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Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

		2017			2016
	US$m			US$m
Net book value
At 1 January		951			892
Adjustment on currency translation		86			59
At 31 December		1,037			951
– cost		17,942			17,144
– accumulated impairment		(16,905	)		(16,193	)

At 1 January
– cost		17,144			17,120
– accumulated impairment		(16,193	)		(16,228	)

At 31 December, goodwill has been allocated as follows:
		2017		2016
	US$m		US$m
Net book value
Richards Bay Minerals		552		502
Pilbara		389		360
Dampier Salt		96		89
		1,037		951

Key assumptions calculation of fair value less costs of disposal

The key assumptions to which the calculation of FVLCD for Richards Bay Minerals is most sensitive and the corresponding decrease in FVLCD are set out below:

	US$ million
5% decrease in the titanium slag price	165
1% increase in the discount rate applied to post-tax cash flows	226
10% strengthening of the South African rand	603