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Employment costs | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Employee Cost Explanatory [Abstract] |
Disclosure Of Employee Cost Explanatory | 5 Employment costs
|  |  | 2017 |  |  | 2016 |  |  | 2015 |
| Note | US$m |  | US$m |  | US$m |
Total employment costs |  |  |  |  |  |  |  |  |  |
– Wages and salaries |  |  | 4,129 |  |  | 4,235 |  |  | 4,670 |
– Social security costs |  |  | 337 |  |  | 429 |  |  | 430 |
– Net post-retirement charge | 44 |  | 500 |  |  | 522 |  |  | 439 |
– Share option charge | 43 |  | 91 |  |  | 116 |  |  | 128 |
|  |  | 5,057 |  |  | 5,302 |  |  | 5,667 |
Less: charged within provisions (a) | 26 |  | (292 | ) |  | (421 | ) |  | (221 | )
Employment costs | 4 |  | 4,765 |  |  | 4,881 |  |  | 5,446 |
(a) | Amounts included above in respect of provisions for pensions, post-retirement healthcare, long service leave and other employee entitlements which are included in ‘Provisions (including exchange differences on provisions)’ in note 4.

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- Definition Disclosure Of Employee Cost Explanatory [Abstract] + References No definition available. + Details
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