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Contingent Payment - Summary of Contingent Payment (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of contingent liabilities in business combination [abstract]    
Contingent liabilities recognised in business combination at beginning of period $ 63 $ 143
Re-measurement 575 (80)
Liabilities Settled or Payable (402) 0
Contingent liabilities recognised in business combination at end of period $ 236 $ 63