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REVENUE - Narrative (Details) - 3 months ended Mar. 31, 2018
$ in Millions, $ in Millions
CAD ($)
USD ($)
Revenue from Contract with Customer [Abstract]    
Revenue recognized $ 95  
Increase (Decrease) in Contract with Customers, Liability   $ 96
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation 5,700  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation 5,900  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 63,800