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Financial instruments disclosures - Additional information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings | $ 12,405 | $ 12,653
Expected unconditional guaranteed royalty payments to be received | 155 | 113
Expected unconditional guaranteed royalty payments to be received, unadjusted | $ 56 |
Percentage of change in coal spot price | 15.00% |
Fair value hedges | Currency risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Hedged item, assets | $ 273 | 388
Hedged item, liabilities | 162 | 140
Interest rate swap contract |  |
Disclosure of detailed information about financial instruments [line items] |  |
Nominal value | 1,500 |
Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Bonds, carrying value | 7,400 | 7,600
Bonds, fair value | 9,000 | 9,500
Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings | $ 4,200 | 4,200
Percentage of change in coal spot price | 15.00% |
Increase in carrying value of forward contract due to coal spot price assumptions | $ 149 | 198
Decrease in carrying value of forward contract due to decrease in spot price | (41) | (46)
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 | (92) | 126
Level 3 | Fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings | $ 4,700 | $ 4,700

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