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Financial instruments - additional disclosures (Details 12) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Equity securities | $ 828 | $ 1,195
Fair value of other financial assets sold | 3 | 254
Listed equity securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Equity securities | $ 438 | $ 888
Number of investments in equity instruments designated at fair value through other comprehensive income | 46 | 40
Non-listed equity securities [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Equity securities | $ 390 | $ 307
Number of investments in equity instruments designated at fair value through other comprehensive income | 65 | 60
Alcon |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Fair value of other financial assets sold | $ 22 | $ 9
Alcon | Total fair value adjustments |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gain (loss) on sale of other financial assets | 7 | 1
Others | Total fair value adjustments |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gain (loss) on sale of other financial assets | $ 3 | $ 211

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