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Financial instruments disclosures - Additional information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings | $ 12,604 |  | $ 12,806
Expected unconditional guaranteed royalty payments to be received | $ 111 | $ 124 |
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 | $ 444 |  | 151
Hedged item, liabilities | 281 |  | 298
Interest rate swap contract |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Notional amount | 1,500 |  |
Level 1 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Bonds, carrying value | 7,500 |  | 7,700
Bonds, fair value | 9,200 |  | 9,100
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 | $ 177 |  | 214
Decrease in carrying value of forward contract due to decrease in spot price | 44 |  | 57
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 | 326 |  | 120
Level 3 | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings | $ 4,700 |  | $ 4,700

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