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INCOME TAXES - Provision (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current      
Canada $ 84 $ 65 $ 113
Foreign 615 250 36
Total 699 315 149
Deferred      
Canada (29) 49 (185)
Foreign 84 235 751
Deferred – U.S. Tax Reform and 2018 FERC Actions 0 (167) (804)
Total 55 117 (238)
Income Tax (Recovery)/Expense $ 754 $ 432 $ (89)