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NONCONTROLLING INTERESTS - REDEEMABLE NONCONTROLLING INFORMATION (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
REDEEMABLE NONCONTROLLING INTERESTS      
Balance at beginning of year $ 4,067 $ 3,392 $ 2,141
Earnings attributable to redeemable noncontrolling interests 117 175 268
Change in unrealized loss on cash flow hedges 3 (21) (17)
Other comprehensive loss from equity investees 14 0 0
Reclassification to earnings of loss on cash flow hedges 0 57 9
Foreign currency translation adjustments 4 (6) (3)
Other comprehensive income/(loss) 21 30 (11)
Distributions to unitholders (300) (247) (202)
Contributions from unitholders 70 1,178 591
Modified retrospective adoption of ASC 606 Revenue from Contracts with Customers (Note 3) (38) 0 0
Dilution gain/(loss) for redeemable noncontrolling interests 76 (169) (81)
Redemption value adjustment 456 (292) 686
Sponsored vehicle buy-in (4,469) 0 0
Balance at end of year $ 0 $ 4,067 $ 3,392