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related party transactions (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
CAD ($)
EquityInstruments
Dec. 31, 2017
CAD ($)
EquityInstruments
Transactions with defined benefit pension plans    
Charges for management and administrative services to our defined benefit pension plans $ 6 $ 6
Key management personnel    
Transactions with key management personnel    
Short-term benefits 12 12
Post-employment pension and other benefits 8 4
Share-based compensation 44 34
Total 64 50
Effect on share-based compensation expense of derivatives used to manage costs 0 4
Liability amounts accrued for share-based compensation awards to key management personnel    
Restricted stock units 41 40
Deferred share units 21 24
Total $ 62 $ 64
Annual cash bonus as a percentage of base salary upon termination without cause 50.00%  
Minimum | Key management personnel    
Liability amounts accrued for share-based compensation awards to key management personnel    
Number of months base salary considered for severance payments 18 months  
Maximum | Key management personnel    
Liability amounts accrued for share-based compensation awards to key management personnel    
Number of months base salary considered for severance payments 24 months  
Restricted stock units | Key management personnel    
Transactions with key management personnel    
Number of units awarded in period (in shares) | EquityInstruments 608,849 686,595
Notional value of units awarded in period $ 28 $ 30
Grant-date fair value of units awarded in period 36 30
Directors' Deferred Share Unit Plan | Key management personnel    
Liability amounts accrued for share-based compensation awards to key management personnel    
Deferred share units paid out $ 6 $ 14