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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, 2021
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share awards outstanding at 1 Jan (in shares) 103,473 97,055
Additions during the year (in shares) 75,549 72,443
Released in the year (in shares) (63,635) (60,673)
Forfeited in the year (in shares) (6,023) (5,352)
Share awards outstanding at 31 Dec (in shares) 109,364 103,473
Weighted average fair value of awards granted (in dollars per share) | $ / shares $ 6.49 $ 7.28