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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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 domain members defined in one or many axes of the table.

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The average strike price of commodity per ton.

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

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The nominal amount per ton of a commodity instrument.

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Additional information about derivatives financial instruments - Protection programs for base metals raw materials and products (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / T T	Dec. 31, 2018 USD ($) T	Dec. 31, 2017 USD ($)
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (324)	$ (67)	$ (240)
Protection programs for base metals raw materials and products
Derivative financial instruments.
Fair value of assets		$ (10)
Financial settlement inflows (outflows)	48
Nickel forwards - Fixed price sales - Bought
Derivative financial instruments.
Notional amount (ton) \| T		7,244
Fair value of assets		$ (10)
Financial settlement inflows (outflows)	49
Nickel forwards - Raw material purchase - Sold
Derivative financial instruments.
Notional amount (ton) \| T		120
Financial settlement inflows (outflows)	(1)
Copper forwards - Raw material purchase - Sold
Derivative financial instruments.
Notional amount (ton) \| T		81
Protection programs for base metals raw materials and products - Nickel revenue hedging program
Derivative financial instruments.
Fair value of assets	150
Financial settlement inflows (outflows)	11
Value at risk	24
Protection programs for base metals raw materials and products - Nickel revenue hedging program \| 2021
Derivative financial instruments.
Fair value of liabilities	6
Protection programs for base metals raw materials and products - Nickel revenue hedging program \| 2020
Derivative financial instruments.
Fair value of liabilities	$ 142
Call options - Nickel Revenue Hedging - Sold
Derivative financial instruments.
Notional amount (ton) \| T	75,984
Average strike per ton \| $ / T	18,739
Fair value of assets	$ (12)
Financial settlement inflows (outflows)	(2)
Value at risk	3
Call options - Nickel Revenue Hedging - Sold \| 2021
Derivative financial instruments.
Fair value of liabilities	(3)
Call options - Nickel Revenue Hedging - Sold \| 2020
Derivative financial instruments.
Fair value of liabilities	$ (10)
Put options - Nickel Revenue Hedging - Bought
Derivative financial instruments.
Notional amount (ton) \| T	75,984
Average strike per ton \| $ / T	15,714
Fair value of assets	$ 162
Financial settlement inflows (outflows)	13
Value at risk	21
Put options - Nickel Revenue Hedging - Bought \| 2021
Derivative financial instruments.
Fair value of liabilities	9
Put options - Nickel Revenue Hedging - Bought \| 2020
Derivative financial instruments.
Fair value of liabilities	$ 152