Condensed Consolidated Statements of Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Related party revenues	$ 7	$ 1	$ 11	$ 2
Operations and maintenance related to renewable energy projects	48	47	99	85
Operations and maintenance related to Texas pipelines	11	8	22	21
Operations and maintenance related party	$ 34	$ 24	$ 66	$ 48

Utilities Operating Expense, Maintenance and Operations, Oil and Gas

No definition available.

Name:	nep_UtilitiesOperatingExpenseMaintenanceandOperationsOilandGas
Namespace Prefix:	nep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Utilities Operating Expense, Maintenance and Operations, Related Party

+ References

No definition available.

+ Details

Name:	nep_UtilitiesOperatingExpenseMaintenanceandOperationsRelatedParty
Namespace Prefix:	nep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Utilities Operating Expense, Maintenance and Operations Related to Renewable Energy Projects

+ References

No definition available.

+ Details

Name:	nep_UtilitiesOperatingExpenseMaintenanceandOperationsRelatedtoRenewableEnergyProjects
Namespace Prefix:	nep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration