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Staff costs and Directors' emoluments - Summary of Staff Costs (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Costs: |  |  |
Wages and salaries | $ 583 | $ 537 | $ 562
Social security costs | 33 | 29 | 33
Pension and other post-retirement benefits: |  |  |
Defined benefit plans (note 25) | 5 | 5 | 5
Defined contribution plans | 24 | 23 | 28
Total staff costs | $ 645 | $ 594 | $ 628

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