The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon.

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The average strike rate per share.

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The amount of cash inflow (outflow) from settlement of derivatives.

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Financial and capital risk management - Embedded derivatives in contracts (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) R$ / shares EquityInstruments item T	Dec. 31, 2020 USD ($) EquityInstruments T	Dec. 31, 2019 USD ($)
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (197)	$ (34)	$ (324)
Call Option -SPE - Brought
Derivative financial instruments.
Notional \| EquityInstruments	137,751,623	137,751,623
Average strike rate per share \| item	3.12
Fair value of liabilities	$ 13	$ 18
Value at risk	2
Call Option -SPE - Brought \| 2022+.
Derivative financial instruments.
Fair value of liabilities	$ 13
Embedded derivatives - Nickel forwards
Derivative financial instruments.
Notional \| T	4,269	1,497
Average strike rate per share \| item	19,817
Fair value of liabilities	$ (1)	$ 2
Value at risk	2
Embedded derivatives - Nickel forwards \| 2022+.
Derivative financial instruments.
Fair value of liabilities	$ (1)
Embedded derivatives - Copper forwards
Derivative financial instruments.
Notional \| T	1,603	1,009
Average strike rate per share \| item	9,571
Minimum return guarantee on part of the stake in an associate sold to investment fund - Put options - sold
Derivative financial instruments.
Fair value of liabilities		$ (19)
Fixed price sales protection (ton) - Nickel forwards - Bought
Derivative financial instruments.
Notional \| T	342
Average strike rate per share \| item	16,284
Fair value of liabilities	$ 1
Financial settlement inflows (outflows)	2
Fixed price sales protection (ton) - Nickel forwards - Bought \| 2022+.
Derivative financial instruments.
Fair value of liabilities	$ 1
Hedge program for products acquisition for resale (tons) - Nickel forwards - sold
Derivative financial instruments.
Notional \| EquityInstruments	1,206
Average strike rate per share \| R$ / shares	20,055
Fair value of liabilities	$ (1)
Financial settlement inflows (outflows)	1
Value at risk	1
Hedge program for products acquisition for resale (tons) - Nickel forwards - sold \| 2022+.
Derivative financial instruments.
Fair value of liabilities	$ (1)
Embedded - Call options - sold
Derivative financial instruments.
Notional \| EquityInstruments	729,571	746,667
Average strike rate per share \| item	233
Fair value of liabilities	$ (1)
Financial settlement inflows (outflows)	3
Value at risk	1
Embedded - Call options - sold \| 2022+.
Derivative financial instruments.
Fair value of liabilities	(1)
EUR fixed rate vs. US$ fixed rate swap
Derivative financial instruments.
Fair value of liabilities		$ (1)
Financial settlement inflows (outflows)	$ (29)