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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