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Goodwill - Key assumptions calculation of fair value less costs of disposal (Detail) - Richards Bay Minerals - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]
Fair value less costs of disposal, post-tax discount rate	8.60%	8.60%
Five Percentage Decrease In The Titanium Slag Price [Member]
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]
Corresponding decrease in FVLCD	$ 207
One Percentage Increase In The Discount Rate Applied To Posttax Cash Flows [Member]
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]
Corresponding decrease in FVLCD	$ 160
Fair value less costs of disposal, post-tax discount rate	1.00%
Ten Percentage Strengthening Of South African Rand [Member]
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]
Corresponding decrease in FVLCD	$ 380
Strengthening percentage of the South African rand	10.00%
Titanium | Five Percentage Decrease In The Titanium Slag Price [Member]
Disclosure of key assumptions calculation of fair value less costs of disposal [Line Items]
Percentage of decrease in the titanium slag price	5.00%

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- Definition

The discount rate used in the current measurement of fair value less costs of disposal.

+ References

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The higher of an asset’s (or cash-generating unit’s) fair value less costs of disposal and its value in use. [Refer: Cash-generating units [member]]

+ References

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Percentage of decrease in slag price.

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Strengthening percentage of foreign currency.

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