XML 53 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Commitments and Contingencies - Commitments (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) project
Operating Leased Assets [Line Items] |
Payments for acquisition holdback | $ 200
Genesis [Member] | Surety Bond [Member] |
Operating Leased Assets [Line Items] |
Surety bond | $ 23
Minimum Required Domestic Content Level [Member] |
Operating Leased Assets [Line Items] |
Number of projects | project | 2
Minimum MRDCL for two projects (as a percent) | 25.00%
Minimum MRDCL for two Canadian FIT contracts (as a percent) | 50.00%
MRDCL supply period | 7 years

X
- Definition Payments for Acquisition Holdback + References No definition available. + Details
Name: | nep_PaymentsforAcquisitionHoldback
Namespace Prefix: | nep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Supply Commitment, Initial Supply Commitment Level, Percent + References No definition available. + Details
Name: | nep_SupplyCommitmentInitialSupplyCommitmentLevelPercent
Namespace Prefix: | nep_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Supply Commitment, Number of Projects + References No definition available. + Details
Name: | nep_SupplyCommitmentNumberofProjects
Namespace Prefix: | nep_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Supply Commitment, Secondary Supply Commitment Level, Percent + References No definition available. + Details
Name: | nep_SupplyCommitmentSecondarySupplyCommitmentLevelPercent
Namespace Prefix: | nep_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Supply Commitment, Supply Commitment Period + References No definition available. + Details
Name: | nep_SupplyCommitmentSupplyCommitmentPeriod
Namespace Prefix: | nep_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6395354&loc=d3e12631-108344 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=nep_GenesisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_SuretyBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=us-gaap_SupplyCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |