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Debt Narrative (Details)
CAD in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
credit_facility
program
Oct. 19, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CAD
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]          
Short-term debt and current portion of long-term debt $ 305,000,000       $ 336,000,000
Number of credit facilities | credit_facility 1        
Number of commercial paper programs | program 2        
4.76% Senior Notes Due March 2018 | Senior Notes          
Debt Instrument [Line Items]          
Short-term debt and current portion of long-term debt $ 304,000,000     CAD 375  
Debt interest rate percentage (as a percent) 4.76%        
Credit Facility Expiring February 2021          
Debt Instrument [Line Items]          
Borrowings $ 0        
Foreign Line of Credit | 2020 Facility | Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 900,000,000        
Credit Facility Expiring March 2017 | Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity     $ 400,000,000    
Commercial paper | Commercial Paper Programs          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 1,300,000,000        
Line of credit facility, current borrowing capacity $ 900,000,000        
Subsequent Event | Credit Facility Expiring October 2022 | Line of Credit          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 400,000,000