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Adoption of New IFRS Pronouncements - Summary of Adjustments to Condensed Consolidated Statements of Comprehensive Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of retrospective adjustments of financial statements [line items] |  |
Comprehensive income | $ 3,537 | $ 2,404
Profit | 3,145 | 2,489
Total comprehensive income after accounting changes attributable to: |  |
Shareholders of the company | 3,489 | 2,383
Non-controlling interests | 48 | 21
Comprehensive income | $ 3,537 | 2,404
Previously stated [member] |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |
Comprehensive income |  | 2,501
Profit |  | 2,538
Total comprehensive income after accounting changes attributable to: |  |
Comprehensive income |  | 2,501
Increase (decrease) due to application of IFRS 15 [member] |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |
Profit |  | (49)
Other comprehensive income: |  |
Currency translation differences |  | $ (48)

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