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Financial risk management and derivative financial instruments - Summary of Covenant Tests Which Are Calculated On a Frozen GAAP Basis (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure Of Detailed Information About Covenant Tests Which Are Calculated On A Frozen GAAP Basis [Line Items] |  |  |
Covenant net debt | $ 1,881 | $ 2,529 | $ 2,665
Frozen GAAP Basis [member] |  |  |
Disclosure Of Detailed Information About Covenant Tests Which Are Calculated On A Frozen GAAP Basis [Line Items] |  |  |
Covenant EBITDA | 601 | 272 | 897
Covenant net debt | 1,801 | 2,375 | 2,241
Covenant interest payable | $ 133 | $ 111 | $ 99
Leverage | 3.00 | 8.73 | 2.50
Interest cover | 4.52 | 2.45 | 9.06
Liquidity | $ 2,655 | $ 2,925 |

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