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Adoption of New IFRS Pronouncements - Additional Information (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 CAD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
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Adoption Of New IFRS Pronouncements [Line Items] |  |  |  |  |
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 |  | 4.97% | 4.97% |  |
Right-of-use assets | $ 762 |  | $ 280 | $ 504 |
IFRS 16 adoption (Note 33(a)) | 672 |  | 680 | 338 |
Lease liabilities from finance leases previously recorded in debt |  |  | 338 | 338 |
Equity | 22,074 |  |  | 23,018 |
Retained earnings |  |  |  |  |
Adoption Of New IFRS Pronouncements [Line Items] |  |  |  |  |
Equity | $ 14,447 |  |  | $ 15,495 | $ 12,796
IFRS 16 |  |  |  |  |
Adoption Of New IFRS Pronouncements [Line Items] |  |  |  |  |
IFRS 16 adoption (Note 33(a)) |  |  | $ 342 |  |
IFRS 16 | Retained earnings |  |  |  |  |
Adoption Of New IFRS Pronouncements [Line Items] |  |  |  |  |
Equity |  | $ 43 |  |  |

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