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Adoption of New IFRS Pronouncements - Summary of Adjustments to Condensed Consolidated Balance Sheets (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Disclosure of retrospective adjustments of financial statements [line items] |  |  |
Equity | $ 23,018 | $ 19,993 | $ 18,166
Equity after accounting changes attributable to: |  |  |
Shareholders of the company | 22,884 | 19,851 | 18,007
Non-controllinginterests | $ 134 | 142 | 159
Previously stated [member] |  |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |  |
Equity |  | 19,525 | 17,601
Increase (decrease) due to application of IFRS 15 [member] | Trade and settlement receivables [member] |  |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |  |
Equity |  | (61) |
Increase (decrease) due to application of IFRS 15 [member] | Inventories [member] |  |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |  |
Equity |  | 32 |
Increase (decrease) due to application of IFRS 15 [member] | Current portion of deferred consideration [member] |  |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |  |
Equity |  | 23 | 32
Increase (decrease) due to application of IFRS 15 [member] | Current income taxes payable [member] |  |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |  |
Equity |  | 5 |
Increase (decrease) due to application of IFRS 15 [member] | Deferred consideration [member] |  |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |  |
Equity |  | 651 | 723
Increase (decrease) due to application of IFRS 15 [member] | Deferred income tax liabilities [member] |  |  |
Disclosure of retrospective adjustments of financial statements [line items] |  |  |
Equity |  | $ (182) | $ (190)

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