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Line of Business Information - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2023
line_of_business
Dec. 31, 2023
USD ($)
Dec. 31, 2023
reporting_segment
Dec. 31, 2023
Dec. 31, 2023
reportable_segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
reportable_segment
Segment Reporting Information [Line Items]                
Number of lines of business   2   2   2   2
Restructuring charges     $ 203       $ 78  
Cash settled deferred incentive compensation awards, accelerated expense     147          
Other                
Segment Reporting Information [Line Items]                
FDIC special assessment $ 387   387       0 $ 0
Other Income     294       0 (111)
Restructuring charges     203       70 (3)
Cash settled deferred incentive compensation awards, accelerated expense     $ 0       $ 0 $ 147
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%