ACQUISITIONS - China Wind Facility (Details) - China Wind Facility ¥ in Millions, $ in Millions		12 Months Ended
Sep. 30, 2019 USD ($) MW	Dec. 31, 2019 USD ($)	Sep. 30, 2019 CNY (¥) MW
Disclosure of detailed information about business combination [line items]
Wind power capacity \| MW	200		200
Consideration transferred, acquisition-date fair value	$ 160		¥ 1,140
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 acquirees as if combination occurred at beginning of period		$ 44

Acquisition Costs

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Percentage Of Economic Interests Acquired

+ References

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- Definition

Wind Power Capacity

+ References

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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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-IssueDate 2021-01-01
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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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- Definition

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

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-IssueDate 2021-01-01
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- Definition

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]

+ References

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