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Financial risk management and derivative financial instruments - Summary of Amended Covenant Test Levels For Syndicated and Bilateral Facilities (Detail) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2019 | Dec. 31, 2021 USD ($)
Amended Covenant Test Levels For Syndicated And Bilateral Facilities [Line Items] |  |  |  |  |
Liquidity |  | $ 400 | $ 400 |  | $ 400
Minimum [Member] |  |  |  |  |
Amended Covenant Test Levels For Syndicated And Bilateral Facilities [Line Items] |  |  |  |  |
Interest cover | 3.5 | 2.0 | 1.5 | 3.5 |
Maximum [Member] |  |  |  |  |
Amended Covenant Test Levels For Syndicated And Bilateral Facilities [Line Items] |  |  |  |  |
Leverage | 3.5 | 6.5 | 7.5 | 3.5 |

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- Definition Covenant liquidity. + References No definition available. + Details
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