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Loans and asset quality - Loan Modifications (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans modified (in loans) | loan     8,000,000
Aggregate recorded investment     $ 13
Financing receivable, modifications, CARES Act   $ 23  
Unpaid principal balance $ 74   $ 74
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans modified (in loans) | loan 2    
Aggregate recorded investment $ 1