facilitate the identification, tracking and reporting of leases based upon the requirements of the new lease standard. NEE and FPL are continuing to assess the transition options and practical expedients and monitoring industry implementation issues.

Accounting for Partial Sales of Nonfinancial Assets - Effective January 1, 2018, NEE and FPL adopted an accounting standards update regarding the accounting for partial sales of nonfinancial assets using the modified retrospective approach, resulting in cumulative effects being recognized on January 1, 2018. This standards update affects the accounting and related financial statement presentation for the sales of differential membership interests to third-party investors and the sales of NEER assets to indirect subsidiaries of NEP. The adoption of this standards update did not have an impact on FPL.

For the sales of differential membership interests to third-party investors, NEE recorded an increase to retained earnings of approximately $34 million ($56 million pretax) and a reduction to additional paid-in capital of $77 million ($59 million after tax) on January 1, 2018. In addition, the liability reflected as deferral related to differential membership interests - VIEs on NEE's consolidated balance sheets at December 31, 2017 was reclassified to noncontrolling interests. Beginning in 2018, as the third-party investors receive their portion of the economic attributes of the related facilities, NEE records such amounts as net loss attributable to noncontrolling interests. Prior to the adoption of this standards update, the income related to differential membership interests was recognized in benefits associated with differential membership interests - net in NEE's condensed consolidated statements of income. Additionally, net (income) loss attributable to noncontrolling interests for the nine months ended September 30, 2018 includes approximately $497 million ($373 million after tax) related to a reduction of differential membership interests as a result of the change in federal income tax rates effective January 1, 2018.

Also upon adoption of the standards update, the profit sharing liability associated with the sales of NEER assets to NEP was eliminated and NEE recorded an increase to additional paid-in capital of approximately $842 million ($652 million after tax) and a reduction to retained earnings of approximately $52 million ($69 million pretax) on January 1, 2018. Due to the deconsolidation of NEP, the previous accounting guidance would not have had an impact on NEE's 2018 financial statements, but rather the profit sharing liability would have increased the gain on NEP deconsolidation.

Assets and Liabilities Associated with Assets Held for Sale - In August 2018, subsidiaries of NEER entered into an agreement with a subsidiary of NEP to sell ownership interests in ten wind generation facilities and one solar generation facility located in the Midwest, South and West regions of the U.S. with a total generating capacity of 1,388 MW at September 30, 2018, for a cash purchase price of approximately $1.3 billion, subject to certain adjustments, and NEP's assumption of approximately $930 million in existing noncontrolling interests related to differential membership investors. A NEER affiliate will continue to operate the facilities included in the sale under an existing service agreement. The transaction is expected to close in the fourth quarter of 2018, pending the receipt of necessary regulatory approvals and satisfaction of other customary closing conditions. The carrying amounts of the major classes of assets related to the facilities that were classified as held for sale on NEE's condensed consolidated balance sheets at September 30, 2018 primarily represent property, plant and equipment. Liabilities associated with assets held for sale, which is included in current other liabilities on NEE's condensed consolidated balance sheets, was approximately $80 million at September 30, 2018 and primarily represent long-term debt.

In January 2017, an indirect wholly owned subsidiary of NEE completed the sale of its membership interests in its fiber-optic telecommunications business for net cash proceeds of approximately $1.1 billion, after repayment of $370 million of related long-term debt. In connection with the sale and the related consolidating state income tax effects, a gain of approximately $1.1 billion (approximately $685 million after tax) was recorded in NEE's condensed consolidated statements of income during the nine months ended September 30, 2017 and is included in losses (gains) on disposal of a business/assets - net.