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DEBT - MATURITIES AND ADDITIONAL DISCLOSURES (Details) - CAD
CAD in Millions
Feb. 27, 2017
Jun. 30, 2017
Dec. 31, 2016
DEBT      
Long-term debt   CAD 62,081 CAD 36,494
Spectra Energy Corp      
DEBT      
Increase in debt due to the Merger Transaction CAD 22,978    
Uncommitted demand credit facilities      
DEBT      
Amount of credit facility   556 335
Unutilized amount of facility   148 177
Commercial paper and credit facility draws      
DEBT      
Long-term debt   13,377 CAD 7,344
Debenture, term note and non-revolving credit facility      
Annual maturities      
2017   1,138  
2018   3,227  
2019   4,790  
2020   5,191  
2021   2,787  
Thereafter   34,510  
Interest obligations      
2017   1,238  
2018   2,336  
2019   2,127  
2020   1,905  
2021   1,726  
Thereafter   CAD 19,412