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Employment costs - Summary of employment costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total employment costs      
– Wages and salaries $ 4,141 $ 3,923 $ 4,154
– Social security costs 330 328 336
– Net post-retirement charge 469 384 532
– Share-based payment charge 138 123 122
Employment costs before utilisation of provisions 5,078 4,758 5,144
Less: charged within provisions (308) (236) (416)
Total employment costs $ 4,770 $ 4,522 $ 4,728