XML 63 R44.htm IDEA: XBRL DOCUMENT
v3.19.3

Summary of Significant Accounting and Reporting Policies - Noncontrolling Interests (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Apr. 01, 2018 | Jan. 01, 2018
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balances, beginning of period |  |  |  | $ 3,192,000,000 | $ 0 |  |  |  |  |  | $ 3,192,000,000 |  |  |  |
Sale of Class B noncontrolling interest - net |  |  | $ 893,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of subsidiaries with noncontrolling ownership interest |  | $ 11,000,000 | 472,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Related party note receivable |  |  | 1,000,000 |  |  |  | $ 2,000,000 | [1] | $ 29,000,000 | [1] |  |  |  |  |
Net income (loss) attributable to NCI |  | (173,000,000) |  |  | 71,000,000 | [2] |  |  |  |  | (380,000,000) | $ 176,000,000 | [2] |  |
Related party contributions |  |  | 11,000,000 | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |
Related party distributions |  | (71,000,000) | (56,000,000) | (51,000,000) | (48,000,000) |  | (41,000,000) | [1] | (64,000,000) | [1] |  |  |  |  |
Changes in non-economic ownership interests |  | (6,000,000) |  | (6,000,000) | (1,000,000) | [1] | 1,000,000 | [1] | (6,000,000) | [1] |  |  |  |  |
Payments to Class B noncontrolling interests investors |  | (7,000,000) | (3,000,000) | (5,000,000) |  |  |  |  |  |  |  |  |  |  |
Adoption of accounting standards update | [1] |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 1,423,000,000
Other |  | 0 | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Balances, end of period |  | 4,016,000,000 |  |  |  |  | 0 |  |  |  | 4,016,000,000 |  |  |  |
Net income (loss) attributable to NCI |  | (173,000,000) |  |  | 71,000,000 | [2] |  |  |  |  | (380,000,000) | 176,000,000 | [2] |  |
Net loss attributable to NEP – basic |  | 72,000,000 |  |  | (33,000,000) | [2] |  |  |  |  | 122,000,000 | (189,000,000) | [2] |  |
Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) attributable to noncontrolling interest, before tax |  |  |  |  |  |  |  |  |  |  |  | 231,000,000 |  |  |
Noncontrolling Ownership Interests In NEP OpCo Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balances, beginning of period |  | 1,673,000,000 | 758,000,000 | 751,000,000 |  |  |  |  |  |  | 751,000,000 |  |  |  |
Sale of Class B noncontrolling interest - net |  |  | 893,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to NCI |  | 34,000,000 | 25,000,000 | 12,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments to Class B noncontrolling interests investors |  | (7,000,000) | (3,000,000) | (5,000,000) |  |  |  |  |  |  |  |  |  |  |
Balances, end of period |  | 1,700,000,000 | 1,673,000,000 | 758,000,000 |  |  |  |  |  |  | 1,700,000,000 |  |  |  |
Net income (loss) attributable to NCI |  | 34,000,000 | 25,000,000 | 12,000,000 |  |  |  |  |  |  |  |  |  |  |
Differential Membership Interests [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balances, beginning of period |  | 1,912,000,000 | 1,983,000,000 | 2,019,000,000 | 1,122,000,000 |  | 1,167,000,000 |  | 0 |  | 2,019,000,000 | 0 |  |  |
Net income (loss) attributable to NCI |  | (64,000,000) | (63,000,000) | (60,000,000) | (28,000,000) |  | (39,000,000) |  | (269,000,000) |  |  |  |  |  |
Differential membership interests contributions, net of distributions |  | 27,000,000 | (8,000,000) | 24,000,000 | 23,000,000 |  | (6,000,000) |  | 23,000,000 |  |  |  |  |  |
Adoption of accounting standards update |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,413,000,000
Balances, end of period |  | 1,875,000,000 | 1,912,000,000 | 1,983,000,000 | 1,117,000,000 |  | 1,122,000,000 |  | 1,167,000,000 |  | 1,875,000,000 | 1,117,000,000 |  |  |
Net income (loss) attributable to NCI |  | (64,000,000) | (63,000,000) | (60,000,000) | (28,000,000) |  | (39,000,000) |  | (269,000,000) |  |  |  |  |  |
Noncontrolling Ownership Interests in NEP OpCo and Texas Pipeline [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balances, beginning of period |  | 671,000,000 | 307,000,000 | 422,000,000 | 473,000,000 |  | 165,000,000 |  | 34,000,000 |  | 422,000,000 | 34,000,000 |  |  |
Sale of Class B noncontrolling interest - net |  |  |  |  |  |  | 105,000,000 |  |  |  |  |  |  |  |
Acquisition of subsidiaries with noncontrolling ownership interest |  | (10,000,000) | 472,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Related party note receivable |  |  | 1,000,000 |  |  |  | 2,000,000 |  | 29,000,000 |  |  |  |  |  |
Net income (loss) attributable to NCI |  | (143,000,000) | (64,000,000) | (57,000,000) | 99,000,000 |  | 243,000,000 |  | 170,000,000 |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | (3,000,000) | 15,000,000 |  | (4,000,000) |  | 1,000,000 |  |  |  |  |  |
Related party contributions |  |  | 11,000,000 | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |
Related party distributions |  | (71,000,000) | (56,000,000) | (51,000,000) | (48,000,000) |  | (41,000,000) |  | (64,000,000) |  |  |  |  |  |
Changes in non-economic ownership interests |  | (6,000,000) |  | (6,000,000) | (1,000,000) |  | 1,000,000 |  | (6,000,000) |  |  |  |  |  |
Adoption of accounting standards update |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 1,000,000
Other |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Balances, end of period |  | 441,000,000 | 671,000,000 | 307,000,000 | 539,000,000 |  | 473,000,000 |  | 165,000,000 |  | 441,000,000 | 539,000,000 |  |  |
Net income (loss) attributable to NCI |  | (143,000,000) | (64,000,000) | (57,000,000) | 99,000,000 |  | 243,000,000 |  | 170,000,000 |  |  |  |  |  |
Non-controlling Interests [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balances, beginning of period |  | 4,256,000,000 | 3,048,000,000 | 3,192,000,000 | 1,595,000,000 |  | 1,332,000,000 |  | 34,000,000 |  | 3,192,000,000 | 34,000,000 |  |  |
Sale of Class B noncontrolling interest - net |  |  | 893,000,000 |  |  |  | 105,000,000 |  |  |  |  |  |  |  |
Acquisition of subsidiaries with noncontrolling ownership interest |  | (10,000,000) | 472,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Related party note receivable |  |  | 1,000,000 |  |  |  | 2,000,000 |  | 29,000,000 |  |  |  |  |  |
Net income (loss) attributable to NCI |  | (173,000,000) | (102,000,000) | (105,000,000) | 71,000,000 |  | 204,000,000 |  | (99,000,000) |  |  |  |  |  |
Other comprehensive income (loss) |  |  |  | (3,000,000) | 15,000,000 |  | (4,000,000) |  | 1,000,000 |  |  |  |  |  |
Related party contributions |  |  | 11,000,000 | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |
Related party distributions |  | (71,000,000) | (56,000,000) | (51,000,000) | (48,000,000) |  | (41,000,000) |  | (64,000,000) |  |  |  |  |  |
Changes in non-economic ownership interests |  | (6,000,000) |  | (6,000,000) | (1,000,000) |  | 1,000,000 |  | (6,000,000) |  |  |  |  |  |
Differential membership interests contributions, net of distributions |  | 27,000,000 | (8,000,000) | 24,000,000 | 23,000,000 |  | (6,000,000) |  | 23,000,000 |  |  |  |  |  |
Payments to Class B noncontrolling interests investors |  | (7,000,000) | (3,000,000) | (5,000,000) |  |  |  |  |  |  |  |  |  |  |
Adoption of accounting standards update |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 | $ 1,414,000,000
Other |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Balances, end of period |  | 4,016,000,000 | 4,256,000,000 | 3,048,000,000 | 1,656,000,000 |  | 1,595,000,000 |  | 1,332,000,000 |  | $ 4,016,000,000 | $ 1,656,000,000 |  |  |
Net income (loss) attributable to NCI |  | $ (173,000,000) | $ (102,000,000) | $ (105,000,000) | $ 71,000,000 |  | $ 204,000,000 |  | $ (99,000,000) |  |  |  |  |  |
[1] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.
[2] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.

X
- Definition Noncontrolling Interest, Decrease from Member Note Receivable + References No definition available. + Details
Name: | nep_NoncontrollingInterestDecreasefromMemberNoteReceivable
Namespace Prefix: | nep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Noncontrolling Interest, Increase (Decrease) in Change in Equity Method Investees + References No definition available. + Details
Name: | nep_NoncontrollingInterestIncreaseDecreaseinChangeinEquityMethodInvestees
Namespace Prefix: | nep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Related Party Contributions + References No definition available. + Details
Name: | nep_RelatedPartyContributions
Namespace Prefix: | nep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Related Party Distributions + References No definition available. + Details
Name: | nep_RelatedPartyDistributions
Namespace Prefix: | nep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
Name: | us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of income (loss) attributable to noncontrolling interest. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_IncomeLossAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_MinorityInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInMinorityInterestRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686 + Details
Name: | us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in noncontrolling interest from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569655-111683 + Details
Name: | us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569655-111683 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. + References No definition available. + Details
Name: | us-gaap_StockholdersEquityOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201705Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=nep_NoncontrollingOwnershipInterestsInSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=nep_DifferentialMembershipInterestsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=nep_NoncontrollingOwnershipInterestsinNEPOpCoandTexasPipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |