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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance $ 2,228 $ 2,602
Disposals (9)  
Recognized in Income Statement (127) 280
Recognized in Other Comprehensive Income 61 (87)
Recognized in Equity 15 25
Translation and Other 63 (32)
Ending balance 2,485 2,228
Loss carryforwards [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 497 705
Disposals (10)  
Recognized in Income Statement 22 (210)
Translation and Other 8 2
Ending balance 517 497
Actuarial liabilities [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 9,372 8,443
Recognized in Income Statement (666) 1,063
Translation and Other (3) (134)
Ending balance 8,703 9,372
Pensions and post-employment benefits [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 215 226
Recognized in Income Statement 7  
Recognized in Other Comprehensive Income (61) (10)
Translation and Other   (1)
Ending balance 161 215
Tax credits [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance 34 32
Recognized in Income Statement 11 2
Recognized in Other Comprehensive Income 1  
Ending balance 46 34
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 (1,033) (1,046)
Recognized in Income Statement (145) 5
Recognized in Other Comprehensive Income   (2)
Recognized in Equity   1
Translation and Other 7 9
Ending balance (1,171) (1,033)
Securities and other investments [member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance (5,950) (4,704)
Recognized in Income Statement 643 (1,254)
Recognized in Other Comprehensive Income 119 (59)
Recognized in Equity   2
Translation and Other 49 65
Ending balance (5,139) (5,950)
Sale of investments [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance (56) (69)
Recognized in Income Statement 16 13
Ending balance (40) (56)
Goodwill and intangible assets [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance (849) (876)
Recognized in Income Statement 29 24
Translation and Other 16 3
Ending balance (804) (849)
Other [Member]    
Reconciliation of changes in deferred tax liability (asset) [line items]    
Beginning balance (3) (110)
Disposals 1  
Recognized in Income Statement 210 77
Recognized in Other Comprehensive Income 2 (16)
Recognized in Equity 15 22
Translation and Other (14) 24
Ending balance $ 211 $ (3)