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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance $ 2,485 $ 2,228
Disposals   (9)
Recognized in Income Statement (731) 127
Recognized in Other Comprehensive Income 863 61
Recognized in Equity 8 15
Translation and Other 24 63
Ending balance 2,649 2,485
Loss carryforwards [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 517 497
Disposals   (10)
Recognized in Income Statement 184 22
Translation and Other   8
Ending balance 701 517
Actuarial liabilities [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 8,703 9,372
Recognized in Income Statement (5,537) (666)
Recognized in Equity 1  
Translation and Other 374 (3)
Ending balance 3,541 8,703
Pensions and post-employment benefits [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 161 215
Recognized in Income Statement (1) 7
Recognized in Other Comprehensive Income (17) (61)
Ending balance 143 161
Tax credits [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 46 34
Recognized in Income Statement 63 11
Recognized in Other Comprehensive Income   1
Ending balance 109 46
Accrued interest [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 1 1
Ending balance 1 1
Real estate [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance (1,171) (1,033)
Recognized in Income Statement (20) (145)
Recognized in Other Comprehensive Income (1)  
Translation and Other (36) 7
Ending balance (1,228) (1,171)
Securities and other investments [member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance (5,139) (5,950)
Recognized in Income Statement 4,552 643
Recognized in Other Comprehensive Income 879 119
Recognized in Equity (1)  
Translation and Other (250) 49
Ending balance 41 (5,139)
Sale of investments [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance (40) (56)
Recognized in Income Statement 10 16
Ending balance (30) (40)
Goodwill and intangible assets [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance (804) (849)
Recognized in Income Statement (4) 29
Translation and Other (17) 16
Ending balance (825) (804)
Other [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 211 (3)
Disposals   1
Recognized in Income Statement 22 210
Recognized in Other Comprehensive Income 2 2
Recognized in Equity 8 15
Translation and Other (47) (14)
Ending balance $ 196 $ 211