SEGMENTED INFORMATION - Reconciliation of FFO to Equity Accounted Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Operating Segments [Abstract]
Consolidated equity accounted income	$ 1,213	$ 1,293
Non-FFO items from equity accounted investments	856	458
Consolidated equity accounted income	$ 2,069	$ 1,751

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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