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INCOME TAXES - Schedule of Provision For Income Tax Rate Reconciliation (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Canadian statutory income tax rate 27.00% 27.00% 27.00%
Income tax provision at statutory rate $ 951 $ 776 $ (287)
UK PRT and other taxes (3) (67) (324)
Impact of deductible UK PRT and other taxes on corporate income tax 3 28 131
Foreign and domestic tax rate differentials 6 (43) (54)
Non-taxable portion of capital gains/losses 142 (86) (80)
Stock options exercised for common shares (41) 33 94
Income tax rate and other legislative changes 0 10 (107)
Non-taxable gain on corporate acquisitions (119) (63) 0
Revisions arising from prior year tax filings (136) (3) (120)
Change in unrecognized capital loss carryforward asset 142 (86) (80)
Other (14) (23) (32)
Income tax expense (recovery) $ 931 $ 476 $ (859)