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Equity (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 SFr / shares
Disclosure of classes of share capital [line items] |  |  |  |
Share capital at beginning of period | $ 901 | $ 913 | $ 936 |
Treasury shares at beginning of period | (48) | (53) | (80) |
Total outstanding share capital at beginning of period | 853 | 860 | 856 |
Share capital movement of period | (11) | (12) | (23) |
Treasury shares movement of period | (44) | 5 | 27 |
Total shares outstanding movement of period | (55) | (7) | 4 |
Share capital at end of period | 890 | 901 | 913 |
Treasury shares at end of period | (92) | (48) | (53) |
Total outstanding share capital at end of period | $ 798 | $ 853 | $ 860 |
Par value per share | SFr / shares |  |  |  | SFr 0.50

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