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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, 2020
Base case [member] | Over 12 months and up to 24 months [member] |
Disclosure of external credit grades [line items] |
GDP growth | 5.96%
Central Bank base rates | 37.00%
CPI | 56.98%
Base case [member] | Later than two years and not later than three years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 2.16%
Central Bank base rates | 28.05%
CPI | 39.96%
Base case [member] | Later than three years and not later than four years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 3.04%
Central Bank base rates | 23.44%
CPI | 35.01%
Intermediate [member] | Over 12 months and up to 24 months [member] |
Disclosure of external credit grades [line items] |
GDP growth | 2.66%
Central Bank base rates | 45.00%
CPI | 68.00%
Intermediate [member] | Later than two years and not later than three years [member] |
Disclosure of external credit grades [line items] |
GDP growth | (1.52%)
Central Bank base rates | 35.00%
CPI | 65.00%
Intermediate [member] | Later than three years and not later than four years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 1.04%
Central Bank base rates | 30.00%
CPI | 49.99%
Downside [member] | Over 12 months and up to 24 months [member] |
Disclosure of external credit grades [line items] |
GDP growth | (1.80%)
Central Bank base rates | 80.00%
CPI | 100.03%
Downside [member] | Later than two years and not later than three years [member] |
Disclosure of external credit grades [line items] |
GDP growth | (2.48%)
Central Bank base rates | 100.00%
CPI | 130.01%
Downside [member] | Later than three years and not later than four years [member] |
Disclosure of external credit grades [line items] |
GDP growth | 1.00%
Central Bank base rates | 120.00%
CPI | 150.03%
Probability of default [member] | Base case [member] |
Disclosure of external credit grades [line items] |
GDP growth | 65.00%
Central Bank base rates | 65.00%
CPI | 65.00%
Probability of default [member] | Intermediate [member] |
Disclosure of external credit grades [line items] |
GDP growth | 30.00%
Central Bank base rates | 30.00%
CPI | 30.00%
Probability of default [member] | Downside [member] |
Disclosure of external credit grades [line items] |
GDP growth | 5.00%
Central Bank base rates | 5.00%
CPI | 5.00%

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