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Line of Business Information - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]      
Number of lines of business | segment 2    
Net costs $ 2,999 $ 2,899 $ 2,120
Acquisition and restructuring costs 24 266 209
Other      
Segment Reporting Information [Line Items]      
Net costs (398) (266) (199)
Repositioning charges 300    
Business exit costs 24    
Legal and related expenses 50    
Acquisition and restructuring costs $ 24 $ 266 209
Severance costs     $ (10)
Investment Servicing and Management Services | Investment Servicing and Investment Management | Minimum      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues by segment 75.00%    
Investment Servicing and Management Services | Investment Servicing and Investment Management | Maximum      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues by segment 80.00%    
Processing and Other Services | Investment Servicing and Investment Management | Minimum      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues by segment 20.00%    
Processing and Other Services | Investment Servicing and Investment Management | Maximum      
Segment Reporting Information [Line Items]      
Percentage of consolidated revenues by segment 25.00%