Line of Business Information - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 line_of_business	Dec. 31, 2022 USD ($)	Dec. 31, 2022 reporting_segment	Dec. 31, 2022	Dec. 31, 2022 reportable_segment	Dec. 31, 2021 USD ($) reportable_segment	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of lines of business	2		2		2	2
Cash settled deferred incentive compensation awards, accelerated expense		$ 147
Other
Segment Reporting Information [Line Items]
Cash settled deferred incentive compensation awards, accelerated expense		$ 0				$ 147	$ 0
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%