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GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2019
Changes in goodwill [abstract]  
Summary of reconciliation of goodwill
The following table provides a reconciliation of goodwill:
(MILLIONS)
Notes
 
Total

Balance, as at December 31, 2017
 
 
$
901

Acquired through acquisition
3
 
27

Transfer to Assets held for sale
5
 
(22
)
Foreign exchange
 
 
(78
)
Balance, as at December 31, 2018
 
 
828

Foreign exchange
 
 
(7
)
Balance, as at December 31, 2019
 
 
$
821