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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill [Abstract] |
Summary of goodwill |
|  | 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

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- Definition The disclosure of the reconciliation of changes in goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2016-01-13 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2016-03-30&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2016-03-31 + Details
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