Investments in subsidiaries - Sensitivity of VIU to changes to current assumptions to reduce headroom to nil (Details) - HSBC North America Holdings Inc. $ in Millions, £ in Billions |
Dec. 31, 2025
USD ($)
|
Dec. 31, 2025
GBP (£)
|
Dec. 31, 2024
USD ($)
|
Dec. 31, 2024
GBP (£)
|
|---|---|---|---|---|
| Disclosure of subsidiaries [line items] | ||||
| Recoverable amount | $ 16,016 | £ 16.0 | $ 13,264 | £ 13.3 |
| 100bps decrease in the discount rate - single variable | ||||
| Disclosure of subsidiaries [line items] | ||||
| Impact on VIU | 1.8 | 1.5 | ||
| 10% decrease in forecast profitability - single variable | ||||
| Disclosure of subsidiaries [line items] | ||||
| Impact on VIU | £ (1.6) | £ (1.3) |