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Employment costs (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Employee Cost Explanatory [Abstract] |
Summary of employment costs |
|  |  | 2018 |  |  | 2017 |  |  | 2016 |
| Note | US$m |  | US$m |  | US$m |
Total employment costs |  |  |  |  |  |  |  |  |  |
– Wages and salaries |  |  | 4,154 |  |  | 4,129 |  |  | 4,235 |
– Social security costs |  |  | 336 |  |  | 337 |  |  | 429 |
– Net post-retirement charge | 44 |  | 532 |  |  | 500 |  |  | 522 |
– Share-based payment charge | 43 |  | 122 |  |  | 91 |  |  | 116 |
|  |  | 5,144 |  |  | 5,057 |  |  | 5,302 |
Less: charged within provisions (a) | 26 |  | (416 | ) |  | (292 | ) |  | (421 | )
Total employment costs | 4 |  | 4,728 |  |  | 4,765 |  |  | 4,881 |
(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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