Represents the number of preferred stock held by the noncontrolling owners.

No definition available.

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- 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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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Data Type:	na
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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NONCONTROLLING INTERESTS - NONCONTROLLING (Details) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Aug. 01, 2018
NONCONTROLLING INTERESTS
Noncontrolling interests	$ 3,364	$ 3,965
Algonquin Gas Transmission LLC
NONCONTROLLING INTERESTS
Noncontrolling interests	394	518
Maritimes and Northeast Pipeline
NONCONTROLLING INTERESTS
Noncontrolling interests	579	613
Renewable energy assets
NONCONTROLLING INTERESTS
Noncontrolling interests	1,864	1,961
Westcoast Energy Inc.
NONCONTROLLING INTERESTS
Noncontrolling interests	527	841
Other Non Controlling Interest
NONCONTROLLING INTERESTS
Noncontrolling interests	$ 0	$ 32
Canadian Renewable Assets \| Discontinued Operations, Disposed of by Sale
NONCONTROLLING INTERESTS
Noncontrolling interest, ownership percentage by parent			49.00%
Magic Valley
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners	20.00%	20.00%
Maritimes and Northeast Pipeline
NONCONTROLLING INTERESTS
Ownership interest percentage held by noncontrolling owners	22.20%	22.20%
Cumulative redeemable preferred stock \| Westcoast Energy Inc. \| Preference shares
NONCONTROLLING INTERESTS
Number of redeemable preferred shares held by noncontrolling owners (in shares)	16,600,000	16,600,000
Cumulative first preferred stock \| Westcoast Energy Inc. \| Preference shares
NONCONTROLLING INTERESTS
Number of redeemable preferred shares held by noncontrolling owners (in shares)	0	12,000,000