Asset Acquisition, Consideration Transferred

No definition available.

Name:	pegi_AssetAcquisitionConsiderationTransferred
Namespace Prefix:	pegi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Asset Acquisition Percentage Of Shares Acquired

+ References

No definition available.

+ Details

Name:	pegi_AssetAcquisitionPercentageOfSharesAcquired
Namespace Prefix:	pegi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Power generation capacity.

+ References

No definition available.

+ Details

Name:	pegi_GeneratingCapacity
Namespace Prefix:	pegi_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

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

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Acquisitions - Narrative (Details) $ in Millions			3 Months Ended	9 Months Ended
Acquisitions - Narrative (Details) $ in Millions	Aug. 10, 2018 USD ($) MW	Mar. 07, 2018 USD ($) MW	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) GW	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Generating capacity \| GW				4.4
Contingent consideration \| $				$ 129		$ 31
Tsugaru Holdings
Business Acquisition [Line Items]
Consideration \| $		$ 264
Contingent consideration \| $				$ 122
Transaction costs \| $			$ 1		$ 1
Tsugaru Holdings \| Tsugaru \| Aomori Prefecture, Japan
Business Acquisition [Line Items]
Generating capacity		122
Tsugaru Holdings \| Ohorayama \| Kochi Prefecture, Japan
Business Acquisition [Line Items]
Generating capacity		33
Tsugaru Holdings \| Kanagi \| Shimane Prefecture, Japan
Business Acquisition [Line Items]
Generating capacity		10
Tsugaru Holdings \| Otsuki \| Kochi Prefecture, Japan
Business Acquisition [Line Items]
Generating capacity		12
Tsugaru Holdings \| Futtsu \| Chiba Prefecture, Japan
Business Acquisition [Line Items]
Generating capacity		29
MSM
Business Acquisition [Line Items]
Generating capacity	143
Consideration transferred \| $	$ 31
MSM \| MSM LP Holdings LP
Business Acquisition [Line Items]
Percentage of shares acquired	51.00%
MSM \| Pattern MSM GP Holdings, Inc.
Business Acquisition [Line Items]
Percentage of shares acquired	70.00%
MSM \| Pattern Development MSM Management ULC
Business Acquisition [Line Items]
Percentage of shares acquired	70.00%
MSM LP Holdings LP \| MSM
Business Acquisition [Line Items]
Percentage of shares acquired	99.98%