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Summary of Significant Accounting and Reporting Policies | 9 Months Ended
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Sep. 30, 2019
Accounting Policies [Abstract] |
Summary of Significant Accounting and Reporting Policies | Summary of Significant Accounting and Reporting Policies Restricted Cash - A t September 30, 2019 and December 31, 2018, NEP had approximately $4 million and $8 million, respectively, of restricted cash included in other current assets and $11 million and $11 million, respectively, of restricted cash included in other non-current assets on NEP's condensed consolidated balance sheets. Restricted cash is primarily related to amounts held by certain subsidiaries to pay for certain capital or operating expenditures, as well as to fund required equity contributions pursuant to restrictions contained in the subsidiaries' debt agreements. Restricted cash reported as current assets are recorded as such based on the anticipated use of these funds. Disposal of Canadian Holdings - In June 2018, a subsidiary of NEP completed the sale of Canadian Holdings for cash proceeds of approximately CAD $740 million (USD $563 million at June 29, 2018), subject to post-closing working capital adjustments of approximately $1 million. In addition, the purchaser assumed approximately $676 million of existing debt. Canadian Holdings owned four wind generation facilities and two solar generation facilities located in Ontario, Canada with a generating capacity totaling approximately 396 MW. NEP recognized a gain of approximately $153 million ($201 million after tax) which is reflected as gain on disposal of Canadian Holdings in NEP's condensed consolidated statements of income. Income before income taxes associated with Canadian Holdings was approximately $47 million for the nine months ended September 30, 2018. Noncontrolling Interests - At September 30, 2019, NEE's approximately 62.5% noncontrolling limited partner interest in NEP OpCo, a non-affiliated party's 10% interest in one of the Texas pipelines, NEER's approximately 50% noncontrolling ownership interest in Silver State, the interests related to differential membership interests and the Class B noncontrolling ownership interests (the Class B noncontrolling interests in NEP Renewables sold in 2018 and NEP Renewables II sold in 2019) are reflected as noncontrolling interests on the condensed consolidated balance sheets. The impact of the net income (loss) attributable to the Class B noncontrolling interests and the differential membership interests are allocated to NEE's noncontrolling ownership interest and the net income attributable to NEP based on their respective ownership percentage of NEP OpCo. Details of the activity in noncontrolling interests are below:
|  | Class B Noncontrolling Ownership Interests |  | Differential Membership Interests |  | Noncontrolling Ownership Interests in NEP OpCo, Silver State and Texas pipeline |  | Total Noncontrolling Interests
Nine months ended September 30, 2019 |  | (millions)
Balances, December 31, 2018 |  | $ | 751 |  |  | $ | 2,019 |  |  | $ | 422 |  |  | $ | 3,192 |
Net income (loss) attributable to NCI |  | 12 |  |  | (60 | ) |  | (57 | ) |  | (105 | )
Other comprehensive loss |  | — |  |  | — |  |  | (3 | ) |  | (3 | )
Related party contributions |  | — |  |  | — |  |  | 1 |  |  | 1 |
Related party distributions |  | — |  |  | — |  |  | (51 | ) |  | (51 | )
Changes in non-economic ownership interests |  | — |  |  | — |  |  | (6 | ) |  | (6 | )
Differential membership interests contributions, net of distributions |  | — |  |  | 24 |  |  | — |  |  | 24 |
Payments to Class B noncontrolling interest investors |  | (5 | ) |  | — |  |  | — |  |  | (5 | )
Other |  | — |  |  | — |  |  | 1 |  |  | 1 |
Balances, March 31, 2019 |  | 758 |  |  | 1,983 |  |  | 307 |  | — |  | 3,048 |
Sale of Class B noncontrolling interest - net |  | 893 |  |  | — |  |  | — |  |  | 893 |
Acquisition of subsidiaries with noncontrolling ownership interest |  | — |  |  | — |  |  | 472 |  |  | 472 |
Related party note receivable |  | — |  |  | — |  |  | 1 |  |  | 1 |
Net income (loss) attributable to NCI |  | 25 |  |  | (63 | ) |  | (64 | ) |  | (102 | )
Related party contributions |  | — |  |  | — |  |  | 11 |  |  | 11 |
Related party distributions |  | — |  |  | — |  |  | (56 | ) |  | (56 | )
Differential membership interests contributions, net of distributions |  | — |  |  | (8 | ) |  | — |  |  | (8 | )
Payments to Class B noncontrolling interest investors |  | (3 | ) |  | — |  |  | — |  |  | (3 | )
Balances, June 30, 2019 |  | 1,673 |  |  | 1,912 |  |  | 671 |  | — |  | 4,256 |
Acquisition of subsidiaries with noncontrolling ownership interest |  | — |  |  | — |  |  | (10 | ) |  | (10 | )
Net income (loss) attributable to NCI |  | 34 |  |  | (64 | ) |  | (143 | ) |  | (173 | )
Related party distributions |  | — |  |  | — |  |  | (71 | ) |  | (71 | )
Changes in non-economic ownership interests |  | — |  |  | — |  |  | (6 | ) |  | (6 | )
Differential membership interests contributions, net of distributions |  | — |  |  | 27 |  |  | — |  |  | 27 |
Payments to Class B noncontrolling interest investors |  | (7 | ) |  | — |  |  | — |  |  | (7 | )
Balances, September 30, 2019 |  | $ | 1,700 |  |  | $ | 1,875 |  |  | $ | 441 |  |  | $ | 4,016 |
|  | Differential Membership Interests |  | Noncontrolling Ownership Interests in NEP OpCo and Texas pipeline |  | Total Noncontrolling Interests
Nine months ended September 30, 2018 |  | (millions)
Balances, December 31, 2017 |  | $ | — |  |  | $ | 34 |  |  | $ | 34 |
Related party note receivable |  | — |  |  | 29 |  |  | 29 |
Net income (loss) attributable to NCI |  | (269 | ) |  | 170 |  |  | (99 | )
Other comprehensive income |  | — |  |  | 1 |  |  | 1 |
Related party distributions |  | — |  |  | (64 | ) |  | (64 | )
Changes in non-economic ownership interests |  | — |  |  | (6 | ) |  | (6 | )
Differential membership interests contributions, net of distributions |  | 23 |  |  | — |  |  | 23 |
Adoption of accounting standards update |  | 1,413 |  |  | 1 |  |  | 1,414 |
Balances, March 31, 2018 |  | 1,167 |  |  | 165 |  | — |  | 1,332 |
Related party note receivable |  | — |  |  | 2 |  |  | 2 |
Net income (loss) attributable to NCI |  | (39 | ) |  | 243 |  |  | 204 |
Other comprehensive loss |  | — |  |  | (4 | ) |  | (4 | )
Related party distributions |  | — |  |  | (41 | ) |  | (41 | )
Changes in non-economic ownership interests |  | — |  |  | 1 |  |  | 1 |
Differential membership interests contributions, net of distributions |  | (6 | ) |  | — |  |  | (6 | )
Disposal of Canadian Holdings |  | — |  |  | 105 |  |  | 105 |
Adoption of accounting standards update |  | — |  |  | 2 |  |  | 2 |
Balances, June 30, 2018 |  | 1,122 |  |  | 473 |  | — |  | 1,595 |
Net income (loss) attributable to NCI |  | (28 | ) |  | 99 |  |  | 71 |
Other comprehensive income |  | — |  |  | 15 |  |  | 15 |
Related party contributions |  | — |  |  | 1 |  |  | 1 |
Related party distributions |  | — |  |  | (48 | ) |  | (48 | )
Changes in non-economic ownership interests |  | — |  |  | (1 | ) |  | (1 | )
Differential membership interests contributions, net of distributions |  | 23 |  |  | — |  |  | 23 |
Balances, September 30, 2018 |  | $ | 1,117 |  |  | $ | 539 |  |  | $ | 1,656 |

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- Definition The entire disclosure for all significant accounting policies of the reporting entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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