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Cash and cash equivalents and investment securities (Tables) | 12 Months Ended
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Dec. 31, 2021
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Summary Of Investments In Short term Debt Securities |
Million US dollar |  | 31 December 2021 |  |  | 31 December 2020 |
Investment in unquoted companies |  |  | 139 |  |  |  | 115 |
Investment on debt securities |  |  | 22 |  |  |  | 22 |
Non-current investments |  |  | 161 |  |  |  | 137 |
Investment on debt securities |  |  | 374 |  |  |  | 396 |
Current investments |  |  | 374 |  |  |  | 396 |

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