SEGMENTED INFORMATION - Reconciliation of FFO to Equity Accounted Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of operating segments [abstract]
Consolidated equity accounted income	$ 1,088	$ 1,213
Non-FFO items from equity accounted investments	1,284	856
FFO from equity accounted investments	$ 2,372	$ 2,069

The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

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