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Loans, Impaired Loans and Allowance for Credit Losses - Summary of Key Macroeconomic Variables Used for Allowance for Credit Losses Calculations (Detail)
 3 Months Ended
Apr. 30, 2022
$ / bbl
$ / lb
Jan. 31, 2022
$ / bbl
$ / lb
Oct. 31, 2021
$ / bbl
$ / lb
Base case scenario [member] | Canada [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.60% 4.20% 3.40%
Unemployment rate, average % 5.00% 5.20% 6.30%
Bank of Canada overnight rate target, average % 2.20% 0.90% 0.30%
HPI - Housing Price Index, y/y % change 16.60% 9.90% 11.10%
USD/CAD exchange rate, average 1.21 1.21 1.24
Base case scenario [member] | Canada [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.00% 1.60% 1.90%
Unemployment rate, average % 6.10% 5.50% 5.70%
Bank of Canada overnight rate target, average % 2.40% 2.40% 2.00%
HPI - Housing Price Index, y/y % change (0.70%) 1.90% 2.10%
USD/CAD exchange rate, average 1.23 1.2 1.21
Base case scenario [member] | United States [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.90% 4.20% 5.70%
Unemployment rate, average % 3.80% 4.10% 3.80%
Base case scenario [member] | United States [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 1.90% 1.90% 1.60%
Unemployment rate, average % 4.20% 4.20% 3.50%
Base case scenario [member] | Mexico [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 1.70% 2.80% 2.80%
Unemployment rate, average % 4.00% 4.00% 4.00%
Base case scenario [member] | Mexico [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 1.80% 1.90% 1.90%
Unemployment rate, average % 3.90% 3.80% 4.00%
Base case scenario [member] | Chile [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 1.80% 4.60% 6.70%
Unemployment rate, average % 6.20% 6.60% 6.50%
Base case scenario [member] | Chile [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.10% 3.00% 2.20%
Unemployment rate, average % 5.90% 6.30% 6.20%
Base case scenario [member] | Peru [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.60% 2.60% 5.00%
Unemployment rate, average % 7.80% 8.70% 8.80%
Base case scenario [member] | Peru [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.00% 3.00% 3.20%
Unemployment rate, average % 7.00% 7.40% 7.50%
Base case scenario [member] | Colombia [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.30% 4.50% 5.00%
Unemployment rate, average % 10.80% 10.80% 13.70%
Base case scenario [member] | Colombia [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.50% 3.50% 3.50%
Unemployment rate, average % 10.30% 10.40% 11.20%
Base case scenario [member] | Caribbean [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.60% 4.80% 4.90%
Base case scenario [member] | Caribbean [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.00% 4.00% 4.10%
Base case scenario [member] | Global WTI oil price [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / bbl 96 69 69
Base case scenario [member] | Global WTI oil price [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / bbl 77 71 70
Base case scenario [member] | Global Copper price [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / lb 4.18 4.25 4.2
Base case scenario [member] | Global Copper price [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / lb 4.2 4.15 4.2
Base case scenario [member] | Global GDP and PPP [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Global GDP, PPP-weighted, y/y % change 3.91% 4.32% 5.07%
Base case scenario [member] | Global GDP and PPP [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Global GDP, PPP-weighted, y/y % change 2.72% 3.57% 3.02%
Optimistic scenario [member] | Canada [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 6.60% 6.10% 5.30%
Unemployment rate, average % 4.20% 4.50% 5.60%
Bank of Canada overnight rate target, average % 2.80% 1.50% 0.90%
HPI - Housing Price Index, y/y % change 19.50% 12.50% 13.20%
USD/CAD exchange rate, average 1.2 1.2 1.23
Optimistic scenario [member] | Canada [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.90% 2.50% 2.80%
Unemployment rate, average % 4.50% 4.00% 4.10%
Bank of Canada overnight rate target, average % 3.40% 3.70% 3.60%
HPI - Housing Price Index, y/y % change 0.90% 3.10% 3.90%
USD/CAD exchange rate, average 1.22 1.19 1.2
Optimistic scenario [member] | United States [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 5.30% 5.40% 7.30%
Unemployment rate, average % 3.50% 3.90% 3.40%
Optimistic scenario [member] | United States [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.60% 2.60% 2.10%
Unemployment rate, average % 3.80% 3.80% 3.20%
Optimistic scenario [member] | Mexico [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.90% 4.40% 4.30%
Unemployment rate, average % 3.60% 3.40% 3.60%
Optimistic scenario [member] | Mexico [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.50% 2.00% 2.70%
Unemployment rate, average % 3.00% 3.20% 3.10%
Optimistic scenario [member] | Chile [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.60% 6.80% 8.80%
Unemployment rate, average % 5.70% 6.00% 5.90%
Optimistic scenario [member] | Chile [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.50% 4.00% 3.10%
Unemployment rate, average % 5.20% 5.50% 5.60%
Optimistic scenario [member] | Peru [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.50% 4.50% 7.70%
Unemployment rate, average % 6.90% 5.80% 6.00%
Optimistic scenario [member] | Peru [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.70% 3.80% 4.30%
Unemployment rate, average % 4.20% 5.10% 3.40%
Optimistic scenario [member] | Colombia [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 5.80% 6.50% 6.80%
Unemployment rate, average % 10.10% 10.00% 12.00%
Optimistic scenario [member] | Colombia [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 5.10% 4.80% 4.80%
Unemployment rate, average % 7.90% 7.70% 8.20%
Optimistic scenario [member] | Caribbean [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 5.70% 6.40% 6.20%
Optimistic scenario [member] | Caribbean [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.80% 4.10% 4.90%
Optimistic scenario [member] | Global WTI oil price [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / bbl 102 75 75
Optimistic scenario [member] | Global WTI oil price [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / bbl 95 87 86
Optimistic scenario [member] | Global Copper price [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / lb 4.33 4.46 4.36
Optimistic scenario [member] | Global Copper price [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / lb 4.75 4.72 4.78
Optimistic scenario [member] | Global GDP and PPP [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Global GDP, PPP-weighted, y/y % change 5.27% 5.66% 6.54%
Optimistic scenario [member] | Global GDP and PPP [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Global GDP, PPP-weighted, y/y % change 3.61% 4.47% 3.90%
Pessimistic scenario [member] | Canada [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (0.80%) 0.00% (1.30%)
Unemployment rate, average % 9.10% 7.70% 8.80%
Bank of Canada overnight rate target, average % 3.50% 0.30% 0.30%
HPI - Housing Price Index, y/y % change 11.40% 3.00% 3.90%
USD/CAD exchange rate, average 1.21 1.25 1.28
Pessimistic scenario [member] | Canada [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.80% 2.70% 3.10%
Unemployment rate, average % 6.90% 6.10% 6.30%
Bank of Canada overnight rate target, average % 3.00% 1.90% 1.20%
HPI - Housing Price Index, y/y % change 0.50% 3.10% 3.30%
USD/CAD exchange rate, average 1.22 1.2 1.21
Pessimistic scenario [member] | United States [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (1.90%) 1.20% 2.40%
Unemployment rate, average % 7.40% 5.80% 5.60%
Pessimistic scenario [member] | United States [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.60% 2.70% 2.40%
Unemployment rate, average % 4.80% 4.80% 4.10%
Pessimistic scenario [member] | Mexico [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (3.70%) 0.00% (0.40%)
Unemployment rate, average % 7.40% 6.50% 6.50%
Pessimistic scenario [member] | Mexico [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.20% 2.50% 2.70%
Unemployment rate, average % 4.90% 4.30% 4.50%
Pessimistic scenario [member] | Chile [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (3.20%) 2.00% 3.40%
Unemployment rate, average % 9.90% 9.10% 9.00%
Pessimistic scenario [member] | Chile [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.60% 3.40% 3.10%
Unemployment rate, average % 6.40% 6.90% 6.70%
Pessimistic scenario [member] | Peru [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (1.20%) (0.60%) 3.60%
Unemployment rate, average % 10.50% 11.20% 10.80%
Pessimistic scenario [member] | Peru [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.10% 3.80% 3.70%
Unemployment rate, average % 8.00% 8.00% 8.10%
Pessimistic scenario [member] | Colombia [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 0.50% 1.20% 3.60%
Unemployment rate, average % 13.30% 13.30% 15.60%
Pessimistic scenario [member] | Colombia [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 4.70% 4.40% 4.00%
Unemployment rate, average % 11.20% 10.90% 11.80%
Pessimistic scenario [member] | Caribbean [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 0.80% 2.00% 3.90%
Pessimistic scenario [member] | Caribbean [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 5.20% 4.60% 4.60%
Pessimistic scenario [member] | Global WTI oil price [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / bbl 129 59 61
Pessimistic scenario [member] | Global WTI oil price [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / bbl 81 66 67
Pessimistic scenario [member] | Global Copper price [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / lb 4.63 3.95 3.93
Pessimistic scenario [member] | Global Copper price [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / lb 4.23 3.89 4.05
Pessimistic scenario [member] | Global GDP and PPP [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Global GDP, PPP-weighted, y/y % change (1.35%) 1.96% 2.44%
Pessimistic scenario [member] | Global GDP and PPP [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Global GDP, PPP-weighted, y/y % change 4.27% 4.17% 3.68%
Severe Pessimistic [Member] | Canada [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (2.20%) (4.60%) (7.40%)
Unemployment rate, average % 9.60% 10.60% 11.70%
Bank of Canada overnight rate target, average % 3.50% 0.30% 0.30%
HPI - Housing Price Index, y/y % change 9.80% (3.50%) (2.70%)
USD/CAD exchange rate, average 1.21 1.27 1.3
Severe Pessimistic [Member] | Canada [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.70% 3.50% 4.30%
Unemployment rate, average % 8.50% 8.00% 8.20%
Bank of Canada overnight rate target, average % 3.40% 1.20% 0.50%
HPI - Housing Price Index, y/y % change (0.50%) 3.70% 3.90%
USD/CAD exchange rate, average 1.22 1.23 1.24
Severe Pessimistic [Member] | United States [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (3.50%) (2.20%) (1.40%)
Unemployment rate, average % 7.80% 7.10% 6.80%
Severe Pessimistic [Member] | United States [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.90% 3.60% 3.50%
Unemployment rate, average % 6.20% 6.20% 5.60%
Severe Pessimistic [Member] | Mexico [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (4.70%) (2.60%) (4.20%)
Unemployment rate, average % 7.70% 9.40% 9.40%
Severe Pessimistic [Member] | Mexico [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 1.80% 2.80% 3.80%
Unemployment rate, average % 6.50% 6.20% 6.40%
Severe Pessimistic [Member] | Chile [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (4.10%) (2.40%) (0.50%)
Unemployment rate, average % 10.70% 12.00% 12.00%
Severe Pessimistic [Member] | Chile [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.90% 4.20% 4.20%
Unemployment rate, average % 7.00% 8.80% 8.60%
Severe Pessimistic [Member] | Peru [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (2.70%) (4.50%) 0.00%
Unemployment rate, average % 11.70% 14.10% 13.80%
Severe Pessimistic [Member] | Peru [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 1.10% 4.90% 4.70%
Unemployment rate, average % 12.00% 9.90% 10.00%
Severe Pessimistic [Member] | Colombia [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (0.20%) (2.60%) 0.00%
Unemployment rate, average % 13.60% 16.20% 18.60%
Severe Pessimistic [Member] | Colombia [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 2.90% 5.40% 5.00%
Unemployment rate, average % 13.60% 12.80% 13.70%
Severe Pessimistic [Member] | Caribbean [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change (0.60%) (0.60%) 0.30%
Severe Pessimistic [Member] | Caribbean [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Real GDP growth, y/y % change 3.90% 4.90% 5.60%
Severe Pessimistic [Member] | Global WTI oil price [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / bbl 140 56 57
Severe Pessimistic [Member] | Global WTI oil price [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / bbl 117 59 57
Severe Pessimistic [Member] | Global Copper price [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / lb 4.77 3.82 3.81
Severe Pessimistic [Member] | Global Copper price [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Average price of hedging instrument | $ / lb 4.57 3.56 3.62
Severe Pessimistic [Member] | Global GDP and PPP [member] | Next 12 Months [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Global GDP, PPP-weighted, y/y % change (2.78%) (0.55%) (0.69%)
Severe Pessimistic [Member] | Global GDP and PPP [member] | Remaining forecast period [member]      
Disclosure of Primary Macroeconomic Drivers of Credit Losses [Line Items]      
Global GDP, PPP-weighted, y/y % change 3.76% 4.85% 4.48%