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Equity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of classes of share capital [line items] |  |  |
Share capital at beginning of period | $ 936 | $ 944 | $ 969
Treasury shares at beginning of period | (80) | (69) | (100)
Total outstanding share capital at beginning of period | 856 | 875 | 869
Share capital movement of period | (23) | (8) | (25)
Treasury shares movement of period | 27 | (11) | 31
Total shares outstanding movement of period | 4 | (19) | 6
Share capital at end of period | 913 | 936 | 944
Treasury shares at end of period | (53) | (80) | (69)
Total outstanding share capital at end of period | $ 860 | $ 856 | $ 875

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