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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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

+ References

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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.

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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
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Nominal or face amount used to calculate payments on the derivative asset.

+ References

No definition available.

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Nominal or face amount used to calculate payments on the derivative liability.

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- Definition

Average payable interest rate relating to interest rate derivatives.

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No definition available.

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- Definition

Average receivable interest rate relating to interest rate derivatives.

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- Definition

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

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Financial and capital risk management - Protection program for Libor floating interest rate US$ denominated debt (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 USD ($)
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (34)	$ (324)	$ (67)
Call options - Nickel Revenue Hedging - Bought
Derivative financial instruments.
Fair value of assets		(12)			$ (46)
Value at risk					10
Call options - Nickel Revenue Hedging - Bought \| 2021
Derivative financial instruments.
Fair value of liabilities					(46)
Put options - Nickel Revenue Hedging - Bought
Derivative financial instruments.
Fair value of assets		162			28
Financial settlement inflows (outflows)	292
Value at risk					6
Put options - Nickel Revenue Hedging - Bought \| 2021
Derivative financial instruments.
Fair value of liabilities					28
Cash flow hedge (Nickel and Palladium)
Derivative financial instruments.
Fair value of assets		$ 150			(18)
Financial settlement inflows (outflows)	$ 292
Value at risk					16
Cash flow hedge (Nickel and Palladium) \| 2021
Derivative financial instruments.
Fair value of liabilities					(18)
EUR fixed rate vs. US$ fixed rate swap
Derivative financial instruments.
Receivable \| €				€ 950
Payable					$ 950
Average receivable rate				0.13%	0.13%
Average payable rate				0.48%	0.48%
Fair value of liabilities					$ (7)
Value at risk					1
EUR fixed rate vs. US$ fixed rate swap \| 2021
Derivative financial instruments.
Fair value of liabilities					(1)
EUR fixed rate vs. US$ fixed rate swap \| 2023+
Derivative financial instruments.
Fair value of liabilities					(4)
EUR fixed rate vs. US$ fixed rate swap \| 2022
Derivative financial instruments.
Fair value of liabilities					$ (1)