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Capital Management, Corporate Governance Transparency Policy and Risk Management - Summary of Key Economic Variables or Assumptions (Detail) | 12 Months Ended
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Dec. 31, 2021
Base case [member] | Over 12 months and up to 24 months [member] |
Disclosure of external credit grades [line items] |
GDP growth | 2.50%
Interest rates | 44.55%
CPI | 54.04%
Base case [member] | Later than two years and not later than three years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 3.00%
Interest rates | 35.44%
CPI | 38.01%
Base case [member] | Later than three years and not later than four years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 3.00%
Interest rates | 35.44%
CPI | 33.04%
Downside [member] | Over 12 months and up to 24 months [member] |
Disclosure of external credit grades [line items] |
GDP growth | (5.00%)
Interest rates | 65.82%
CPI | 66.84%
Downside [member] | Later than two years and not later than three years [member] |
Disclosure of external credit grades [line items] |
GDP growth | (0.50%)
Interest rates | 58.22%
CPI | 44.99%
Downside [member] | Later than three years and not later than four years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 0.00%
Interest rates | 58.22%
CPI | 40.00%
Favourable [Member] | Over 12 months and up to 24 months [member] |
Disclosure of external credit grades [line items] |
GDP growth | 5.00%
Interest rates | 34.93%
CPI | 32.98%
Favourable [Member] | Later than two years and not later than three years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 5.00%
Interest rates | 29.37%
CPI | 26.02%
Favourable [Member] | Later than three years and not later than four years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 5.00%
Interest rates | 29.37%
CPI | 20.03%
Probability of default [member] | Base case [member] |
Disclosure of external credit grades [line items] |
GDP growth | 50.00%
Interest rates | 50.00%
CPI | 50.00%
Probability of default [member] | Downside [member] |
Disclosure of external credit grades [line items] |
GDP growth | 45.00%
Interest rates | 45.00%
CPI | 45.00%
Probability of default [member] | Favourable [Member] |
Disclosure of external credit grades [line items] |
GDP growth | 5.00%
Interest rates | 5.00%
CPI | 5.00%

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