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DEBT - Narrative (Details)
3 Months Ended
Apr. 01, 2020
CAD ($)
Mar. 31, 2020
CAD ($)
Feb. 25, 2020
USD ($)
credit_facility
Feb. 24, 2020
USD ($)
Mar. 31, 2020
CAD ($)
Apr. 09, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Line of Credit Facility [Line Items]              
Commitment fee percentage         0.10%    
Long-term debt   $ 63,571,000,000     $ 63,571,000,000   $ 59,661,000,000
Long-term debt, fair value adjustment         847,000,000    
Amortization of fair value adjustment         15,000,000    
Commercial paper and credit facility draws              
Line of Credit Facility [Line Items]              
Long-term debt   9,855,000,000     9,855,000,000   8,974,000,000
10-year medium term notes | Medium-term notes | Subsequent event              
Line of Credit Facility [Line Items]              
Term of debt instrument 10 years            
Principal amount of debt $ 600,000,000            
Interest rate (as a percent) 2.90%            
30-year medium term notes | Medium-term notes | Subsequent event              
Line of Credit Facility [Line Items]              
Term of debt instrument 30 years            
Principal amount of debt $ 600,000,000            
Interest rate (as a percent) 3.65%            
Fixed-to-floating subordinated term notes | Subordinated term notes              
Line of Credit Facility [Line Items]              
Subordinated debt   6,955,000,000     6,955,000,000   6,550,000,000
Non-revolving credit facility              
Line of Credit Facility [Line Items]              
Amount of credit facility       $ 1,000,000,000      
Term of debt instrument       2 years      
Non-revolving, bilateral credit facility              
Line of Credit Facility [Line Items]              
Amount of credit facility     $ 500,000,000        
Number of credit facilities | credit_facility     2        
Term of debt instrument     1 year        
Revolving credit facility              
Line of Credit Facility [Line Items]              
Amount of credit facility   $ 1,700,000,000     1,700,000,000    
Term of debt instrument   1 year          
Revolving credit facility | Subsequent event              
Line of Credit Facility [Line Items]              
Amount of credit facility           $ 3,000,000,000.0  
Uncommitted demand credit facilities              
Line of Credit Facility [Line Items]              
Amount of credit facility   $ 806,000,000     806,000,000   916,000,000
Unutilized amount of facility   $ 523,000,000     $ 523,000,000   $ 476,000,000