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Loans and asset quality - Troubled Debt Restructuring (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
contract
Dec. 31, 2018
USD ($)
contract
Other residential mortgages    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing receivable, modifications, number of contracts | contract 12 17
Financing receivable, troubled debt restructuring, premodification | $ $ 6 $ 4
Outstanding recorded investment post-modification | $ $ 6 $ 4
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | contract 9  
Financing receivable, troubled debt restructuring, subsequent default | $ $ 4  
Wealth management loans and mortgages    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | contract 1