v3.25.4
Fair values of financial instruments not carried at fair value - Fair values of financial instruments not carried at fair value on the balance sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 3,117,161 $ 2,923,319
Financial liabilities 2,882,187 2,682,252
Debt securities in issue    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 216,217 205,564
HSBC Holdings    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 133,493 119,683
Financial liabilities 153,859 138,096
HSBC Holdings | Debt securities in issue    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 113,711 97,588
HSBC Holdings | Subordinated liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 34,334 31,862
HSBC Holdings | Loans and advances to HSBC undertakings    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 40,500 37,677
HSBC Holdings | Debt securities in issue    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 15,470 10,328
HSBC Holdings | Fair value | Loans and advances to HSBC undertakings    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 41,288 38,359
HSBC Holdings | Fair value | Debt securities in issue    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 15,470 10,335
At cost | Debt securities in issue    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 99,675 105,785
At cost | Subordinated liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 27,467 25,080
At cost | Fair value | Debt securities in issue    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 101,020 106,643
At cost | HSBC Holdings | Debt securities in issue    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 69,024 64,320
At cost | HSBC Holdings | Subordinated liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 26,114 23,548
At cost | HSBC Holdings | Fair value | Debt securities in issue    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 70,533 65,123
At cost | HSBC Holdings | Fair value | Subordinated liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities $ 29,073 $ 25,911