ACQUISITIONS - India Wind Portfolio (Details) - India Wind Portfolio $ in Millions, ₨ in Billions	1 Months Ended	12 Months Ended
Jul. 08, 2019 USD ($) MW	Dec. 31, 2019 USD ($)	Jul. 08, 2019 INR (₨) MW	Jun. 07, 2019 MW
Disclosure of detailed information about business combination [line items]
Wind power capacity \| MW	105		105	105
Consideration transferred, acquisition-date fair value	$ 67		₨ 4.6
Contingent payment expected	$ 12		₨ 0.8
Percentage of economic interest	25.00%		25.00%
Percentage of voting equity interests acquired	100.00%		100.00%
Acquisition costs (less than)	$ 1
Revenue of combined entity as if combination occurred at beginning of period		$ 37

Acquisition Costs

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Consideration Transferred, Contingent Payment

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Percentage Of Economic Interests Acquired

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- Definition

Wind Power Capacity

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- Definition

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

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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

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The revenue of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Business combinations [member]; Revenue]

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