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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Fair Value of Non-Derivative Financial Instruments (Details)
CAD in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Carrying and fair values of non-derivative financial instruments        
Current and Long-Term Debt CAD (31,584) CAD (24,757)    
Junior subordinated notes (Note 17) (2,422) (1,160)    
Long-term Debt | $     $ 850 $ 400
Interest rate swap agreements        
Carrying and fair values of non-derivative financial instruments        
Fair value adjustments (losses) 2 (3)    
Long-term debt hedged | $     $ 850 $ 400
Level II | Carrying Amount        
Carrying and fair values of non-derivative financial instruments        
Notes receivable 214 213    
Current and Long-Term Debt (31,584) (24,757)    
Junior subordinated notes (Note 17) (2,422) (1,160)    
Total liabilities (33,792) (25,704)    
Level II | Fair Value        
Carrying and fair values of non-derivative financial instruments        
Notes receivable 265 263    
Current and Long-Term Debt (34,309) (28,713)    
Junior subordinated notes (Note 17) (2,011) (1,157)    
Total liabilities CAD (36,055) CAD (29,607)