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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).

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