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DEBT - Narrative (Details)
3 Months Ended 9 Months Ended
Oct. 01, 2020
USD ($)
Jul. 24, 2020
CAD ($)
Mar. 31, 2020
CAD ($)
Feb. 25, 2020
USD ($)
credit_facility
Feb. 24, 2020
USD ($)
Sep. 30, 2020
CAD ($)
Sep. 30, 2020
CAD ($)
Sep. 30, 2020
USD ($)
Apr. 09, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Line of Credit Facility [Line Items]                    
Commitment fee percentage             30.00%      
Long-term debt           $ 62,967,000,000 $ 62,967,000,000     $ 59,661,000,000
Principal amount of debt           2,500,000,000 2,500,000,000 $ 1,800,000,000    
Long-term debt, fair value adjustment             783,000,000      
Amortization of fair value adjustment           13,000,000 42,000,000      
Commercial paper and credit facility draws                    
Line of Credit Facility [Line Items]                    
Long-term debt           8,700,000,000 8,700,000,000     9,000,000,000.0
Fixed-to-floating subordinated term notes | Subordinated term notes                    
Line of Credit Facility [Line Items]                    
Subordinated debt           8,000,000,000.0 8,000,000,000.0     8,000,000,000.0
Fixed-to-fixed subordinated term notes | Subordinated term notes                    
Line of Credit Facility [Line Items]                    
Subordinated debt           6,600,000,000 6,600,000,000     6,600,000,000
Committed credit facilities                    
Line of Credit Facility [Line Items]                    
Amount of credit facility           24,327,000,000 24,327,000,000      
Unutilized amount of facility           14,005,000,000 14,005,000,000      
Non-revolving credit facility                    
Line of Credit Facility [Line Items]                    
Amount of credit facility         $ 1,000,000,000.0          
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           $ 3,000,000,000.0  
Term of debt instrument     1 year              
Revolving credit facility | Extendible Credit Facility                    
Line of Credit Facility [Line Items]                    
Term out provision   1 year                
Term of debt instrument   364 days                
Portion of credit facility extended   $ 10,000,000,000.0                
Uncommitted demand credit facilities                    
Line of Credit Facility [Line Items]                    
Amount of credit facility           861,000,000 861,000,000     916,000,000
Unutilized amount of facility           524,000,000 $ 524,000,000     $ 476,000,000
Enbridge Pipelines Inc. | Committed credit facilities                    
Line of Credit Facility [Line Items]                    
Term out provision             1 year      
Amount of credit facility           3,000,000,000 $ 3,000,000,000      
Unutilized amount of facility           1,062,000,000 $ 1,062,000,000      
Enbridge Gas Inc. | Committed credit facilities                    
Line of Credit Facility [Line Items]                    
Term out provision             1 year      
Amount of credit facility           2,000,000,000 $ 2,000,000,000      
Unutilized amount of facility           $ 1,031,000,000 $ 1,031,000,000      
Spectra Energy Partners, LP | 3.10% 20-Year Senior Notes | Senior Notes | Subsequent event                    
Line of Credit Facility [Line Items]                    
Term of debt instrument 20 years                  
Principal amount of debt $ 300,000,000                  
Interest rate (as a percent) 3.10%                  
Spectra Energy Partners, LP | 4.13% Senior Notes | Senior Notes | Subsequent event                    
Line of Credit Facility [Line Items]                    
Principal amount of debt $ 300,000,000                  
Interest rate (as a percent) 4.13%