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Fair value measurement of financial assets and liabilities - Summary of financial assets and liabilities, at amortized cost (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost $ 1,518 $ 454
Consumer deposits 13,003 9,510
Level 1    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Total financial assets 1,969 679
Consumer deposits 0 0
Subordinated liabilities 0 0
Total financial liabilities 0 0
Level 1 | Senior unsecured bonds    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 0 0
Level 1 | Commercial papers    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 0 0
Level 2    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Total financial assets 0 0
Consumer deposits 13,188 9,671
Subordinated liabilities 206 175
Total financial liabilities 13,806 9,996
Level 2 | Senior unsecured bonds    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 327 136
Level 2 | Commercial papers    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 84 14
Level 3    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Total financial assets 0 0
Consumer deposits 0 0
Subordinated liabilities 0 0
Total financial liabilities 0 0
Level 3 | Senior unsecured bonds    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 0 0
Level 3 | Commercial papers    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 0 0
Carrying Amount    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Total financial assets 1,968 684
Consumer deposits 13,003 9,510
Subordinated liabilities 184 171
Total financial liabilities 13,597 9,830
Carrying Amount | Senior unsecured bonds    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 326 136
Carrying Amount | Commercial papers    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 84 13
Balance at Fair Value    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Total financial assets 1,969 679
Consumer deposits 13,188 9,671
Subordinated liabilities 206 175
Total financial liabilities 13,805 9,996
Balance at Fair Value | Senior unsecured bonds    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 327 136
Balance at Fair Value | Commercial papers    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments issued at amortised cost 84 14
Treasury bills chargeable at central banks | Level 1    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 1,909 668
Treasury bills chargeable at central banks | Level 2    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 0 0
Treasury bills chargeable at central banks | Level 3    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 0 0
Treasury bills chargeable at central banks | Carrying Amount    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 1,908 673
Treasury bills chargeable at central banks | Balance at Fair Value    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 1,909 668
Bonds and other interest bearing securities | Level 1    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 60 11
Bonds and other interest bearing securities | Level 2    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 0 0
Bonds and other interest bearing securities | Level 3    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 0 0
Bonds and other interest bearing securities | Carrying Amount    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost 60 11
Bonds and other interest bearing securities | Balance at Fair Value    
Disclosure Of Fair Values Of Financial Instruments Carried At Amortised Cost [Line Items]    
Debt instruments held at amortised cost $ 60 $ 11