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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, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share awards outstanding at 1 Jan 104,525 123,166
Additions during the year 61,569 62,044
Released in the year (67,899) (76,051)
Forfeited in the year (3,298) (4,634)
Share awards outstanding at 31 Dec 94,897 104,525
Weighted average fair value of awards granted (in dollars per share) | $ $ 7.66 $ 7.09