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Employee compensation and benefits - Movement on HSBC share awards (Details) - Restricted share awards
shares in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share awards outstanding at 1 Jan 123,166 118,665
Additions during the year 62,044 94,981
Released in the year (76,051) (76,552)
Forfeited in the year (4,634) (13,928)
Share awards outstanding at 31 Dec 104,525 123,166
Weighted average fair value of awards granted (in dollars per share) | $ $ 7.09 $ 7.25