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Note 7 Probability of default basis points (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Subject to 12 month ECL [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 89.40% 89.90% 91.00%
Subject to 12 month ECL [Member] | 0 to 2 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 5.80% 4.00% 5.50%
Subject to 12 month ECL [Member] | 2 to 5 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 15.70% 10.20% 6.30%
Subject to 12 month ECL [Member] | 5 to 11 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 15.20% 7.70% 14.60%
Subject to 12 month ECL [Member] | 11 to 39 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 18.70% 26.80% 24.50%
Subject to 12 month ECL [Member] | 39 to 194 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 19.10% 24.00% 24.50%
Subject to 12 month ECL [Member] | 194 to 1061 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 12.20% 15.10% 14.00%
Subject to 12 month ECL [Member] | 1061 to 2121 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 1.90% 1.50% 1.40%
Subject to 12 month ECL [Member] | More than 2121 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 0.80% 0.60% 0.40%
Subject to lifetime ECL [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 10.60% 10.10% 9.00%
Subject to lifetime ECL [Member] | 0 to 2 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 0.00% 0.00% 0.00%
Subject to lifetime ECL [Member] | 2 to 5 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 0.10% 0.10% 0.00%
Subject to lifetime ECL [Member] | 5 to 11 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 0.20% 0.10% 0.20%
Subject to lifetime ECL [Member] | 11 to 39 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 0.60% 0.50% 0.80%
Subject to lifetime ECL [Member] | 39 to 194 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 2.50% 2.30% 1.60%
Subject to lifetime ECL [Member] | 194 to 1061 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 3.80% 3.40% 3.60%
Subject to lifetime ECL [Member] | 1061 to 2121 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 1.50% 1.20% 1.20%
Subject to lifetime ECL [Member] | More than 2121 [Member]      
Disclosure of probability of default [Line Items]      
Probability of default in basis points 1.90% 2.50% 1.50%