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Financial assets and liabilities - Changes in Level 3 assets and liabilities - (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [line items] |
Financial assets at beginning of period | $ 91,713
Financial assets at end of period | 92,007
Financial liabilities at beginning of period | 52,720
Financial liabilities at end of period | 57,186
Level 3 |
Disclosure of detailed information about borrowings [line items] |
Financial assets at beginning of period | 24
Translation adjustments | (6)
Financial assets at end of period | 18
Financial liabilities at beginning of period | 120
Gain and losses recognized in income statement | (79)
Settlements, fair value measurement, liabilities | (22)
Financial liabilities at end of period | $ 19

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