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Principal joint ventures - Reconciliation of financial information for joint ventures by carrying value (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of joint ventures [line items]
Net assets/(liabilities)	$ 45,242	$ 49,823
Minera Escondida Limitada [Member]
Disclosure of joint ventures [line items]
Net assets/(liabilities)	8,203	9,343
Group's ownership interest	2,461	2,803
Other adjustments	0	0
Carrying value of Group's interest	2,461	2,803
Sohar Aluminium Co. L.L.C.
Disclosure of joint ventures [line items]
Net assets/(liabilities)	2,285	2,240
Group's ownership interest	457	448
Other adjustments	0	(1)
Carrying value of Group's interest	$ 457	$ 447

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- Definition

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.

+ References

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- Definition

The amount of investments in joint ventures in an entity's separate financial statements. [Refer: Joint ventures [member]]

+ References

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- Definition

The amount of investments in joint ventures accounted for using the equity method. [Refer: Joint ventures [member]; Investments accounted for using equity method]

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- Definition

The amount of assets less the amount of liabilities.

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Other Adjustments to Carrying Amount, Joint Ventures

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