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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
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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

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