v3.25.2
Fair values of financial instruments not carried at fair value - Fair value of financial instruments not carried at fair value and bases of valuation (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Deposits by banks    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities $ 97,782 $ 73,997
Deposits by banks | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 103 0
Deposits by banks | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 97,812 74,025
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 103 0
Customer accounts    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 1,718,604 1,654,955
Customer accounts | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 19,088 5,399
Customer accounts | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 1,718,745 1,655,151
Customer accounts | Fair value | Disposal groups classified as held for sale    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 19,088 5,399
Repurchase agreements – non-trading    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 195,532 180,880
Repurchase agreements – non-trading | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 195,498 180,873
Debt securities in issue | At cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 102,129 105,785
Debt securities in issue | Fair value | At cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 102,898 106,643
Subordinated liabilities | At cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 27,569 25,958
Subordinated liabilities | Fair value | At cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 30,114 28,262
Loans and advances to banks    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 107,582 102,039
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 169 144
Loans and advances to banks | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 107,585 102,055
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 169 144
Loans and advances to customers    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 981,722 930,658
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 2,287 977
Loans and advances to customers | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 975,671 917,643
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 2,289 977
Repurchase agreements – non-trading    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 283,204 252,549
Repurchase agreements – non-trading | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 283,340 252,598
Financial investments – at amortised cost    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 166,209 153,973
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 0 0
Financial investments – at amortised cost | Fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 165,142 151,060
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 $ 0 $ 0