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Contributed Equity (Tables) | 12 Months Ended
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Dec. 31, 2022
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Summary of issued and fully paid shares | (a) Issued and fully paid shares
|  | Number of shares |  | US$m
Year ended 31 December 2022 |  |  |  |  |  |  |  |  |  |
Opening balance |  |  |  | 969,631,826 |  |  |  |  | 9,409 |
DRP – ordinary shares issued at US$23.14 (2021 final dividend) 1 |  |  |  | 14,348,997 |  |  |  |  | 332 |
Ordinary shares issued at US$21.06 for the acquisition of BHPP 2 |  |  |  | 914,768,948 |  |  |  |  | 19,265 |
Transaction costs associated to the issue of shares |  |  |  | - |  |  |  |  | (5) |
Amounts as at 31 December 2022 |  |  |  | 1,898,749,771 |  |  |  |  | 29,001 |
Year ended 31 December 2021 |  |  |  |  |  |  |  |  |  |
Opening balance |  |  |  | 962,225,814 |  |  |  |  | 9,297 |
DRP – ordinary shares issued at US$19.03 (2020 final dividend) |  |  |  | 1,354,072 |  |  |  |  | 26 |
DRP – ordinary shares issued at US$14.21 (2021 interim dividend) |  |  |  | 6,051,940 |  |  |  |  | 86 |
Amounts as at 31 December 2021 |  |  |  | 969,631,826 |  |  |  |  | 9,409 |
Year ended 31 December 2020 |  |  |  |  |  |  |  |  |  |
Opening balance |  |  |  | 942,286,900 |  |  |  |  | 9,010 |
DRP - ordinary shares issued at A$25.61 (2019 final dividend) |  |  |  | 12,072,034 |  |  |  |  | 181 |
DRP - ordinary shares issued at A$18.79 (2020 interim dividend) |  |  |  | 6,091,035 |  |  |  |  | 83 |
Employee share plan - ordinary shares issued at A$18.27 (2017 Woodside equity plan) |  |  |  | 1,775,845 |  |  |  |  | 23 |
Amounts as at 31 December 2020 |  |  |  | 962,225,814 |  |  |  |  | 9,297 |
1. | Relates to ordinary shares issued for the DRP as part of the 2021 final dividend. The Group purchased on-market shares for the issuance of DRP as part of the 2022 interim dividend. Refer to Note C.3(b) for details of the on-market purchases and allocation.
2. | 914,768,948 new Woodside shares were issued as consideration for the BHPP merger. Refer to Note B.5 for details.
Summary of information about shares reserved for employee share plans | (b) Reserved shares
|  | Employee share plans |  |  | Dividend reinvestment plan |
|  | Number of shares |  |  | US$m |  |  | Number of shares |  |  | US$m |
Year ended 31 December 2022 |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  | 1,819,744 |  |  | (30) |  |  | - |  |  | - |
Purchases during the year |  | 2,232,589 |  |  | (45) |  |  | 6,823,092 |  |  | (144) |
Vested/allocated during the year |  | (2,178,556) |  |  | 37 |  |  | (6,823,092) |  |  | 144 |
Amounts at 31 December 2022 |  | 1,873,777 |  |  | (38) |  |  | - |  |  | - |
Year ended 31 December 2021 |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  | 1,766,099 |  |  |  | (23) |  |  |  | - |  |  |  | - |
Purchases during the year |  |  | 2,683,469 |  |  |  | (47) |  |  |  | - |  |  |  | - |
Vested during the year |  |  | (2,629,824) |  |  |  | 40 |  |  |  | - |  |  |  | - |
Amounts at 31 December 2021 |  |  | 1,819,744 |  |  |  | (30) |  |  |  | - |  |  |  | - |
Year ended 31 December 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Opening balance |  |  | 1,985,306 |  |  |  | (39) |  |  |  | - |  |  |  | - |
Purchases during the year |  |  | 2,242,345 |  |  |  | (32) |  |  |  | - |  |  |  | - |
Vested during the year |  |  | (2,461,552) |  |  |  | 48 |  |  |  | - |  |  |  | - |
Amounts at 31 December 2020 |  |  | 1,766,099 |  |  |  | (23) |  |  |  | - |  |  |  | - |

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