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Loans and asset quality - Nonperforming Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Nonperforming Assets [Line Items]    
With an allowance $ 150 $ 128
Without an allowance 8 49
Total 158 177
With an allowance, Other assets owned 0 0
Without an allowance, Other assets owned 2 2
Other assets owned 2 2
With an allowance, Total nonperforming assets 150 128
Without an allowance, Total nonperforming assets 10 51
Total nonperforming assets 160 179
Commercial real estate    
Nonperforming Assets [Line Items]    
With an allowance 125 104
Without an allowance 0 39
Total 125 143
Other residential mortgages    
Nonperforming Assets [Line Items]    
With an allowance 16 18
Without an allowance 0 1
Total 16 19
Wealth management mortgages    
Nonperforming Assets [Line Items]    
With an allowance 9 6
Without an allowance 8 9
Total $ 17 $ 15