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Acquisitions and dispositions (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 08, 2019
Jun. 29, 2018
Jan. 02, 2018
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Contingent payments       $ 6  
Potential obligation to pay additional consideration, lower range       5  
Potential obligation to pay additional consideration, upper range       $ 13  
Contingent consideration payment period       2 years  
Goodwill written off         $ 65
Promontory Interfinancial Network          
Business Acquisition [Line Items]          
Gain on disposal $ 622        
CenterSquare          
Business Acquisition [Line Items]          
Assets under management divested     $ 10,000    
Goodwill written off     $ 52    
Amherst Capital Management LLC          
Business Acquisition [Line Items]          
Goodwill written off   $ 13