Represents the capacity in megawatts of the wind project acquired.

No definition available.

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- Definition

The pro forma earnings before interest and income taxes for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

+ Details

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- 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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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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- Definition

The amount of property, plant, and equipment recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464

+ Details

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

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Details

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ACQUISITIONS AND DISPOSITIONS - Other Acquistions (Narrative) (Details) $ in Millions							1 Months Ended		12 Months Ended
	Nov. 02, 2016 CAD	Nov. 02, 2016 USD ($)	Sep. 09, 2016 CAD MW	Sep. 09, 2016 USD ($) MW	Feb. 27, 2015 CAD	Feb. 27, 2015 USD ($)	Nov. 30, 2015 CAD MW	Nov. 30, 2015 USD ($) MW	Dec. 31, 2017 CAD	Dec. 31, 2016 CAD	Dec. 31, 2015 CAD	Nov. 02, 2016 USD ($)	Sep. 09, 2016 USD ($)	Nov. 30, 2015 USD ($)	Feb. 27, 2015 USD ($)
Business Acquisition [Line Items]
Cash consideration \| CAD									CAD 0	CAD 644,000,000	CAD 106,000,000
Chapman Ranch
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)			100.00%										100.00%
Capacity acquired (in megawatts) \| MW			249	249
Cash consideration	CAD 40,000,000	$ 30	CAD 65,000,000	$ 50
Purchase price allocated to property, plant and equipment	23,000,000		CAD 62,000,000									$ 17	$ 48
Pro forma effect on earnings \| CAD	CAD 0
New Creek
Business Acquisition [Line Items]
Ownership interest acquired (as a percent)							100.00%							100.00%
Capacity acquired (in megawatts) \| MW							103	103
Cash consideration							CAD 48,000,000	$ 36
Purchase price allocated to property, plant and equipment							CAD 35,000,000							$ 26
Midstream Business
Business Acquisition [Line Items]
Cash consideration					CAD 106,000,000	$ 85
Purchase price allocated to property, plant and equipment					69,000,000										$ 55
Contingent future payment (up to)					CAD 21,000,000										$ 17