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- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

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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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- Definition

The cash outflow to acquire interests in joint ventures (other than payments for those instruments considered to be cash equivalents or those held for dealing or trading purposes), classified as investing activities. [Refer: Joint ventures [member]]

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- Definition

The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

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COMMITMENTS, CONTINGENCIES AND GUARANTEES - Narrative (Details) $ in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 CAD ($)
Disclosure of finance lease and operating lease by lessee [line items]
Investment in equity accounted investments		$ 4	$ 420	$ 4	$ 420
TransAlta
Disclosure of finance lease and operating lease by lessee [line items]
Increase in ownership percentage						9.00%
Tranche 2 \| TransAlta
Disclosure of finance lease and operating lease by lessee [line items]
Capital commitments						$ 400
X-Elio
Disclosure of finance lease and operating lease by lessee [line items]
Investment in equity accounted investments	$ 500
Ownership interest	25.00%