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Risk Management - Summary of Macroeconoic Variables Used to Measure Allowance for Credit Losses (Detail)
$ in Billions
 12 Months Ended
Dec. 31, 2023
CAD ($)
$ / Oil_Price
Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product | $ $ 1,448
Unemployment rate 5.80%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 85.7
U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product | $ $ 22,531
Unemployment rate 3.90%
Corporate Index,Percentage 6.60%
Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product | $ $ 559,492
Unemployment rate 2.70%
Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 2.80%
Share Index 19,316
China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product | $ $ 108,251
Share Index 9,852
Ensuing 4 years [member] | Base case scenario [member] | Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 5.80%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 71.4
Gross Domestic Product, Percentage 2.00%
Ensuing 4 years [member] | Base case scenario [member] | U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 4.00%
Corporate Index,Percentage 6.00%
Gross Domestic Product, Percentage 2.30%
Ensuing 4 years [member] | Base case scenario [member] | Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 2.40%
Gross Domestic Product, Percentage 0.80%
Ensuing 4 years [member] | Base case scenario [member] | Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 3.20%
Share Index, Percentage 5.10%
Ensuing 4 years [member] | Base case scenario [member] | China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product, Percentage 4.30%
Share Index, Percentage 5.00%
Ensuing 4 years [member] | Upside scenario [member] | Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 4.90%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 71.7
Gross Domestic Product, Percentage 2.30%
Ensuing 4 years [member] | Upside scenario [member] | U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 3.30%
Corporate Index,Percentage 6.10%
Gross Domestic Product, Percentage 2.40%
Ensuing 4 years [member] | Upside scenario [member] | Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 2.20%
Gross Domestic Product, Percentage 1.00%
Ensuing 4 years [member] | Upside scenario [member] | Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 2.80%
Share Index, Percentage 4.70%
Ensuing 4 years [member] | Upside scenario [member] | China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product, Percentage 4.40%
Share Index, Percentage 3.00%
Ensuing 4 years [member] | Downside scenario 2 [member] | Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 9.30%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 58.6
Gross Domestic Product, Percentage 2.10%
Ensuing 4 years [member] | Downside scenario 2 [member] | U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 7.60%
Corporate Index,Percentage 5.30%
Gross Domestic Product, Percentage 2.50%
Ensuing 4 years [member] | Downside scenario 2 [member] | Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 3.70%
Gross Domestic Product, Percentage 1.70%
Ensuing 4 years [member] | Downside scenario 2 [member] | Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 4.80%
Share Index, Percentage 14.80%
Ensuing 4 years [member] | Downside scenario 2 [member] | China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product, Percentage 3.90%
Share Index, Percentage 13.40%
Ensuing 4 years [member] | Downside scenario 1 [member] | Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 7.70%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 64.8
Gross Domestic Product, Percentage 2.20%
Ensuing 4 years [member] | Downside scenario 1 [member] | U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 5.80%
Corporate Index,Percentage 5.40%
Gross Domestic Product, Percentage 2.60%
Ensuing 4 years [member] | Downside scenario 1 [member] | Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 3.10%
Gross Domestic Product, Percentage 1.10%
Ensuing 4 years [member] | Downside scenario 1 [member] | Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 4.00%
Share Index, Percentage 11.30%
Ensuing 4 years [member] | Downside scenario 1 [member] | China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product, Percentage 4.60%
Share Index, Percentage 11.90%
Next 12 months [member] | Base case scenario [member] | Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 6.00%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 82.8
Gross Domestic Product, Percentage 1.60%
Next 12 months [member] | Base case scenario [member] | U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 3.90%
Corporate Index,Percentage 6.50%
Gross Domestic Product, Percentage 1.30%
Next 12 months [member] | Base case scenario [member] | Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 2.70%
Gross Domestic Product, Percentage 0.40%
Next 12 months [member] | Base case scenario [member] | Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 2.90%
Share Index, Percentage 20.90%
Next 12 months [member] | Base case scenario [member] | China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product, Percentage 6.00%
Share Index, Percentage 7.30%
Next 12 months [member] | Upside scenario [member] | Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 5.30%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 85.3
Gross Domestic Product, Percentage 3.60%
Next 12 months [member] | Upside scenario [member] | U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 3.20%
Corporate Index,Percentage 6.20%
Gross Domestic Product, Percentage 3.60%
Next 12 months [member] | Upside scenario [member] | Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 2.60%
Gross Domestic Product, Percentage 2.50%
Next 12 months [member] | Upside scenario [member] | Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 2.60%
Share Index, Percentage 35.40%
Next 12 months [member] | Upside scenario [member] | China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product, Percentage 9.50%
Share Index, Percentage 26.60%
Next 12 months [member] | Downside scenario 2 [member] | Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 9.20%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 58.9
Gross Domestic Product, Percentage (4.10%)
Next 12 months [member] | Downside scenario 2 [member] | U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 6.90%
Corporate Index,Percentage 6.60%
Gross Domestic Product, Percentage (4.20%)
Next 12 months [member] | Downside scenario 2 [member] | Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 3.30%
Gross Domestic Product, Percentage (8.30%)
Next 12 months [member] | Downside scenario 2 [member] | Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 4.40%
Share Index, Percentage (34.10%)
Next 12 months [member] | Downside scenario 2 [member] | China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product, Percentage (4.70%)
Share Index, Percentage (42.00%)
Next 12 months [member] | Downside scenario 1 [member] | Canada [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 7.90%
NYMEX Light Sweet Crude Oil (in U.S. dollars, per barrel) 68
Gross Domestic Product, Percentage (2.10%)
Next 12 months [member] | Downside scenario 1 [member] | U.S. [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 6.50%
Corporate Index,Percentage 6.00%
Gross Domestic Product, Percentage (2.50%)
Next 12 months [member] | Downside scenario 1 [member] | Japan [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 3.20%
Gross Domestic Product, Percentage (4.60%)
Next 12 months [member] | Downside scenario 1 [member] | Hong Kong [member]  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Unemployment rate 4.00%
Share Index, Percentage (13.60%)
Next 12 months [member] | Downside scenario 1 [member] | China [member  
Disclosure In Tabular Form Of Macroeconoic Variables Used To Measure Allowance For Credit Losses [Line Items]  
Gross Domestic Product, Percentage (1.20%)
Share Index, Percentage (31.40%)