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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2021
Goodwill [Abstract]  
Summary of goodwill

2021
US$m
2020
US$m
Net book value
At 1 January946 922 
Adjustment on currency translation(67)24 
At 31 December879 946 
– cost16,987 17,341 
– accumulated impairment(16,108)(16,395)

At 1 January
– cost17,341 16,926 
– accumulated impairment(16,395)(16,004)
At 31 December, goodwill has been allocated as follows:
2021
US$m
2020
US$m
Net book value
Richards Bay Minerals428 468 
Pilbara362 383 
Dampier Salt89 95 

879 946 
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 price
207 
1% increase in the discount rate applied to post-tax cash flows
160 
10% strengthening of the South African rand
380