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Group statement of changes in equity (Parenthetical) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Share buy back | [1] |  | $ 1
Payments for entity's shares |  | $ 0 | 208
Retained earnings |  |  |
Share buy back | [1] |  | $ 1
[1] | In 2020, the amount of US$1 million together with the amounts paid during the period in respect of an irrevocable contract in place at the beginning of the year to cover the share buy-back programme totalled US$208 million as reported in the cash flow statement.

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- Definition Purchase of entity shares pursuant to share buy back. + References No definition available. + Details
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