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Maturity Of Lease Liabilities (Detail)
$ in Millions
Dec. 31, 2020
CAD ($)
Operating Lease  
2021 $ 96
2022 49
2023 16
2024 12
2025 3
2026 and beyond 27
Total lease payments 203
Discount to present value (11)
Total lease liability $ 192
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseLiability
Finance Lease  
2021 $ 53
2022 52
2023 51
2024 50
2025 47
2026 and beyond 1,040
Total lease payments 1,293
Discount to present value (767)
Total lease liability $ 526