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Business disposals (Details) $ in Millions	6 Months Ended
Business disposals (Details) $ in Millions	Jun. 30, 2021 USD ($) branch	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)
Disclosure of detailed information about business combination [line items]
Goodwill impairment	$ 0	$ 0	$ 41
Potential sale of the retail banking business in France
Disclosure of detailed information about business combination [line items]
Profit (loss) from discontinued operations	2,300
Goodwill impairment	700
Non-current assets or disposal groups classified as held for sale	28,200
Potential sale of the retail banking business in France \| Customer accounts
Disclosure of detailed information about business combination [line items]
Liabilities included in disposal groups classified as held for sale	23,500
Potential sale of the retail banking business in France \| 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	$ 25,600
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 included in disposal groups classified as held for sale	$ 9,900
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	$ 2,600