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Derivative and Hedging Instruments - Summary of Fair Values of Derivative Instruments by Remaining Term to Maturity (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about hedges [Line Items]    
Derivative assets $ 8,588,000,000 $ 17,503,000,000
Derivative liabilities 14,289,000,000 10,038,000,000
Remaining term to maturity (notional amounts) 395,957,000,000 440,098,000,000
Credit equivalent amount 2,002,000,000 4,176,000,000
Capital Requirement 38,000,000 76,000,000
Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 8,588,000,000 17,503,000,000
Derivative liabilities (14,289,000,000) (10,038,000,000)
Fair value, net (5,701,000,000) 7,465,000,000
Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 314,357,000,000 354,376,000,000
Credit equivalent amount 491,000,000 1,994,000,000
Capital Requirement 13,000,000 43,000,000
Interest rate swaps [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 6,414,000,000 15,693,000,000
Derivative liabilities   (8,653,000,000)
Fair value, net (6,408,000,000) 7,040,000,000
Interest rate swaps [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 126,450,000,000 117,030,000,000
Credit equivalent amount 419,000,000 1,582,000,000
Capital Requirement 9,000,000 29,000,000
Interest rate swaps [Member] | OTC swap contracts [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 5,992,000,000 12,112,000,000
Derivative liabilities (8,135,000,000) (7,717,000,000)
Fair value, net (2,143,000,000) 4,395,000,000
Interest rate swaps [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 141,631,000,000 183,526,000,000
Interest rate swaps [Member] | Cleared swap contracts [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 254,000,000 441,000,000
Derivative liabilities (219,000,000) (453,000,000)
Fair value, net 35,000,000 (12,000,000)
Interest rate swaps [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 28,414,000,000 31,168,000,000
Credit equivalent amount 8,000,000 299,000,000
Capital Requirement   5,000,000
Interest rate swaps [Member] | Forward contracts [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 70,000,000 2,625,000,000
Derivative liabilities (4,468,000,000) (483,000,000)
Fair value, net (4,398,000,000) 2,142,000,000
Interest rate swaps [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 11,772,000,000 11,944,000,000
Interest rate swaps [Member] | Futures [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, net 0  
Interest rate swaps [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 6,090,000,000 10,708,000,000
Credit equivalent amount 64,000,000 113,000,000
Capital Requirement 4,000,000 9,000,000
Interest rate swaps [Member] | Options purchased [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 98,000,000 515,000,000
Fair value, net 98,000,000 515,000,000
Foreign exchange [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 17,336,000,000 14,798,000,000
Credit equivalent amount 89,000,000 85,000,000
Foreign exchange [Member] | Forward contracts [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 226,000,000 58,000,000
Derivative liabilities (258,000,000) (79,000,000)
Fair value, net (32,000,000) (21,000,000)
Foreign exchange [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 2,319,000,000 3,086,000,000
Foreign exchange [Member] | Futures [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Fair value, net 0  
Foreign exchange [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 40,870,000,000 37,713,000,000
Credit equivalent amount 1,166,000,000 1,302,000,000
Capital Requirement 23,000,000 25,000,000
Foreign exchange [Member] | Swap contracts [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 2,067,000,000 801,000,000
Derivative liabilities (1,846,000,000) (2,181,000,000)
Fair value, net 221,000,000 (1,380,000,000)
Credit derivatives [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 159,000,000 44,000,000
Credit derivatives [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 4,000,000 1,000,000
Fair value, net 4,000,000 1,000,000
Equity contracts [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,813,000,000 11,359,000,000
Equity contracts [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 16,160,000,000 17,730,000,000
Credit equivalent amount 232,000,000 766,000,000
Capital Requirement 2,000,000 8,000,000
Equity contracts [Member] | Options purchased [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 335,000,000 1,616,000,000
Derivative liabilities (218,000,000) (17,000,000)
Fair value, net 117,000,000 1,599,000,000
Equity contracts [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 943,000,000 992,000,000
Credit equivalent amount 24,000,000 29,000,000
Equity contracts [Member] | Swap contracts [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 26,000,000 57,000,000
Derivative liabilities (7,000,000) (10,000,000)
Fair value, net 19,000,000 47,000,000
Financial Instruments [member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 395,957,000,000 440,098,000,000
Credit equivalent amount 2,002,000,000 4,176,000,000
Capital Requirement 38,000,000 76,000,000
Financial Instruments [member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 9,072,000,000 18,226,000,000
Derivative liabilities (15,151,000,000) (10,940,000,000)
Fair value, net (6,079,000,000) 7,286,000,000
Accrued interest [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 484,000,000 723,000,000
Derivative liabilities (862,000,000) (902,000,000)
Fair value, net (378,000,000) (179,000,000)
Less than 1 year [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 580,000,000 2,500,000,000
Derivative liabilities 2,656,000,000 294,000,000
Remaining term to maturity (notional amounts) 77,262,000,000 97,100,000,000
Less than 1 year [Member] | Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 38,572,000,000 54,262,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 8,817,000,000 4,554,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 2,494,000,000 21,722,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 14,290,000,000 14,636,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 11,772,000,000 11,944,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 1,199,000,000 1,406,000,000
Less than 1 year [Member] | Foreign exchange [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 17,336,000,000 14,798,000,000
Less than 1 year [Member] | Foreign exchange [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 2,319,000,000 3,086,000,000
Less than 1 year [Member] | Foreign exchange [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 2,026,000,000 1,941,000,000
Less than 1 year [Member] | Credit derivatives [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 15,000,000 11,000,000
Less than 1 year [Member] | Equity contracts [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,813,000,000 11,359,000,000
Less than 1 year [Member] | Equity contracts [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 12,634,000,000 10,974,000,000
Less than 1 year [Member] | Equity contracts [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 547,000,000 669,000,000
Less than 1 year [Member] | Financial Instruments [member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 77,262,000,000 97,100,000,000
1 to 3 years [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 556,000,000 1,803,000,000
Derivative liabilities 1,956,000,000 387,000,000
3 to 5 years [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 556,000,000 1,000,000,000
Derivative liabilities 1,146,000,000 379,000,000
1 to 5 years [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 65,612,000,000 84,070,000,000
1 to 5 years [Member] | Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 51,071,000,000 68,129,000,000
1 to 5 years [Member] | Interest rate swaps [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 19,253,000,000 21,884,000,000
1 to 5 years [Member] | Interest rate swaps [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 16,823,000,000 27,665,000,000
1 to 5 years [Member] | Interest rate swaps [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 13,926,000,000 15,791,000,000
1 to 5 years [Member] | Interest rate swaps [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 1,069,000,000 2,789,000,000
1 to 5 years [Member] | Foreign exchange [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts)   0
1 to 5 years [Member] | Foreign exchange [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 10,475,000,000 8,869,000,000
1 to 5 years [Member] | Credit derivatives [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 144,000,000 33,000,000
1 to 5 years [Member] | Equity contracts [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,526,000,000 6,716,000,000
1 to 5 years [Member] | Equity contracts [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 396,000,000 323,000,000
1 to 5 years [Member] | Financial Instruments [member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 65,612,000,000 84,070,000,000
Over 5 years [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 6,896,000,000 12,200,000,000
Derivative liabilities 8,531,000,000 8,978,000,000
Remaining term to maturity (notional amounts) 253,083,000,000 258,928,000,000
Over 5 years [Member] | Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 224,714,000,000 231,985,000,000
Over 5 years [Member] | Interest rate swaps [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 98,380,000,000 90,592,000,000
Over 5 years [Member] | Interest rate swaps [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 122,314,000,000 134,139,000,000
Over 5 years [Member] | Interest rate swaps [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 198,000,000 741,000,000
Over 5 years [Member] | Interest rate swaps [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,822,000,000 6,513,000,000
Over 5 years [Member] | Foreign exchange [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 28,369,000,000 26,903,000,000
Over 5 years [Member] | Equity contracts [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts)   40,000,000
Over 5 years [Member] | Financial Instruments [member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) $ 253,083,000,000 $ 258,928,000,000