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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill [Abstract]  
Summary of goodwill

2020
US$m
2019
US$m
Net book value
At 1 January922 912 
Adjustment on currency translation24 10 
At 31 December946 922 
– cost17,341 16,926 
– accumulated impairment(16,395)(16,004)

At 1 January
– cost16,926 15,861 
– accumulated impairment(16,004)(14,949)
At 31 December, goodwill has been allocated as follows:

2020
US$m
2019
US$m
Net book value
Richards Bay Minerals468 487 
Pilbara383 349 
Dampier Salt95 86 

946 922 
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$m
5% decrease in the titanium slag price182 
1% increase in the discount rate applied to post-tax cash flows213 
10% strengthening of the South African rand393