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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill [Abstract]  
Summary of goodwill

2019
US$m

2018
US$m

Net book value
 
 
At 1 January
912

1,037

Adjustment on currency translation
10

(125
)
At 31 December
922

912

– cost
16,926

15,861

– accumulated impairment
(16,004
)
(14,949
)

 
 
At 1 January
 
 
– cost
15,861

17,942

– accumulated impairment
(14,949
)
(16,905
)
At 31 December, goodwill has been allocated as follows:

2019
US$m

2018
US$m

Net book value
 
 
Richards Bay Minerals
487

474

Pilbara
349

351

Dampier Salt
86

87


922

912
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
230

1% increase in the discount rate applied to post-tax cash flows
237

10% strengthening of the South African rand
762