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Financial and capital risk management - Protection program for Libor floating interest rate US denominated debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (197)	$ (34)	$ (324)
Cash flow hedge (Nickel and Palladium)
Derivative financial instruments.
Financial settlement inflows (outflows)	(67)
Value at risk	23
Cash flow hedge (Nickel and Palladium) | 2022.
Derivative financial instruments.
Fair value of liabilities	(26)
EUR fixed rate vs. USD fixed rate swap
Derivative financial instruments.
Receivable	950	950
Payable	$ 950	950
Average receivable rate	0.13%
Average payable rate	0.48%
Fair value of liabilities	$ 11	$ (7)
Financial settlement inflows (outflows)	(1)
Value at risk	2
EUR fixed rate vs. USD fixed rate swap | 2022.
Derivative financial instruments.
Fair value of liabilities	1
EUR fixed rate vs. USD fixed rate swap | 2023.
Derivative financial instruments.
Fair value of liabilities	8
EUR fixed rate vs. USD fixed rate swap | 2022+
Derivative financial instruments.
Fair value of liabilities	$ 2

X

- 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
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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
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+ References

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- Definition

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

+ References

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