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Financial and capital risk management - Embedded derivatives in contracts (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) item EquityInstruments | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) item EquityInstruments | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) EquityInstruments
Derivative financial instruments. |  |  |  |  |
Financial settlement inflows (outflows) | $ 60 | $ (114) | $ (139) | $ 159 |
Embedded Derivatives - Put Options - Sold |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional | EquityInstruments | 1,105,070,863 |  | 1,105,070,863 |  | 1,105,070,863
Average strike rate per share | item | 4.38 |  | 4.38 |  |
Fair value of liabilities | $ (5) |  | $ (5) |  | $ (19)
Value at risk | 2 |  | 2 |  |
Embedded Derivatives - Put Options - Sold | 2021+ |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ (5) |  | $ (5) |  |
Embedded Derivatives - Call Options - Bought |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional | EquityInstruments | 137,751,623 |  | 137,751,623 |  | 137,751,623
Average strike rate per share | item | 3.02 |  | 3.02 |  |
Fair value of liabilities | $ 15 |  | $ 15 |  | $ 18
Value at risk | 2 |  | 2 |  |
Embedded Derivatives - Call Options - Bought | 2021+ |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ 15 |  | $ 15 |  |
Hedge Program for Finished Products Nickel Forwards Sold |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional | EquityInstruments | 604 |  | 604 |  |
Average strike rate per share | item | 18,147 |  | 18,147 |  |
Embedded - Nickel forwards - Bought |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional | EquityInstruments | 626 |  | 626 |  |
Average strike rate per share | item | 16,341 |  | 16,341 |  |
Fair value of liabilities | $ 1 |  | $ 1 |  |
Financial settlement inflows (outflows) |  |  | 1 |  |
Embedded - Nickel forwards - Bought | 2021+ |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ 1 |  | $ 1 |  |
Embedded derivatives - Nickel forwards |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional | EquityInstruments | 3,436 |  | 3,436 |  | 1,979
Average strike rate per share | item | 17,120 |  | 17,120 |  |
Fair value of liabilities | $ (3) |  | $ (3) |  | $ 2
Value at risk | 2 |  | 2 |  |
Embedded derivatives - Nickel forwards | 2021+ |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ (3) |  | $ (3) |  |
Embedded derivatives - Copper forwards |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional | EquityInstruments | 1,247 |  | 1,247 |  | 976
Average strike rate per share | item | 9,620 |  | 9,620 |  |
Embedded derivatives - natural gas call options |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Notional | EquityInstruments | 729,571 |  | 729,571 |  | 746,667
Average strike rate per share | item | 233 |  | 233 |  |
Fair value of liabilities | $ (4) |  | $ (4) |  |
Value at risk | 3 |  | 3 |  |
Embedded derivatives - natural gas call options | 2021+ |  |  |  |  |
Derivative financial instruments. |  |  |  |  |
Fair value of liabilities | $ (4) |  | $ (4) |  |

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + 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 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 nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 23B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 41 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_41&doctype=Standard -URIDate 2020-01-01 + Details
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