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Financial instruments - Additional information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | $ 11,412 | $ 12,807 | $ 14,027
Provisionally priced receivables | 1,155 | 1,114 |
Expected unconditional guaranteed royalty payments to be received | 146 | 136 |
Expected unconditional guaranteed royalty payments to be received, unadjusted | $ 55 |  |
Percentage of change in coal spot price | 15.00% |  |
Level 3 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of change in coal spot price | 15.00% |  |
Increase in carrying value of forward contract due to coal spot price assumptions | $ 15 | 63 |
Decrease in carrying value of forward contract due to decrease in spot price | (41) | (53) |
Borrowings | 4,100 | 4,200 |
Level 3 | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 0 | 0 |
Borrowings | 4,300 | 4,400 |
Level 3 | Aluminium forward contracts embedded in electricity purchase contracts |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term embedded derivatives at fair value | 178 | 146 |
Level 1 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Bonds, carrying value | 6,700 | 7,300 |
Bonds, fair value | 7,000 | 8,700 |
Level 1 | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | $ 3,916 | $ 4,138 |

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- Definition The amount of cash on hand and demand deposits, along with 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. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_i&doctype=Standard -URIDate 2021-03-24 + Details
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