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Loans and asset quality - Impaired Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment $ 39 $ 1 $ 4
Total impaired loans, average recorded investment (less than) 50 5 7
Impaired loans with an allowance, recorded investment 0 0 0
Total impaired loans, interest income recognized 0 0 0
Total impaired loans, recorded investment 15 4  
Total impaired loans, unpaid Principal balance 15 4  
Impaired loans with an allowance, related allowance (less than) 0 0  
Commercial      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 39 0 0
Impaired loans with an allowance, recorded investment 0 0 0
Financial institutions      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 0 0 1
Impaired loans with an allowance, recorded investment 0 0 0
Wealth management loans and mortgages      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 0 1 2
Impaired loans without an allowance, average recorded investmen 11 4 3
Impaired loans with an allowance, recorded investment 0 0 0
Impaired loans without an allowance, recorded investment 0 0 0
Impaired loans without an allowance, recorded investment 15 4  
Impaired loans without an allowance, unpaid Principal balance 15 4  
Lease financings      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, average recorded investment 0 0 1
Impaired loans with an allowance, recorded investment 0 0 $ 0
Loans Individually Less Than One Million      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, recorded investment 1 1  
Impaired loans with an allowance, related allowance (less than) 1 1  
Maximum | Loans Individually Less Than One Million      
Financing Receivable, Impaired [Line Items]      
Impaired loans with an allowance, recorded investment $ 1 $ 1