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COMMON SHARES - Stock Options Assumptions Used (Details) - CAD
CAD / shares in Units, CAD in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]      
Weighted average fair value CAD 5.67 CAD 6.45 CAD 5.54
Expected life (years) 5 years 9 months 9 days 5 years 9 months 6 years
Interest rate 0.70% 1.10% 1.80%
Volatility 21.00% 18.00% 17.00%
Dividend yield 4.90% 3.70% 3.80%
Forfeiture rate 5.00% 5.00% 5.00%
Expense for stock options CAD 15 CAD 13 CAD 7
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Expiration period 7 years