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The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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Business disposals (Details) $ in Millions	12 Months Ended
Business disposals (Details) $ in Millions	Dec. 31, 2021 USD ($) branch	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disclosure of detailed information about business combination [line items]
Goodwill impairment	$ 587	$ 41	$ 7,349
Liabilities of disposal groups held for sale	9,005	$ 0
Customer accounts
Disclosure of detailed information about business combination [line items]
Liabilities of disposal groups held for sale	$ 8,800
HSBC SFH (France)
Disclosure of detailed information about business combination [line items]
Proportion of ownership interest in subsidiary	100.00%
Potential sale of the retail banking business in France \| HSBC Continental Europe
Disclosure of detailed information about business combination [line items]
Tax deduction for loss provision	$ 400
Non-current assets or disposal groups classified as held for sale	27,400
Potential sale of the retail banking business in France \| HSBC Continental Europe \| Forecast
Disclosure of detailed information about business combination [line items]
Loss from discontinued operations	2,300
Goodwill impairment	700
Potential sale of the retail banking business in France \| HSBC Continental Europe \| Customer accounts
Disclosure of detailed information about business combination [line items]
Liabilities of disposal groups held for sale	22,600
Potential sale of the retail banking business in France \| HSBC Continental Europe \| Loans and advances to customers
Disclosure of detailed information about business combination [line items]
Non-current assets or disposal groups classified as held for sale	$ 24,900
Potential sale of the retail banking business in France \| HSBC SFH (France) \| HSBC Continental Europe
Disclosure of detailed information about business combination [line items]
Proportion of ownership interest in subsidiary	100.00%
Potential sale of the retail banking business in France \| Crédit Logement \| HSBC Continental Europe
Disclosure of detailed information about business combination [line items]
Proportion of ownership interest in subsidiary	3.00%
US retail banking business restructure \| Minimum \| Retail
Disclosure of detailed information about business combination [line items]
Number of branches \| branch	20
US retail banking business restructure \| Maximum \| Retail
Disclosure of detailed information about business combination [line items]
Number of branches \| branch	25
Number of branches held for sale \| branch	90
US retail banking business restructure \| Customer accounts \| Retail
Disclosure of detailed information about business combination [line items]
Liabilities of disposal groups held for sale	$ 8,800
US retail banking business restructure \| Loans and advances to customers \| Retail
Disclosure of detailed information about business combination [line items]
Non-current assets or disposal groups classified as held for sale	$ 2,400