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Contributed Equity - Summary of Issued and Fully Paid Shares (Parenthetical) (Detail) - Ordinary shares [member] | 12 Months Ended |  |
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Dec. 31, 2022 $ / shares shares | Dec. 31, 2022 $ / shares shares | Dec. 31, 2021 shares | Dec. 31, 2020 shares
BHP Petroleum International Pty Ltd [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Share price | $ 21.06 |  |  |
Number of shares issued | shares | 914,768,948 | 914,768,948 |  |
2021 interim dividend [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Share price | $ 14.21 |  |  |
2020 interim dividend [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Share price |  | $ 18.79 |  |
2021 dividend [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Share price | $ 23.14 |  |  |
Number of shares issued | shares | 14,348,997 | 14,348,997 | 6,051,940 |
2020 dividend [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Share price | $ 19.03 |  |  |
Number of shares issued | shares |  |  | 1,354,072 | 6,091,035
2019 dividend [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Share price |  | $ 25.61 |  |
Number of shares issued | shares |  |  |  | 12,072,034
2017 Woodside equity plan [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Share price |  | $ 18.27 |  |
Number of shares issued | shares |  |  |  | 1,775,845

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