SEGMENTED INFORMATION - Reconciliation of FFO to Equity Accounted Investments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Segments [Abstract]
Consolidated equity accounted income	$ 342	$ 250	$ 630	$ 585
Non-FFO items from equity accounted investments	283	241	616	363
FFO from equity accounted investments	$ 625	$ 491	$ 1,246	$ 948

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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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective on first application of IFRS 9
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