ACQUISITIONS - TerraForm Global (Details) - TerraForm Global - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2017	Nov. 30, 2017
Disclosure of detailed information about business combination [line items]
Percentage of voting equity interests acquired	100.00%	100.00%
Consideration transferred, acquisition-date fair value	$ 657	$ 657
Acquisition-date fair value of equity interest in acquiree held by acquirer immediately before acquisition date	$ 30	$ 30	$ 100
Percentage of voting equity interests retained by Brookfield	31.00%	31.00%
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination	$ 2	$ 250
Acquisition costs incurred and capitalized	1
Brookfield Renewable
Disclosure of detailed information about business combination [line items]
Consideration transferred, acquisition-date fair value	$ 202	$ 202

The percentage of voting equity interests retained in a business combination. [Refer: Business combinations [member]]

No definition available.

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- Definition

The acquisition-date fair value of equity interest in the acquiree held by the acquirer immediately before the acquisition date in a business combination achieved in stages. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
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- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of acquisition-related costs recognised as an expense for transactions that are recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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The gain (loss) recognised as result of remeasuring to fair value the equity interest in the acquiree held by the acquirer before the business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

+ References

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