v3.26.1
Fair values of financial instruments not carried at fair value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Deposits by banks    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities $ 91,401 $ 97,952
Deposits by banks | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 56 131
Deposits by banks | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 91,428 97,981
Deposits by banks | Fair value | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 56 131
Customer accounts    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 1,827,703 1,786,828
Customer accounts | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 18,034 16,173
Customer accounts | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 1,827,675 1,787,070
Customer accounts | Fair value | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 18,034 16,173
Repurchase agreements – non-trading    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 276,266 204,974
Repurchase agreements – non-trading | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 276,275 204,966
Debt securities in issue | At cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 105,027 99,675
Debt securities in issue | At cost | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 473 495
Debt securities in issue | Fair value | At cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 106,562 101,020
Debt securities in issue | Fair value | At cost | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 473 495
Subordinated liabilities | At cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 27,872 28,406
Subordinated liabilities | Fair value | At cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 30,908 31,617
Loans and advances to banks    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 110,529 108,462
Loans and advances to banks | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,147 45
Loans and advances to banks | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 110,514 108,452
Loans and advances to banks | Fair value | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,147 45
Loans and advances to customers    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,022,105 988,399
Loans and advances to customers | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 5,828 3,493
Loans and advances to customers | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,013,525 980,792
Loans and advances to customers | Fair value | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 5,828 3,493
Repurchase agreements – non-trading    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 311,871 298,392
Repurchase agreements – non-trading | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 311,734 298,545
Financial investments – at amortised cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 218,320 182,089
Financial investments – at amortised cost | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,729 93
Financial investments – at amortised cost | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 216,213 181,683
Financial investments – at amortised cost | Fair value | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets $ 1,725 $ 93