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DEBT - NEW DEBT (Details)
¥ in Millions, CAD in Millions, $ in Millions
3 Months Ended
Jun. 30, 2017
USD ($)
Mar. 31, 2017
JPY (¥)
Jun. 30, 2017
CAD
Mar. 31, 2017
CAD
Unsecured medium-term notes with maturity dates ranging from 2022 to 2044        
DEBT        
Face amount of notes issued | CAD     CAD 1,200  
Unsecured medium-term notes with maturity dates ranging from 2022 to 2044 | Minimum        
DEBT        
Interest rate (as a percent) 3.20%   3.20%  
Unsecured medium-term notes with maturity dates ranging from 2022 to 2044 | Maximum        
DEBT        
Interest rate (as a percent) 4.60%   4.60%  
Unsecured floating rate notes maturing in 2019        
DEBT        
Face amount of notes issued | CAD     CAD 750  
Unsecured floating rate notes maturing in 2019 | Three-month banker's acceptance rate        
DEBT        
Basis spread on variable rate (as a percent) 0.59%      
Unsecured floating rate notes maturing in 2020        
DEBT        
Face amount of notes issued | $ $ 500      
Unsecured floating rate notes maturing in 2020 | Three-month LIBOR rate        
DEBT        
Basis spread on variable rate (as a percent) 0.70%      
SEP issue of unsecured floating rate notes maturing in 2020 | Three-month LIBOR rate        
DEBT        
Basis spread on variable rate (as a percent) 0.70%      
SEP issue of unsecured floating rate notes maturing in 2020 | Spectra Energy Partners, LP        
DEBT        
Face amount of notes issued | $ $ 400      
Credit facility with syndicate of Japanese banks        
DEBT        
Maturity period of debt   5 years    
Amount of credit facility   ¥ 20,000   CAD 239