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Line of Business Information - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
line_of_business
Dec. 31, 2019
Dec. 31, 2019
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]            
Number of lines of business   2   2    
Net costs $ 2,712       $ 3,101 $ 2,995
Acquisition and restructuring costs 77       24 266
Repositioning charges 110       300  
Minimum | Investment Servicing and Management Services | Investment Servicing and Investment Management            
Segment Reporting Information [Line Items]            
Percentage of consolidated revenues by segment     70.00%      
Minimum | Processing and Other Services | Investment Servicing and Investment Management            
Segment Reporting Information [Line Items]            
Percentage of consolidated revenues by segment     20.00%      
Maximum | Investment Servicing and Management Services | Investment Servicing and Investment Management            
Segment Reporting Information [Line Items]            
Percentage of consolidated revenues by segment     80.00%      
Maximum | Processing and Other Services | Investment Servicing and Investment Management            
Segment Reporting Information [Line Items]            
Percentage of consolidated revenues by segment     30.00%      
Other            
Segment Reporting Information [Line Items]            
Net costs (359)       (398) $ (266)
Acquisition and restructuring costs 77       24  
Repositioning charges 110       300  
Legal and related expenses $ 172       50  
Business exit costs         $ 24