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Financial risk management and derivative financial instruments - Disclosure of Short-term Deposits by Counterparty Credit Rating (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of credit risk exposure [line items] |  |
Short-term deposits | $ 358 |
Money market funds | 892 | $ 35
Repurchase agreement collateral | 321 |
AAA credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Money market funds | 892 |
Repurchase agreement collateral | 238 |
AA credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Repurchase agreement collateral | 65 |
AA minus Credit Rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Short-term deposits | 98 |
Repurchase agreement collateral | 18 |
A plus credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Short-term deposits | 165 |
A credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Short-term deposits | 94 |
A minus credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Short-term deposits | $ 1 |

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- Definition The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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