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Derivative and Hedging Instruments - Summary of Gross Notional Amount and Fair Value of Derivative Instruments (Detail) - CAD ($)
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about hedges [Line Items]    
Notional amount $ 395,957,000,000 $ 440,098,000,000
Fair value, assets 8,588,000,000 17,503,000,000
Fair value, liabilities 14,289,000,000 10,038,000,000
Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 5,919,000,000 14,971,000,000
Fair value, liabilities 12,025,000,000 7,829,000,000
Equity contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 366,000,000 1,677,000,000
Fair value, liabilities 225,000,000 27,000,000
Credit default swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 4,000,000 1,000,000
Designated [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 2,002,000,000 2,124,000,000
Designated [Member] | Fair value hedges [Member] | Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 48,000,000 57,000,000
Designated [Member] | Cash flow hedges [Member] | Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 1,155,000,000 1,251,000,000
Designated [Member] | Cash flow hedges [Member] | Equity contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 173,000,000 145,000,000
Designated [Member] | Hedges of net investment in foreign operations [Member] | Foreign Currency Forwards [member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 626,000,000 671,000,000
Non designated [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 393,955,000,000 437,974,000,000
Non designated [Member] | Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 268,081,000,000 300,556,000,000
Non designated [Member] | Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 39,667,000,000 36,405,000,000
Non designated [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 45,124,000,000 45,295,000,000
Non designated [Member] | Equity contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 16,930,000,000 18,577,000,000
Non designated [Member] | Interest rate futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 11,772,000,000 11,944,000,000
Non designated [Member] | Interest rate options [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 6,090,000,000 10,708,000,000
Non designated [Member] | Currency rate futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 2,319,000,000 3,086,000,000
Non designated [Member] | Credit default swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 159,000,000 44,000,000
Non designated [Member] | Equity futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount 3,813,000,000 11,359,000,000
Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 8,588,000,000 17,503,000,000
Fair value, liabilities (14,289,000,000) (10,038,000,000)
Fair value [Member] | Designated [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 48,000,000 25,000,000
Fair value, liabilities 231,000,000 380,000,000
Fair value [Member] | Designated [Member] | Fair value hedges [Member] | Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 5,000,000 1,000,000
Fair value, liabilities   1,000,000
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 40,000,000 5,000,000
Fair value, liabilities 203,000,000 379,000,000
Fair value [Member] | Designated [Member] | Cash flow hedges [Member] | Equity contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 3,000,000 10,000,000
Fair value [Member] | Designated [Member] | Hedges of net investment in foreign operations [Member] | Foreign Currency Forwards [member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets   9,000,000
Fair value, liabilities 28,000,000 0
Fair value [Member] | Non designated [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 8,540,000,000 17,478,000,000
Fair value, liabilities 14,058,000,000 9,658,000,000
Fair value [Member] | Non designated [Member] | Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 5,751,000,000 11,832,000,000
Fair value, liabilities 7,557,000,000 7,347,000,000
Fair value [Member] | Non designated [Member] | Foreign currency swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 2,029,000,000 790,000,000
Fair value, liabilities 1,579,000,000 1,722,000,000
Fair value [Member] | Non designated [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 295,000,000 2,674,000,000
Fair value, liabilities 4,697,000,000 562,000,000
Fair value [Member] | Non designated [Member] | Equity contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 363,000,000 1,667,000,000
Fair value, liabilities 225,000,000 27,000,000
Fair value [Member] | Non designated [Member] | Interest rate options [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets 98,000,000 514,000,000
Fair value [Member] | Non designated [Member] | Credit default swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, assets $ 4,000,000 $ 1,000,000