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Financial instruments - additional disclosures (Details 8) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Derivative financial instruments and accrued interest on derivative financial instruments [line items] |  |
Potential outflows in various currencies - from financial derivative liabilities | $ (6,943) | $ (6,786)
Potential inflows in various currencies - from financial derivative assets | 7,062 | 6,820
Not later than one month [member] |  |
Derivative financial instruments and accrued interest on derivative financial instruments [line items] |  |
Potential outflows in various currencies - from financial derivative liabilities | (2,029) | (843)
Potential inflows in various currencies - from financial derivative assets | 2,029 | 847
Later than one month and not later than three months [member] |  |
Derivative financial instruments and accrued interest on derivative financial instruments [line items] |  |
Potential outflows in various currencies - from financial derivative liabilities | (4,598) | (5,482)
Potential inflows in various currencies - from financial derivative assets | 4,712 | 5,516
Later than three month and not later than twelve months [member] |  |
Derivative financial instruments and accrued interest on derivative financial instruments [line items] |  |
Potential outflows in various currencies - from financial derivative liabilities | (316) | (461)
Potential inflows in various currencies - from financial derivative assets | $ 321 | $ 457

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