Variable Interest Entities	12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities NEP has identified NEP OpCo, a limited partnership with a general partner and limited partners, as a VIE. NEP has consolidated the results of NEP OpCo and its subsidiaries because of its controlling interest in the general partner of NEP OpCo. At December 31, 2018, NEP owned an approximately 35.6% limited partner interest in NEP OpCo and NEE Equity owned a noncontrolling 64.4% limited partner interest in NEP OpCo. The assets and liabilities of NEP OpCo as well as the operations of NEP OpCo represent substantially all of NEP's assets and liabilities and its operations. In addition, at December 31, 2018, NEP OpCo consolidated 12 VIEs related to certain subsidiaries which have sold differential membership interests (see Note 2 - Differential Membership Interests) in entities which own and operate 20 wind electric generation facilities. These entities are considered VIEs because the holders of the differential membership interests do not have substantive rights over the significant activities of these entities. The assets, primarily property, plant and equipment - net, and liabilities, primarily asset retirement obligation and non-current due to related party, of the VIEs, totaled approximately $4,937 million and $132 million, respectively at December 31, 2018. The assets, primarily property, plant and equipment - net, and liabilities, primarily deferral related to differential membership interests, totaled approximately $2,840 million and $1,515 million at December 31, 2017, respectively. At December 31, 2018, NEP OpCo also consolidated a VIE related to the sale of a noncontrolling Class B interest in NEP Renewables. See Note 3 and Note 11 - Equity. This entity is considered a VIE because the holder of the noncontrolling Class B interest does not have substantive rights over the significant activities of the entity. The assets, primarily property, plant and equipment - net and liabilities, primarily long-term debt and asset retirement obligation, of the VIE totaled approximately $2,339 million and $89 million, respectively, at December 31, 2018. NEP has an indirect equity method investment in three NEER solar projects with a total generating capacity of 277 MW. Through a series of transactions, a subsidiary of NEP issued 1,000,000 NEP OpCo Class B Units, Series 1 and 1,000,000 NEP OpCo Class B Units, Series 2, to NEER for approximately 50% of the ownership interests in the three solar projects (non-economic ownership interests). NEER, as holder of the NEP OpCo Class B Units, will retain 100% of the economic rights in the projects to which the respective Class B Units relate, including the right to all distributions paid by the project subsidiaries that own the projects to NEP OpCo. NEER has agreed to indemnify NEP against all risks relating to NEP’s ownership of the projects and construction of the projects until NEER offers to sell economic interests to NEP and NEP accepts such offer, if NEP chooses to do so. NEER has also agreed to continue to manage the operation of the projects at its own cost, and to contribute to the projects any capital necessary for the operation of the projects, until NEER offers to sell economic interests to NEP and NEP accepts such offer. At December 31, 2018 and 2017, the non-economic ownership interests are reflected as investments in non-economic ownership interests on the consolidated balance sheets and are attributable to noncontrolling interests. All equity in earnings of the non-economic ownership interests is allocated to net income attributable to noncontrolling interests. NEP is not the primary beneficiary and therefore does not consolidate these entities because it does not control any of the ongoing activities of these entities, was not involved in the initial design of these entities and does not have a controlling interest in these entities.

Variable Interest Entities

NEP has identified NEP OpCo, a limited partnership with a general partner and limited partners, as a VIE. NEP has consolidated the results of NEP OpCo and its subsidiaries because of its controlling interest in the general partner of NEP OpCo. At December 31, 2018, NEP owned an approximately 35.6% limited partner interest in NEP OpCo and NEE Equity owned a noncontrolling 64.4% limited partner interest in NEP OpCo. The assets and liabilities of NEP OpCo as well as the operations of NEP OpCo represent substantially all of NEP's assets and liabilities and its operations.

In addition, at December 31, 2018, NEP OpCo consolidated 12 VIEs related to certain subsidiaries which have sold differential membership interests (see Note 2 - Differential Membership Interests) in entities which own and operate 20 wind electric generation facilities. These entities are considered VIEs because the holders of the differential membership interests do not have substantive rights over the significant activities of these entities. The assets, primarily property, plant and equipment - net, and liabilities, primarily asset retirement obligation and non-current due to related party, of the VIEs, totaled approximately $4,937 million and $132 million, respectively at December 31, 2018. The assets, primarily property, plant and equipment - net, and liabilities, primarily deferral related to differential membership interests, totaled approximately $2,840 million and $1,515 million at December 31, 2017, respectively.

At December 31, 2018, NEP OpCo also consolidated a VIE related to the sale of a noncontrolling Class B interest in NEP Renewables. See Note 3 and Note 11 - Equity. This entity is considered a VIE because the holder of the noncontrolling Class B interest does not have substantive rights over the significant activities of the entity. The assets, primarily property, plant and equipment - net and liabilities, primarily long-term debt and asset retirement obligation, of the VIE totaled approximately $2,339 million and $89 million, respectively, at December 31, 2018.

NEP has an indirect equity method investment in three NEER solar projects with a total generating capacity of 277 MW. Through a series of transactions, a subsidiary of NEP issued 1,000,000 NEP OpCo Class B Units, Series 1 and 1,000,000 NEP OpCo Class B Units, Series 2, to NEER for approximately 50% of the ownership interests in the three solar projects (non-economic ownership interests). NEER, as holder of the NEP OpCo Class B Units, will retain 100% of the economic rights in the projects to which the respective Class B Units relate, including the right to all distributions paid by the project subsidiaries that own the projects to NEP OpCo. NEER has agreed to indemnify NEP against all risks relating to NEP’s ownership of the projects and construction of the projects until NEER offers to sell economic interests to NEP and NEP accepts such offer, if NEP chooses to do so. NEER has also agreed to continue to manage the operation of the projects at its own cost, and to contribute to the projects any capital necessary for the operation of the projects, until NEER offers to sell economic interests to NEP and NEP accepts such offer. At December 31, 2018 and 2017, the non-economic ownership interests are reflected as investments in non-economic ownership interests on the consolidated balance sheets and are attributable to noncontrolling interests. All equity in earnings of the non-economic ownership interests is allocated to net income attributable to noncontrolling interests. NEP is not the primary beneficiary and therefore does not consolidate these entities because it does not control any of the ongoing activities of these entities, was not involved in the initial design of these entities and does not have a controlling interest in these entities.