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Financial assets and liabilities - Changes in Level 3 assets and liabilities - (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Disclosure of detailed information about borrowings [line items] |
Financial assets at beginning of period | $ 92,007
Financial assets at end of period | 96,716
Financial liabilities at beginning of period | 57,186
Financial liabilities at end of period | 54,357
Level 3 |
Disclosure of detailed information about borrowings [line items] |
Financial assets at beginning of period | 18
Gain and losses recognized in income statement | (4)
Translation adjustments | 1
Financial assets at end of period | 15
Financial liabilities at beginning of period | 19
Gain and losses recognized in income statement | (13)
Financial liabilities at end of period | $ 6

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