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Amounts Recorded in Consolidated Balance Sheet and Accumulated Other Comprehensive Income (Detail) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Defined Benefit Plans Disclosures [Line Items]    
Current liabilities $ (58) $ (55)
Other long-term obligations [1] (1,822) (1,195)
Pension benefits    
Schedule Of Defined Benefit Plans Disclosures [Line Items]    
Current liabilities (27) (27)
Other long-term obligations (1,160) (641)
Total recorded (1,187) (668)
Net actuarial loss (gain) 2,256 2,117
Prior service cost 283  
Total recorded in accumulated other comprehensive income, before tax 2,539 2,117
Other postretirement benefits    
Schedule Of Defined Benefit Plans Disclosures [Line Items]    
Current liabilities (31) (28)
Other long-term obligations (662) (554)
Total recorded (693) (582)
Net actuarial loss (gain) 133 33
Total recorded in accumulated other comprehensive income, before tax $ 133 $ 33
[1] Total recorded employee retirement benefits obligations also included $58 million in current liabilities (2018 – $55 million).