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Employee compensation and benefits - Movement on HSBC share awards (Details) - Conditional share awards
shares in Thousands
12 Months Ended
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2023
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Conditional share awards outstanding at 1 Jan (in shares) 125,023 126,246
Additions during the year (in shares) 84,930 72,289
Released in the year (in shares) (71,849) (70,054)
Forfeited in the year (in shares) (4,461) (3,458)
Conditional share awards outstanding at 31 Dec (in shares) 133,643 125,023
Weighted average fair value of awards granted (in dollars per share) | $ / shares $ 6.08 $ 5.84