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Risks Arising from Financial Instruments - Summary of Carrying Amount of Financial Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of credit risk exposure [line items] |  |
Gross | $ 31,236 | $ 13,807
Debt Securities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 123 | 117
Trade receivables [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 3,465 | 4,046
Cash Deposits for Guarantees [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 170 | 219
Loans to customers [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 135 | 177
Other receivables [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 1,391 | 1,563
Derivatives [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 842 | 362
Cash and Cash Equivalent [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 25,018 | 7,238
Equity instruments [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 92 | 85
Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 31,601 | 14,090
Gross carrying amount [member] | Debt Securities [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 123 | 117
Gross carrying amount [member] | Trade receivables [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 3,730 | 4,219
Gross carrying amount [member] | Cash Deposits for Guarantees [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 170 | 219
Gross carrying amount [member] | Loans to customers [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 135 | 177
Gross carrying amount [member] | Other receivables [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 1,484 | 1,666
Gross carrying amount [member] | Derivatives [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 842 | 362
Gross carrying amount [member] | Cash and Cash Equivalent [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 25,018 | 7,238
Gross carrying amount [member] | Equity instruments [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | 99 | 92
Impairment losses [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | (365) | (283)
Impairment losses [member] | Trade receivables [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | (265) | (173)
Impairment losses [member] | Other receivables [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | (93) | (103)
Impairment losses [member] | Equity instruments [member] |  |
Disclosure of credit risk exposure [line items] |  |
Gross | $ (7) | $ (7)

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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 that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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