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Adoption of New IFRS Pronouncements - Summary of Adjustments to Condensed Consolidated Statements of Income (Detail) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of retrospective adjustments of financial statements [line items] |  |
Revenues | $ 12,564 | $ 11,910
Cost of sales | (7,943) | (7,343)
Provision for income taxes | (1,365) | (1,425)
Profit for the year | 3,145 | 2,489
Profit for the year after accounting changes attributable to: |  |
Shareholders of the company | 3,107 | 2,460
Non-controlling interests | $ 38 | $ 29
Earnings per share after accounting changes |  |
Basic | $ 5.41 | $ 4.26
Diluted | $ 5.34 | $ 4.19
Previously stated [member] |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |
Profit for the year |  | $ 2,538
Increase (decrease) due to application of IFRS 15 [member] |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |
Revenues |  | (138)
Cost of sales |  | 76
Provision for income taxes |  | 13
Profit for the year |  | $ (49)

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