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Financial risk - Bank’s liquid assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of financial assets [line items] |  |
Liquid assets | $ 1,404 | $ 1,048
Cash and due from banks |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 1,211 | 846
FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 194 | 202
Total |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 1,405 | 1,048
United State of America | Cash and due from banks |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 1,203 | 690
United State of America | FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 89 | 90
United State of America | Total |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 1,292 | 780
Other O.E.C.D countries | Cash and due from banks |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 0 | 100
Other O.E.C.D countries | FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 0 | 0
Other O.E.C.D countries | Total |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 0 | 100
Latin America | Cash and due from banks |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 8 | 6
Latin America | FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 0 | 0
Latin America | Total |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 8 | 6
Other countries | Cash and due from banks |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 0 | 0
Other countries | FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 0 | 0
Other countries | Total |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 0 | 0
Multilateral | Cash and due from banks |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 0 | 50
Multilateral | FVOCI |  |
Disclosure of financial assets [line items] |  |
Liquid assets | 105 | 112
Multilateral | Total |  |
Disclosure of financial assets [line items] |  |
Liquid assets | $ 105 | $ 162

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