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DEBT - Narrative (Details)
3 Months Ended 9 Months Ended
Jul. 18, 2019
CAD ($)
May 16, 2019
CAD ($)
Feb. 08, 2019
CAD ($)
Sep. 30, 2019
CAD ($)
Sep. 30, 2019
CAD ($)
May 16, 2019
JPY (¥)
Dec. 31, 2018
CAD ($)
Line of Credit Facility [Line Items]              
Increase in credit facility     $ 444,000,000        
Commitment fee percentage         0.10%    
Long-term debt       $ 60,879,000,000 $ 60,879,000,000   $ 60,327,000,000
Long-term debt, fair value adjustment         876,000,000    
Amortization of fair value adjustment       17,000,000 50,000,000    
Extendible credit facility              
Line of Credit Facility [Line Items]              
Debt instrument, term   3 years          
Amount of credit facility   $ 641,000,000       ¥ 52,500,000,000  
non-revolving, bilateral credit facility              
Line of Credit Facility [Line Items]              
Debt instrument, term 5 years            
Amount of credit facility $ 500,000,000            
Uncommitted demand credit facilities              
Line of Credit Facility [Line Items]              
Amount of credit facility       928,000,000 928,000,000   807,000,000
Unutilized amount of facility       588,000,000 588,000,000   548,000,000
Commercial paper and credit facility draws              
Line of Credit Facility [Line Items]              
Long-term debt       11,634,000,000 11,634,000,000   7,967,000,000
Subordinated Debt | Fixed to Floating Subordinated Term Notes              
Line of Credit Facility [Line Items]              
Subordinated debt       $ 6,637,000,000 $ 6,637,000,000   $ 7,317,000,000