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, 2018 USD ($) $ / T T	Dec. 31, 2017 USD ($) T	Dec. 31, 2016 USD ($)
Derivative financial instruments.
Financial settlement inflows (outflows)	$ (67)	$ (240)	$ (1,602)
Protection programs for base metals raw materials and products
Derivative financial instruments.
Fair value of assets	(10)	$ 24
Financial settlement inflows (outflows)	8
Value at risk	2
Protection programs for base metals raw materials and products \| 2019
Derivative financial instruments.
Fair value of liabilities	(8)
Protection programs for base metals raw materials and products \| 2020+
Derivative financial instruments.
Fair value of liabilities	$ (2)
Nickel forwards - Fixed price sales - Bought
Derivative financial instruments.
Notional amount (ton) \| T	7,244	9,621
Average strike per ton \| $ / T	12,166
Fair value of assets	$ (10)	$ 24
Financial settlement inflows (outflows)	7
Value at risk	2
Nickel forwards - Fixed price sales - Bought \| 2019
Derivative financial instruments.
Fair value of liabilities	(8)
Nickel forwards - Fixed price sales - Bought \| 2020+
Derivative financial instruments.
Fair value of liabilities	$ (2)
Nickel forwards - Raw material purchase - Sold
Derivative financial instruments.
Notional amount (ton) \| T	120	292
Average strike per ton \| $ / T	12,242
Financial settlement inflows (outflows)	$ 1
Copper forwards - Raw material purchase - Sold
Derivative financial instruments.
Notional amount (ton) \| T	81	79
Average strike per ton \| $ / T	6,142