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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

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