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Debt - Commercial Paper Program (Narrative) (Details) - 6 months ended Jun. 30, 2018
$ in Millions, $ in Millions
CAD ($)
USD ($)
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Credit total available amount   $ 1,000
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Credit total available amount   1,000
Commercial paper borrowings $ 59 $ 45
Weighted-average interest rate 2.27%  
Debt instrument maturity less than 90 days