XML 78 R67.htm IDEA: XBRL DOCUMENT v3.8.0.1
RELATED PARTY TRANSACTIONS (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Feb. 15, 2017
Sep. 30, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Long-term line of credit   $ 544,000,000  
EUS Credit Agreement [Member]      
Related Party Transaction [Line Items]      
Repayments of lines of credit $ 1,500,000,000    
Enbridge Inc., Credit Agreement [Member]      
Related Party Transaction [Line Items]      
Term of debt instrument   364 days  
Maximum borrowing capacity of line of credit   $ 750,000,000  
Line of credit facility, expiration date   Jul. 23, 2019  
Construction Project Work Force Cost Transactions [Member]      
Related Party Transaction [Line Items]      
Related party expenses   $ 4,800,000 $ 28,400,000
Enbridge Pipelines LLC [Member]      
Related Party Transaction [Line Items]      
Consideration transferred   $ 67,600,000