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Financial instruments - additional disclosures (Details 4) - Recurring fair value measurement [member] - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Cash and cash equivalents [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value |  | $ 2,010
Cash and cash equivalents [member] | Debt securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value |  | 2,010
Marketable securities, time deposits and derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | $ 213 | 2,846
Marketable securities, time deposits and derivative financial instruments [member] | Debt securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 9 |
Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value |  | 2,741
Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 204 | 105
Financial investments and long-term loans [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 2,070 | 2,704
Financial investments and long-term loans [member] | Fund investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 281 | 366
Financial investments and long-term loans [member] | Available-for-sale financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 1,182 | 1,697
Financial investments and long-term loans [member] | Contingent consideration receivables [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 607 | 641
Associated companies at fair value through profit and loss [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 129 | 192
Contingent consideration receivables [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 43 |
Level 1 of fair value hierarchy [member] | Cash and cash equivalents [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value |  | 2,010
Level 1 of fair value hierarchy [member] | Cash and cash equivalents [member] | Debt securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value |  | 2,010
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value |  | 2,719
Level 1 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value |  | 2,719
Level 1 of fair value hierarchy [member] | Financial investments and long-term loans [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 493 | 1,108
Level 1 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Fund investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 20 | 28
Level 1 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Available-for-sale financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 473 | 1,080
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 213 | 127
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Debt securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 9 |
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Total available-for-sale marketable securities [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value |  | 22
Level 2 of fair value hierarchy [member] | Marketable securities, time deposits and derivative financial instruments [member] | Derivative financial instruments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 204 | 105
Level 2 of fair value hierarchy [member] | Financial investments and long-term loans [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 10 |
Level 2 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Available-for-sale financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 10 |
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 1,567 | 1,596
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Fund investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 261 | 338
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Available-for-sale financial investments [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 699 | 617
Level 3 of fair value hierarchy [member] | Financial investments and long-term loans [member] | Contingent consideration receivables [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 607 | 641
Level 3 of fair value hierarchy [member] | Associated companies at fair value through profit and loss [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | 129 | $ 192
Level 3 of fair value hierarchy [member] | Contingent consideration receivables [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets, at fair value | $ 43 |

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