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Risk management and management of capital - Undiscounted funding obligations (Details) - Liquidity risk - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Undiscounted Funding Obligations [Line Items] |  |
Consumer deposits | $ 13,337 | $ 9,790
Notes payable and other borrowings | 1,565 | 698
Lease liabilities | 85 | 93
Total | 14,987 | 10,581
Not later than one year |  |
Undiscounted Funding Obligations [Line Items] |  |
Consumer deposits | 11,043 | 7,681
Notes payable and other borrowings | 450 | 234
Lease liabilities | 26 | 23
Total | 11,518 | 7,938
1-5 years |  |
Undiscounted Funding Obligations [Line Items] |  |
Consumer deposits | 2,294 | 2,109
Notes payable and other borrowings | 876 | 219
Lease liabilities | 54 | 61
Total | 3,224 | 2,389
>5 years |  |
Undiscounted Funding Obligations [Line Items] |  |
Consumer deposits | 0 | 0
Notes payable and other borrowings | 240 | 245
Lease liabilities | 5 | 9
Total | $ 245 | $ 254

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