XML 30 R43.htm IDEA: XBRL DOCUMENT
v3.19.3

Summary of Significant Accounting and Reporting Policies - Narrative (Details) $ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 29, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 CAD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) solar_generation_facility wind_generation_facility MW | Sep. 30, 2019 USD ($) pipeline | Sep. 30, 2018 USD ($) solar_generation_facility wind_generation_facility MW | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  | $ 4 |  |  | $ 4 |  |  | $ 8
Restricted cash, noncurrent |  |  |  | 11 |  |  | 11 |  |  | $ 11
Proceeds from the sale of Canadian Holdings - net |  |  |  |  |  |  | 0 | $ 517 | [1] |
Gain on disposal of Canadian Holdings |  |  |  | 0 | $ 0 | [2] | 0 | 153 | [1],[2] |
Income before income taxes |  |  |  | $ (261) | 125 | [2] | $ (523) | 396 | [2] |
Canadian Holdings [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  | 47 |  |
Non Affiliated Party [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling ownership interest |  |  |  | 10.00% |  |  | 10.00% |  |  |
Number Of Pipelines | pipeline |  |  |  |  |  |  | 1 |  |  |
NEP OpCo [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling ownership interest |  |  |  | 62.50% |  |  | 62.50% |  |  |
Silver State [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling ownership interest |  |  |  | 50.00% |  |  | 50.00% |  |  |
Canadian Holdings [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of Canadian Holdings - net | $ 563 |  | $ 740 |  |  |  |  |  |  |
Post-closing working capital adjustments |  | $ 1 |  |  |  |  |  |  |  |
Assumption of existing debt |  |  |  |  | $ 676 |  |  | $ 676 |  |
Number of wind generation facilities | wind_generation_facility |  |  |  |  | 4 |  |  | 4 |  |
Number of solar generation facilities | solar_generation_facility |  |  |  |  | 2 |  |  | 2 |  |
Generation facility capacity (mw) | MW |  |  |  |  | 396 |  |  | 396 |  |
Gain on disposal of Canadian Holdings |  | 153 |  |  |  |  |  |  |  |
Gain on disposal of Canadian Holdings, after tax |  | $ 201 |  |  |  |  |  |  |  |
[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 Disposal Group, Including Discontinued Operation, Liabilities Assumed + References No definition available. + Details
Name: | nep_DisposalGroupIncludingDiscontinuedOperationLiabilitiesAssumed
Namespace Prefix: | nep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disposal Group, Including Discontinued Operation, Working Capital Adjustment + References No definition available. + Details
Name: | nep_DisposalGroupIncludingDiscontinuedOperationWorkingCapitalAdjustment
Namespace Prefix: | nep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gain (Loss) On Disposition Of Business, Net Of Tax + References No definition available. + Details
Name: | nep_GainLossOnDispositionOfBusinessNetOfTax
Namespace Prefix: | nep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Generation Facility Capacity + References No definition available. + Details
Name: | nep_GenerationFacilityCapacity
Namespace Prefix: | nep_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Pipelines + References No definition available. + Details
Name: | nep_NumberOfPipelines
Namespace Prefix: | nep_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Wind Generation Facilities + References No definition available. + Details
Name: | nep_NumberOfWindGenerationFacilities
Namespace Prefix: | nep_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Solar Generation Facilities + References No definition available. + Details
Name: | nep_NumberofSolarGenerationFacilities
Namespace Prefix: | nep_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
Name: | us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 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(10)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: 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(8)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 5: 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(15)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 + Details
Name: | us-gaap_RestrictedCashCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=116631420&loc=SL116631458-115580 + Details
Name: | us-gaap_RestrictedCashNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- Details
Name: | srt_OwnershipAxis=nep_NEPOpCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=nep_SilverStateSouthSolarLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=nep_CanadianHoldingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |