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SHARE CAPITAL - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 06, 2019
Feb. 28, 2018
Mar. 01, 2017
Nov. 02, 2016
Mar. 02, 2016
Mar. 27, 2019
May 22, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 16, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]                      
Quarterly dividend declared (in CAD per share) $ 0.375 $ 0.335 $ 0.275 $ 0.25 $ 0.23            
Share repurchase term             12 months        
Shares repurchased and retired (in shares)               30,857,727      
Weighted average price per share of shares repurchased and retired (in CAD per share)               $ 41.56      
Purchase of common shares under Normal Course Issuer Bid               $ (1,282)      
Top of range                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                      
Shares authorized to be repurchased through Normal Course Issuer Bid (in shares)                     61,454,856
Stock options                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                      
Vesting term               5 years      
Shares that may be reserved for issuance as a percentage of common shares outstanding               9.00%      
Stock options | Bottom of range                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                      
Expiration term               5 years      
Stock options | Top of range                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                      
Expiration term               6 years      
Retained earnings                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                      
Purchase of common shares under Normal Course Issuer Bid               $ 1,044 $ 0 $ 0  
Purchase Of Common Shares For Retirement                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                      
Shares repurchased and retired (in shares)           4,340,000          
Weighted average price per share of shares repurchased and retired (in CAD per share)           $ 35.86          
Purchase of common shares under Normal Course Issuer Bid           $ (156)