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SUBSIDIARIES (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.K. regulated distribution operation
Disclosure of subsidiaries [line items]
Effective Ownership Interest (%)	80.00%	80.00%	80.00%
Voting Interest (%)	80.00%	80.00%	80.00%
Brazilian regulated gas transmission operation(1)
Disclosure of subsidiaries [line items]
Effective Ownership Interest (%)	28.00%	28.00%	28.00%
Voting Interest (%)	90.00%	90.00%	90.00%

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- Definition

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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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

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- Definition

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